System control circuit and electronic cigarette

Abstract

The application provides a system control circuit applied to an electronic cigarette, comprising a system control module and a first switch unit, the system control module comprising a battery end, a first ground end and a system control unit; the system control module further comprises a branch detection unit, the branch detection unit is used for obtaining a second detection voltage, the second detection voltage is used for representing whether a heating branch is turned on, the system control unit comprises a secondary over-charge protection unit, the secondary over-charge protection unit is electrically connected with the branch detection unit, when the secondary over-charge protection unit judges that the heating branch is turned on according to the second detection voltage, the secondary over-charge protection unit starts timing, when the timing length of the secondary over-charge protection unit is greater than or equal to a second preset time length, the secondary over-charge protection unit is used for controlling the first switch unit to stop working. The application further provides an electronic cigarette.

Description

Technical Field

[0001] This application relates to the field of electronic cigarette technology, and more particularly to a system control circuit and an electronic cigarette. Background Technology

[0002] Existing e-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 B1 and the ground terminal. 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 (e.g., °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 system control circuit and an electronic cigarette, which can prevent the first switching unit from working for a long time.

[0008] To address at least some of the aforementioned technical problems, a first aspect of this application provides a system control circuit for electronic cigarettes, including a system control module and a first switching unit. The system control module includes a battery terminal, a first ground terminal, and a system control unit. The battery terminal and the first ground terminal are electrically connected to the two ends of a battery assembly. The system control unit includes a switch control unit, which is electrically connected to the control terminal of the first switching unit. The control terminal of the first switching unit is electrically connected to the system control unit. The first switching unit is connected in series with a heating element to form at least a partial heating branch.

[0009] The system control module further 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. The system control unit includes a secondary over-suction protection unit, which is electrically connected to the branch detection unit. When the secondary over-suction protection unit determines that the heating branch is conducting based on the second detection voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to a second preset duration, the secondary over-suction protection unit is used to control the first switching unit to remain stopped.

[0010] Optionally, the branch detection unit includes an atomizing end, which is used to be electrically connected to the first switching unit and the heating element respectively, and the second detection voltage is determined based on the voltage of the atomizing end.

[0011] Optionally, the second detection voltage is the voltage of the atomizing end. When the secondary over-suction protection unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to the second preset duration, the secondary over-suction protection unit is used to control the first switching unit to remain stopped.

[0012] Optionally, the branch detection unit further includes a current detection unit, which is electrically connected to the atomizing end. The current detection unit is used to obtain a third detection voltage that is proportional to the current flowing through the heating branch, and the second detection voltage is determined based on the third detection voltage.

[0013] Optionally, one end of the first switching unit is electrically connected to the battery terminal, and the other end of the first switching unit is electrically connected to the atomizing terminal; the second detection voltage is the third detection voltage, and the current detection unit includes a first detection MOSFET, a first detection operational amplifier, a second detection MOSFET, and a third detection resistor. The gate of the first detection MOSFET is electrically connected to the gate of the first switching unit, its source is electrically connected to the battery terminal, its drain is electrically connected to the non-inverting terminal of the first detection operational amplifier, the inverting terminal of the first detection operational amplifier is electrically connected to the atomizing terminal, the non-inverting terminal of the first detection operational amplifier is also electrically connected to the source of the second detection MOSFET, the output terminal of the first detection operational amplifier is electrically connected to the gate of the second detection MOSFET, the drain of the second detection MOSFET is electrically connected to one end of the third detection resistor, and the other end of the third detection resistor is connected to the first ground terminal. The third detection voltage is the voltage at the drain of the second detection MOSFET; or...

[0014] One end of the first switching unit is electrically connected to the first ground terminal, and the other end of the first switching unit is electrically connected to the atomizing terminal; the second detection voltage is the third detection voltage. The current detection unit includes a first detection MOS transistor, a first detection operational amplifier, a second detection MOS transistor, and a third detection resistor. The gate of the first detection MOS transistor is electrically connected to the gate of the first switching unit, its drain is electrically connected to the first ground terminal, its source is electrically connected to the inverting terminal of the first detection operational amplifier, the non-inverting terminal of the first detection operational amplifier is electrically connected to the atomizing terminal, the inverting terminal of the first detection operational amplifier is also electrically connected to the drain of the second detection MOS transistor, the output terminal of the first detection operational amplifier is electrically connected to the gate of the second detection MOS transistor, the source of the second detection MOS transistor is electrically connected to one end of the third detection resistor, and the other end of the third detection resistor is connected to the battery terminal. The third detection voltage is the voltage at the source of the second detection MOS transistor.

[0015] Optionally, the branch detection unit further includes a voltage divider detection unit, which is electrically connected to the atomizing end. The voltage divider detection unit is used to obtain a voltage divider that is proportional to the voltage drop of the heating element, and the second detection voltage is determined based on the voltage divider.

[0016] Optionally, one end of the first switching unit is electrically connected to the battery terminal, and the other end of the first switching unit is electrically connected to the atomizing terminal; the second detection voltage is equal to the voltage divider voltage, the voltage divider detection unit includes a fourth detection resistor and a fifth detection resistor, one end of the fourth detection resistor is electrically connected to the atomizing terminal, the other end of the fourth detection resistor is electrically connected to one end of the fifth detection resistor, and the other end of the fifth detection resistor is electrically connected to the first ground terminal; the voltage divider voltage is the voltage at the connection point of the fourth and fifth detection resistors; or...

[0017] One end of the first switching unit is electrically connected to the first ground terminal, and the other end of the first switching unit is electrically connected to the atomizing terminal; the second detection voltage is equal to the voltage divider voltage, and the voltage divider detection unit includes a fourth detection resistor and a fifth detection resistor. One end of the fourth detection resistor is electrically connected to the battery terminal, and the other end of the fourth detection resistor is electrically connected to one end of the fifth detection resistor. The other end of the fifth detection resistor is electrically connected to the atomizing terminal, and the voltage divider voltage is the voltage at the connection point of the fourth and fifth detection resistors.

