Battery protection chip, battery assembly and electronic cigarette

Abstract

The embodiment of the present application provides a battery protection chip, which comprises a power supply pin, a second ground pin, a second switch control pin, an over-discharge voltage protection unit, a discharge over-current protection unit and a logic control unit; the battery protection chip further comprises a secondary over-charge protection unit and a heating detection pin, the secondary over-charge protection unit is electrically connected with the heating detection pin and the logic control unit respectively, the heating detection pin is used for being electrically connected with a connection point of a first switch unit and a heating element or the heating detection pin is used for being electrically connected with a control end of the first switch unit, when the secondary over-charge protection unit judges that a voltage of the heating detection pin is greater than a third preset reference voltage or less than a fourth preset reference voltage, the logic control unit starts timing, and when a time length of the logic control unit is greater than or equal to a second preset time length, the logic control unit controls the second switch unit to remain disconnected. The embodiment of the present application further provides a battery assembly and an electronic cigarette.

Description

Technical Field

[0001] This application relates to the field of electronic cigarette technology, and in particular to a battery protection chip, a battery component, and an electronic cigarette. Background Technology

[0002] Existing electronic cigarettes include batteries and atomizing components. See also... Figure 1 The atomizing component is electrically connected to the battery, which provides electrical energy to the atomizing component. The atomizing component generally includes a system control module, an atomizing coil, a first switching unit 910, and an airflow sensor 940. The system control module is electrically connected to the battery via the battery terminal BAT1 and the ground terminal GND1. The atomizing coil includes a heating wire 950, which is electrically connected to the battery via the first switching unit 910. The first switching unit 910 and the airflow sensor 940 are electrically connected to the system control module. The heating wire 950 is used to heat the e-liquid to atomize and produce smoke. The airflow sensor 940 is used to detect whether there is airflow, such as when a user smokes, it will cause airflow inside the e-cigarette.

[0003] When the system control module detects airflow through the airflow sensor 940, it controls the first switch unit 910 to turn on, thereby connecting the circuit formed by the heating wire 950 and the battery. The heating wire 950 then heats up to produce smoke, which is delivered to the user's mouth through the e-cigarette mouthpiece, achieving the smoking effect. When the system control module detects that the user has stopped smoking through the airflow sensor 940, it controls the first switch unit 910 to turn off, breaking the circuit formed by the heating wire 950 and the battery, thus stopping the heating wire 950 from heating.

[0004] When a user smokes for an extended period (over-inhalation), such as more than 15 or 20 seconds, the airflow sensor 940 is continuously triggered during the smoking process. Alternatively, if the e-cigarette is being transported via logistics and the airflow sensor 940 is mistakenly triggered for an extended period (over-inhalation), the first switching unit 910 may operate for too long, causing its temperature to rise excessively and potentially exceed its maximum operating temperature, such as 150°C. This can reduce the lifespan or reliability of the first switching unit 910, and in severe cases, cause it to short-circuit and become damaged. Short-circuit damage or overheating of the first switching unit 910 can trigger a chain reaction, such as damaging surrounding system control modules.

[0005] To address the issue of prolonged operation of the first switching unit 910, the current solution involves the system control module controlling the trigger duration of the airflow sensor 940. When the trigger duration of the airflow sensor 940 exceeds a preset duration, such as 5 seconds or 10 seconds, the system control module forcibly stops the first switching unit 910, even if the airflow sensor 940 still detects airflow. This design helps protect the first switching unit 910 and its surrounding circuitry. Another existing system control module solution includes over-temperature protection. Summary of the Invention

[0006] However, the inventors of this application, through long-term research, discovered that the aforementioned over-inhalation protection mechanism has a certain probability of failure, or other situations beyond the aforementioned over-inhalation mechanism may exist: for example, the airflow detection is repeatedly and falsely triggered at very short intervals, and the duration of each trigger of the airflow sensor is less than the internal preset duration; or the system control module malfunctions, causing the first switching unit to operate continuously; or the first switching unit is damaged and short-circuited. In this case, the original method of controlling the inhalation duration by triggering the airflow sensor will fail. This leads to the first switching unit operating for a long time, or the first switching unit stopping for a very short time, resulting in insufficient heat dissipation and excessive temperature rise of the first switching unit. This causes the temperature inside the entire electronic cigarette to rise, leading to deterioration and damage of the first switching unit and its surrounding circuitry, resulting in serious damage to the electronic cigarette. Moreover, the continuous rise in the internal temperature of the electronic cigarette may cause it to ignite, posing a safety hazard. Furthermore, even if some system control module solutions have over-temperature protection functions, the temperature detection of over-temperature protection cannot fully reflect the operating temperature of the first switching unit, that is, the maximum operating temperature of the first switching unit has exceeded the maximum operating junction temperature of the device itself, but the temperature protection function has not yet detected it. This will also reduce the lifespan or reliability of the first switching unit. Furthermore, if the electronic cigarette's output power is relatively high, and the battery discharge current is in the ampere range, such as 5A, the battery will operate for an extended period through the first switch. Because the battery itself has internal resistance, prolonged high-current discharge will cause the battery's temperature to rise excessively, exceeding the battery's safe discharge temperature range and leading to safety issues.

[0007] The technical problem to be solved by the embodiments of this application is to provide a battery protection chip, a battery component, and an electronic cigarette, which can prevent the first switching unit from operating for a long time.

[0008] To address the aforementioned technical problems, the first aspect of this application provides a battery protection chip for electronic cigarettes, comprising a power supply pin, a second ground pin, a second switch control pin, an over-discharge voltage protection unit, a discharge overcurrent protection unit, a first reference voltage generation unit, and a logic control unit. The power supply pin and the second ground pin are electrically connected to the two ends of the battery, respectively. The logic control unit is electrically connected to the over-discharge voltage protection unit, the discharge overcurrent protection unit, and the second switch control pin. The second switch control pin is electrically connected to the control terminal of a second switch unit, which controls the battery to supply power to a heating branch. The heating branch includes a first switch unit and a heating element connected in series. The battery protection chip also includes a secondary over-suction protection unit and a heat detection pin. The secondary over-suction protection unit is electrically connected to the heat detection pin and the logic control unit, respectively. The heat detection pin is used to electrically connect to the connection point of the first switching unit and the heating element, or the heat detection pin is used to electrically connect to the control terminal of the first switching unit. When the secondary over-suction protection unit determines that the voltage of the heat detection pin is greater than a preset third reference voltage or less than a preset fourth reference voltage, the logic control unit starts timing. When the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switching unit to remain open.

[0009] Optionally, the secondary over-absorption protection unit includes an over-absorption comparator unit. One input terminal of the over-absorption comparator unit is electrically connected to the heat detection pin, and the other input terminal of the over-absorption comparator unit is connected to a third reference voltage or a fourth reference voltage. The output terminal of the over-absorption comparator unit is electrically connected to the logic control unit.

[0010] Optionally, the logic control unit includes a battery logic unit and an over-suction logic unit, wherein the battery logic unit is electrically connected to the over-discharge voltage protection unit, the over-discharge current protection unit, and the second switch control pin, respectively; the over-suction logic unit is electrically connected to the secondary over-suction protection unit; and the over-suction logic unit is electrically connected to the battery logic unit or the over-discharge voltage protection unit.

[0011] Optionally, when the over-suction logic unit time is greater than or equal to the second preset duration, the over-suction logic unit outputs a sleep signal to the battery logic unit or outputs an over-discharge signal to the over-discharge voltage protection unit. The battery logic unit controls the battery protection chip to enter sleep mode, and in sleep mode, the second switching unit remains open.

[0012] Optionally, in sleep mode, at least some units of the battery protection module stop consuming power, or all units of the battery protection module stop consuming power.

[0013] Optionally, the logic control unit includes a battery logic unit and an over-suction logic unit, wherein the battery logic unit is electrically connected to the over-discharge voltage protection unit and the over-discharge current protection unit, the over-suction logic unit is electrically connected to the secondary over-suction protection unit, and both the over-suction logic unit and the battery logic unit are electrically connected to the second switch control pin to control whether the second switch unit is disconnected.

[0014] Optionally, the logic control unit further includes a logic gate circuit. One input terminal of the logic gate circuit is electrically connected to the battery logic unit, and the other input terminal is electrically connected to the over-suction logic unit. The output terminal of the logic gate circuit is electrically connected to the second switch control pin. When the logic gate circuit receives any signal to turn off the second switch unit, the logic gate circuit controls the second switch unit to turn off through the second switch control pin. When both the battery logic unit and the over-suction logic unit output signals to turn on the second switch unit, the logic gate circuit controls the second switch unit to turn on through the second switch control pin.

[0015] Optionally, the logic control unit includes an over-sucking logic unit, which includes a second timing unit and a second duration control unit. The input terminal of the second timing unit is electrically connected to the secondary over-sucking protection unit, and the output terminal of the second timing unit is electrically connected to the second duration control unit. The second duration control unit is electrically connected to the second switch control pin. When the secondary over-sucking protection unit determines that the voltage of the heat detection pin is greater than a third reference voltage or less than a fourth reference voltage, the second timing unit starts timing. When the secondary over-sucking protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the second timing unit stops timing. When the second duration control unit determines that the timing duration of the second timing unit is greater than or equal to a second preset duration, the second duration control unit outputs a secondary over-sucking protection signal to control the second switch unit to remain open; or... The logic control unit includes a battery logic unit and an over-suction logic unit. The battery logic unit is electrically connected to the over-discharge voltage protection unit, the over-discharge current protection unit, and the second switch control pin, respectively. The over-suction logic unit includes a second timing unit and a second duration control unit. The input terminal of the second timing unit is electrically connected to the second-level over-suction protection unit, and the output terminal of the second timing unit is electrically connected to the second duration control unit. The output terminal of the second duration control unit is electrically connected to either the battery logic unit or the over-discharge voltage protection unit. When the second-level over-suction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second timing unit starts timing. When the second-level over-suction protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the second timing unit stops timing. When the second duration control unit determines that the timing duration of the second timing unit is greater than or equal to the second preset duration, the second duration control unit outputs a sleep signal to the battery logic unit or outputs an over-discharge signal to the over-discharge voltage protection unit. The battery logic unit controls the battery protection chip to enter sleep mode, and in sleep mode, the second switch unit remains open.

[0016] Optionally, the second timing unit includes a first reference frequency generator and a second timing subunit; wherein, the second timing subunit is electrically connected to the secondary over-extraction protection unit, the second duration control unit, and the first reference frequency generator, respectively. When the secondary over-extraction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second timing subunit starts timing; when the secondary over-extraction protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the second timing subunit stops timing; or, The second timing unit includes a second reference frequency generator and a second timing subunit. The second reference frequency generator is electrically connected to the secondary over-absorption protection unit. The second timing subunit is electrically connected to the second duration control unit and the second reference frequency generator, respectively. When the secondary over-absorption protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second reference frequency generator starts to work. When the secondary over-absorption protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the second reference frequency generator stops working.

[0017] Optionally, the logic control unit includes an over-sucking logic unit, which includes a second timing unit, a second duration control unit, a third timing unit, and a third duration control unit. The input terminals of the second timing unit and the third timing unit are electrically connected to the secondary over-sucking protection unit. The second timing unit is electrically connected to the second duration control unit, and the third timing unit is electrically connected to the third duration control unit. The third duration control unit is electrically connected to the second timing unit, and the second duration control unit is electrically connected to the second switch control pin. When the secondary over-sucking protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second timing unit starts timing. When the secondary over-sinking protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the third timing unit starts timing. When the secondary over-sinking protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the third timing unit stops timing. When the third duration control unit determines that the timing duration of the third timing unit is greater than or equal to the third preset duration, it outputs a reset signal to the second timing unit to stop timing and set the timing duration to zero. When the second duration control unit determines that the timing duration of the second timing unit is greater than or equal to the second preset duration, the second duration control unit outputs a secondary over-sinking protection signal to control the second switching unit to remain open; or... The logic control unit includes a battery logic unit and an over-suction logic unit. The battery logic unit is electrically connected to the over-discharge voltage protection unit, the over-discharge current protection unit, and the second switch control pin, respectively. The over-suction logic unit includes a second timing unit, a second duration control unit, a third timing unit, and a third duration control unit. The input terminals of the second timing unit and the third timing unit are electrically connected to the secondary over-suction protection unit, respectively. The second timing unit is electrically connected to the second duration control unit, the third timing unit is electrically connected to the third duration control unit, and the third duration control unit is electrically connected to the second timing unit. The second duration control unit is electrically connected to either the battery logic unit or the over-discharge voltage protection unit. When the secondary over-suction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second timing unit starts... The timing mechanism is as follows: when the secondary over-suction protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the third timing unit starts timing; when the secondary over-suction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the third timing unit stops timing. When the third duration control unit determines that the timing duration of the third timing unit is greater than or equal to the third preset duration, it outputs a reset signal to the second timing unit to stop timing and set the timing duration to zero. When the second duration control unit determines that the timing duration of the second timing unit is greater than or equal to the second preset duration, the second duration control unit outputs a sleep signal to the battery logic unit or outputs an over-discharge signal to the over-discharge voltage protection unit. The battery logic unit controls the battery protection chip to enter sleep mode, and in sleep mode, the second switching unit remains open.

[0018] Optionally, the second timing unit includes a first reference frequency generator and a second timing subunit, and the third timing unit includes a third timing subunit; wherein, the second timing subunit is electrically connected to the secondary over-extraction protection unit, the second duration control unit, and the first reference frequency generator, respectively; the third timing subunit is electrically connected to the secondary over-extraction protection unit, the third duration control unit, and the first reference frequency generator, respectively; the third duration control unit is electrically connected to the second timing subunit; when the secondary over-extraction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second timing subunit starts timing; when the secondary over-extraction protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the third timing subunit starts timing; when the secondary over-extraction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the third timing subunit stops timing; when the third duration control unit determines that the timing duration of the third timing subunit is greater than or equal to the third preset duration, it outputs a reset signal to the second timing subunit to stop the second timing unit from timing and set the timing duration to zero; or... The second timing unit includes a second reference frequency generator and a second timing subunit, and the third timing unit includes a third timing subunit; wherein, the second reference frequency generator is electrically connected to the secondary over-extraction protection unit, the second timing subunit is electrically connected to the second duration control unit and the second reference frequency generator respectively, the third timing subunit is electrically connected to the secondary over-extraction protection unit, the third duration control unit and the second reference frequency generator respectively, and the third duration control unit is electrically connected to the second timing subunit and the second reference frequency generator respectively. When the secondary over-extraction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second... The reference frequency generator starts working, and the second timing subunit starts timing. When the secondary over-sucking protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the third timing subunit starts timing. When the secondary over-sucking protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the third timing subunit stops timing. When the third duration control unit determines that the timing duration of the third timing subunit is greater than or equal to the third preset duration, it outputs a reset signal to the second timing subunit and the second reference frequency generator to set the timing duration of the second timing unit to zero and to stop the second reference frequency generator from working; or... The third preset duration is less than one-tenth of the second preset duration.

[0019] Optionally, the second switch control pin includes a charging control pin and a discharging control pin. The charging control pin is used to be electrically connected to the control terminal of the charging switch unit, and the discharging control pin is used to be electrically connected to the control terminal of the discharging switch unit. When the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the discharging control pin to keep the discharging switch unit disconnected.

[0020] Optionally, the battery protection module further includes a charging detection unit, which is electrically connected to the logic control unit and the heat detection pin respectively. When the charging detection unit detects a charging signal, the second switching unit is turned on.

[0021] Optionally, the second preset duration is adjustable.

[0022] Optionally, the logic control unit includes an oversinking logic unit, which includes a first reference frequency generating unit or a second reference frequency generating unit. The first or second reference frequency generating unit includes a frequency comparator, a frequency switching unit, a first current source, and a frequency capacitor pin. The first terminal of the first current source is electrically connected to a power supply pin, and the second terminal of the first current source is electrically connected to the first terminal of the frequency switching unit, one input terminal of the frequency comparator, and the frequency capacitor pin. The other input terminal of the frequency comparator is connected to a preset first frequency reference voltage. The output terminal of the frequency comparator is electrically connected to the control terminal of the frequency switching unit. The second terminal of the frequency switching unit is electrically connected to a second ground pin. The frequency capacitor pin is used to connect to a frequency capacitor, and the second preset duration is proportional to the capacitance value of the frequency capacitor. Alternatively... The logic control unit includes an oversinking logic unit, which includes either a first reference frequency generating unit or a second reference frequency generating unit. The first or second reference frequency generating unit includes a frequency comparator, a frequency operational amplifier, a frequency switching unit, a first current source, a second current source, a frequency capacitor, and a frequency resistor pin. The first current source includes a first frequency MOSFET, and the second current source includes a second frequency MOSFET. The sources of both the first and second frequency MOSFETs are electrically connected to a power supply pin, and the gates of both are electrically connected and connected to the output of the frequency operational amplifier. One input terminal of the frequency amplifier is connected to a preset second frequency reference voltage. The other input terminal of the frequency operational amplifier is electrically connected to the drain of the second frequency MOSFET. The drain of the second frequency MOSFET is also electrically connected to the frequency resistor pin. The drain of the first frequency MOSFET is electrically connected to the first terminal of the frequency switching unit, one input terminal of the frequency comparator, and the first terminal of the frequency capacitor, respectively. The other input terminal of the frequency comparator is connected to a preset first frequency reference voltage. The output terminal of the frequency comparator is electrically connected to the control terminal of the frequency switching unit. The second terminal of the frequency switching unit and the second terminal of the frequency capacitor are both electrically connected to the second ground pin. The frequency resistor pin is used to electrically connect to the frequency resistor. The second preset duration is used to be proportional to the resistance value of the frequency resistor.

[0023] A second aspect of this application provides a battery assembly for use in electronic cigarettes, comprising: Battery; In the aforementioned battery protection chip, the power supply terminal and the second ground terminal of the battery protection chip are electrically connected to the two ends of the battery, respectively. The second switching unit has a first end electrically connected to the positive or negative terminal of the battery, a second end electrically connected to the atomizing component, a second end electrically connected to the heat detection pin, and a control end electrically connected to the second switch control pin.

[0024] A third aspect of this application provides an electronic cigarette, including an atomizing component. The atomizing component includes a system control circuit and a heating element. The system control circuit includes a first switching unit and a system control module. The control terminal of the first switching unit is electrically connected to the system control module. The first switching unit and the heating element are connected in series to form a heating branch. It also includes the aforementioned battery protection chip or the aforementioned battery assembly, wherein one end of the heating branch is used to be electrically connected to one end of the battery via the second switching unit, and the other end of the heating branch is used to be electrically connected to the other end of the battery.

[0025] Optionally, the system control module includes a battery terminal and a first ground terminal, which are used to electrically connect to the two ends of the battery assembly. The first switching unit is an NMOS transistor, or the heating element is electrically connected to the battery terminal via the first switching unit. When the secondary over-sink protection unit determines that the voltage of the heating detection pin is greater than a preset third reference voltage, the logic control unit starts timing. When the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switching unit to remain open; or... The system control module includes a battery terminal and a first ground terminal, which are used to electrically connect to the two ends of the battery assembly. The first switching unit is a PMOS transistor or the heating element is used to electrically connect to the first ground terminal via the first switching unit. When the secondary over-sinking protection unit determines that the voltage of the heating detection pin is less than the preset fourth reference voltage, the logic control unit starts timing. When the timing duration of the logic control unit is greater than or equal to the second preset duration, the logic control unit controls the second switching unit to remain open.