[0018] Optionally, the branch detection unit includes a control terminal of the first switching unit, and the second detection voltage is determined based on the voltage of the control terminal of the first switching unit.

[0019] Optionally, the second detection voltage is the voltage at the control terminal of the first switching unit. When the secondary over-suction protection unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to the second preset duration, the secondary over-suction protection unit is used to control the first switching unit to remain stopped.

[0020] Optionally, the heating branch includes a first switching unit, a heating element, and a second detection resistor connected in series. The branch detection unit includes a heating detection terminal, which is used to electrically connect to a detection connection point. The detection connection point is either the connection point of the first switching unit and the second detection resistor or the connection point of the heating element and the second detection resistor. The second detection voltage is determined based on the voltage of the heating detection terminal.

[0021] Optionally, the second detection voltage is the voltage of the heat detection terminal. When the secondary over-suction protection unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to the second preset duration, the secondary over-suction protection unit is used to control the first switching unit to remain stopped.

[0022] Optionally, the secondary over-suction protection unit is electrically connected to the switch control unit. When the secondary over-suction protection unit determines that the heating branch is conducting based on the second detection voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to the second preset duration, the secondary over-suction protection unit controls the first switch unit to remain off through the switch control unit so that the first switch unit remains stopped working.

[0023] Optionally, the secondary over-suction protection unit includes an over-suction comparison unit and an over-suction logic unit. One input terminal of the over-suction comparison unit is connected to a second detection voltage, and the other input terminal of the over-suction comparison unit is connected to a preset first reference voltage or a preset second reference voltage. The output terminal of the over-suction comparison unit is electrically connected to the over-suction logic unit, and the over-suction logic unit is used to be electrically connected to the switch control unit or the battery protection circuit of the battery assembly.

[0024] Optionally, 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 over-suction comparison unit, and the output terminal of the second timing unit is electrically connected to the second duration control unit. When the over-suction comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the second timing unit starts timing. When the over-suction comparison unit determines that the second detection voltage is less than the first reference voltage or greater than the second 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 secondary over-suction protection signal to control the first switching unit to remain stopped.

[0025] Optionally, the second timing unit includes a first reference frequency generating unit and a second timing subunit; wherein, the second timing subunit is electrically connected to the over-absorption comparison unit, the second duration control unit, and the first reference frequency generating unit, respectively; when the over-absorption comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the second timing subunit starts timing; when the over-absorption comparison unit determines that the second detection voltage is less than the first reference voltage or greater than the second reference voltage, the second timing subunit stops timing; or,

[0026] The second timing unit includes a second reference frequency generating unit and a second timing subunit; the second reference frequency generating unit is electrically connected to the over-absorption comparison unit, and the second timing subunit is electrically connected to the second duration control unit and the second reference frequency generating unit respectively. When the over-absorption comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the second reference frequency generating unit starts to work; when the over-absorption comparison unit determines that the second detection voltage is less than the first reference voltage or greater than the second reference voltage, the second reference frequency generating unit stops working.

[0027] Optionally, the over-sucking 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 over-sucking comparison 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. When the over-sucking comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the second timing unit starts timing. When the over-sucking comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the second timing unit starts timing. When the voltage is less than the first reference voltage or greater than the second reference voltage, the third timing unit starts timing. When the over-suction comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second 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 secondary over-suction protection unit is used to control the first switching unit to remain stopped.

[0028] Optionally, the second timing unit includes a first reference frequency generating unit 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 over-absorption comparison unit, the second duration control unit, and the first reference frequency generating unit, respectively; the third timing subunit is electrically connected to the over-absorption comparison unit, the third duration control unit, and the first reference frequency generating unit, respectively; the third duration control unit is electrically connected to the second timing subunit; when the over-absorption comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the second timing subunit starts timing; when the over-absorption comparison unit determines that the second detection voltage is less than the first reference voltage or greater than the second reference voltage, the third timing subunit starts timing; when the over-absorption comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second 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 a 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...

[0029] The second timing unit includes a second reference frequency generating unit and a second timing subunit, and the third timing unit includes a third timing subunit; wherein, the second reference frequency generating unit is electrically connected to the over-absorption comparison unit, the second timing subunit is electrically connected to the second duration control unit and the second reference frequency generating unit respectively, the third timing subunit is electrically connected to the over-absorption comparison unit, the third duration control unit and the second reference frequency generating unit respectively, and the third duration control unit is electrically connected to the second timing subunit and the second reference frequency generating unit respectively, and when the over-absorption comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the... The second reference frequency generating unit starts working, and the second timing subunit starts timing. When the over-sucking comparison unit determines that the second detection voltage is less than the first reference voltage or greater than the second reference voltage, the third timing subunit starts timing. When the over-sucking comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second 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 generating unit to set the timing duration of the second timing unit to zero and to stop the second reference frequency generating unit from working; or...

[0030] The third preset duration is less than one-tenth of the second preset duration.

[0031] Optionally, the second preset duration is adjustable.

[0032] Optionally, the secondary over-absorption protection unit 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 terminal. The first terminal of the first current source is electrically connected to the battery terminal. 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 terminal. 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 first ground terminal. The frequency capacitor terminal is used to connect to the frequency capacitor. The second preset duration is used to be proportional to the capacitance value of the frequency capacitor. Alternatively...

[0033] 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. 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 the battery terminal, and the gates of both are electrically connected, both connected to the output terminal of the frequency operational amplifier. One input terminal 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 terminal. 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 first ground terminal. The frequency resistor terminal 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.

[0034] Optionally, the system control module and the first switching unit are located on the same chip, the battery terminal is a battery pin, and the first ground terminal is a first ground pin; or,

[0035] The system control module is located on the third chip, the first switch unit is located outside the third chip, the battery terminal is the battery pin, the first ground terminal is the first ground pin, and the system control module also includes a first switch control pin, which is electrically connected to the control terminal of the first switch unit.