[0026] Optionally, the system control module includes an airflow detection terminal and a system control unit. The airflow detection terminal is electrically connected to an airflow detection element and the system control unit. The system control unit includes a first timing unit. When the system control unit detects airflow through the airflow detection element, the first timing unit starts timing, and the system control unit drives a first switching unit to work. When the system control unit does not detect airflow through the airflow detection element, the first timing unit stops timing and sets the time to zero, and the system control unit stops driving the first switching unit to stop it from working. When the timing duration of the first timing unit is greater than or equal to a first preset duration, the system control unit stops driving the first switching unit to stop it from working, and the first preset duration is less than a second preset duration.

[0027] Optionally, the ratio of the second preset duration to the first preset duration is in the range of 1.1:1 to 2:1; or, Both the first preset duration and the second preset duration are adjustable.

[0028] Optionally, the system control module drives the first switching unit to work using PWM or PFM, or the system control module drives the first switching unit to work using a normally-on conduction method.

[0029] This embodiment of the application sets the logic control unit to keep the second switching unit open when the timing duration of the logic control unit is greater than or equal to a second preset duration. When the second switching unit is open, the main discharge circuit is disconnected. Even if the first switching unit is still open and conducting, the battery will not supply power to the system control circuit, thus preventing the heating element from heating up again and the temperature of the first switching unit and its surroundings from rising. This prevents the first switching unit or system control module from being damaged by high temperatures, which could lead to further damage to the e-cigarette and, in particular, prevent fires. Moreover, this embodiment uses the second switching unit in the battery protection circuit, eliminating the need for additional switching units. The battery protection module only requires simple modifications to achieve the two-stage over-extraction protection function. The peripherals of the battery protection circuit and the system control circuit remain almost unchanged, incurring little or no additional cost. Furthermore, the two-stage over-extraction protection scheme of this application is compatible with existing e-cigarettes and has a wide range of applications. Furthermore, in this embodiment, the battery protection circuit is a certain distance from the first switching unit and the system control module, and they are relatively independent of each other. Even if the first switching unit and the system control module are damaged, the battery protection circuit is only slightly affected by the first switching unit and the system control module. The battery protection circuit in this embodiment has a high reliability and high safety due to the two-stage over-suction protection function. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a circuit module diagram of an existing atomizing component; Figure 2 This is a circuit block diagram of the electronic cigarette according to the first embodiment of this application; Figure 3a This is a circuit block diagram of the battery protection circuit in the first embodiment; Figure 3b This is a schematic diagram showing the connection of the secondary over-suction protection unit, the logic control unit, and the second switching unit in the first embodiment; Figure 3c This is a schematic diagram showing the connection between the secondary oversucking protection unit and the oversucking logic unit in the first embodiment; Figure 3d This is a schematic diagram showing the connection between the secondary oversucking protection unit and the oversucking logic unit in another embodiment of this application; Figure 3eThis is a circuit block diagram of a first reference frequency generating unit or a second reference frequency generating unit according to an embodiment of this application; Figure 3f This is a circuit block diagram of a first reference frequency generating unit or a second reference frequency generating unit according to another embodiment of this application; Figure 4 This is a circuit module diagram of an electronic cigarette according to another embodiment of this application; Figure 5 This is a circuit block diagram of the electronic cigarette according to the second embodiment of this application; Figure 6 This is a circuit module diagram of an electronic cigarette according to another embodiment of this application; Figure 7 This is a schematic diagram showing the connection of the secondary over-suction protection unit, the logic control unit, and the second switching unit in the third embodiment of this application; Figure 8 This is a schematic diagram showing the connection between the secondary oversucking protection unit and the oversucking logic unit in the fourth embodiment of this application; Figure 9 This is a schematic diagram showing the connection between the secondary oversucking protection unit and the oversucking logic unit in another embodiment of this application; Figure 10a This is a circuit block diagram of the electronic cigarette according to the fifth embodiment of this application; Figure 10b This is a circuit module diagram of an electronic cigarette according to another embodiment of this application; Figure 10c This is a circuit module diagram of an electronic cigarette according to another embodiment of this application; Figure 10d This is a circuit block diagram of an electronic cigarette according to another embodiment of this application; Figure 10e This is a circuit block diagram of an electronic cigarette according to another embodiment of this application; Figure 10f This is a circuit block diagram of an electronic cigarette according to another embodiment of this application; Figure 11 This is a circuit block diagram of the electronic cigarette according to the sixth embodiment of this application; Figure 12a This is a circuit block diagram of the battery protection circuit in the sixth embodiment; Figure 12b This is a schematic diagram showing the connection of the secondary over-suction protection unit, the logic control unit, and the second switching unit in the sixth embodiment; Figure 12c This is a schematic diagram showing the connection between the secondary oversucking protection unit and the oversucking logic unit in the sixth embodiment; Figure 13 This is a circuit module diagram of an electronic cigarette according to another embodiment of this application; Figure 14 This is a circuit block diagram of the electronic cigarette according to the seventh embodiment of this application; Figure 15 This is a circuit module diagram of an electronic cigarette according to another embodiment of this application; Figure 16a This is a circuit block diagram of the electronic cigarette according to the eighth embodiment of this application; Figure 16b This is a circuit module diagram of an electronic cigarette according to another embodiment of this application; Figure 16c This is a circuit block diagram of an electronic cigarette according to another embodiment of this application; Figure 16d This is a circuit block diagram of an electronic cigarette according to another embodiment of this application; Figure 17 This is a circuit block diagram of an electronic cigarette according to the ninth embodiment of this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] The terms "comprising" and "having," and any variations thereof, appearing in this application specification, claims, and drawings, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices. Furthermore, the terms "first," "second," and "third," etc., are used to distinguish different objects and are not used to describe a specific order. Electrical connections in this application include direct electrical connections and indirect electrical connections. Indirect electrical connections refer to connections where other electronic components, pins, etc., may exist between the two electrically connected components. The "XX terminal" mentioned in this application may or may not be an actual terminal; for example, it may simply be one end of a component or one end of a wire. The mention of "and / or including" three cases in this application, such as A and / or B, includes all three cases: A, B, and A and B.

[0034] Please see Figure 2This application provides an electronic cigarette, which includes a battery assembly 100 and an atomizing assembly 200. The battery assembly 100 includes a battery 110 (bare battery) and a battery protection circuit 120, which are generally packaged together to provide power. The atomizing assembly 200 is electrically connected to the battery assembly 100, and the battery assembly 100 is used to power the atomizing assembly 200. The atomizing assembly 200 generally includes a system control circuit, an atomizing core, and an airflow detection element 240, etc. The system control circuit is electrically connected to the battery assembly 100. The atomizing core includes a heating element 250. The heating element 250 and the airflow detection element 240 are respectively electrically connected to the system control circuit. The heating element 250 is used to heat the e-liquid to atomize and produce smoke, and the airflow detection element 240 is used to detect whether there is airflow inside the electronic cigarette.

[0035] In one embodiment of this application, the battery 110 is a rechargeable battery such as a lithium battery 110, or it can be a non-rechargeable battery 110. The capacity of the battery 110 is generally 100mAh-2000mAh, for example, 100mAh, 200mAh, 300mAh, 400mAh, 500mAh, 600mAh, 700mAh, 800mAh, 900mAh, 1000mAh, 1100mAh, 1200mAh, 1300mAh, 1400mAh, 1500mAh, 1600mAh, 1700mAh, 1800mAh, 1900mAh, 2000mAh, etc., preferably 300mAh-800mAh. The number of batteries 110 is generally one, but it can also be multiple. When there are multiple batteries, they can be connected in parallel, in series, or in a mixed series-parallel connection, which can be set according to actual needs of the electronic cigarette.

[0036] In this application, the battery protection circuit 120 includes a battery protection module 130, which is electrically connected to the battery 110. A first resistor R1 and a first capacitor C1 are also provided between the battery 110 and the battery protection module 130. The first resistor R1 and the first capacitor C1 are used for voltage regulation and filtering. In other embodiments of this application, the first resistor R1 and the first capacitor C1 may not be provided between the battery 110 and the battery protection module 130, or only one of them may be provided. Of course, other circuits or electronic components may also be provided.

[0037] In this application, the battery protection module 130 is used to protect the battery 110 and prevent permanent damage to the battery 110 itself under conditions such as over-discharge or overcurrent discharge. Please refer to [link to relevant documentation]. Figure 3aIn this application, the battery protection module 130 includes a power supply terminal VDD, a second ground terminal GND2, an over-discharge voltage protection unit 131, a discharge overcurrent protection unit 134, a system terminal VM, a first reference voltage generation unit 138, and a logic control unit 150. The power supply terminal VDD and the second ground terminal GND2 are electrically connected to the positive and negative terminals of the battery 110, respectively, so that the battery 110 can supply power to the battery protection module 130. The system terminal VM is used to monitor the real-time current flowing through the atomizing component 200; of course, the system terminal VM may also have other functions.

[0038] In this application, the first reference voltage generating unit 138 provides a reference voltage for the over-discharge voltage protection unit 131, the over-discharge current protection unit 134, etc., to determine whether the battery 110 is in an over-discharge voltage state, an over-discharge current state, etc.

[0039] The over-discharge voltage protection unit 131 is used to protect the battery 110 when the battery 110 voltage is detected to be lower than the reference voltage provided by the first reference voltage generation unit 138 during the discharge process. For example, it controls the battery 110 to only discharge to a minimum, and generally stops the power supply to the atomizing component 200 to prevent the battery 110 from being over-discharged and causing permanent damage to the battery 110.

[0040] The discharge overcurrent protection unit 134 is used to protect the battery 110 when an excessive discharge current is detected during the discharge process of the battery 110, such as by stopping the battery 110 from discharging, to prevent the excessive discharge current from causing permanent damage to the battery 110 or safety problems.

[0041] The logic control unit 150 is used to control the working state and control logic of each module of the battery protection circuit 120, control whether the battery 110 discharges to the outside, and control whether the battery 110 is charged.

[0042] In one embodiment of this application, the electronic cigarette has a charging function. In this case, the battery protection module 130 may further include an overcharge voltage protection unit 132 and a charging overcurrent protection unit 133. The overcharge voltage protection unit 132 protects the battery 110 during charging when it detects that the battery voltage is higher than the reference voltage provided by the first reference voltage generation unit 138, preventing the battery 110 from continuing to charge after it is fully charged, thus preventing damage to the battery 110. The charging overcurrent protection unit 133 protects the battery 110 during charging when it detects that the charging current is too high, for example, by stopping the charging of the battery 110, preventing permanent damage or safety issues caused by excessive charging current. In another embodiment of this application, the electronic cigarette may not have a charging function, in which case charging protection is not required. Additionally, in this embodiment, the battery protection module 130 further includes a short-circuit protection unit 135, a temperature protection unit 136, and a reference frequency generation unit 137.

[0043] In this application, the battery protection circuit 120 also includes a second switching unit 140. The connection between the second switching unit 140 and the battery protection module 130 generally includes the following methods. Of course, those skilled in the art can also make simple modifications to the circuit described below as needed, which is also within the scope of this application.

[0044] 1. Please continue reading Figure 2The battery protection module 130 includes a second switch control terminal CO / DO, which is electrically connected to the logic control unit 150. The control terminal of the second switch unit 140 is electrically connected to the second switch control terminal CO / DO, meaning the second switch unit 140 is located outside the battery protection module 130. The first terminal of the second switch unit 140 is electrically connected to the negative terminal of the battery 110 (the second switch unit 140 is located at the bottom). The negative terminal of the battery 110 is grounded. The second terminal of the second switch unit 140 is electrically connected to the system control circuit and the system terminal VM, respectively. In this embodiment, the logic control unit 150 controls the second switch unit 140 to turn on or off via the second switch control terminal CO / DO. Therefore, when the logic control unit 150 controls the second switch unit 140 to turn on, the battery 110 can supply power to the atomizing assembly 200 through the second switch unit 140, and the atomizing assembly 200 is in normal working mode, allowing the electronic cigarette to function normally. When the logic control unit 150 controls the second switch unit 140 to turn off, the battery 110 stops supplying power to the atomizing assembly 200, the system control circuit is not powered, and consequently, the airflow detection element 240, heating element 250, etc., cannot be powered. The system control circuit, airflow detection element 240, heating element 250, etc., consume no power, and the electronic cigarette cannot function normally, remaining in a dormant state. In one embodiment of this application, the battery protection module 130 can be implemented on the first chip, which is then the battery protection chip. That is, the second switching unit 140 is not on the first chip (the second switching unit 140 can be located on another chip or not on a chip, with the first switching unit 210 externally mounted). In this case, the power supply terminal VDD is the power supply pin, the second ground terminal GND2 is the second ground pin, the system terminal VM is the system pin, and the second switch control terminal CO / DO is the second switch control pin. Of course, in other embodiments of this application, the battery protection module 130 may not be implemented on the chip, and the design can be customized according to user needs. When the battery protection module 130 is implemented on one chip and the second switching unit 140 is implemented on another chip, the two chips can be packaged together or not.

[0045] 2. Please see Figure 4The second switch unit 140 is built into the battery protection module 130 (the second switch unit 140 is built-in, and at this time, the second switch unit 140 and the battery protection module 130 are located on the same chip). At this time, the control terminal of the second switch unit 140 is electrically connected to the logic control unit 150, the first terminal of the second switch unit 140 is electrically connected to the second ground terminal GND2, the second ground terminal GND2 is electrically connected to the negative terminal of the battery 110 (the second switch unit 140 is located at the bottom), and the second terminal of the second switch unit 140 is electrically connected to the system terminal VM of the battery protection module 130. The system terminal VM is electrically connected to the system control circuit. In this embodiment, the logic control unit 150 controls the second switch unit 140 to turn on or off. Therefore, when the logic control unit 150 controls the second switch unit 140 to turn on, the battery 110 can supply power to the system control circuit through the second switch unit 140, and the system control circuit is in normal working mode. When the logic control unit 150 controls the second switch unit 140 to turn off, the battery 110 stops supplying power to the system control circuit, and the electronic cigarette is in sleep mode. In one embodiment of this application, the battery protection module 130 and the second switching unit 140 are integrated onto the same chip. In this case, the chip is a battery protection chip, with the power supply terminal VDD as the power supply pin, the second ground terminal GND2 as the second ground pin, and the system terminal VM as the system pin. Of course, in other embodiments of this application, the battery protection module 130 may not be integrated onto a chip, and the design can be tailored to the user's needs.

[0046] 3. Please see Figure 5The battery protection module 130 includes a second switch control terminal CO / DO, which is electrically connected to the logic control unit 150. The control terminal of the second switch unit 140 is also electrically connected to the second switch control terminal CO / DO, meaning the second switch unit 140 is located outside the battery protection module 130. The first terminal of the second switch unit 140 is electrically connected to the positive terminal of the battery 110 (the second switch unit 140 is located on top), and the second terminal of the second switch unit 140 is electrically connected to the system control circuit and the system terminal VM, respectively. In this embodiment, the logic control unit 150 controls the second switch unit 140 to turn on or off via the second switch control terminal CO / DO. Therefore, when the logic control unit 150 controls the second switch unit 140 to turn on, the battery 110 can supply power to the system control circuit through the second switch unit 140, and the system control circuit is in normal operating mode. When the logic control unit 150 controls the second switch unit 140 to turn off, the battery 110 stops supplying power to the system control circuit. In one embodiment of this application, the battery protection module 130 can be implemented on a first chip, which is then a battery protection chip. That is, the first switching unit 210 is not on the first chip (the first switching unit 210 can be located on another chip or not on a chip; the second switching unit 140 is external). In this case, the power supply terminal VDD is the power supply pin, the second ground terminal GND2 is the second ground pin, the system terminal VM is the system pin, and the second switch control terminal CO / DO is the second switch control pin. Of course, in other embodiments of this application, the battery protection module 130 may not be implemented on a chip; it can be designed according to the user's needs.

[0047] 4. Please see Figure 6The second switching unit 140 is built into the battery protection module 130 (the second switching unit 140 is built-in, and in this case, the second switching unit 140 and the battery protection module 130 are implemented on the same chip). The control terminal of the second switching unit 140 is electrically connected to the logic control unit 150. The first terminal of the second switching unit 140 is electrically connected to the power supply terminal VDD, which is electrically connected to the positive terminal of the battery 110 (the second switching unit 140 is located on top). The second terminal of the second switching unit 140 is electrically connected to the system terminal VM, which is electrically connected to the system control circuit. In this embodiment, the logic control unit 150 controls the second switching unit 140 to turn on or off. Therefore, when the logic control unit 150 controls the second switching unit 140 to turn on, the battery 110 can supply power to the system control circuit through the second switching unit 140, and the system control circuit is in normal operating mode. When the logic control unit 150 controls the second switching unit 140 to turn off, the battery 110 stops supplying power to the system control circuit. In one embodiment of this application, the battery protection module 130 and the second switching unit 140 are integrated onto the same chip. In this case, the chip is a battery protection chip, with the power supply terminal VDD as the power supply pin, the second ground terminal GND2 as the second ground pin, and the system terminal VM as the system pin. Of course, in other embodiments of this application, the battery protection module 130 may not be integrated onto a chip, and the design can be tailored to the user's needs.

[0048] For the four connection methods mentioned above, please refer to [link / reference]. Figure 3a The second switching unit 140 includes a charging switching unit 142 and a discharging switching unit 141 (generally external to the first switching unit 210, but can also be internal). The charging switching unit 142 and the discharging switching unit 141 are MOS or other suitable field-effect transistors, such as NMOS or PMOS. The charging switching unit 142 and the discharging switching unit 141 are electrically connected to the logic control unit 150, for example, in... Figure 2 and Figure 4In the battery protection module 130, the second switch control terminal CO / DO includes a charging switch control terminal CO and a discharging switch control terminal DO. The charging switch control terminal CO is electrically connected to the control terminal of the charging switch unit 142, and the discharging switch control terminal DO is electrically connected to the control terminal of the discharging switch unit 141. The charging switch control terminal CO and the discharging switch control terminal DO are respectively electrically connected to the logic control unit 150, so that the logic control unit 150 can control the charging switch unit 142 and the discharging switch unit 141 respectively. When it is necessary to control the discharge to stop, the logic control unit 150 controls the discharging switch unit 141 to be cut off through the discharging switch control terminal DO. At this time, the charging switch unit 142 is generally turned on and can charge the battery 110. In other embodiments of this application, the second switching unit 140 may further include a switching transistor and a substrate control circuit (generally built into the first switching unit 210, but can also be external). The switching transistor is a MOS or other field-effect transistor, such as an NMOS or PMOS. The control terminal of the switching transistor is electrically connected to the logic control unit 150 through the second switch control terminal CO / DO. The substrate control circuit is electrically connected to the logic control unit 150. The substrate control circuit is used to correctly bias the substrate of the switching transistor. For example, when the battery 110 is discharging and charging, the substrate of the switching transistor is in different bias states. For example, when it is necessary to control the stopping of discharge, the logic control unit 150 controls the switching transistor to turn off through the second switch control terminal CO / DO, and at the same time controls the substrate of the switching transistor to be biased to the charging state through the substrate control circuit. At this time, the battery can be charged, that is, the charging circuit is conducting and the main discharge circuit is disconnected. However, this application is not limited to this. In other embodiments of this application, the second switching unit 140 may also have other implementations, such as including only one switching transistor, in which case the switching transistor controls the discharge.