[0036] A second aspect of this application provides an electronic cigarette, comprising:

[0037] A battery assembly, which includes a battery;

[0038] The atomizing component includes the aforementioned system control circuit. The atomizing component also includes a heating element. The battery terminal and the first ground terminal of the system control circuit are electrically connected to the two ends of the battery component. The first switching unit of the system control circuit is connected in series with the heating element to form at least a partial heating branch. The heating branch is connected in parallel with the system control module to form a parallel circuit.

[0039] The battery, the heating branch, and the system control module are connected to form at least a partial discharge main circuit, and the battery is electrically connected to the parallel circuit.

[0040] Optionally, the system control module includes an airflow detection terminal for electrical connection with an airflow detection element. The system control unit includes an airflow detection unit, a first timing unit, and a first duration control unit. The airflow detection unit is electrically connected to the airflow detection terminal, the first timing unit, and the switch control unit. The first duration control unit is electrically connected to the switch control unit and the first timing unit. When the airflow detection unit detects airflow through the airflow detection element, the first timing unit starts timing, and the switch control unit drives the first switch unit to work. When the airflow detection unit does not detect airflow through the airflow detection element, the first timing unit stops timing and sets it to zero, and the switch control unit stops driving the first switch 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 first duration control unit stops driving the first switch unit through the switch control unit to stop it from working, and the first preset duration is less than a second preset duration.

[0041] Optionally, the airflow detection unit is electrically connected to the first timing unit, and the airflow detection unit triggers the first timing unit to reset to zero via an edge.

[0042] 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,

[0043] Both the first preset duration and the second preset duration are adjustable.

[0044] Optionally, the switch control unit drives the first switch unit to work via PWM or PFM, or the switch control unit drives the first switch unit to work via a normally-on conduction mode.

[0045] Optionally, the battery assembly further includes a battery protection circuit, which includes a second switching unit and a battery protection module. The battery protection module includes a power supply terminal, a second ground terminal, 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 terminal and the second ground terminal 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 and the discharge overcurrent protection unit. The control terminal of the second switching unit is electrically connected to the logic control unit. The second switching unit is used to control whether the battery supplies power to the atomizing component. The battery, the second switching unit, and the parallel circuit are connected in series to form the discharge main circuit.

[0046] The battery protection module includes an over-suction receiver, and the system control module includes an over-suction control terminal. The over-suction control terminal is electrically connected to the secondary over-suction protection unit, and the over-suction receiver is electrically connected to the over-suction control terminal. The over-suction receiver is also electrically connected to the logic control unit or the over-discharge voltage protection unit. When the timing of the secondary over-suction protection unit is greater than or equal to a second preset duration, the secondary over-suction protection unit outputs a sleep signal to the logic control unit or outputs an over-discharge signal to the over-discharge voltage protection unit. The logic control unit controls the battery protection circuit to enter a sleep mode. In the sleep mode, the second switching unit remains open to keep the discharge main circuit open and the first switching unit remains stopped working.

[0047] Optionally, the battery assembly further includes a battery protection circuit, which includes a second switching unit and a battery protection module. The battery protection module includes a power supply terminal, a second ground terminal, 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 terminal and the second ground terminal 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 and the discharge overcurrent protection unit. The control terminal of the second switching unit is electrically connected to the logic control unit. The second switching unit is used to control whether the battery supplies power to the atomizing assembly.

[0048] The system control module includes an over-suction control terminal and a fourth switching unit. The system control circuit also includes an over-discharge resistor. The fourth switching unit, the over-discharge resistor, and the over-suction control terminal are connected in series to form an over-discharge series circuit. The control terminal of the fourth switching unit is electrically connected to the secondary over-suction protection unit. One end of the over-discharge series circuit is connected to the first ground terminal, and the other end of the over-discharge series circuit is electrically connected to the power supply terminal. The battery assembly also includes a first resistor. The power supply terminal is electrically connected to the positive terminal of the battery through the first resistor. When the timing of the secondary over-suction protection unit is greater than or equal to a second preset duration, the secondary over-suction protection unit controls the fourth switching unit to turn on. The over-discharge voltage protection unit outputs a sleep signal to the logic control unit. The logic control unit controls the battery protection circuit to enter sleep mode. In sleep mode, the second switching unit remains open.

[0049] Optionally, the resistance ratio of the over-discharge resistor to the first resistor is less than 2:1.

[0050] 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.

[0051] This embodiment of the application sets the secondary over-inhalation protection unit to keep the first switching unit inactive when the timing duration of the secondary over-inhalation protection unit is greater than or equal to a second preset duration. When the first switching unit stops working, the heating branch also stops operating, thus preventing the heating element and the first switching unit from generating heat. The temperature of the first switching unit and its surroundings will not rise further, preventing damage to the first switching unit or system control module due to high temperatures, which could exacerbate damage to the e-cigarette and, in particular, prevent fires. Furthermore, this embodiment uses the first switching unit in the system control circuit or the second switching unit in the battery protection circuit, eliminating the need for additional switching units. Only simple modifications are required to achieve the secondary over-inhalation protection function. The peripheral components of the system control circuit remain almost unchanged, incurring minimal or no additional cost. Moreover, the secondary over-inhalation protection scheme of this application is compatible with existing e-cigarettes, making it widely applicable. Additionally, the addition of the secondary over-inhalation protection function in this embodiment enhances the reliability and safety of the e-cigarette. Attached Figure Description

[0052] 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.