[0049] In one embodiment of this application, the atomizing core of the atomizing assembly 200 generally includes two types: a ceramic atomizing core and a cotton atomizing core. The ceramic atomizing core includes a ceramic base and a heating element 250. The heating element 250 is mounted on or inside the ceramic base. The ceramic base is connected to the e-liquid tank to replenish the e-liquid in the tank. When the heating element 250 heats up, the ceramic base is heated, thereby heating the e-liquid and achieving atomization. The cotton atomizing core includes wicking cotton and a heating element 250. The wicking cotton is located on the heating element 250 and is connected to the e-liquid tank to replenish the cotton. When the heating element 250 heats up, the wicking cotton on the heating element 250 is heated, and the e-liquid absorbed by the cotton is heated, achieving atomization. Generally, the heating element 250 is a heating wire or heating coil, and the material of the heating wire or heating coil is, for example, iron-chromium-aluminum, stainless steel, nickel-chromium alloy, pure nickel, pure titanium, etc. This application is not limited to the two types of atomizing cores mentioned above; those skilled in the art may also use other conventional atomizing cores.

[0050] Please continue reading Figure 2 In one embodiment of this application, the system control circuit includes a system control module 272 and a first switching unit 210. The system control module 272 includes a battery terminal BAT1, a first ground terminal GND1, an atomizing terminal AT, an airflow detection terminal EN, and a system control unit 220. The battery terminal BAT1 and the first ground terminal GND1 are electrically connected to the battery assembly 100; the atomizing terminal AT is electrically connected to the heating element 250; and the airflow detection terminal EN is electrically connected to an airflow detection element 240, which may be, for example, an airflow sensor, such as a capacitive microphone or a switching microphone. In this embodiment, the system control unit 220 is electrically connected to the battery terminal BAT1, the first ground terminal GND1, the control terminal of the first switching unit 210, and the atomizing terminal AT.

[0051] In this application, the first switching unit 210 and the heating element 250 are connected in series to form a heating branch. The battery 110, the second switching unit 140, the heating branch, and the system control module 272 are electrically connected to form a discharge main circuit. The battery 110 and the second switching unit 140 are connected in series, and the heating branch and the system control module 272 are connected in parallel to form a parallel circuit. The parallel circuit is connected in series with the battery 110 and the second switching unit 140 to form a discharge main circuit.

[0052] In this application, the layout of the first switching unit 210 and the system control module 272 generally has the following four arrangements. Of course, those skilled in the art can also make simple modifications to the circuit described below as needed, which is also within the scope of this application.

[0053] 1. Please refer to the following: Figure 2 , Figure 11The first switching unit 210 and the system control module 272 are located on the same chip (the first switching unit 210 is built-in), which can be referred to as the atomization control chip. The first end of the first switching unit 210 is electrically connected to the battery terminal BAT1 (the first switching unit 210 is located on top). The second end of the first switching unit 210 is electrically connected to the atomizing terminal AT. The atomizing terminal AT is electrically connected to one end of the heating element 250, and the other end of the heating element 250 is electrically connected to the first ground terminal GND1. The control terminal of the first switching unit 210 is electrically connected to the system control unit 220. In this embodiment, the system control unit 220 controls the first switching unit 210 to turn on or off. Thus, when the system control unit 220 controls the first switching unit 210 to turn on, the heating branch is connected, and the heating element 250 generates heat. When the system control unit 220 controls the first switching unit 210 to turn off, the heating branch is disconnected, and the heating element 250 stops generating heat. When the system control module 272 is located on the chip, the battery terminal BAT1 is the battery pin, the first ground terminal GND1 is the first ground pin, the atomization terminal AT is the atomization pin, and the airflow detection terminal EN is the airflow detection pin.

[0054] 2. Please see Figure 13 The first switching unit 210 and the system control module 272 are not located on the same chip (the first switching unit 210 is external). The first end of the first switching unit 210 is electrically connected to the battery terminal BAT1 (the first switching unit 210 is top-mounted), and the second end of the first switching unit 210 is electrically connected to the atomizing terminal AT. The atomizing terminal AT is electrically connected to one end of the heating element 250, and the other end of the heating element 250 is electrically connected to the first ground terminal GND1. The control terminal of the first switching unit 210 is electrically connected to the system control unit 220 through the first switch control terminal GT (pin). In this embodiment, the system control unit 220 controls the first switching unit 210 to turn on or off. Therefore, when the system control unit 220 controls the first switching unit 210 to turn on, the heating element 250 generates heat; when the system control unit 220 controls the first switching unit 210 to turn off, the heating element 250 stops generating heat. In this embodiment, the first switching unit 210 is located on one chip, and the system control module 272 is located on another chip. The two chips may or may not be packaged together. Additionally, in other embodiments of this application, the system control module 272 may not have an atomizing terminal AT (pin), in which case the second terminal of the first switching unit 210 is electrically connected to one end of the heating element 250.

[0055] 3. Please see Figure 14The first switching unit 210 and the system control module 272 are located on the same chip (the first switching unit 210 is built-in). The first end of the first switching unit 210 is electrically connected to the first ground terminal GND1 (the first switching unit 210 is located at the bottom). The second end of the first switching unit 210 is electrically connected to the atomizing terminal AT. The atomizing terminal AT is used to electrically connect to one end of the heating element 250. The other end of the heating element 250 is electrically connected to the battery terminal BAT1. The control terminal of the first switching unit 210 is electrically connected to the system control unit 220. In this embodiment, the system control unit 220 controls the first switching unit 210 to turn on or off. Therefore, when the system control unit 220 controls the first switching unit 210 to turn on, the heating element 250 generates heat. When the system control unit 220 controls the first switching unit 210 to turn off, the heating element 250 stops generating heat.

[0056] 4. Please see Figure 15 The first switching unit 210 and the system control module 272 are not located on the same chip (the first switching unit 210 is external). The first end of the first switching unit 210 is electrically connected to the first ground terminal GND1 (the first switching unit 210 is located below). The second end of the first switching unit 210 is electrically connected to the atomizing terminal AT. The atomizing terminal AT is electrically connected to one end of the heating element 250, and the other end of the heating element 250 is electrically connected to the battery terminal BAT1. The control terminal of the first switching unit 210 is electrically connected to the system control unit 220 through the first switch control terminal GT (pin). In this embodiment, the system control unit 220 controls the first switching unit 210 to turn on or off. Therefore, when the system control unit 220 controls the first switching unit 210 to turn on, the heating element 250 generates heat. When the system control unit 220 controls the first switching unit 210 to turn off, the heating element 250 stops generating heat. In this embodiment, the first switching unit 210 is located on one chip, and the system control module 272 is located on another chip. The two chips may or may not be packaged together. Additionally, in other embodiments of this application, the system control module 272 may not have an atomizing terminal AT (pin), in which case the second terminal of the first switching unit 210 is electrically connected to one end of the heating element 250.

[0057] In this application, the first switching unit 210 includes an NMOS transistor or a PMOS transistor, etc. This embodiment uses a PMOS transistor as an example for explanation. When the system control unit 220 detects no airflow (e.g., the user is not smoking) through the airflow detection element 240, the system control unit 220 stops driving the first switching unit 210 to stop it from working. At this time, the first switching unit 210 is turned off, the heating branch is disconnected, and the heating element 250 does not heat. When the system control unit 220 detects airflow (e.g., the user is smoking) through the airflow detection element 240, the system control unit 220 drives the first switching unit 210 to work, so that the heating element 250 continuously or intermittently heats the e-liquid to generate smoke. The smoke is delivered to the user's mouth through the mouthpiece to achieve the smoking effect.

[0058] The existing system control unit 220 generally drives the heating unit to heat in the following three ways, but it is not limited to these three driving methods and can also use other conventional driving methods.

[0059] 1. The system control unit 220 drives the heating element 250 to work via PWM (Pulse Width Modulation), specifically by driving the first switching unit 210 in PWM mode. In PWM mode, the frequency (period) remains constant, while the on-time and off-time of the first switching unit 210 are adjustable. In this mode, the first switching unit 210 is on during the on-time of one cycle and off during the off-time. This driving method enables constant power and constant voltage output from the electronic cigarette. When the electronic cigarette is not in use (e.g., when not smoking), the system control unit 220 stops driving the first switching unit 210, and the first switching unit 210 remains open; in this case, the first switching unit 210 is not in operation.

[0060] 2. The system control unit 220 drives the heating element 250 to work via PFM (Pulse Frequency Modulation), specifically by driving the first switching unit 210 to work via PFM. The frequency (cycle) of PFM is adjustable, while the on-time or off-time of the first switching unit 210 remains constant. In this mode, the first switching unit 210 is on during the on-time of one cycle and off during the off-time. This driving method enables constant power and constant voltage output from the electronic cigarette. When the electronic cigarette is not in use (e.g., when not smoking), the system control unit 220 stops driving the first switching unit 210, and the first switching unit 210 remains open; in this state, the first switching unit 210 is not in operation.

[0061] 3. The system control unit 220 drives the first switching unit 210 in a normally open, conductive manner. Specifically, when a user is detected smoking, the airflow detection element 240 is continuously triggered during the smoking period. During this triggered period, the first switching unit 210 remains open and does not turn off. This method is relatively simple to implement and has a low cost. When the electronic cigarette is not in use (e.g., when not smoking), the system control unit 220 stops driving the first switching unit 210, and the first switching unit 210 is deactivated, thus ceasing operation.

[0062] In this application, those skilled in the art can further add indicator elements, motors, etc., as needed. Indicator elements include, for example, LED lights, displays, etc., and these elements and motors are electrically connected to the system control module 272. Additionally, when the electronic cigarette has a charging function, the system control module 272 is electrically connected to the charging interface 260 via the charging terminal VCC. The system control module 272 includes a charging unit 230, which is electrically connected to the system control unit 220, the battery terminal BAT1, and the charging interface 260. The charging unit 230 is used to control the charging process and to provide a charging voltage and charging current that conform to the charging curve of the battery 110.

[0063] When a user smokes for an extended period (over-inhalation), such as more than 15 or 20 seconds, the airflow detection element is triggered during the smoking process. Alternatively, if the e-cigarette is being transported, the airflow detection element may be falsely triggered for an extended period (over-inhalation). This can cause the first switching unit 210 to operate for too long, resulting in an excessively high temperature rise in the first switching unit 210, potentially exceeding its maximum operating temperature, such as 150°C. This can reduce the lifespan or reliability of the first switching unit 210, and in severe cases, cause a short circuit or damage to the first switching unit 210. A short circuit or overheating of the first switching unit 210 can trigger a chain reaction, such as damaging the surrounding system control module 272.

[0064] To address the aforementioned issues, in this application, the system control unit 220 includes an airflow detection unit, a first timing unit, and a switch control unit. When the airflow detection unit detects a significant airflow through its airflow detection element—for example, by detecting microphone switch activation, microphone capacitance changes, or microphone capacitance frequency changes—and determines whether airflow is present, or whether it is significant, the first timing unit begins timing. Simultaneously, the switch control unit drives the first switch unit 210 to operate, and the heating element 250 heats the device, achieving e-liquid atomization. When the airflow detection unit detects a small or no airflow through its airflow detection element, the first timing unit stops timing, and the switch control unit stops driving the first switch unit 210, keeping it off. When the airflow detection unit detects a prolonged airflow duration through its airflow detection element, and the timing duration of the first timing unit is greater than or equal to a first preset duration, the system control unit 220 also forcibly stops driving the first switch unit 210, keeping it off, thus preventing the first switch unit 210 from overheating. In this application, the range of the first preset duration is, for example, 4s-15s, such as 4s, 5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, etc.

[0065] In this application, in order to compensate for the deficiencies of the above protection and prevent problems caused by the first switching unit 210 working for a long time or the first switching unit 210 stopping for a very short time before the heat is not dissipated and it starts working again, such as the first switching unit 210 becoming too hot, which in turn increases the internal temperature of the electronic cigarette. When the temperature continues to rise, the first switching unit 210, the system control module 272, etc. will deteriorate and be damaged. In severe cases, the electronic cigarette may catch fire, causing safety problems. The following describes specific embodiments to solve at least some of the above problems.

[0066] First Embodiment Generally, when the electronic cigarette is in normal operation, the second switch unit 140 is in the on / off state, allowing the battery 110 to discharge normally. At this time, the positive terminal of the battery 110, the system control circuit, the second switch unit 140, and the negative terminal of the battery 110 form the main discharge circuit. When the first switch unit 210 is off, the battery 110 supplies power to the system control module 272, the airflow detection element 240, etc., but does not supply power to the heating element 250. The discharge main circuit current formed by the battery 110, the second switch unit 140, and the system control module 272 is very small, typically at the microampere level, for example, several hundred microamperes, and is less than the first current threshold. When the first switch unit 210 is on, the battery 110 still needs to supply power to the heating element 250. The current in the circuit is relatively large, typically in the ampere range, such as 0.5A, 1A, or 2A. Consequently, the discharge main circuit current formed by the battery 110, the second switching unit 140, the first switching unit 210, the heating element 250, and the system control module 272 is also relatively large, exceeding the first current threshold. The resistance of the second switching unit 140 is generally fixed, in the milliohm range, for example, tens of milliohms. The voltage drop across the second switching unit 140 is the product of its resistance and the current flowing through it. In this embodiment, when the first switching unit 210 is off, the voltage drop across the second switching unit 140 is typically in the microvolt range; when the second switching unit 140 is on, the voltage drop across it is typically in the millivolt range. Therefore, by detecting the difference in voltage drop across the second switching unit 140, it can be determined whether the first switching unit 210 is conducting.

[0067] Specifically, when the second switching unit 140 is in the lower position, its first terminal is electrically connected to the negative terminal of the battery 110. Since the negative terminal of the battery 110 is grounded, the voltage at the second terminal of the second switching unit 140 is the voltage drop of the second switching unit 140. When the second switching unit 140 is in the upper position, its first terminal is electrically connected to the positive terminal of the battery 110. The voltage drop of the second switching unit 140 is the battery voltage minus the voltage at the system terminal VM. The battery voltage is approximately equal to the voltage at the power supply terminal VDD.

[0068] Please see Figure 2 and Figure 3a In this embodiment, the second switching unit 140 is externally mounted and located below the device. The battery protection module 130 in this embodiment includes a load detection unit, which obtains a first detection voltage. This first detection voltage corresponds to the current in the discharge main circuit where the second switching unit 140 is located. For example, the first detection voltage has a linear relationship with the current in the discharge main circuit, which can be expressed by the following formula: U = kI + b; Wherein, U represents the first detection voltage, I represents the current flowing through the second switching unit 140 in the main discharge circuit, k is a constant that is not equal to 0, and k can be positive or negative, and b is a constant. In this embodiment, k is positive and b is 0.

[0069] In this embodiment, the first detection voltage is linearly related to the voltage drop of the second switching unit 140. The load detection unit includes a system terminal VM, which is electrically connected to the second terminal of the second switching unit 140. The voltage drop of the second switching unit 140 is equal to the voltage of the system terminal VM minus the voltage of the second ground terminal GND2. Since the second ground terminal GND2 is electrically connected to the negative terminal of the battery (electrically grounded), and the first terminal of the second switching unit 140 is electrically connected to the negative terminal of the battery, the voltage drop of the second switching unit 140 is the voltage of the system terminal VM. Therefore, the voltage of the system terminal VM can be used to determine the first detection voltage. In this embodiment, the voltage of the system terminal VM is the first detection voltage, which is the voltage drop of the second switching unit 140. The ratio of the first detection voltage to the voltage drop of the second switching unit 140 is 1:1. Of course, in other embodiments, the voltage drop of the second switching unit 140 can be converted to obtain the first detection voltage. In this case, the ratio may not be 1:1, and can be set according to user needs. Additionally, for other embodiments of this application, please refer to... Figure 4 The second switching unit 140 is built-in and located at the bottom. In this configuration, the system terminal VM is electrically connected to the second terminal of the second switching unit 140. The second switching unit 140 is electrically connected to the system control circuit via the system terminal VM. The voltage of the system terminal VM can also be used to determine the first detection voltage; for example, the voltage of the system terminal VM can be used as the first detection voltage. In this embodiment, the system terminal VM is a terminal already present in the battery protection circuit 120, which helps reduce costs and eliminates the need to modify the overall circuit module of the electronic cigarette.

[0070] Please see Figure 3b and Figure 3cThe battery protection module 130 also includes a secondary over-absorption protection unit 160, which is electrically connected to the load detection unit and the logic control unit 150. In this embodiment, the secondary over-absorption protection unit 160 is electrically connected to the system terminal VM. In this embodiment, the secondary over-absorption protection unit 160 includes an over-absorption comparator unit 161, which is, for example, a voltage comparator. One input terminal of the over-absorption comparator unit 161 is electrically connected to the system terminal VM to receive a first detection voltage. The other input terminal of the over-absorption comparator unit 161 is electrically connected to a first reference voltage generation unit 138. The first reference voltage generation unit 138 generates a first reference voltage Vref1 and inputs it to the over-absorption comparator unit 161. The first reference voltage Vref1 is used to characterize a first current threshold, that is, when the current in the discharge main circuit is the first current threshold, the voltage of the system terminal VM is the first reference voltage Vref1. In this embodiment, when the first switching unit 210 is turned on, the current in the main discharge circuit is greater than the first current threshold, and the voltage of the system terminal VM is greater than the first reference voltage Vref1. When the first switching unit 210 is turned off, the current in the main discharge circuit is less than the first current threshold, and the voltage of the system terminal VM is less than the first reference voltage Vref1. At this time, the value of k in the above formula is positive, that is, the first current threshold is greater than the current flowing through the second switching unit 140 when the first switching unit 210 is turned off, and the first current threshold is less than the current flowing through the second switching unit 140 when the first switching unit 210 is turned on. Therefore, the first reference voltage Vref1 is greater than the product of the current flowing through the second switching unit 140 when the first switching unit 210 is turned off and the resistance of the second switching unit 140, and the first reference voltage Vref1 is less than the product of the current flowing through the second switching unit 140 when the first switching unit 210 is turned on and the resistance of the second switching unit 140, preferably near the middle value. In this embodiment, the first reference voltage Vref1 ranges from tens of microvolts to tens of millivolts, for example, 100uV, 200uV, 300uV, 400uV, 500uV, 600uV, 700uV, 800uV, 900uV, 1mV, 5mV, 10mV, 20mV, 30mV, 40mV, 50mV, etc. Those skilled in the art can set it according to actual needs. In this embodiment, those skilled in the art will easily understand that the first current threshold is not actually present, but the first reference voltage Vref1 is real and detectable; the first reference voltage Vref1 is used to characterize the first current threshold.

[0071] Please continue reading Figure 3bIn this embodiment, the logic control unit 150 includes an over-suction logic unit 152 and a battery logic unit 151. The battery logic unit 151 is electrically connected to the over-discharge voltage protection unit 131, the over-discharge current protection unit 134, the over-charge voltage protection unit 132, and the charging current protection unit 133, respectively. The battery logic unit 151 is also electrically connected to the control terminal of the second switching unit 140, and can control the second switching unit 140 to be turned on or off. The battery logic unit 151 is a circuit unit present in a conventional battery protection circuit 120. In this embodiment, the over-suction logic unit 152 is electrically connected to the secondary over-suction protection unit 160, specifically to the output terminal of the over-suction comparison unit 161. The over-suction logic unit 152 is also electrically connected to the control terminal of the second switching unit 140.

[0072] Please see Figure 3c In this embodiment, the oversinking logic unit 152 includes a second timing unit 171 and a second duration control unit 172. The input terminal of the second timing unit 171 is electrically connected to the output terminal of the oversinking comparison unit 161, and the output terminal of the second timing unit 171 is electrically connected to the second duration control unit 172. The output terminal of the second duration control unit 172 is electrically connected to the control terminal of the second switching unit 140. Additionally, to maintain the signal at the output terminal of the second duration control unit 172, the oversinking logic unit 152 may also include a trigger. One end of the trigger is electrically connected to the output terminal of the second duration control unit 172, and the other end is electrically connected to the control terminal of the second switching unit 140. Alternatively, a trigger may not be included.

[0073] In this embodiment, when there is airflow, the airflow detection element 240 is triggered, the first switching unit 210 is turned on, the current in the discharge main circuit is large, the voltage drop across the second switching unit 140 is relatively large, and the voltage at the system terminal VM is large. The over-sinking comparator unit 161 determines that the voltage at the system terminal VM is greater than the first reference voltage Vref1. At this time, the over-sinking comparator unit 161 outputs a first level signal, and the second timing unit 171 starts timing (edge-triggered or level-triggered). When there is no airflow (or when the PWM signal is at a low level or the PFM signal is at a low level), the airflow detection element 240 is triggered. At this time, the first switching unit 210 is turned off, the current in the discharge main circuit is small, the voltage drop across the second switching unit 140 is small, and the voltage at the system terminal VM is small. At this time, the over-sinking comparator 161 determines that the voltage at the system terminal VM is lower than the first reference voltage Vref1. The over-sinking comparator 161 outputs a second level signal, and the second timing unit 171 stops timing (edge-triggered or level-triggered) and sets the timing duration to zero. Thus, the second timing unit 171 can obtain the heating duration of the heating element 250 in real time and output it to the second duration control unit 172. In this embodiment, the first level signal is, for example, a high level or a low level, the second level signal is, for example, a low level or a high level, the edge trigger is, for example, a rising edge trigger or a falling edge trigger, and the level trigger is, for example, a high level trigger or a low level trigger.

[0074] When the first switching unit 210 is damaged, or the system control module 272 is partially damaged, or other problems occur, one possible fault scenario is that the first switching unit 210 remains continuously on and will not be turned off. This results in a large current in the main discharge circuit and a large voltage at the system terminal VM, exceeding the first reference voltage Vref1. In this case, the second timing unit 171 continues timing without stopping or resetting to zero. The second timing unit 171 outputs the timing duration to the second duration control unit 172 in real time. When the second duration control unit 172 learns that the duration of the first switching unit 210's conduction is greater than or equal to the specified value, the system control unit 171 will initiate a timeout. When the second preset duration is reached, the second duration control unit 172 outputs a secondary over-absorption protection signal to control the second switching unit 140 to remain open. When the second switching unit 140 is open, the main discharge circuit is disconnected. Even if the first switching unit 210 is still in operation and the battery 110 is still connected, it will not supply power to the system control circuit. Therefore, the heating element 250 will no longer heat up, and the temperature of the first switching unit 210 and its surroundings will not rise further. This prevents damage to the first switching unit 210 or the system control module 272 due to high temperatures, which could exacerbate damage to the electronic cigarette, and especially prevent fires. Furthermore, this embodiment utilizes the existing system terminal VM of the battery protection module 130, and the battery protection module 130 only requires minor modifications to its internal circuitry, resulting in lower costs. In this embodiment, the secondary over-absorption protection signal can be, for example, a shutdown signal, or a processed shutdown signal, as long as it can control the second switching unit 140 to shut down.

[0075] Please continue reading Figure 2 When the second switching unit 140 is turned off, the main discharge circuit is disconnected. Afterward, the voltage at the system terminal VM is the battery voltage 110. The over-absorption comparator 161 continuously outputs a first-level signal, causing the second timing unit 171 to continuously time. The second duration control unit 172 continuously outputs a secondary over-absorption protection signal to control the second switching unit 140 to remain off. Alternatively, in other embodiments of this application, when the second duration control unit 172 learns that the duration of the first switching unit 210's conduction is greater than or equal to a second preset duration, the second duration control unit 172 outputs a secondary over-absorption protection signal to turn off the second switching unit 140. Simultaneously, the second duration control unit 172 locks the output of the secondary over-absorption protection signal to the second switching unit 140 and controls the timing duration of the second timing unit 171 to be set to zero. In this embodiment, the secondary over-absorption protection signal can be a signal that turns off the second switching unit 140, or it can be a signal that triggers the circuit following the second duration control unit 172 to turn off the second switching unit 140.

[0076] After the user has troubleshooted and resolved the faults in the first switching unit 210 or the system control module 272, the voltage of the system-side VM can be pulled low to cause the over-extraction comparator 161 to output a second-level signal. This stops the second timing unit 171 from timing, resets it to zero, and outputs a signal to the second duration control unit 172. The second duration control unit 172 then outputs a conduction signal to the second switching unit 140, which then turns on to reactivate the system. In this embodiment, the system-side VM can be pulled low by connecting a charger. Alternatively, in other embodiments of this application, the second duration control unit 172 can be turned on using a combination of buttons or a physical switch to restore the second switching unit 140 to its active state and reactivate the system. Those skilled in the art can configure the system accordingly.

[0077] To prevent the secondary over-inhalation protection from being triggered before the primary over-inhalation protection of the e-cigarette is activated, thus avoiding user inconvenience (e.g., the e-cigarette needs to be activated to function properly after the secondary over-inhalation protection is triggered), in this embodiment, the second preset duration is longer than the first preset duration. This setting prevents the battery protection circuit 120 from activating before the system control module 272 has activated its protection, thus affecting normal user operation. In other words, the secondary over-inhalation protection will only be triggered when the primary over-inhalation protection in the system control module 272 fails or is damaged. In this embodiment, the second preset duration is, for example, 10% longer than the first preset duration, such as 5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, 16s, 17s, 18s, 19s, or 20s. Preferably, the ratio of the second preset duration to the first preset duration is between 1.1 and 2. Setting an upper limit for this ratio can prevent the secondary over-inhalation protection from lagging behind, which could exacerbate damage to the e-cigarette and reduce the effectiveness of the secondary over-inhalation protection.

[0078] Please continue reading Figure 3cIn this embodiment, the second timing unit 171 includes a first reference frequency generating unit 174 and a second timing subunit 173. The first reference frequency generating unit 174 is electrically connected to the second timing subunit 173. One end of the second timing subunit 173 is electrically connected to the output terminal of the over-sucking comparison unit 161, and the other end of the second timing subunit 173 is electrically connected to the second duration control unit 172. In one embodiment of this application, the second timing subunit 173 counts the number of cycles of the first reference frequency generating unit 174, and the product of the count and the frequency cycle is the duration. In another embodiment of this application, the second timing subunit 173 can also use the number of cycles obtained by counting to represent the duration, or other conventional methods to represent the duration. In this embodiment, the second timing subunit 173 starts timing by an edge trigger or a level trigger, and stops timing and sets the timing duration to zero by another edge trigger or another level trigger. Edge triggering is, for example, rising edge triggering or falling edge triggering, and level triggering is, for example, high level triggering or low level triggering. In this embodiment, the first reference frequency generating unit 174 can be shared with other units in the system control module 272, which can save costs. The first reference frequency generating unit 174 is, for example, an oscillator.

[0079] In this embodiment, the first reference frequency generating unit 174 of the second timing unit 171 needs to operate continuously, regardless of whether the electronic cigarette is working or not, resulting in high energy consumption. To save energy, please refer to other embodiments of this application. Figure 3dThe second timing unit 171 includes a second reference frequency generating unit 178 and a second timing subunit 173. The second reference frequency generating unit 178 is located between the second timing subunit 173 and the over-extraction comparator unit 161. Specifically, the input terminal of the second reference frequency generating unit 178 is electrically connected to the output terminal of the over-extraction comparator unit 161, and the output terminal of the second reference frequency generating unit 178 is electrically connected to the second timing subunit 173. The second reference frequency generating unit 178 generates a frequency signal by triggering one edge or one level, and stops generating a frequency signal by triggering another edge or another level, thereby reducing power consumption. Specifically, the secondary over-absorption protection unit 160 determines whether the voltage of the system terminal VM is greater than the first reference voltage Vref1. When the voltage of the system terminal VM changes from below the first reference voltage Vref1 to above the first reference voltage Vref1, the output level signal of the over-absorption comparator unit 161 changes. The second reference frequency generation unit 178 is triggered to generate a frequency signal upon receiving an edge signal or a changed level signal. The second timing subunit 173 starts timing according to the received frequency signal and outputs the real-time duration to the second duration control unit 172. When the voltage of the system terminal VM changes from above the first reference voltage Vref1 to below the first reference voltage Vref1, the output level signal of the over-absorption comparator unit 161 changes again. The second reference frequency generation unit 178 stops generating a frequency signal upon receiving another edge signal or a changed level signal, and the second timing unit 171 stops timing and resets the timing duration to 0. The relationship between the second duration control unit 172 and the second switching unit 140 is as follows... Figure 3b Similarly, this will not be repeated here. In this embodiment, the second timing subunit 173 and the second duration control unit 172 can be implemented in one circuit module, or they can be implemented separately.

[0080] In this embodiment, the second preset duration is adjustable. Specific adjustable methods include, but are not limited to, the following three. Those skilled in the art can design other conventional duration-adjustable circuits according to actual needs. In other embodiments of this application, the second preset duration may also be non-adjustable.

[0081] 1. Please see Figure 3eThe first reference frequency generating unit 174 or the second reference frequency generating unit 178 includes a frequency comparator 331, a frequency switching unit PK1, a first current source 310, and a frequency capacitor terminal (pin) PC. The first terminal of the first current source 310 is electrically connected to the power supply terminal VDD. The second terminal of the first current source 310 is electrically connected to the first terminal of the frequency switching unit PK1, one input terminal of the frequency comparator 331, and the frequency capacitor terminal PC. The other input terminal of the frequency comparator 331 is connected to a preset first frequency reference voltage. The output terminal of the frequency comparator 331 is electrically connected to the control terminal of the frequency switching unit PK1. The second terminal of the frequency switching unit PK1 is electrically connected to the second ground terminal. The frequency capacitor terminal PC is used to electrically connect to one end of the frequency capacitor C2, and the other end of the frequency capacitor C2 is grounded. Figure 3e The working principle of generating frequency or period is conventional technology in this field and will not be elaborated here. The frequency period of the first reference frequency generating unit 174 or the second reference frequency generating unit 178 is linearly related to the capacitance value of the capacitor, and the period is also linearly related to the second preset duration. Therefore, the second preset duration is proportional to the capacitance value of the frequency capacitor. The parameter values ​​of the first reference frequency generating unit 174 or the second reference frequency generating unit 178 are determined after the chip is manufactured. Thus, by changing the capacitance of the frequency capacitor C2, the second preset duration can be changed. Here, the frequency capacitor C2 is external, that is, not located on the battery protection chip. By electrically connecting the frequency capacitor terminal PC to frequency capacitors C2 with different capacitances, different second preset durations can be obtained, realizing the adjustment of the second preset duration. In other embodiments, the first reference frequency generating unit 174 or the second reference frequency generating unit 178 further includes a first frequency capacitor C2. A second frequency capacitor C2 can be externally connected through the frequency capacitor terminal PC. In this case, the first frequency capacitor C2 and the second frequency capacitor C2 are connected in parallel. When the frequency capacitor terminal PC is floating, the second preset duration is determined by the built-in first frequency capacitor C2. When the frequency capacitor terminal PC is externally connected to a second frequency capacitor C2 with a different capacitance value, the second preset duration is jointly determined by the first frequency capacitor C2 and the second frequency capacitor C2. The second preset duration is adjustable.

[0082] 2. Please see Figure 3fThe first reference frequency generating unit 174 or the second reference frequency generating unit 178 includes a frequency comparator 331, a frequency operational amplifier 332, a frequency switching unit PK1, a first current source 310, a second current source 320, a frequency capacitor C2, and a frequency resistor terminal (pin) PR. The first current source 310 includes a first frequency MOSFET PM1, and the second current source 320 includes a second frequency MOSFET PM2. In this configuration, the sources of the first frequency MOSFET PM1 and the second frequency MOSFET PM2 are both electrically connected to the power supply terminal VDD. The gates of the first frequency MOSFET PM1 and the second frequency MOSFET PM2 are electrically connected and together connected to the output terminal of the frequency operational amplifier 332. One input terminal of the frequency operational amplifier 332 is connected to a preset second frequency reference voltage, and the other input terminal of the frequency operational amplifier 332 is electrically connected to the drain of the second frequency MOSFET PM2. The drain of the second frequency MOSFET PM2 is also electrically connected to the frequency resistor terminal PR. The drain of the first frequency MOSFET PM1 is electrically connected to the first terminal of the frequency switching unit PK1, one input terminal of the frequency comparator 331, and the first terminal of the frequency capacitor C2. The other input terminal of the frequency comparator 331 is connected to the preset first frequency reference voltage. The output terminal of the frequency comparator 331 is electrically connected to the control terminal of the frequency switching unit PK1. The second terminal of the frequency switching unit PK1 is grounded, the second terminal of the frequency capacitor C2 is grounded, and the frequency resistor terminal PR is used to electrically connect to the first terminal of the frequency resistor R2, the second terminal of the frequency resistor R2 is grounded. Figure 3fThe working principle of frequency generation is conventional technology in this field and will not be elaborated here. In this embodiment, the frequency generated by the first reference frequency generating unit 174 or the second reference frequency generating unit 178 is linearly related to the current flowing through the capacitor, the period is the reciprocal of the frequency, and the period is linearly related to the second preset duration. Therefore, the second preset duration is proportional to the resistance value of the frequency resistor. The parameters of the first reference frequency generating unit 174 or the second reference frequency generating unit 178 are determined after the chip is manufactured. Thus, the current flowing through the capacitor is determined by the frequency resistor R2. Therefore, by changing the resistance value of the frequency resistor R2, the second preset duration can be changed. Here, the frequency resistor R2 is external. By connecting the frequency resistor terminal PR to the frequency resistor R2 with different resistance values, different second preset durations can be obtained, realizing the adjustment of the second preset duration. Here, the first current source 310 and the second current source 320 constitute a mirror current source, a proportional current source, etc. In addition, the first reference frequency generating unit 174 or the second reference frequency generating unit 178 also includes a first frequency resistor R2. A second frequency resistor R2 can be externally connected through the frequency resistor terminal PR. At this time, the first frequency resistor R2 and the second frequency resistor R2 are set in parallel. When the frequency resistor terminal PR is floating, the second preset duration is determined by the first frequency resistor R2. When the frequency resistor terminal PR is externally connected to the second frequency resistor R2 with different resistance values, the second preset duration is jointly determined by the first frequency resistor R2 and the second frequency resistor R2. The second preset duration is adjustable.

[0083] 3. The output current to the frequency capacitor C2 can also be adjusted by using a microcontroller or by using multiple built-in current sources with different current values ​​to adjust the second preset duration.

[0084] In this embodiment, by setting a second preset duration that is adjustable, when electronic cigarettes with different first preset durations use the battery protection circuit of this application, only the second preset duration needs to be adjusted to easily meet the requirement that the second preset duration is longer than the first preset duration, without the need to design a new battery protection circuit, thus exhibiting strong compatibility. Moreover, different users, different brands, and different manufacturers have different requirements for the second preset duration. By designing a second preset duration that is adjustable, the requirements of different users, different brands, and different manufacturers can be met, thereby improving the duration competitiveness of the battery protection circuit.

[0085] Additionally, in the embodiments, please continue to refer to... Figure 3bThe logic control unit 150 also includes a logic gate circuit 153. One input terminal of the logic gate circuit 153 is electrically connected to the battery logic unit 151, and the other input terminal is electrically connected to the over-absorption logic unit 152. Specifically, it is electrically connected to the output terminal of the second duration control unit 172. The output terminal of the logic gate circuit 153 is electrically connected to the control terminal of the second switching unit 140. In this embodiment, the logic gate circuit 153 includes an AND gate. In other embodiments of this application, the logic gate circuit 153 can also be a combination of AND gates and NOT gates, OR gates and NOT gates, or a combination of AND gates, OR gates, and NOT gates to achieve the desired control signal. The NOT gate can be located before or after the AND gates and OR gates, and the number of NOT gates, AND gates, and OR gates can be one or more, which can be set according to actual needs by those skilled in the art. This embodiment, by adding the logic gate circuit 153, does not require modification of the original battery logic unit 151, greatly reducing the design difficulty. In this embodiment, when logic gate 153 receives any signal to turn off the second switching unit 140, logic gate 153 controls the second switching unit 140 to turn off; when both battery logic unit 151 and over-suction logic unit 152 output signals to turn on the second switching unit 140, logic gate 153 controls the second switching unit 140 to turn on. Under normal conditions, both battery logic unit 151 and over-suction logic unit 152 output signals to turn on the second switching unit 140.

[0086] Second Embodiment Please see Figure 5 , Figure 5 This is a circuit block diagram of an electronic cigarette according to the second embodiment of this application. This embodiment is similar to the first embodiment. Therefore, the parts not described in this embodiment can be referred to the first embodiment. The main difference between this embodiment and the first embodiment is that the second switch unit 140 is located on top.

[0087] Please see Figure 5 In this embodiment, the second switching unit 140 is externally mounted and positioned on top of the device. Please refer to [reference needed]. Figure 5 and Figure 3a In this embodiment, the battery protection module 130 includes a load detection unit, which is used to obtain a first detection voltage. The first detection voltage corresponds to the current in the discharge main circuit where the first switching unit 210 is located. For example, the first detection voltage has a linear relationship with the current in the discharge main circuit, which can be expressed by the following formula: U = kI + b; Wherein, U represents the first detection voltage, I represents the current flowing through the second switching unit 140 in the main discharge circuit, k is a constant that is not equal to 0, and k can be positive or negative, b is a constant, and in this embodiment k is negative and b is the voltage of battery 110.

[0088] In this embodiment, the first detection voltage is linearly related to the voltage drop of the second switching unit 140. The load detection unit includes a system terminal VM, which is electrically connected to the second terminal of the second switching unit 140. The voltage drop of the second switching unit 140 is the current flowing through it multiplied by its resistance, or the battery voltage minus the voltage of the system terminal VM. The battery voltage is almost equal to the voltage of the power supply terminal VDD. Therefore, the voltage drop of the second switching unit is obtained by subtracting the voltage of the system terminal VM from the voltage of the power supply terminal VDD. The voltage drop of the second switching unit 140 is linearly related to the current in the discharge main circuit. The voltage drop of the second switching unit 140 can be used to determine the first detection voltage. In this embodiment, the first detection voltage is the voltage drop of the second switching unit 140, which is the voltage of the power supply terminal VDD minus the voltage of the system terminal VM. Of course, in other embodiments, the voltage drop of the second switching unit 140 can be converted to obtain the first detection voltage. For other embodiments of this application, please refer to... Figure 6 The second switching unit 140 is built-in and positioned on top. The system terminal VM is electrically connected to the second terminal of the second switching unit 140, and the second switching unit 140 is electrically connected to the system control circuit via the system terminal VM. In this embodiment, the system terminal VM is a terminal already present in the battery protection circuit 120, which helps reduce costs and eliminates the need to modify the overall circuit module of the electronic cigarette.