[0053] Figure 1 This is a circuit module diagram of an existing atomizing component;

[0054] Figure 2 This is a circuit block diagram of the electronic cigarette according to the first embodiment of this application;

[0055] Figure 3a This is a partial block diagram of the system control circuit of the first embodiment;

[0056] Figure 3b This is a schematic diagram showing the connection between the secondary oversucking protection unit and the oversucking logic unit in the first embodiment;

[0057] Figure 3c 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;

[0058] Figure 3d This 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;

[0059] Figure 3e 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;

[0060] Figure 4 This is a circuit module diagram of an electronic cigarette according to another embodiment of this application;

[0061] Figure 5 This is a circuit block diagram of the electronic cigarette according to the second embodiment of this application;

[0062] Figure 6 This is a circuit module diagram of an electronic cigarette according to another embodiment of this application;

[0063] Figure 7a This is a circuit module diagram of the electronic cigarette according to the third embodiment of this application;

[0064] Figure 7b This is a partial block diagram of the system control circuit of the third embodiment of this application;

[0065] Figure 7c This is a circuit module diagram of an electronic cigarette according to another embodiment of this application;

[0066] Figure 7d This is a circuit module diagram of an electronic cigarette according to another embodiment of this application;

[0067] Figure 7e This is a circuit block diagram of an electronic cigarette according to another embodiment of this application;

[0068] 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;

[0069] 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;

[0070] Figure 10 This is a partial block diagram of the system control circuit of the fifth embodiment of this application;

[0071] Figure 11 This is a partial block diagram of the system control circuit of the sixth embodiment of this application;

[0072] Figure 12 This is a partial block diagram of the system control circuit of the seventh embodiment of this application;

[0073] Figure 13a This is a circuit block diagram of the electronic cigarette according to the eighth embodiment of this application;

[0074] Figure 13b This is a partial block diagram of the system control circuit of the eighth embodiment of this application;

[0075] Figure 14 This is a circuit block diagram of an electronic cigarette according to the ninth embodiment of this application. Detailed Implementation

[0076] 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.

[0077] 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.

[0078] Please see Figure 2 This 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 110) and a battery protection circuit 120, which are generally packaged together to provide power. Alternatively, in other embodiments of this application, the battery assembly 100 may not include the battery protection circuit. The atomizing assembly 200 is electrically connected to the battery assembly 100, and the battery assembly 100 supplies power to 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 heats the e-liquid to atomize and produce smoke, and the airflow detection element 240 detects whether there is airflow within the electronic cigarette.

[0079] 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. 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.

[0080] In this application, the battery protection module 130 is used to protect the battery 110, preventing permanent damage to the battery 110 due to over-discharge, over-current discharge, or other conditions. The battery protection module 130 includes a power supply terminal VDD, a second ground terminal GND2, an over-discharge voltage protection unit, an over-current discharge protection unit, a system terminal VM, a first reference voltage generation unit, and a logic control unit. 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, allowing the battery 110 to 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; however, the system terminal VM may also have other functions.

[0081] In this application, the first reference voltage generating unit provides a reference voltage for the over-discharge voltage protection unit, the over-discharge current protection unit, etc., to determine whether the battery 110 is in an over-discharge voltage state, an over-discharge current state, etc. The over-discharge voltage protection unit protects the battery 110 during discharge when it detects that the battery 110 voltage is lower than the reference voltage provided by the first reference voltage generating unit. For example, it controls the battery 110 to only discharge to a minimum, generally stopping power supply to the atomizing component 200 to prevent the battery 110 from being over-discharged and causing permanent damage. The logic control unit controls the operating state and control logic of each module of the battery protection circuit 120, controlling whether the battery 110 discharges externally and whether the battery 110 is charged.

[0082] In one embodiment of this application, the electronic cigarette has a charging function, in which case the battery protection module 130 may further include an overcharge voltage protection unit and a charging overcurrent protection unit. Alternatively, in another embodiment of this application, the electronic cigarette may not have a charging function, in which case charging protection is not required. Furthermore, in this embodiment, the battery protection module 130 also includes a short-circuit protection unit, a temperature protection unit, and a reference frequency generation unit.

[0083] In this application, the battery protection circuit 120 further includes a second switching unit 140. The first terminal of the second switching unit 140 is connected to the negative terminal or the positive terminal of the battery, the second terminal of the second switching unit 140 is connected to the atomizing component, and the second terminal of the second switching unit 140 is also connected to the system terminal VM.

[0084] In this application, the second switching unit 140 includes a charging switching unit and a discharging switching unit (generally external to the first switching unit 210, but can also be internal). The charging switching unit and the discharging switching unit are MOS or other suitable field-effect transistors, such as NMOS, PMOS, etc. The charging switching unit and the discharging switching unit are electrically connected to the logic control unit. The second switch control terminal CO / DO of the battery protection module 130 includes a charging switching control terminal and a discharging switching control terminal. The charging switching control terminal is electrically connected to the control terminal of the charging switching unit, and the discharging switching control terminal is electrically connected to the control terminal of the discharging switching unit. The charging switching control terminal and the discharging switching control terminal are respectively electrically connected to the logic control unit, realizing the logic control unit's separate control of the charging switching unit and the discharging switching unit. When it is necessary to control the discharge to stop, the logic control unit controls the discharging switching unit to be turned off through the discharging switching control terminal. At this time, the charging switching unit is generally turned on, and the battery 110 can be charged. 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 through the second switch control terminal CO / DO. The substrate control circuit is electrically connected to the logic control unit. 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 controls the switching transistor to open 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 110 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 be implemented in other ways, such as including only one switching transistor, in which case the switching transistor controls the discharge.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 1. Please see Figure 2The 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 first switching unit 210 remains inactive, 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 110 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.

[0090] 2. Please see Figure 4 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, and the system control module 272 is located on a third chip). The first terminal 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 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 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. In other embodiments of this application, the system control module 272 may not have an atomizing end AT (pin), in which case the second end of the first switching unit 210 is electrically connected to one end of the heating element 250.

[0091] 3. Please see Figure 5The 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.