[0089] Please refer to the above. Figure 5 , Figure 3b and Figure 3cIn this embodiment, the battery protection module 130 further includes a secondary over-absorption protection unit 160, which is electrically connected to the load detection unit and the logic control unit 150, respectively. In this embodiment, the secondary over-absorption protection unit 160 includes an over-absorption comparator unit 161, which is, for example, a voltage comparator. One input terminal of the over-absorption comparator unit 161 is used to connect to a first detection voltage, and the other input terminal is electrically connected to a first reference voltage generation unit 138. The first reference voltage generation unit 138 generates a first reference voltage Vref1 and inputs it to the over-absorption comparator unit 161. The first reference voltage Vref1 is used to characterize a first current threshold, that is, when the current in the main discharge circuit is the first current threshold, the voltage drop of the second switching unit is the first reference voltage Vref1. In this embodiment, when the first switching unit 210 is turned on, the current in the main discharge circuit is greater than the first current threshold, and the voltage drop of the second switching unit 140 is relatively large, exceeding the first reference voltage Vref1. When the first switching unit 210 is turned off, the current in the main discharge circuit is less than the first current threshold, and the voltage drop of the second switching unit 140 is relatively small, less than the first reference voltage Vref1. In this embodiment, the first current threshold is greater than the current flowing through the second switching unit 140 when the first switching unit 210 is turned off, and less than the current flowing through the second switching unit 140 when the first switching unit 210 is turned on. Therefore, the first reference voltage Vref1 is greater than the voltage drop of the second switching unit 140 when the first switching unit 210 is turned off, and less than the voltage drop of the second switching unit 140 when the first switching unit 210 is turned on, preferably near the middle value. In this embodiment, the range of the first reference voltage Vref1 is between tens of microvolts and tens of millivolts. Furthermore, in this embodiment, determining whether the first switching unit 210 is turned on by judging the voltage drop of the second switching unit 140 can eliminate the influence caused by voltage changes in the battery 110. Additionally, in other embodiments of this application, the first detection voltage can also be determined by the voltage of the system-side VM.

[0090] Please continue reading Figure 3b In this embodiment, the logic control unit 150 includes an over-suction logic unit 152 and a battery logic unit 151. For a detailed description, please refer to the first embodiment, which will not be repeated here.

[0091] Please continue reading Figure 5When the second switching unit 140 is turned off, the main discharge circuit is disconnected, and the system terminal VM is then grounded. Therefore, the first detected voltage is the battery voltage, meaning the voltage drop across the second switching unit 140 is the battery voltage, which is greater than the first reference voltage Vref1. The over-absorption comparator 161 continuously outputs a first-level signal, causing the second timing unit 171 to continuously time. The second duration control unit 172 continuously outputs a secondary over-absorption protection signal to control the second switching unit 140 to remain off. In other embodiments of this application, when the second duration control unit 172 learns that the duration of the first switching unit 210's conduction is greater than or equal to a second preset duration, the second duration control unit 172 outputs a secondary over-absorption protection signal to turn off the second switching unit 140. Simultaneously, the second duration control unit 172 locks the output of the secondary over-absorption protection signal to the second switching unit 140 and controls the timing duration of the second timing unit 171 to be set to zero. In this embodiment, the secondary over-sucking protection signal can be a signal that shuts off the second switching unit 140, or it can be a signal that triggers the circuit following the second duration control unit 172 to shut off the second switching unit 140.

[0092] After the user has troubleshooted and resolved the faults in the first switching unit 210 or the system control module 272, the voltage of the system-side VM can be pulled high to make the first detection voltage less than the first reference voltage Vref1. The over-sucking comparator unit 161 outputs a second-level signal, causing the second timing unit 171 to stop timing. The second timing unit 171 is then reset and outputs a signal to the second duration control unit 172. The second duration control unit 172 outputs a conduction signal to the second switching unit 140, which then turns on to reactivate the system. In this embodiment, the system-side VM can be pulled high by connecting a charger. Alternatively, in other embodiments of this application, the second duration control unit 172 can be turned on via a combination of buttons or a physical switch to restore the second switching unit 140 to its active state and reactivate the system. Those skilled in the art can configure the system accordingly.

[0093] To prevent the secondary over-inhalation protection from being triggered before the primary over-inhalation protection of the e-cigarette is activated, thus avoiding user inconvenience (e.g., the e-cigarette needs to be activated to function properly after the secondary over-inhalation protection is triggered), in this embodiment, the second preset duration is longer than the first preset duration. This setting prevents the battery protection circuit 120 from activating before the system control module 272 has activated its protection, thus affecting normal user operation. In other words, the secondary over-inhalation protection will only be triggered when the primary over-inhalation protection in the system control module 272 fails or is damaged. In this embodiment, the second preset duration is, for example, 10% longer than the first preset duration, such as 5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, 16s, 17s, 18s, 19s, or 20s. Preferably, the ratio of the second preset duration to the first preset duration is between 1.1 and 2. Setting an upper limit for this ratio can prevent the secondary over-inhalation protection from lagging behind, which could exacerbate damage to the e-cigarette and reduce the effectiveness of the secondary over-inhalation protection.

[0094] Please continue reading Figure 3c In this embodiment, the second timing unit 171 includes a first reference frequency generating unit 174 and a second timing subunit 173, or includes a second reference frequency generating unit 178 and a second timing subunit 173. These have been described in the first embodiment and will not be repeated here.

[0095] In this embodiment, the second preset duration is adjustable. For the specific adjustment method, please refer to the first embodiment, which will not be repeated here.

[0096] Third Embodiment Please see Figure 7 , Figure 7 This is a partial circuit block diagram of the battery protection circuit 120 according to the third embodiment of this application. This embodiment is similar to the first and second embodiments. Therefore, the parts not described in this embodiment can be referred to the first and second embodiments. The main difference between this embodiment and the first and second embodiments is the logic control unit 150.

[0097] Please see Figure 7In this embodiment, the logic control unit 150 includes an over-suction logic unit 152 and a battery logic unit 151. The battery logic unit 151 is electrically connected to the over-discharge voltage protection unit 131, the discharge overcurrent protection unit 134, the overcharge voltage protection unit 132, and the charging overcurrent protection unit 133, respectively. That is, the battery logic unit 151 is a conventional logic control unit 150 with a sleep mode. The battery logic unit 151 is also electrically connected to the control terminal of the second switching unit 140, and can control the second switching unit 140 to turn on or off. In this embodiment, the over-suction logic unit 152 is electrically connected to the secondary over-suction protection unit 160, specifically to the output terminal of the over-suction comparison unit 161. In this embodiment, the output terminal of the over-suction logic unit 152 is electrically connected to the battery logic unit 151 or the over-discharge voltage protection unit 131, and the battery logic unit 151 is electrically connected to the control terminal of the second switching unit 140.

[0098] Please refer to the above. Figure 7 , Figure 3c , Figure 3d In this embodiment, the over-absorption logic unit 152 includes a second timing unit 171 and a second duration control unit 172. The input terminal of the second timing unit 171 is electrically connected to the output terminal of the over-absorption comparison unit 161, the output terminal of the second timing unit 171 is electrically connected to the second duration control unit 172, and the output terminal of the second duration control unit 172 is electrically connected to the battery logic unit 151 or the over-discharge voltage protection unit 131.

[0099] In this embodiment, when the second duration control unit 172 learns that the duration of the first switch unit 210 being on is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151 or outputs an over-discharge signal to the over-discharge voltage protection unit 131. Upon receiving the over-discharge signal, the over-discharge voltage protection unit 131 outputs a sleep signal to the battery logic unit 151. The battery logic unit 151 controls the battery protection circuit 120 to enter sleep mode and simultaneously controls the second timing unit 171 to reset to zero. In sleep mode, the second switch unit 140 remains off so that the battery 110 stops supplying power to the atomizing assembly 200. Preferably, in this embodiment, in sleep mode, at least some units of the battery protection module 130 do not consume power (excluding leakage current). For example, at least one of the following does not consume power: the overcharge voltage protection unit 132, the over-discharge voltage protection unit 131, the discharge overcurrent protection unit 134, the logic control unit 150, and the first reference voltage generation unit 138. Preferably, the entire battery protection module 130 consumes no power in sleep mode (leaking current is not considered, and it will not automatically exit sleep mode). How the battery logic unit 151 enters sleep mode after receiving a sleep signal is a conventional technique in the art and will not be described further here. In this manner, the battery protection module 130 includes a charging detection unit 139, which is electrically connected to the system-side VM and the logic control unit 150. When the electronic cigarette is connected to the charger via the charging interface 260, the system-side VM voltage is either pulled down (second switch unit 140 is lowered) or pulled up (second switch unit 140 is higher). The charging detection unit 139 detects the charging signal, the battery protection circuit 120 can exit sleep mode, and the second switch unit 140 resumes conduction.

[0100] Fourth embodiment In the first to third embodiments, when the system control unit 220 drives the first switching unit 210 to work via PWM or PFM, and the PWM and PFM methods include an on-time and an off-time in one cycle, the first switching unit 210 is turned on during the on-time and turned off during the off-time. Since there is only one second timing unit 171, the second timing unit 171 may encounter problems when timing the operation of the first switching unit 210 (it will reset to zero during the off-time). In this case, the secondary over-inhalation protection mechanism of the above three embodiments is no longer applicable. For example, if the primary over-inhalation protection fails or is damaged, and prolonged airflow causes the system control unit 220 to continuously drive the first switching unit 210, it cannot provide effective secondary protection for the electronic cigarette. To completely solve this problem, this application provides a fourth embodiment. For parts not described in this application, please refer to the first to third embodiments.

[0101] In this embodiment, the first switching unit 210 can be driven by either PWM or PFM. Please refer to [link to relevant documentation]. Figure 8 In this embodiment, the over-absorption logic unit 152 includes a second timing unit 171, a second duration control unit 172, a third timing unit 175, and a third duration control unit 176. The input terminals of the second timing unit 171 and the third timing unit 175 are electrically connected to the output terminal of the over-absorption comparison unit 161, respectively. The output terminal of the second timing unit 171 is electrically connected to the second duration control unit 172. The output terminal of the second duration control unit 172 is electrically connected to the control terminal of the second switching unit 140, or to the battery logic unit 151, or to the over-discharge voltage protection unit 131. The output terminal of the third timing unit 175 is electrically connected to the third duration control unit 176, and the output terminal of the third duration control unit 176 is electrically connected to the second timing unit 171. In this embodiment, the second timing unit 171 is triggered by a first edge or a first level, the third timing unit 175 is triggered by a second edge or a second level, and the third timing unit 175 stops timing by the first edge or the first level. The third duration control unit 176 controls whether the second timing unit 171 stops timing.

[0102] Specifically, in this embodiment, when there is airflow, the airflow detection element 240 is triggered, and the system control unit 220 drives the first switching unit 210 to work through a PWM signal or a PFM signal. In one cycle, the PWM signal or PFM signal includes the on time and the off time. When the turn-on period is reached, the first switch unit 210 is turned on, and the secondary over-suction protection unit 160 determines that the first detection voltage is greater than the first reference voltage Vref1 (taking the lower setting of the second switch unit 140 as an example). At this time, the over-suction comparison unit 161 outputs a first level signal, and the second timing unit 171 starts timing. The second timing unit 171 outputs the timing duration to the second duration control unit 172. When the turn-off period is reached, the secondary over-suction protection unit 160 determines that the first detection voltage is lower than the first reference voltage Vref1. At this time, the over-suction comparison unit 161 outputs a second level signal, and the third timing unit 175 starts timing. The third timing unit 175 outputs the timing duration to the third duration control unit 176. When the turn-on period of the next cycle is reached, the third timing unit 175 receives the first level signal output by the secondary over-suction protection unit 160 and triggers the stop timing. That is, the third timing unit 175 is used to time the turn-off period or the period when the first switch unit 210 is not working. When the third duration control unit 176 receives a duration from the third timing unit 175 that is greater than or equal to the third preset duration, it indicates that the first switch unit 210 is in a non-working state, that is, the signal received at this time is not a PWM signal or a PFM signal. The third duration control unit 176 outputs a reset signal to the second timing unit 171, and the second timing unit 171 stops timing and resets the timing duration to zero. When the third duration control unit 176 receives a duration from the third timing unit 175 that is less than the third preset duration, it indicates that the first switch unit 210 is still driven by the PWM signal or the PFM signal, but is in the off time during this period. The third duration control unit 176 does not output a reset signal to the second timing unit 171, and the second timing unit 171 accumulates the timing. When the second duration control unit 172 detects that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary over-absorption protection signal to control the second switching unit 140 to remain open. When the second switching unit 140 is open, the discharge main circuit is disconnected. Even if the first switching unit 210 is still in operation, the battery 110 will not supply power to the system control circuit, thus the heating element 250 will no longer heat up, and the temperature of the first switching unit 210 and its surroundings will not rise further. This can prevent the first switching unit 210 or the system control module 272 from being damaged due to high temperature, which could lead to further damage to the electronic cigarette, and especially prevent a fire. Moreover, this embodiment utilizes the existing system terminal VM of the battery protection module 130, and the battery protection module 130 only requires minor modifications to its internal circuitry, thus keeping costs low.

[0103] After the second switching unit 140 is turned off, the voltage of the system terminal VM becomes the voltage of battery 110, and the first detection voltage also becomes the voltage of battery 110. The over-suction comparison unit 161 continuously outputs the first level signal, so the duration of the third timing unit 175 is 0. The third duration control unit 176 receives that the duration of the third timing unit 175 is always less than the third preset duration, so the third duration control unit 176 does not output a reset signal to the second timing unit 171, and the second timing unit 171 continues to accumulate time. The second duration control unit 172 continuously outputs a secondary over-suction protection signal to control the second switching unit 140 to remain off. In addition, in other embodiments of this application, when the second duration control unit 172 knows that the duration of the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151, or outputs an over-discharge signal to the over-discharge voltage protection unit 131, and the battery protection circuit 120 enters sleep mode. For details, please refer to the third embodiment, which will not be repeated here. In addition, in other embodiments of this application, when the second switch unit 140 is on, the corresponding modifications can be made by referring to the second embodiment.

[0104] In this embodiment, after the user has troubleshooted the first switch unit 210 or the system control module 272, the voltage of the system-side VM can be pulled low to cause the over-sucking comparator unit 161 to output a second-level signal. When the third duration control unit 176 receives a duration greater than or equal to a third preset duration from the third timing unit 175, the third duration control unit 176 outputs a reset signal to the second timing unit 171. The second timing unit 171 resets the timing duration to zero and outputs it to the second duration control unit 172. The second duration control unit 172 outputs a conduction signal to the second switch unit 140, and the second switch unit 140 resumes conduction to achieve reactivation. In this embodiment, the system-side VM can be pulled low by connecting a charger. In other embodiments of this application, the second duration control unit 172 can also output a conduction signal through a combination of buttons, a physical switch, etc., to cause the second switch unit 140 to resume conduction and achieve reactivation. Those skilled in the art can make settings according to actual conditions.

[0105] In this embodiment, the third preset duration is greater than the maximum period of the PWM signal and the PFM signal. For example, the third preset duration is greater than or equal to 60ms, such as 60ms, 70ms, 80ms, 90ms, 100ms, 110ms, 120ms, 130ms, 140ms, 150ms, etc. This embodiment can solve various problems caused by damage to the first switching unit 210 and the system control module 272.

[0106] The solution to the above problems in this embodiment can be applied to various (including but not limited to the three methods mentioned above) ways in which the system control module 272 drives the first switching unit 210. Specifically, when the system control unit 220 drives the heating element 250 to heat in the third way (for the first and second driving methods, please refer to the previous description of this embodiment), the third timing unit 175 does not start timing, and the timing duration is always 0. The third duration control unit 176 does not output a reset signal to the second timing unit 171 (the third duration control unit 176 only outputs a reset signal when the first driving unit is not working). The second timing unit 171 continues to accumulate timing. When the second duration control unit 172 learns that the timing duration of the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary over-suction protection signal to turn off the second switching unit 140, or outputs a sleep signal to the battery logic unit 151, or outputs an over-discharge signal to the over-discharge voltage protection unit 131.

[0107] In this embodiment, when the airflow detection is repeatedly and falsely triggered, as long as the interval is less than the third preset duration, the second timing unit will keep timing. When the timing duration of the second timing unit is greater than or equal to the second preset duration, the secondary over-suction protection will be triggered. This can also prevent the problem of the first switching unit temperature continuously rising due to the heat not being dissipated in time and the smoke being drawn again.

[0108] Please continue reading Figure 8In this embodiment, the second timing unit 171 includes a first reference frequency generating unit 174 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177. The second timing unit 171 and the third timing unit 175 share a first reference frequency generating unit 174, which can reduce costs. The second timing subunit 173 and the third timing subunit 177 are electrically connected to the output terminal of the secondary over-absorption protection unit 160, and in this embodiment, are electrically connected to the output terminal of the over-absorption comparison unit 161. The second timing subunit 173 is also electrically connected to the second duration control unit 172 and the first reference frequency generating unit 174, and the third timing subunit 177 is also electrically connected to the third duration control unit 176 and the first reference frequency generating unit 174, respectively. The third duration control unit 176 is electrically connected to the second timing subunit 173. In this embodiment, the first reference frequency generating unit 174 is always operational. When the first switching unit 210 is turned on, the second timing subunit 173 is triggered to receive the frequency signal output by the first reference frequency generating unit 174. The frequency signal may be, for example, a pulse signal, a sawtooth wave signal, or a triangular wave signal. The second timing subunit 173 begins timing. When the first switching unit 210 is turned off, the third timing subunit 177 is triggered to receive the frequency signal output by the first reference frequency generating unit 174. The third timing subunit 177 begins timing. When the first switching unit 210 is turned on again, the third timing subunit 177 begins timing. The timing subunit 177 stops receiving the frequency signal output by the first reference frequency generating unit 174, and the third timing subunit 177 stops timing and resets to zero. When the third duration control unit 176 receives a duration counted by the third timing subunit 177 that is greater than or equal to a third preset duration, the third duration control unit 176 outputs a reset signal to the second timing subunit 173, and the second timing subunit 173 resets to zero. When the third duration control unit 176 receives a duration counted by the third timing subunit 177 that is less than the third preset duration, the third timing subunit 177 does not output a reset signal. Alternatively, in other embodiments of this application, the second timing unit 171 and the third timing unit 175 may not share the first reference frequency generating unit 174, and each may have its own first reference frequency generating unit 174. In this embodiment, the second timing subunit 173 and the second duration control unit 172 can be implemented in one circuit module or separately. The third timing subunit 177 and the third duration control unit 176 can be implemented in one circuit module or separately. The second timing subunit 173, the second duration control unit 172, the third timing subunit 177 and the third duration control unit 176 can also be implemented in one circuit module.