[0092] 4. Please see Figure 6 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, and the system control module 272 is located on a third chip). The first terminal 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 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 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. In other embodiments of this application, the system control module 272 may not have an atomizing end AT (pin), in which case the second end of the first switching unit 210 is electrically connected to one end of the heating element 250.

[0093] 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.

[0094] 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.

[0095] 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 state, the first switching unit 210 is not in operation.

[0096] 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 (period) 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.

[0097] 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 disconnected, thus ceasing to operate.

[0098] In this application, those skilled in the art can also add indicator elements, motors, etc., as needed. Indicator elements include, for example, LED lights, displays, etc., and these indicator 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 (pin) 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 charging voltage and charging current that conform to the charging curve of the battery 110.

[0099] When a user smokes for an extended period (over-inhalation), such as more than 15 or 20 seconds, the airflow detection element 240 is triggered during the smoking process. Alternatively, the airflow detection element 240 may be falsely triggered (over-inhalation) for an extended period during the logistics and transportation of the e-cigarette. 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.

[0100] To address the aforementioned issues, in this application, the system control unit 220 includes an airflow detection unit 281, a first timing unit, and a switch control unit 284 (see [link to application]). Figure 3aWhen the airflow detection unit 281 detects a large airflow through the airflow detection element 240—for example, by detecting whether there is airflow, and whether the airflow is large or small—the airflow detection unit 281 determines that there is airflow or a large airflow. At this time, the first timing unit starts timing, and the switch control unit 284 drives the first switching unit 210 to work in the above manner, and the heating element 250 heats up to achieve the e-liquid atomization effect. When the airflow detection unit 281 detects a small airflow or no airflow through the airflow detection element 240, the first timing unit stops timing, and the switch control unit 284 stops driving the first switching unit 210, and the first switching unit 210 remains off. When the airflow detection unit 281 detects through the airflow detection element 240 that the airflow holding time is relatively long, and when the duration of the timing by the first timing unit is greater than or equal to the first preset duration, the system control unit 220 also forcibly stops driving the first switching unit 210, and the first switching unit 210 remains off, thereby preventing the temperature of the first switching unit 210 from becoming too high. 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.

[0101] 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.

[0102] First Embodiment

[0103] Please see Figure 2In this embodiment, the first switching unit 210 is both top-mounted and built-in. Specifically, the first end 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 end 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 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 switching unit 140, or via the negative terminal of the battery 110. The atomizing terminal AT is the connection point between the first switching unit 210 and the heating element 250 (hereinafter referred to as the atomizing connection point). For other embodiments of this application, please refer to... Figure 4 The first switch unit 210 is positioned on the top and externally, and at this time the atomizing end AT is electrically connected to the atomizing connection point.

[0104] In this embodiment, when the first switching unit 210 is turned on, the heating branch is activated, and a large current flows through it, typically in the ampere range, such as 0.5A, 1A, or 2A. The voltage at the connection point (atomization 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 across the first switching unit 210. The voltage at the battery terminal BAT1 is either the voltage at the battery 110 or the voltage at the system terminal VM. The voltage drop between the first switching unit 210 and the second switching unit 140 is typically in the millivolt range. At this time, the voltage at the atomization connection point is generally greater than... The voltage at the atomizing end AT is relatively high at 3.2V. When the first switching unit 210 is turned off, the heating branch is disconnected, and no current flows in it. The voltage at the connection point between the first switching unit 210 and the heating element 250 is the voltage of the first ground terminal GND1, which is either 0 or the voltage of the system terminal VM. The voltage drop of the second switching unit 140 is generally in the microvolt range, typically 0 or in the microvolt range (the current on the second switching unit 140 is in the microampere range). At this time, the voltage at the atomizing connection point is generally less than 0.5V, and the voltage at the atomizing end AT is relatively low. 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.

[0105] Please see Figure 3aIn this embodiment, the system control unit 220 includes a primary over-suction protection unit 222, an airflow detection unit 221, and a switch control unit 224. The airflow detection unit 221 is electrically connected to the airflow detection element 240, the primary over-suction protection unit 222 is electrically connected to the airflow detection unit 221, and both the airflow detection unit 221 and the primary over-suction protection unit 222 are electrically connected to the switch control unit 224. The switch control unit 224 is electrically connected to the control terminal of the first switch unit 210.

[0106] In this embodiment, the first-level over-inhalation protection unit 222 includes a first timing unit and a first duration control unit. The first timing unit is electrically connected to the airflow detection unit 221, and the first duration control unit is electrically connected to both the first timing unit and the switch control unit 224. When the airflow detection unit 221 detects a large airflow through the airflow detection element 240—for example, by detecting whether the airflow is small or large through methods such as microphone switch activation, microphone capacitance change, or microphone capacitance frequency change—the airflow detection unit 221 determines that there is airflow, such as when the user is smoking. At this time, the first timing unit starts timing, and simultaneously, the switch control unit 224 drives the first switch unit 210 to work, and the heating element 250 to work, achieving the e-liquid atomization effect. When the airflow detection unit 221 detects a small or no airflow through the airflow detection element 240, the airflow detection unit 221 determines that the user has stopped smoking or is not smoking. At this time, the first timing unit stops timing, and simultaneously, the switch control unit 224 stops driving the first switch unit 210, and the first switch unit 210 stops working and remains off. When the airflow detection unit 221 detects a relatively long airflow time or a relatively long false trigger time through the airflow detection element 240, the first duration control unit determines that the duration of the timing by the first timing unit is greater than or equal to the first preset duration. The first duration control unit then outputs a shutdown signal to the switch control unit 224, which forcibly stops driving the first switch unit 210. The first switch unit 210 remains off, and at this time, first-level over-suction protection is performed. 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. In this embodiment, the first timing unit and the first duration control unit can refer to the second timing unit 420 and the second duration control unit 430 described below, and will not be repeated here. In this embodiment, the turn-on signal is, for example, a high level. Furthermore, in other embodiments of this application, those skilled in the art can also implement high and low level conversion using simple circuits, which is also within the scope of this application.