[0109] In this embodiment, the first reference frequency generating unit 174 operates continuously regardless of whether the electronic cigarette is working or not, resulting in high energy consumption. To save energy, please refer to other embodiments of this application. Figure 9The second timing unit 171 includes a second reference frequency generating unit 178 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177. The second timing unit 171 and the third timing unit 175 share a second reference frequency generating unit 178, which reduces costs. The second reference frequency generating unit 178 and the third timing subunit 177 are electrically connected to the output terminals of the secondary over-extraction protection unit 160 and, at this point, to the output terminal of the over-extraction comparison unit 161. The second timing subunit 173 and the third timing subunit 177 are electrically connected to the second reference frequency generating unit 178. The second timing subunit 173 is electrically connected to the second duration control unit 172, and the third timing subunit 177 is electrically connected to the third duration control unit 176. The third duration control unit 176 is electrically connected to both the second reference frequency generating unit 178 and the second timing subunit 173. In this embodiment, the second reference frequency generating unit 178 operates when the first switch unit 210 is working, and stops operating and does not generate a frequency signal after a delay when the first switch unit 210 is not working. This setting can save energy. In this embodiment, when the first switch unit 210 is turned on, the second reference frequency generating unit 178 is triggered to output a frequency signal, and the second timing subunit 173 receives the frequency signal and starts timing. When the first switch unit 210 is turned off, the third timing subunit 177 is triggered to receive the frequency signal output by the second reference frequency generating unit 178, and the third timing subunit 177 starts timing. When the first switch unit 210 is turned on again, the third timing subunit 177 stops receiving the frequency signal output by the second reference frequency generating unit 178, stops timing, and resets to zero. When the control unit 176 receives a timeout value from the third timing subunit 177 that is greater than or equal to a third preset timeout value, it indicates that the electronic cigarette is no longer working. The third timeout control unit 176 outputs a reset signal to the second timing subunit 173 and the second reference frequency generating unit 178. The second reference frequency generating unit 178 stops working and stops generating frequency signals. At the same time, the second timing subunit 173 is reset to zero. When the third timeout control unit 176 receives a timeout value from the third timing subunit 177 that is less than the third preset timeout value, the third timing subunit 177 does not output a reset signal.In other embodiments of this application, the third duration control unit 176 may also be electrically connected to the second reference frequency generating unit 178, but not electrically connected to the second timing subunit 173. In this case, when the third duration control unit 176 receives a duration greater than or equal to the third preset duration from the third timing subunit 177, it indicates that the electronic cigarette is no longer working. The third duration control unit 176 outputs a reset signal to the second reference frequency generating unit 178, and the second reference frequency generating unit 178 stops working and stops generating frequency signals. The second timing subunit 173 does not receive frequency signals and automatically resets to zero. Furthermore, in other embodiments of this application, the second timing unit 171 and the third timing unit 175 may not share the second reference frequency generating unit 178; each may have its own second reference frequency generating unit 178. In this embodiment, the second timing subunit 173 and the second duration control unit 172 can be implemented in one circuit module or separately. The third timing subunit 177 and the third duration control unit 176 can be implemented in one circuit module or separately. The second timing subunit 173, the second duration control unit 172, the third timing subunit 177 and the third duration control unit 176 can also be implemented in one circuit module.

[0110] In the first to fourth embodiments, the battery protection circuit 120 provides secondary over-inhalation protection for the electronic cigarette, which can at least partially solve the following problems: The first switching unit 210 operates for extended periods, or stops operating for very short periods, resulting in insufficient heat dissipation and excessive temperature rise in the first switching unit 210. This leads to an increase in the overall temperature inside the electronic cigarette, causing the first switching unit 210 to deteriorate and become damaged, as well as damage to the surrounding circuitry, resulting in serious damage to the electronic cigarette. Furthermore, by using the existing second switching unit 140 of the battery protection circuit 120, no additional switching unit is needed, reducing costs. Moreover, by sharing the existing system terminal VM of the battery protection circuit 120, the battery protection module 130 does not require additional terminals, minimizing modifications to the battery protection circuit 120, further reducing costs and design complexity.

[0111] Fifth Embodiment Please see Figure 10a , Figure 10a This is a circuit block diagram of an electronic cigarette according to the fifth embodiment of this application. This embodiment is similar to the first embodiment. Therefore, the parts not described in this embodiment can be referred to the first embodiment. The main difference between this embodiment and the first embodiment is that a first detection resistor 191 is set.

[0112] Please see Figure 10aIn this embodiment, the battery assembly 100 further includes a first detection resistor 191, which is connected in series with the second switching unit 140 and the battery 110, and is located in the main discharge circuit. In this embodiment, the first end of the first detection resistor 191 is electrically connected to the negative terminal of the battery 110, that is, electrically connected to the second ground terminal GND2, and the second end of the first detection resistor 191 is electrically connected to the first end of the second switching unit 140 or the system control circuit. Additionally, for other embodiments of this application, please refer to... Figure 10b The first terminal of the first detection resistor 191 is electrically connected to the positive terminal of the battery 110, that is, electrically connected to the power supply terminal VDD. The second terminal of the first detection resistor 191 is electrically connected to the first terminal of the second switching unit 140 or the system control circuit. Additionally, for other embodiments of this application, please refer to... Figure 10c (Second switch unit 140 is located below) or Figure 10d (The second switching unit 140 is positioned on top). The first terminal of the first detection resistor 191 is electrically connected to the second terminal of the second switching unit 140, that is, electrically connected to the system terminal VM. The second terminal of the first detection resistor 191 is electrically connected to the system control circuit. Additionally, for other embodiments of this application, please refer to... Figure 10e The second switching unit 140 is located below and internally integrated. The first terminal of the first sensing resistor 191 is electrically connected to the negative terminal of the battery 110, and the second terminal of the first sensing resistor 191 is electrically connected to the first terminal of the second switching unit 140. In this embodiment, the resistance value of the first sensing resistor 191 is typically in the milliohm range, for example, 1 milliohm to 100 milliohms.

[0113] In this embodiment, when the first terminal of the first detection resistor 191 is electrically connected to the negative terminal of the battery 110, the voltage at the second terminal of the first detection resistor 191 is the voltage drop of the first detection resistor 191; when the first terminal of the first detection resistor 191 is electrically connected to the positive terminal of the battery 110, the voltage drop of the first detection resistor 191 is the voltage of the battery 110 minus the voltage at the second terminal of the first detection resistor 191; when the first terminal of the first detection resistor 191 is electrically connected to the second terminal of the second switching unit 140, the voltage drop of the first detection resistor 191 is the voltage at the second terminal of the first detection resistor 191 minus the voltage of the system terminal VM, or the voltage of the system terminal VM minus the voltage at the second terminal of the first detection resistor 191.

[0114] In this embodiment, the battery protection module 130 includes a load detection unit, which is used to obtain a first detection voltage. The first detection voltage corresponds to the current in the discharge main circuit where the second switching unit 140 and the first detection resistor 191 are located. The first detection voltage can characterize the current in the discharge main circuit. For example, the first detection voltage and the current in the discharge main circuit have a linear relationship, which can be expressed by the following formula: U = kI + b; Where U represents the first detection voltage, I represents the current flowing through the second switching unit 140 in the main discharge circuit, k is a constant that is not equal to 0, and k can be positive or negative, and b is a constant.

[0115] In this embodiment, the first detection voltage is linearly related to the voltage drop across the first detection resistor 191. For example, the first detection voltage is equal to the voltage drop across the first detection resistor 191, and the ratio of the first detection voltage to the voltage drop across the first detection resistor 191 is 1:1. Of course, in other embodiments, the voltage drop across the first detection resistor 191 can be converted to obtain the first detection voltage, in which case the ratio may not be 1:1, and can be set according to user needs.

[0116] In this embodiment, the load detection unit includes a current detection terminal CS, and there is one current detection terminal CS. The current detection terminal CS is electrically connected to the second terminal of the first detection resistor 191. The voltage drop of the first detection resistor 191 is directly proportional to the current in the discharge main circuit. In this embodiment, the first detection voltage is the voltage drop of the first detection resistor 191. Figure 10a The voltage drop across the first sensing resistor 191 is equal to the voltage at the current sensing terminal CS. Alternatively, in other embodiments of this application, the voltage at the current sensing terminal CS can be used to determine the first sensing voltage.

[0117] In this embodiment, how to perform secondary over-absorption protection after obtaining the first detection voltage can be found in the first to fourth embodiments, and will not be repeated here.

[0118] In addition, please refer to other embodiments of this application. Figure 10f The number of current detection terminals CS is not limited to one; there can also be two current detection terminals CS, namely a first current detection terminal CS1 and a second current detection terminal CS2. The first terminal of the first detection resistor 191 is electrically connected to the positive terminal of the battery 110. The first terminal of the first detection resistor 191 and the positive terminal of the battery 110 may also have other electronic components. The second terminal of the first detection resistor 191 is electrically connected to the system control circuit. The first current detection terminal CS1 is electrically connected to the first terminal of the first detection resistor 191, and the second current detection terminal CS2 is electrically connected to the second terminal of the first detection resistor 191. The voltage drop of the first detection resistor 191 is the product of the current currently flowing through the discharge main circuit and the resistance of the first detection resistor 191. The first detection voltage can be the voltage drop of the first detection resistor 191, which is equal to the voltage of the first current detection terminal CS1 minus the voltage of the second current detection terminal CS2.

[0119] In other embodiments of this application, the first detection resistor 191 may also be connected in series in other suitable positions in the main discharge circuit, and those skilled in the art can make such settings according to actual needs.

[0120] Sixth Embodiment The first to fifth embodiments all detect the current flowing through the main discharge circuit and convert it into a first detection voltage. The operation of the heating element 250 is determined by comparing the magnitude of the first detection voltage with the first reference voltage Vref1. This embodiment differs from the previous embodiments in that it detects the voltage drop of the second switching unit 140 and the voltage drop of the first detection resistor 191. In this embodiment, the operation of the first switching unit 210 is determined by detecting whether the heating branch is conducting. For parts not described in this embodiment, please refer to the first to fifth embodiments.

[0121] Please see Figure 11 In this embodiment, the first switch unit 210 is both top-mounted and internally located. In this embodiment, the first end of the first switch unit 210 is electrically connected to the battery terminal BAT1, and the battery terminal BAT1 is electrically connected to the positive terminal of the battery 110, or via the second switch unit 140. The second end of the first switch unit 210 is electrically connected to the atomizing terminal AT, and the atomizing terminal AT is electrically connected to one end of the heating element 250. The other end of the heating element 250 is connected to the first ground terminal GND1, and the first ground terminal GND1 is electrically connected to the negative terminal of the battery 110 via the second switch unit 140, or via the negative terminal of the battery 110. The atomizing terminal AT is the connection point between the first switch unit 210 and the heating element 250 (hereinafter referred to as the atomizing connection point). Additionally, for other embodiments of this application, please refer to... Figure 13 The first switch unit 210 is located on the top and externally. At this time, the atomizing end AT can be set or not set. Those skilled in the art can set it as needed.

[0122] In this embodiment, when the first switching unit 210 is turned on, the voltage at the connection point (atomizing connection point) between the first switching unit 210 and the heating element 250 is the voltage at the battery terminal BAT1 minus the voltage drop of the first switching unit 210. The voltage at the battery terminal BAT1 is either the voltage of the battery 110 or the voltage at the system terminal VM. The voltage drop of the first switching unit 210 and the second switching unit 140 is generally in the millivolt range. At this time, the voltage at the atomizing connection point is generally greater than 3.2V, and the voltage at the atomizing terminal AT is relatively large. When the first switching unit 210 is turned off, the voltage at the connection point between the first switching unit 210 and the heating element 250 is the voltage at the first ground terminal GND1. The voltage at the first ground terminal GND1 is either 0 or the voltage at the system terminal VM, generally in the 0 or microvolt range. At this time, the voltage at the atomizing connection point is generally less than 0.5V, and the voltage at the atomizing terminal AT is relatively small. Therefore, by judging the voltage at the connection point between the first switching unit 210 and the heating element 250, it is possible to determine whether the heating branch is conducting, and thus whether the first switching unit 210 is conducting or off, and consequently whether the heating element 250 is heating. In this embodiment, the voltage at the atomization connection point differs significantly when the first switch is conducting and when it is off.

[0123] In this embodiment, the battery protection module 130 includes a branch detection unit, which is used to obtain a second detection voltage. The second detection voltage is used to characterize whether the heating branch is conducting. In this embodiment, the branch detection unit includes a heating detection terminal GX, which is added to the battery protection module 130. The heating detection terminal GX is electrically connected to the connection point (atomization connection point) between the first switching unit 210 and the heating element 250. In this embodiment, the heating detection terminal GX is electrically connected to the atomization terminal AT. The voltage of the heating detection terminal GX is used to determine the second detection voltage. In this embodiment, the voltage of the heating detection terminal GX is the second detection voltage. Of course, in other embodiments, the voltage of the heating detection terminal GX can be converted to obtain the second detection voltage. In this embodiment, the battery protection module 130 can determine whether the heating branch is conducting by detecting the voltage of the atomization connection point through the heating detection terminal GX, and thus determine whether the heating element 250 is heating.

[0124] Please see Figure 12a , Figure 12b , Figure 12cIn this embodiment, the battery protection module 130 further includes a secondary over-absorption protection unit 160, which is electrically connected to the heat detection terminal GX and the logic control unit 150, respectively. In this embodiment, the secondary over-absorption protection unit 160 includes an over-absorption comparator unit 161, which is, for example, a voltage comparator. One input terminal of the over-absorption comparator unit 161 is electrically connected to the heat detection terminal GX, and the other input terminal is electrically connected to a first reference voltage generation unit 138. The first reference voltage generation unit 138 generates a third reference voltage Vref3 and inputs it to the over-absorption comparator unit 161. In this embodiment, the third reference voltage Vref3 is generally between 0.5V and 3.2V, for example, 0.5V, 1V, 1.5V, 2V, 2.5V, 3V, 3.2V, etc. In this embodiment, when the first switching unit 210 is turned off, the heating branch is disconnected. At this time, the voltage of the heating detection terminal GX is equal to the voltage of the first ground terminal GND1, and less than the third reference voltage Vref3. That is, the second detection voltage is less than the third reference voltage Vref3, and the over-absorption comparator 161 outputs a second level signal. When the first switching unit 210 is turned on, the heating branch is turned on. At this time, the voltage of the heating detection terminal GX is close to the voltage of the battery terminal BAT1 (in addition to the first switching unit 210, other components, such as a detection resistor, can be added between the battery terminal BAT1 and the heating detection terminal GX), and greater than the third reference voltage Vref3. That is, the second detection voltage is greater than the third reference voltage Vref3, and the over-absorption comparator 161 outputs a first level signal. In this embodiment, the first level signal is either high or low, and the second level signal is either low or high.

[0125] Please continue reading Figure 12b In this embodiment, the logic control unit 150 includes an over-suction logic unit 152 and a battery logic unit 151. The battery logic unit 151 is electrically connected to an over-discharge voltage protection unit 131, a discharge overcurrent protection unit 134, an overcharge voltage protection unit 132, and a charging overcurrent protection unit 133, respectively. The battery logic unit 151 is also electrically connected to the control terminal of the second switching unit 140, and can control the second switching unit 140 to be turned on or off. In this embodiment, the over-suction logic unit 152 is electrically connected to a secondary over-suction protection unit 160, specifically to the output terminal of the over-suction comparison unit 161. The over-suction logic unit 152 is also electrically connected to the battery logic unit 151 or the over-discharge voltage protection unit 131. For other embodiments of this application, please refer to... Figure 3bThe input terminal of the secondary over-suction protection unit 160 is electrically connected to the heating detection terminal GX, the output terminal of the secondary over-suction protection unit 160 is electrically connected to the over-suction logic unit 152, and the over-suction logic unit 152 is electrically connected to the control terminal of the second switching unit 140 to control the second switching unit 140 to be turned on or off.

[0126] Please continue reading Figure 12b and 12c In this embodiment, the oversinking logic unit 152 includes a second timing unit 171, a second duration control unit 172, a third timing unit 175, and a third duration control unit 176. The connection relationship and function of the second timing unit 171, the second duration control unit 172, the third timing unit 175, and the third duration control unit 176 are described in the previous embodiments and will not be repeated here. Additionally, in other embodiments of this application, please refer to... Figure 3c and Figure 3d Alternatively, the third timing unit 175 and the third duration control unit 176 may be omitted (please refer to the first-third embodiments). The working principle and function of the secondary over-sucking protection unit 160 and the over-sucking logic unit 152 in this embodiment can be found in the previous embodiments, and will not be repeated here.

[0127] In this embodiment, when the second duration control unit 172 learns that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151, or outputs an over-discharge signal to the over-discharge voltage protection unit 131. The over-discharge voltage protection unit 131 outputs a sleep signal to the battery logic unit 151, and the battery logic unit 151 controls the battery protection circuit 120 to enter sleep mode, while simultaneously controlling the second timing unit 171 to reset to zero. In sleep mode, the second switch unit 140 remains open so that the battery 110 stops supplying power to the atomizing assembly 200. Preferably, in sleep mode, at least some units of the battery protection module 130 do not consume power (leakage current not considered). Preferably, in sleep mode, the entire battery protection module 130 does not consume power (leakage current not considered). In addition, in other embodiments of this application, when the second duration control unit 172 learns that the duration of the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary over-sucking protection signal to control the second switching unit 140 to remain off. For details, please refer to the previous embodiments, which will not be repeated here.

[0128] In this embodiment, the second timing unit 171 includes a first reference frequency generating unit 174 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177. Alternatively, the second timing unit 171 includes a second reference frequency generating unit 178 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177. These have been described in detail in the previous embodiments and will not be repeated here.

[0129] In this embodiment, the second preset duration is adjustable. For details on how it can be adjusted, please refer to the previous embodiments, which will not be repeated here.

[0130] Seventh Embodiment Please see Figure 14 , Figure 14 This is a circuit block diagram of an electronic cigarette according to the seventh embodiment of this application. This embodiment is similar to the sixth embodiment. Therefore, the parts not described in this embodiment can be referred to the sixth embodiment. The main difference between this embodiment and the sixth embodiment is that the first switch unit 210 is located at the bottom.

[0131] Please see Figure 14 In this embodiment, the first switching unit 210 is located at the bottom and is internally mounted. In this embodiment, the first end of the first switching unit 210 is electrically connected to the first ground terminal GND1. The first ground terminal GND1 is electrically connected to the negative terminal of the battery 110 via the second switching unit 140, or to the negative terminal of the battery 110. The second end of the first switching unit 210 is electrically connected to the atomizing end AT. The atomizing end AT is electrically connected to one end of the heating element 250. The other end of the heating element 250 is electrically connected to the battery terminal BAT1. The battery terminal BAT1 is electrically connected to the positive terminal of the battery 110, or to the positive terminal of the battery 110 via the second switching unit 140. The atomizing end AT is the connection point between the first switching unit 210 and the heating element 250 (hereinafter referred to as the atomizing connection point). Additionally, for other embodiments of this application, please refer to... Figure 15 The first switch unit 210 is located at the bottom and externally. At this time, the atomizing end AT can be set or not set. Those skilled in the art can set it as needed.