[0107] In this embodiment, after the airflow detection unit 221 continuously detects airflow and triggers the first-level over-suction protection, the first timing unit is reset when the airflow detection unit 221 changes from detecting airflow to no airflow or from no airflow to airflow. That is, the first timing unit is reset via edge triggering, such as by a rising or falling edge. Afterward, the first duration control unit returns to normal. In normal state, the first duration control unit outputs an on / off signal to the switch control unit 224. When the airflow detection unit 221 detects airflow again, it outputs an on / off signal to the switch control unit 224 and simultaneously sends a timing signal to the first timing unit. The first timing unit starts timing, and the first duration control unit still outputs an on / off signal, thereby the switch control unit 224 controls the first switch unit 210 to turn on.

[0108] In this embodiment, the system control module 272 further includes a branch detection unit, which is used to obtain a second detection voltage, used to characterize whether the heating branch is conducting. In this embodiment, the branch detection unit includes an atomizing end AT, and the voltage of the atomizing end AT is used to determine the second detection voltage. In this embodiment, the voltage of the atomizing end AT is the second detection voltage; however, in other embodiments, the voltage of the atomizing end AT can be converted to obtain the second detection voltage. In this embodiment, the system control module 272 can determine whether the heating branch is conducting based on the voltage of the atomizing end AT, and thus determine whether the heating element 250 is heating.

[0109] In this embodiment, the system control unit 220 further includes a secondary over-absorption protection unit 223. The secondary over-absorption protection unit 223 is electrically connected to the branch detection unit and the switch control unit 224, respectively. In this embodiment, it is electrically connected to the atomizing end AT. The secondary over-absorption protection unit 223 can determine whether the heating element 250 is heating by detecting the voltage of the atomizing end AT. Under normal conditions, the secondary over-absorption protection unit 223 outputs an on / off signal to the switch control unit 224.

[0110] Please refer to the above. Figure 3a and Figure 3bIn this embodiment, the secondary over-absorption protection unit 223 includes an over-absorption comparison unit 410, which is, for example, a voltage comparator. One input terminal of the over-absorption comparison unit 410 is electrically connected to the branch detection unit, which in this embodiment is electrically connected to the atomizing end AT. The other input terminal of the over-absorption comparison unit 410 is electrically connected to the third reference voltage generating unit. The third reference voltage generating unit generates a first reference voltage Vref1 and inputs it to the over-absorption comparison unit 410. In this embodiment, the first reference voltage Vref1 is generally between 0.5V and 3.2V, such as 0.5V, 1V, 1.5V, 2V, 2.5V, 3V, 3.2V, etc.

[0111] In this embodiment, when the first switching unit 210 is turned off, the heating branch is disconnected and no current flows. At this time, the voltage of the atomizing end AT is equal to the voltage of the first grounding end GND1. The voltage of the first grounding end GND1 is 0 or microvolts (the voltage drop of the second switching unit 140 is in the microvolt range), which is less than the first reference voltage Vref1. The over-absorption comparator unit 410 outputs a second level signal. When the first switching unit 210 is turned on, the heating branch is turned on and a large current flows through it, which is in the ampere range. At this time, the voltage of the atomizing end AT is close to the voltage of the battery end BAT1. The voltage of the battery end BAT1 is generally greater than 3.2V, which is greater than the first reference voltage Vref1. The over-absorption comparator unit 410 outputs a first level signal.

[0112] In this embodiment, the secondary over-suction protection unit 223 further includes an over-suction logic unit, which is electrically connected to the over-suction comparison unit 410 and also electrically connected to the switch control unit 224.

[0113] Please refer to the above. Figure 3a and Figure 3b In this embodiment, the over-snap logic unit includes a second timing unit 420 and a second duration control unit 430. The input terminal of the second timing unit 420 is electrically connected to the output terminal of the over-snap comparison unit 410, and the output terminal of the second timing unit 420 is electrically connected to the second duration control unit 430. The output terminal of the second duration control unit 430 is electrically connected to the switch control unit 224. Additionally, to lock and hold the signal at the output terminal of the second duration control unit 430, the over-snap logic unit may also include a trigger. The input terminal of the trigger is electrically connected to the output terminal of the second duration control unit 430, and the output terminal of the trigger is electrically connected to the switch control unit 224. Alternatively, a trigger may not be included.

[0114] In this embodiment, when there is airflow, the airflow detection unit 221 is triggered, the first timer starts timing, the first switch unit 210 is turned on, the over-suction comparison unit 410 determines that the voltage of the atomizing end AT is greater than the first reference voltage Vref1, at which time the over-suction comparison unit 410 outputs a first level signal, and the second timing unit 420 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 first switch unit 210 is turned off, the heating branch is not connected, and there is no current flowing in the heating branch. At this time, the over-suction comparison unit 410 determines that the voltage of the atomizing end AT is lower than the first reference voltage Vref1, the over-suction comparison unit 410 outputs a second level signal, the second timing unit 420 stops timing (edge-triggered or level-triggered) and sets the timing duration of the second timing unit 420 to zero, so that the second timing unit 420 can obtain the heating duration of the heating element 250 in real time and output it to the second duration control unit 430. In this embodiment, the first level signal is, for example, a high level or a low level, and the second level signal is, for example, a low level or a high level. 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.

[0115] When the primary over-suction protection unit 222 is damaged, or when the first switching unit 210 is not activated due to airflow issues or other problems, meaning the primary over-suction protection unit 222 will not be triggered or damaged, one possible fault scenario is that the first switching unit 210 remains continuously activated and will not be deactivated. In this case, the second timing unit 420 continuously times the signal without stopping or resetting it to zero. The second timing unit 420 outputs the timed duration to the second duration control unit 430 in real time. When the second duration control unit 430 detects that the duration of activation of the first switching unit 210 is greater than or equal to the second preset duration, the second duration control unit 430 outputs a secondary over-suction protection signal to the switch. The control unit 224 controls the first switch unit 210 to remain off, thus keeping it inactive. When the first switch unit 210 is turned off, the heating branch is disconnected, and the first switch unit 210 stops working. The heating element 250 will no longer heat up, and the temperature of the first switch unit 210 and its surroundings will not rise further. This prevents damage to the first switch unit 210 or the system control module 272 due to high temperatures, which could exacerbate damage to the electronic cigarette and, in particular, prevent fires. Furthermore, this embodiment adds a secondary over-inhalation protection unit 223 to supplement the primary over-inhalation protection unit 222. Moreover, it shares the existing first switch unit 210, eliminating the need for additional switch units and reducing costs.

[0116] Please continue reading Figure 2 and Figure 3bIn this embodiment, when the second duration control unit 430 learns that the duration of the first switch unit 210 being turned on is greater than or equal to a second preset duration, the second duration control unit 430 outputs a secondary over-sucking protection signal to the switch control unit 224. Simultaneously, the over-sucking logic unit locks the output of the secondary over-sucking protection signal to the switch control unit 224 and controls the timing duration of the second timing unit 420 to be set to zero. This helps reduce energy consumption. In this embodiment, the secondary over-sucking protection signal can be, for example, a shutdown signal, or a processed shutdown signal, as long as it enables the switch control unit 224 to control the first switch unit 210 to shut down.

[0117] In this embodiment, the switch control unit 224 includes logic gate circuits, such as AND gates. The three inputs of the AND gate are electrically connected to the primary over-suction protection unit 222, the secondary over-suction protection unit 223, and the airflow detection unit 221, respectively. The output of the AND gate is electrically connected to other circuit units within the switch control unit 224. In this embodiment, the switch control unit 224 only controls the first switch unit 210 to turn on when the primary over-suction protection unit 222, the secondary over-suction protection unit 223, and the airflow detection unit 221 all output on / off signals to the switch control unit 224. Under normal circumstances, both the primary over-suction protection unit 222 and the secondary over-suction protection unit 223 output on / off signals. In this embodiment, the airflow detection unit 221 is electrically connected to the primary over-suction protection unit 222 to send reset signals and timing start signals to the primary over-suction protection unit 222. In other embodiments of this application, the logic gate circuit can also be a combination of AND gate and NOT gate, a combination of OR gate and NAND gate, or a combination of AND gate, OR gate and NOT gate to realize the desired signal. The NOT gate can be located before or after the AND gate and OR gate. The number of NOT gate, AND gate and OR gate can be one or more. Those skilled in the art can set it according to actual needs to realize the desired function.

[0118] In this embodiment, when the second duration control unit 430 determines that the timing duration of the second timing unit 420 is greater than or equal to the second preset duration, it indicates that there is an abnormality in the internal circuit of the electronic cigarette or an abnormality in the usage environment of the electronic cigarette. The second duration control unit 430 outputs a secondary over-inhalation protection signal to the switch control unit 224, and the switch control unit 224 controls the first switch unit 210 to remain off, and the first switch unit 210 is locked off. In this embodiment, the atomizing component 200 also includes an activation circuit, which is electrically connected to the secondary over-inhalation protection unit 223. The activation circuit is used to output an activation signal to restore the over-inhalation logic unit to a normal state. In the normal state, the over-inhalation logic unit outputs an on-conduction signal to the switch control unit 224 to unlock the state. When the fault of the electronic cigarette is resolved, an activation command can be sent to the secondary over-inhalation protection unit 223 through the activation circuit to activate the electronic cigarette, and the electronic cigarette can resume normal use. In this embodiment, the activation circuit includes, for example, an activation button, and the activation command is triggered by the activation button or by a combination of the activation button and the duration.

[0119] To prevent the inconvenience caused by the electronic cigarette's primary over-inhalation protection being triggered directly before the secondary over-inhalation protection is activated (e.g., the electronic cigarette needs to be activated to work properly after the secondary over-inhalation protection is activated), in this embodiment, the second preset duration is longer than the first preset duration. This setting can prevent the secondary over-inhalation protection unit 223 from being triggered before the primary over-inhalation protection unit 222 has performed primary over-inhalation protection, thus affecting normal user operation. That is, the secondary over-inhalation protection will only be triggered when the primary over-inhalation protection unit 222 fails, is damaged, or when the first switching unit 210 is continuously turned on for a long time for reasons other than airflow. In this embodiment, the second preset duration is, for example, 10% longer than the first preset duration. For example, the second preset duration is 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 in the range of 1.1:1 to 2:1. Setting an upper limit for the ratio can prevent the secondary over-inhalation protection from causing further damage to the electronic cigarette and reducing the effectiveness of the secondary over-inhalation protection.

[0120] Please continue reading Figure 3bIn this embodiment, the second timing unit 420 includes a first reference frequency generating unit 422 and a second timing subunit 421. The first reference frequency generating unit 422 is electrically connected to the second timing subunit 421. One end of the second timing subunit 421 is electrically connected to the output terminal of the over-extraction comparison unit 410, and the other end of the second timing subunit 421 is electrically connected to the second duration control unit 430. The output terminal of the second duration control unit 430 is directly or indirectly electrically connected to the switch control unit 224. In one embodiment of this application, the second timing subunit 421 counts the number of cycles of the first reference frequency generating unit 422, and the product of the count and the frequency cycle is the duration. In another embodiment of this application, the second timing subunit 421 can also use the number of cycles obtained by counting to represent the duration, or it can use other conventional data to represent the duration. In this embodiment, the second timing subunit 421 starts timing by a first edge trigger or a first level trigger, and stops timing and sets the timing duration to zero by a second edge trigger or a second level trigger. In this embodiment, the first reference frequency generating unit 422 can be shared with other units in the system control module 272, which can save costs. The first reference frequency generating unit 422 is, for example, an oscillator.