[0132] In this embodiment, when the first switching unit 210 is turned on, the voltage at the connection point (atomization connection point) between the first switching unit 210 and the heating element 250 is close to the voltage of the first ground terminal GND1. Specifically, it is the voltage of the first ground terminal GND1 plus the voltage drop of the first switching unit 210. The voltage of the first ground terminal GND1 is either the voltage of the system terminal VM or 0. The voltage drops of the first switching unit 210 and the second switching unit 140 are generally in the millivolt range. Therefore, the voltage of the atomization terminal AT is in the millivolt range. At this time, the voltage of the atomization connection point is generally less than 0.5V, and the voltage of the atomization terminal AT is relatively small. When the first switching unit 210 is turned off, the voltage at the connection point between the first switching unit 210 and the heating element 250 is the voltage of the battery terminal BAT1. The voltage of the battery terminal BAT1 is either the voltage of the system terminal VM or the voltage of the positive terminal of the battery 110. The voltage drop of the second switching unit 140 is generally in the microvolt range. At this time, the voltage of the atomization connection point is generally greater than 3.2V, and the voltage of the atomization terminal AT is relatively large. Therefore, by judging the voltage at the connection point between the first switching unit 210 and the heating element 250, it is possible to determine whether the heating branch is conducting, and thus whether the first switching unit 210 is conducting or off, and consequently whether the heating element 250 is heating. In this embodiment, the voltage at the atomization connection point differs significantly when the first switch is conducting and when it is off.

[0133] In this embodiment, the battery protection module 130 includes a branch detection unit, which is used to obtain a second detection voltage. The second detection voltage is used to characterize whether the heating branch is conducting. In this embodiment, the branch detection unit includes a heating detection terminal GX, which is added to the battery protection module 130. The heating detection terminal GX is electrically connected to the connection point (atomization connection point) between the first switching unit 210 and the heating element 250. In this embodiment, the heating detection terminal GX is electrically connected to the atomization terminal AT. The voltage of the heating detection terminal GX is used to determine the second detection voltage. In this embodiment, the voltage of the heating detection terminal GX is the second detection voltage. Of course, in other embodiments, the voltage of the heating detection terminal GX can be converted to obtain the second detection voltage. In this embodiment, the battery protection module 130 can determine whether the heating branch is conducting by detecting the voltage at the atomization connection point through the heating detection terminal GX, and thus determine whether the heating element 250 is heating.

[0134] Please see Figure 12a , Figure 12b , Figure 12cIn this embodiment, the battery protection module 130 further includes a secondary over-absorption protection unit 160, which is electrically connected to the heat detection terminal GX and the logic control unit 150, respectively. In this embodiment, the secondary over-absorption protection unit 160 includes an over-absorption comparator unit 161, which is, for example, a voltage comparator. One input terminal of the over-absorption comparator unit 161 is electrically connected to the heat detection terminal GX, and the other input terminal is electrically connected to the first reference voltage generation unit 138. The first reference voltage generation unit 138 generates a fourth reference voltage Vref4 and inputs it to the over-absorption comparator unit 161. In this embodiment, the fourth reference voltage Vref4 is generally between 0.5V and 3.2V, such as 0.5V, 1V, 1.5V, 2V, 2.5V, 3V, 3.2V, etc. In this embodiment, when the first switching unit 210 is turned off, the heating branch is disconnected. At this time, the voltage of the heating detection terminal GX is equal to the voltage of the battery terminal BAT1, which is greater than the fourth reference voltage Vref4. That is, the second detection voltage is greater than the fourth reference voltage Vref4, and the over-absorption comparator 161 outputs a second level signal. When the first switching unit 210 is turned on, the heating branch is turned on. At this time, the voltage of the heating detection terminal GX is close to the voltage of the first ground terminal GND1 (in addition to the first switching unit 210, other components, such as a detection resistor, can be added between the first ground terminal GND1 and the heating detection terminal GX), which is less than the fourth reference voltage Vref4. That is, the second detection voltage is less than the fourth reference voltage Vref4, and the over-absorption comparator 161 outputs a first level signal. In this embodiment, the first level signal is either high or low, and the second level signal is either low or high.

[0135] Please continue reading Figure 12b In this embodiment, the logic control unit 150 includes an over-suction logic unit 152 and a battery logic unit 151. The battery logic unit 151 is electrically connected to an over-discharge voltage protection unit 131, a discharge overcurrent protection unit 134, an overcharge voltage protection unit 132, and a charging overcurrent protection unit 133, respectively. The battery logic unit 151 is also electrically connected to the control terminal of the second switching unit 140, and can control the second switching unit 140 to be turned on or off. In this embodiment, the over-suction logic unit 152 is electrically connected to a secondary over-suction protection unit 160, specifically to the output terminal of the over-suction comparison unit 161. The over-suction logic unit 152 is also electrically connected to the battery logic unit 151 or the over-discharge voltage protection unit 131. For other embodiments of this application, please refer to... Figure 3bThe input terminal of the secondary over-suction protection unit 160 is electrically connected to the heating detection terminal GX, the output terminal of the secondary over-suction protection unit 160 is electrically connected to the over-suction logic unit 152, and the over-suction logic unit 152 is electrically connected to the control terminal of the second switching unit 140 to control the second switching unit 140 to be turned on or off.

[0136] Please continue reading Figure 12b and 12c In this embodiment, the oversinking logic unit 152 includes a second timing unit 171, a second duration control unit 172, a third timing unit 175, and a third duration control unit 176. The connection relationship and function of the second timing unit 171, the second duration control unit 172, the third timing unit 175, and the third duration control unit 176 are described in the previous embodiments and will not be repeated here. Additionally, in other embodiments of this application, please refer to... Figure 3c and Figure 3d Alternatively, the third timing unit 175 and the third duration control unit 176 may not be included (please refer to the first-third embodiments). The working principle of the secondary over-sucking protection unit 160 and the over-sucking logic unit 152 in this embodiment can be found in the previous embodiments, and will not be repeated here.

[0137] In this embodiment, when the second duration control unit 172 learns that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151, or outputs an over-discharge signal to the over-discharge voltage protection unit 131. The over-discharge voltage protection unit 131 outputs a sleep signal to the battery logic unit 151, and the battery logic unit 151 controls the battery protection circuit 120 to enter sleep mode, while simultaneously controlling the second timing unit 171 to reset to zero. In sleep mode, the second switch unit 140 remains open so that the battery 110 stops supplying power to the atomizing assembly 200. Preferably, in this embodiment, at least some units of the battery protection module 130 do not consume power in sleep mode (leakage current is not considered). Preferably, the entire battery protection module 130 does not consume power in sleep mode (leakage current is not considered). In addition, in other embodiments of this application, when the second duration control unit 172 learns that the duration of the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary over-sucking protection signal to control the second switching unit 140 to remain off. For details, please refer to the previous embodiments, which will not be repeated here.

[0138] In this embodiment, the second timing unit 171 includes a first reference frequency generating unit 174 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177. Alternatively, the second timing unit 171 includes a second reference frequency generating unit 178 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177. These have been described in detail in the previous embodiments and will not be repeated here.

[0139] In this embodiment, the second preset duration is adjustable. For details on how it can be adjusted, please refer to the previous embodiments, which will not be repeated here.

[0140] Eighth embodiment Figure 16a This is a circuit block diagram of an electronic cigarette according to the eighth embodiment of this application. This embodiment is similar to the sixth embodiment. Therefore, the parts not described in this embodiment can be referred to the sixth embodiment. The main difference between this embodiment and the sixth embodiment is that the first switching unit 210 is not determined by the voltage of the atomizing end AT.

[0141] Please see Figure 16a In this embodiment, the atomizing component 200 also includes a second detection resistor 271. The second detection resistor 271 is connected in series with the first switching unit 210 and the heating element 250 to form a heating branch. Generally, the resistance value of the second detection resistor 271 is in the milliohm range, for example, 1 milliohm to 100 milliohm.

[0142] In this embodiment, the first switching unit 210 is both top-mounted and internally located. In this embodiment, the first terminal of the first switching unit 210 is electrically connected to the battery terminal BAT1, and the battery terminal BAT1 is electrically connected to the positive terminal of the battery 110, or via the second switching unit 140. The second terminal of the first switching unit 210 is electrically connected to the atomizing terminal AT, and the atomizing terminal AT is electrically connected to one end of the heating element 250. The other end of the heating element 250 is connected to one end of the second detection resistor 271, and the other end of the second detection resistor 271 is connected to the first ground terminal GND1. The first ground terminal GND1 is electrically connected to the negative terminal of the battery 110 via the second switching unit 140, or via the negative terminal of the battery 110. Furthermore, in other embodiments of this application, the positions of the second detection resistor 271 and the heating element 250 can be interchanged.

[0143] Please continue reading Figure 16aIn this embodiment, the battery protection module 130 further includes a branch detection unit and a secondary over-absorption protection unit 160. The branch detection unit is electrically connected to the heating branch and is used to obtain a second detection voltage, which characterizes whether the heating branch is conducting. In this embodiment, when the heating branch is conducting, the second detection voltage is one value; when the heating branch is not conducting and is disconnected, the second detection voltage is another different value. In this embodiment, the secondary over-absorption protection unit 160 is electrically connected to both the branch detection unit and the logic control unit 150.

[0144] In this embodiment, the branch detection unit includes a heat detection terminal GX, which is added to the battery protection module 130. The heat detection terminal GX is electrically connected to the connection point of the second detection resistor 271 and the heating element 250. The voltage of the heat detection terminal GX is used to determine the second detection voltage. In this embodiment, the voltage of the heat detection terminal GX is the second detection voltage. Of course, in other embodiments, the voltage of the heat detection terminal GX can be converted to obtain the second detection voltage. In this embodiment, the heat detection terminal GX is electrically connected to one input terminal of the over-absorption comparison unit 161 of the secondary over-absorption protection unit. The other input terminal of the over-absorption comparison unit 161 is electrically connected to the first reference voltage generation unit 138, which is used to generate the third reference voltage Vref3.

[0145] In this embodiment, when there is airflow, the airflow detection element 240 is triggered, and the first switching unit 210 is turned on. At this time, the current in the heating branch is relatively large, in the ampere level, such as 0.5A, 1A, 2A, etc. At this time, the voltage of the heating detection terminal GX is the voltage of the first ground terminal GND1 plus the voltage drop of the second detection resistor 271. The voltage drops of the second switching unit 140 and the second detection resistor 271 are generally in the millivolt level. When there is no airflow or it is in the off-time, the first switching unit 210 is turned off, and no current flows in the heating branch. At this time, the voltage of the heating detection terminal GX is equal to the voltage of the first ground terminal GND1, and the voltage drop of the second switching unit 140 is generally in the microvolt level. In this embodiment, the third reference voltage Vref3 is greater than the voltage of the first ground terminal GND1 when the first switching unit 210 is turned off, and less than the voltage of the first ground terminal GND1 plus the voltage drop of the second detection resistor 271 when the first switching unit 210 is turned on. Therefore, by judging the voltage of the heat detection terminal GX, it can be determined whether the first switching unit 210 is turned on.

[0146] In this embodiment, how the over-absorption comparison unit 161 triggers the secondary over-absorption protection after obtaining the voltage of the heating detection terminal GX and the third reference voltage Vref3 can be found in the previous embodiments, and will not be repeated here.

[0147] In addition, the position of the second sensing resistor 271 is not limited to Figure 16a As shown, in other embodiments of this application, please refer to Figure 16b The first switching unit 210 is located on top and externally. In this embodiment, one end of the second detection resistor 271 is electrically connected to the battery terminal BAT1, which is electrically connected to the positive terminal of the battery 110, or via the second switching unit 140. The other end of the second detection resistor 271 is electrically connected to the first terminal of the first switching unit 210, and the second terminal of the first switching unit 210 is electrically connected to the atomizing terminal AT. The atomizing terminal AT is electrically connected to one end of the heating element 250, and the other end of the heating element 250 is connected to the first ground terminal GND1. The first ground terminal GND1 is electrically connected to the negative terminal of the battery 110 via the second switching unit 140, or via the negative terminal of the battery 110. In this embodiment, the heating detection terminal GX is electrically connected to the connection point of the first switching unit 210 and the second detection resistor 271. The voltage of the heating detection terminal GX is used to determine the second detection voltage; for example, the voltage of the heating detection terminal GX is the second detection voltage. When the first switching unit 210 is turned on, the current in the heating branch is relatively large, in the ampere level, such as 0.5A, 1A, 2A, etc. At this time, the voltage at the heating detection terminal GX is the voltage at the battery terminal BAT1 minus the voltage drop of the second detection resistor 271. The voltage drops of the second switching unit 140 and the second detection resistor 271 are generally in the millivolt level. When the first switching unit 210 is turned off, no current flows through the heating branch. At this time, the voltage at the heating detection terminal GX is equal to the voltage at the battery terminal BAT1. The voltage drop of the second switching unit 140 is generally in the microvolt level. In this embodiment, one input terminal of the over-sucking comparator unit 161 is electrically connected to the heating detection terminal GX, and the other input terminal is connected to the fourth reference voltage Vref4. In this embodiment, the fourth reference voltage Vref4 is less than the voltage at the battery terminal BAT1 when the first switching unit 210 is turned off, and greater than the voltage at the battery terminal BAT1 minus the voltage drop of the second detection resistor 271 when the first switching unit 210 is turned on. Therefore, by determining whether the voltage at the heat detection terminal GX is greater than the fourth reference voltage Vref4, it can be determined whether the first switching unit 210 is conducting, and thus whether the heat-generating branch is conducting. Furthermore, in other embodiments of this application, the positions of the second detection resistor 271 and the first switching unit 210 can be interchanged. Generally, the on-resistance of the first switching unit 210 is in the milliohm range.

[0148] In addition, the position of the second sensing resistor 271 is not limited to Figure 16a As shown, in other embodiments of this application, please refer to Figure 16cThe first switching unit 210 is located below and is internally integrated. In this embodiment, one end of the second detection resistor 271 is electrically connected to the battery terminal BAT1, which is electrically connected to the positive terminal of the battery 110, or via the second switching unit 140. The other end of the second detection resistor 271 is electrically connected to one end of the heating element 250, which is connected to the atomizing terminal AT. The atomizing terminal AT is electrically connected to one end of the first switching unit 210, and the other end of the first switching unit 210 is electrically connected to the first ground terminal GND1. The first ground terminal GND1 is electrically connected to the negative terminal of the battery 110 via the second switching unit 140, or via the negative terminal of the battery 110. In this embodiment, the heating detection terminal GX is electrically connected to the connection point of the heating element 250 and the second detection resistor 271. The voltage of the heating detection terminal GX is used to determine the second detection voltage; for example, the voltage of the heating detection terminal GX is the second detection voltage. In this embodiment, when the first switching unit 210 is turned on, the current in the heating branch is relatively large, at the ampere level. At this time, the voltage at the heating detection terminal GX is the voltage at the battery terminal BAT1 minus the voltage drop across the second detection resistor 271. The voltage drops of the second switching unit 140 and the second detection resistor 271 are typically at the millivolt level. When the first switching unit 210 is turned off, no current flows through the heating branch. At this time, the voltage at the heating detection terminal GX is equal to the voltage at the battery terminal BAT1. The voltage drop across the second switching unit 140 is typically at the microvolt level. In this embodiment, one input terminal of the over-sucking comparator unit 161 is electrically connected to the heating detection terminal GX, and the other input terminal is connected to the fourth reference voltage Vref4. In this embodiment, the fourth reference voltage Vref4 is less than the voltage at the battery terminal BAT1 when the first switching unit 210 is turned off, and greater than the voltage at the battery terminal BAT1 minus the voltage drop across the second detection resistor 271 when the first switching unit 210 is turned on. Therefore, by determining whether the voltage at the heat detection terminal GX is greater than the fourth reference voltage Vref4, it can be determined whether the first switching unit 210 is turned on. Furthermore, in other embodiments of this application, the positions of the second detection resistor 271 and the heating element 250 can be interchanged.

[0149] In addition, the position of the second sensing resistor 271 is not limited to Figure 16a As shown, in other embodiments of this application, please refer to Figure 16dThe first switching unit 210 is located below and externally. In this embodiment, one end of the heating element 250 is electrically connected to the battery terminal BAT1, and the battery terminal BAT1 is electrically connected to the positive terminal of the battery 110, or via the second switching unit 140. The other end of the heating element 250 is connected to the atomizing terminal AT, and the atomizing terminal AT is electrically connected to one end of the first switching unit 210. The other end of the first switching unit 210 is electrically connected to one end of the second detection resistor 271, and the other end of the second detection resistor 271 is electrically connected to the first ground terminal GND1. The first ground terminal GND1 is electrically connected to the negative terminal of the battery 110 via the second switching unit 140, or via the negative terminal of the battery 110. In this embodiment, the heating detection terminal GX is electrically connected to the connection point of the first switching unit 210 and the second detection resistor 271. The voltage of the heating detection terminal GX is used to determine the second detection voltage; for example, the voltage of the heating detection terminal GX is the second detection voltage. In this embodiment, when the first switching unit 210 is turned on, the current in the heating branch is relatively large, at the ampere level. At this time, the voltage at the heating detection terminal GX is the voltage at the first ground terminal GND1 plus the voltage drop across the second detection resistor 271. The voltage drops of the second switching unit 140 and the second detection resistor 271 are generally at the millivolt level. When the first switching unit 210 is turned off, no current flows through the heating branch. At this time, the voltage at the heating detection terminal GX is equal to the voltage at the first ground terminal GND1. The voltage drop of the second switching unit 140 is generally at the microvolt level. In this embodiment, one input terminal of the over-sinking comparator unit 161 is electrically connected to the heating detection terminal GX, and the other input terminal is connected to the third reference voltage Vref3. Therefore, the third reference voltage Vref3 is less than the voltage at the first ground terminal GND1 plus the voltage drop across the second detection resistor 271 when the first switching unit 210 is turned on, and greater than the voltage at the first ground terminal GND1 when the first switching unit 210 is turned off. Therefore, by determining whether the voltage at the heat detection terminal GX is greater than the third reference voltage Vref3, it can be determined whether the first switching unit 210 is turned on. Furthermore, in other embodiments of this application, the positions of the second detection resistor 271 and the first switching unit 210 can be interchanged.

[0150] In other embodiments of this application, the second detection resistor 271 can also be connected in series at other suitable locations in the heating branch, and those skilled in the art can make the settings according to actual needs.

[0151] Ninth Embodiment Please see Figure 17 , Figure 17This is a circuit block diagram of an electronic cigarette according to the ninth embodiment of this application. This embodiment is similar to the sixth embodiment. Therefore, the parts not described in this embodiment can be referred to the sixth embodiment. The main difference between this embodiment and the sixth embodiment is that the heat detection terminal GX is electrically connected to the control terminal of the first switching unit 210.

[0152] Generally speaking, when the first switching unit 210 is a PMOS (this embodiment uses a PMOS transistor as an example), the control terminal of the first switching unit 210 is driven to turn on by a lower voltage, such as the voltage of the first ground terminal GND1, and the control terminal of the first switching unit 210 is driven to turn off by a higher voltage, such as the voltage of the battery terminal BAT1. When the first switching unit 210 is an NMOS, the control terminal of the first switching unit 210 is driven to turn on by a higher voltage, such as the voltage of the battery terminal BAT1, and the control terminal of the first switching unit 210 is driven to turn off by a lower voltage, such as the voltage of the battery terminal BAT1. Therefore, the voltage that drives the first switching unit 210 to turn on or off is generally determined.

[0153] Please see Figure 17 In this embodiment, the battery protection module 130 includes a branch detection unit, which is used to obtain a second detection voltage, which is used to characterize whether the heating branch is conducting. In this embodiment, the branch detection unit includes a heating detection terminal GX, which is electrically connected to the control terminal of the first switching unit 210. The voltage of the heating detection terminal GX is used to determine the second detection voltage. In this embodiment, the voltage of the heating detection terminal GX is the second detection voltage. Of course, in other embodiments, the voltage of the heating detection terminal GX can be converted to obtain the second detection voltage. In this embodiment, the voltage of the control terminal of the first switching unit 210 can be directly obtained through the heating detection terminal GX, thereby determining whether the first switching unit 210 is conducting and whether the heating branch is conducting. In this embodiment, regardless of whether the first switching unit 210 is built-in or external, the system control module 272 includes a first switch control terminal GT (pin), which is electrically connected to the control terminal of the first switching unit 210, and the heating detection terminal GX is electrically connected to the first switch control terminal GT.

[0154] Please refer to the above. Figure 12a , Figure 12b , Figure 12c and Figure 17In this embodiment, the battery protection module 130 further includes a secondary over-absorption protection unit 160, which is electrically connected to the heat detection terminal GX and the logic control unit 150, respectively. In this embodiment, the secondary over-absorption protection unit 160 includes an over-absorption comparator unit 161, which is, for example, a voltage comparator. One input terminal of the over-absorption comparator unit 161 is electrically connected to the heat detection terminal GX, and the other input terminal is electrically connected to the first reference voltage generation unit 138. The first reference voltage generation unit 138 generates a fourth reference voltage Vref4 and inputs it to the over-absorption comparator unit 161. In this embodiment, the fourth reference voltage Vref4 is generally between 0.5V and 2V, but it can also be set according to actual needs, such as 0.5V, 1V, 1.5V, 2V, etc. In this embodiment, when the first switching unit 210 is turned off, the heating branch is disconnected. At this time, the voltage at the heating detection terminal GX is greater than the fourth reference voltage Vref4, and the over-absorption comparator unit 161 outputs a second-level signal. When the first switching unit 210 is turned on, the heating branch is turned on. At this time, the voltage at the heating detection terminal GX is less than the fourth reference voltage Vref4, and the over-absorption comparator unit 161 outputs a first-level signal. In this embodiment, the first-level signal is either high or low, and the second-level signal is either low or high. In other embodiments of this application, when the first switching unit 210 is an NMOS transistor, the other input terminal of the oversink comparator 161 is connected to a third reference voltage Vref3. The third reference voltage Vref3 is generally between 0.5V and 2V, but can also be set according to actual needs, such as 0.5V, 1V, 1.5V, 2V, etc. At this time, when the first switching unit 210 is turned off, the heating branch is disconnected. At this time, the voltage of the heating detection terminal GX is less than the third reference voltage Vref3, and the oversink comparator 161 outputs a second level signal. When the first switching unit 210 is turned on, the heating branch is turned on. At this time, the voltage of the heating detection terminal GX is greater than the third reference voltage Vref3, and the oversink comparator 161 outputs a first level signal.

[0155] Please continue reading Figure 12bIn this embodiment, the logic control unit 150 includes an over-suction logic unit 152 and a battery logic unit 151. The battery logic unit 151 is electrically connected to an over-discharge voltage protection unit 131, a discharge overcurrent protection unit 134, an overcharge voltage protection unit 132, and a charging overcurrent protection unit 133, respectively. The battery logic unit 151 is also electrically connected to the control terminal of the second switching unit 140, and can control the second switching unit 140 to be turned on or off. In this embodiment, the over-suction logic unit 152 is electrically connected to a secondary over-suction protection unit 160, specifically to the output terminal of the over-suction comparison unit 161. The over-suction logic unit 152 is also electrically connected to the battery logic unit 151 or the over-discharge voltage protection unit 131. For other embodiments of this application, please refer to... Figure 3b The input terminal of the secondary over-suction protection unit 160 is electrically connected to the heating detection terminal GX, the output terminal of the secondary over-suction protection unit 160 is electrically connected to the over-suction logic unit 152, and the over-suction logic unit 152 is electrically connected to the control terminal of the second switching unit 140 to control the second switching unit 140 to be turned on or off.

[0156] Please continue reading Figure 12b and 12c In this embodiment, the oversinking logic unit 152 includes a second timing unit 171, a second duration control unit 172, a third timing unit 175, and a third duration control unit 176. The connection relationship and function of the second timing unit 171, the second duration control unit 172, the third timing unit 175, and the third duration control unit 176 are described in the previous embodiments and will not be repeated here. Additionally, in other embodiments of this application, please refer to... Figure 3c and Figure 3d Alternatively, the third timing unit 175 and the third duration control unit 176 may not be included. The working principle and function of the secondary over-sucking protection unit 160 and the over-sucking logic unit 152 in this embodiment can be found in the previous embodiments, and will not be repeated here.

[0157] In this embodiment, when the second duration control unit 172 learns that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151, or outputs an over-discharge signal to the over-discharge voltage protection unit 131. The over-discharge voltage protection unit 131 outputs a sleep signal to the battery logic unit 151, and the battery logic unit 151 controls the battery protection circuit 120 to enter sleep mode, while simultaneously controlling the second timing unit 171 to reset to zero. In sleep mode, the second switch unit 140 remains open so that the battery 110 stops supplying power to the atomizing assembly 200. Preferably, in sleep mode, at least some units of the battery protection module 130 do not consume power (leakage current not considered). Preferably, in sleep mode, the entire battery protection module 130 does not consume power (leakage current not considered). In addition, in other embodiments of this application, when the second duration control unit 172 learns that the duration of the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary over-sucking protection signal to control the second switching unit 140 to remain off. For details, please refer to the previous embodiments, which will not be repeated here.

[0158] In this embodiment, the second timing unit 171 includes a first reference frequency generating unit 174 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177. Alternatively, the second timing unit 171 includes a second reference frequency generating unit 178 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177. These have been described in detail in the previous embodiments and will not be repeated here.

[0159] In this embodiment, the second preset duration is adjustable. For details on how it can be adjusted, please refer to the previous embodiments, which will not be repeated here.

[0160] It should be understood that "a plurality of" as used herein refers to two or more. Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0161] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus embodiments, since they are basically similar to the method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0162] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A battery protection chip for use in electronic cigarettes, characterized in that, The device includes a power supply pin, a second ground pin, a second switch control pin, an over-discharge voltage protection unit, a discharge overcurrent protection unit, a first reference voltage generation unit, and a logic control unit. The power supply pin and the second ground pin are electrically connected to the two ends of the battery, respectively. The logic control unit is electrically connected to the over-discharge voltage protection unit, the discharge overcurrent protection unit, and the second switch control pin. The second switch control pin is electrically connected to the control terminal of the second switch unit. The second switch unit is used to control the battery to supply power to the heating branch. The heating branch includes a first switch unit and a heating element connected in series. The battery protection chip also includes a secondary over-suction protection unit and a heat detection pin. The secondary over-suction protection unit is electrically connected to the heat detection pin and the logic control unit, respectively. The heat detection pin is used to electrically connect to the connection point of the first switching unit and the heating element, or the heat detection pin is used to electrically connect to the control terminal of the first switching unit. When the secondary over-suction protection unit determines that the voltage of the heat detection pin is greater than a preset third reference voltage or less than a preset fourth reference voltage, the logic control unit starts timing. When the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switching unit to remain open. The logic control unit includes an over-sucking logic unit, which comprises a second timing unit, a second duration control unit, a third timing unit, and a third duration control unit. The input terminals of the second and third timing units are electrically connected to the secondary over-sucking protection unit. The second timing unit is electrically connected to the second duration control unit, and the third timing unit is electrically connected to the third duration control unit. The third duration control unit is electrically connected to the second timing unit, and the second duration control unit is electrically connected to the second switch control pin. When the secondary over-sucking protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second timing unit starts timing. When the secondary over-sinking protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the third timing unit starts timing. When the secondary over-sinking protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the third timing unit stops timing. When the third duration control unit determines that the timing duration of the third timing unit is greater than or equal to the third preset duration, it outputs a reset signal to the second timing unit to stop timing and set the timing duration to zero. When the second duration control unit determines that the timing duration of the second timing unit is greater than or equal to the second preset duration, the second duration control unit outputs a secondary over-sinking protection signal to control the second switching unit to remain open; or... The logic control unit includes a battery logic unit and an over-suction logic unit. The battery logic unit is electrically connected to the over-discharge voltage protection unit, the over-discharge current protection unit, and the second switch control pin, respectively. The over-suction logic unit includes a second timing unit, a second duration control unit, a third timing unit, and a third duration control unit. The input terminals of the second timing unit and the third timing unit are electrically connected to the secondary over-suction protection unit, respectively. The second timing unit is electrically connected to the second duration control unit, the third timing unit is electrically connected to the third duration control unit, and the third duration control unit is electrically connected to the second timing unit. The second duration control unit is electrically connected to either the battery logic unit or the over-discharge voltage protection unit. When the secondary over-suction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second timing unit starts... The timing mechanism is as follows: when the secondary over-suction protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the third timing unit starts timing; when the secondary over-suction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the third timing unit stops timing. When the third duration control unit determines that the timing duration of the third timing unit is greater than or equal to the third preset duration, it outputs a reset signal to the second timing unit to stop timing and set the timing duration to zero. When the second duration control unit determines that the timing duration of the second timing unit is greater than or equal to the second preset duration, the second duration control unit outputs a sleep signal to the battery logic unit or outputs an over-discharge signal to the over-discharge voltage protection unit. The battery logic unit controls the battery protection chip to enter sleep mode, and in sleep mode, the second switching unit remains open.

2. The battery protection chip according to claim 1, characterized in that, The secondary over-absorption protection unit includes an over-absorption comparator unit. One input terminal of the over-absorption comparator unit is electrically connected to the heat detection pin, and the other input terminal of the over-absorption comparator unit is connected to a third reference voltage or a fourth reference voltage. The output terminal of the over-absorption comparator unit is electrically connected to the logic control unit.

3. The battery protection chip according to claim 1, characterized in that, The logic control unit includes a battery logic unit and an over-suction logic unit. The battery logic unit is electrically connected to the over-discharge voltage protection unit, the over-discharge current protection unit, and the second switch control pin. The over-suction logic unit is electrically connected to the secondary over-suction protection unit. The over-suction logic unit is also electrically connected to either the battery logic unit or the over-discharge voltage protection unit.

4. The battery protection chip according to claim 3, characterized in that, When the over-suction logic unit time is greater than or equal to the second preset duration, the over-suction logic unit outputs a sleep signal to the battery logic unit or outputs an over-discharge signal to the over-discharge voltage protection unit. The battery logic unit controls the battery protection chip to enter sleep mode, and in sleep mode, the second switch unit remains open.

5. The battery protection chip according to claim 4, characterized in that, The battery protection chip includes a battery protection module. In sleep mode, at least some units of the battery protection module stop consuming power, or all units of the battery protection module stop consuming power.

6. The battery protection chip according to claim 1, characterized in that, The logic control unit includes a battery logic unit and an over-suction logic unit. The battery logic unit is electrically connected to the over-discharge voltage protection unit and the over-discharge current protection unit, respectively. The over-suction logic unit is electrically connected to the secondary over-suction protection unit. Both the over-suction logic unit and the battery logic unit are electrically connected to the second switch control pin to control whether the second switch unit is disconnected.

7. The battery protection chip according to claim 6, characterized in that, The logic control unit further includes a logic gate circuit. One input terminal of the logic gate circuit is electrically connected to the battery logic unit, and the other input terminal is electrically connected to the over-suction logic unit. The output terminal of the logic gate circuit is electrically connected to the second switch control pin. When the logic gate circuit receives any signal to turn off the second switch unit, the logic gate circuit controls the second switch unit to turn off through the second switch control pin. When both the battery logic unit and the over-suction logic unit output signals to turn on the second switch unit, the logic gate circuit controls the second switch unit to turn on through the second switch control pin.

8. The battery protection chip according to any one of claims 1-7, characterized in that, The second timing unit includes a first reference frequency generator and a second timing subunit, and the third timing unit includes a third timing subunit; wherein, the second timing subunit is electrically connected to the secondary over-extraction protection unit, the second duration control unit, and the first reference frequency generator, respectively; the third timing subunit is electrically connected to the secondary over-extraction protection unit, the third duration control unit, and the first reference frequency generator, respectively; the third duration control unit is electrically connected to the second timing subunit; when the secondary over-extraction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second timing subunit starts timing; when the secondary over-extraction protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the third timing subunit starts timing; when the secondary over-extraction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the third timing subunit stops timing; when the third duration control unit determines that the timing duration of the third timing subunit is greater than or equal to the third preset duration, it outputs a reset signal to the second timing subunit to stop the second timing unit from timing and set the timing duration to zero; or... The second timing unit includes a second reference frequency generator and a second timing subunit, and the third timing unit includes a third timing subunit; wherein, the second reference frequency generator is electrically connected to the secondary over-extraction protection unit, the second timing subunit is electrically connected to the second duration control unit and the second reference frequency generator respectively, the third timing subunit is electrically connected to the secondary over-extraction protection unit, the third duration control unit and the second reference frequency generator respectively, and the third duration control unit is electrically connected to the second timing subunit and the second reference frequency generator respectively. When the secondary over-extraction protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the second... The reference frequency generator starts working, and the second timing subunit starts timing. When the secondary over-sucking protection unit determines that the voltage of the heat detection pin is less than the third reference voltage or greater than the fourth reference voltage, the third timing subunit starts timing. When the secondary over-sucking protection unit determines that the voltage of the heat detection pin is greater than the third reference voltage or less than the fourth reference voltage, the third timing subunit stops timing. When the third duration control unit determines that the timing duration of the third timing subunit is greater than or equal to the third preset duration, it outputs a reset signal to the second timing subunit and the second reference frequency generator to set the timing duration of the second timing unit to zero and to stop the second reference frequency generator from working; or... The third preset duration is less than one-tenth of the second preset duration.

9. The battery protection chip according to any one of claims 1-7, characterized in that, The second switch control pin includes a charging control pin and a discharging control pin. The charging control pin is used to be electrically connected to the control terminal of the charging switch unit, and the discharging control pin is used to be electrically connected to the control terminal of the discharging switch unit. When the timing duration of the logic control unit is greater than or equal to the second preset duration, the logic control unit controls the discharging control pin to keep the discharging switch unit open.

10. The battery protection chip according to any one of claims 1-7, characterized in that, The battery protection chip includes a battery protection module, which further includes a charging detection unit. The charging detection unit is electrically connected to the logic control unit and the heat detection pin. When the charging detection unit detects a charging signal, the second switching unit is turned on.

11. The battery protection chip according to any one of claims 1-7, characterized in that, The second preset duration is adjustable.

12. The battery protection chip according to claim 11, characterized in that, The logic control unit includes an oversinking logic unit, which includes either a first reference frequency generating unit or a second reference frequency generating unit. The first or second reference frequency generating unit includes a frequency comparator, a frequency switching unit, a first current source, and a frequency capacitor pin. A first terminal of the first current source is electrically connected to a power supply pin, and a second terminal of the first current source is electrically connected to a first terminal of the frequency switching unit, one input terminal of the frequency comparator, and the frequency capacitor pin. The other input terminal of the frequency comparator is connected to a preset first frequency reference voltage. The output terminal of the frequency comparator is electrically connected to the control terminal of the frequency switching unit. The second terminal of the frequency switching unit is electrically connected to a second ground pin. The frequency capacitor pin is used to connect to a frequency capacitor. The second preset duration is proportional to the capacitance value of the frequency capacitor. Alternatively... The logic control unit includes an oversinking logic unit, which includes either a first reference frequency generating unit or a second reference frequency generating unit. The first or second reference frequency generating unit includes a frequency comparator, a frequency operational amplifier, a frequency switching unit, a first current source, a second current source, a frequency capacitor, and a frequency resistor pin. The first current source includes a first frequency MOSFET, and the second current source includes a second frequency MOSFET. The sources of both the first and second frequency MOSFETs are electrically connected to a power supply pin, and the gates of both are electrically connected, both connected to the output of the frequency operational amplifier. One input terminal of the frequency amplifier is connected to a preset second frequency reference voltage. The other input terminal of the frequency operational amplifier is electrically connected to the drain of the second frequency MOSFET. The drain of the second frequency MOSFET is also electrically connected to the frequency resistor pin. The drain of the first frequency MOSFET is electrically connected to the first terminal of the frequency switching unit, one input terminal of the frequency comparator, and the first terminal of the frequency capacitor. The other input terminal of the frequency comparator is connected to a preset first frequency reference voltage. The output terminal of the frequency comparator is electrically connected to the control terminal of the frequency switching unit. The second terminal of the frequency switching unit and the second terminal of the frequency capacitor are both electrically connected to the second ground pin. The frequency resistor pin is used to electrically connect to the frequency resistor. The second preset duration is proportional to the resistance value of the frequency resistor.

13. A battery component for use in electronic cigarettes, characterized in that, include: Battery; The battery protection chip as described in any one of claims 1-12, wherein the power supply terminal and the second ground terminal of the battery protection chip are electrically connected to the two ends of the battery respectively. The second switching unit has a first end electrically connected to the positive or negative terminal of the battery, a second end electrically connected to the atomizing component, a second end electrically connected to the heat detection pin, and a control end electrically connected to the second switch control pin.

14. An electronic cigarette, characterized in that, The device includes an atomizing component, which includes a system control circuit and a heating element. The system control circuit includes a first switching unit and a system control module. The control terminal of the first switching unit is electrically connected to the system control module. The first switching unit and the heating element are connected in series to form a heating branch. It also includes a battery protection chip as described in any one of claims 1-12 or a battery assembly as described in claim 13, wherein one end of the heating branch is used to be electrically connected to one end of the battery via a second switching unit, and the other end of the heating branch is used to be electrically connected to the other end of the battery.

15. The electronic cigarette according to claim 14, characterized in that, The system control module includes a battery terminal and a first ground terminal, which are used to electrically connect to the two ends of the battery assembly. The first switching unit is an NMOS transistor, or the heating element is electrically connected to the battery terminal via the first switching unit. When the secondary over-sinking protection unit determines that the voltage of the heating detection pin is greater than a preset third reference voltage, the logic control unit starts timing. When the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switching unit to remain open; or... The system control module includes a battery terminal and a first ground terminal, which are used to electrically connect to the two ends of the battery assembly. The first switching unit is a PMOS transistor or the heating element is used to electrically connect to the first ground terminal via the first switching unit. When the secondary over-sinking protection unit determines that the voltage of the heating detection pin is less than the preset fourth reference voltage, the logic control unit starts timing. When the timing duration of the logic control unit is greater than or equal to the second preset duration, the logic control unit controls the second switching unit to remain open.

16. The electronic cigarette according to claim 14, characterized in that, The system control module includes an airflow detection terminal and a system control unit. The airflow detection terminal is electrically connected to an airflow detection element and the system control unit. The system control unit includes a first timing unit. When the system control unit detects airflow through the airflow detection element, the first timing unit starts timing, and the system control unit drives a first switching unit to work. When the system control unit does not detect airflow through the airflow detection element, the first timing unit stops timing and sets the time to zero, and the system control unit stops driving the first switching unit to stop it from working. When the timing duration of the first timing unit is greater than or equal to a first preset duration, the system control unit stops driving the first switching unit to stop it from working, and the first preset duration is less than a second preset duration.

17. The electronic cigarette according to claim 16, characterized in that, The ratio of the second preset duration to the first preset duration is in the range of 1.1:1 to 2:1; or, Both the first preset duration and the second preset duration are adjustable.

18. The electronic cigarette according to any one of claims 14-17, characterized in that, The system control module drives the first switching unit to work through PWM or PFM, or the system control module drives the first switching unit to work through normally open conduction.

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