[0121] In this embodiment, the first reference frequency generating unit 422 of the second timing unit 420 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 3cThe second timing unit 420 includes a second reference frequency generating unit 442 and a second timing subunit 421. The second reference frequency generating unit 442 is located between the second timing subunit 421 and the over-extraction comparator unit 410. Specifically, the input terminal of the second reference frequency generating unit 442 is electrically connected to the output terminal of the over-extraction comparator unit 410, and the output terminal of the second reference frequency generating unit 442 is electrically connected to the second timing subunit 421. The second reference frequency generating unit 442 generates a frequency signal by being triggered by a first edge or a first level, and stops generating a frequency signal by being triggered by a second edge or a second level, thereby reducing power consumption. Specifically, the over-absorption comparator 410 determines whether the voltage at the atomizing end AT is greater than the first reference voltage Vref1. When the voltage at the atomizing end AT changes from below the first reference voltage Vref1 to above the first reference voltage Vref1, the output level signal of the over-absorption comparator 410 changes. The second reference frequency generation unit 442 is triggered to generate a frequency signal upon receiving an edge signal or the changed level signal. The second timing subunit 421 starts timing according to the received frequency signal and outputs the real-time duration to the second duration control unit 430. When the voltage at the atomizing end AT changes from above the first reference voltage Vref1 to below the first reference voltage Vref1, the second reference frequency generation unit 442 stops generating the frequency signal, and the second timing subunit 421 stops timing and resets the timing duration to 0. The relationship between the second duration control unit 430 and the switch control unit 224 has been described above and will not be repeated here. In this embodiment, the second timing subunit 421 and the second duration control unit 430 can be implemented in one circuit module or separately.

[0122] In this embodiment, the second preset duration is adjustable. Three examples of adjustable second preset duration are provided, but the method is not limited to these three. Those skilled in the art can design other conventional duration-adjustable circuits according to actual needs. For the adjustment method of the first preset duration, please refer to the adjustment method of the second preset duration. In this embodiment, the ratio of the first preset duration to the second preset duration can be a fixed value, meaning that when the first preset duration is adjusted, the second preset duration is also adjusted accordingly. However, this application is not limited to this; in other embodiments of this application, the first preset duration and the second preset duration may not be adjustable.

[0123] 1. Please see Figure 3dThe first reference frequency generating unit 422 or the second reference frequency generating unit 442 includes a frequency comparator 331, a frequency switching unit PK1, a first current source 310, and a frequency capacitor terminal PC (pin). The first terminal of the first current source 310 is electrically connected to the battery terminal BAT1. 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 PVref1. 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 first ground terminal GND1. 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 3d 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 422 or the second reference frequency generating unit 442 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 C2. The parameter values ​​of the first reference frequency generating unit 422 or the second reference frequency generating unit 442 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 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 422 or the second reference frequency generating unit 442 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 set 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.

[0124] 2. Please see Figure 3eThe first reference frequency generating unit 422 or the second reference frequency generating unit 442 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 PR (pin). The first current source 310 includes a first frequency MOSFET PM1, and the second current source 320 includes a second frequency MOSFET PM2. The sources of both the first and second frequency MOSFETs PM1 and PM2 are electrically connected to the battery terminal BAT1. The gates of both MOSFETs PM1 and PM2 are electrically connected and connected to the output of the frequency operational amplifier 332. One input of the frequency operational amplifier 332 is connected to a preset second frequency reference voltage PVref2, and the other input 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 first frequency M... The drain of the OS transistor 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 PVref1. 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 connected to the first ground terminal GND1. The second terminal of the frequency capacitor C2 is connected to the first ground terminal GND1. 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 3eThe 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 422 or the second reference frequency generating unit 442 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 R2. The parameters of the first reference frequency generating unit 422 or the second reference frequency generating unit 442 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 422 or the second reference frequency generating unit 442 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.

[0125] 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.

[0126] In this embodiment, by setting the second preset duration to be adjustable, when electronic cigarettes with different first preset durations use the secondary over-inhalation 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 additional circuits, thus exhibiting strong compatibility. Moreover, different users, different brands, and different manufacturers have different requirements for the second preset duration. By designing the second preset duration to be adjustable, the requirements of different users, different brands, and different manufacturers can be met, thereby enhancing the market competitiveness of the system control circuit.

[0127] In this embodiment, obtaining the voltage of the atomizing end AT includes direct acquisition or indirect acquisition. The voltage obtained by direct acquisition is the voltage of the atomizing end AT, while the voltage obtained by indirect acquisition is generally not equal to the voltage of the atomizing end AT. For example, the voltage obtained through a voltage divider resistor (the branch detection unit includes a voltage divider resistor; please refer to embodiments five and six) is smaller than the voltage of the atomizing end AT. These are all conventional techniques or modifications in the art, and are also within the scope of protection of this application.

[0128] Second Embodiment

[0129] 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 first switch unit 210 is located at the bottom.

[0130] Please see Figure 5 In this embodiment, the first switching unit 210 is located at the bottom and is internally integrated. That is, the first end of the first switching unit 210 is electrically connected to the first grounding terminal GND1. The first grounding 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 terminal AT. 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 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 terminal 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 6 The first switch unit 210 is positioned both below and outside, and at this time the atomizing end AT is electrically connected to the atomizing connection point.

[0131] In this embodiment, when the first switching unit 210 is turned on, the heating branch is activated, and a large current flows through it, typically in the ampere range, such as 0.5A, 1A, or 2A. The voltage at the atomization connection point is the voltage of the first ground terminal GND1 plus the voltage drop across the first switching unit 210. The voltage drop across the first switching unit 210 and the second switching unit 140 is typically in the millivolt range. The voltage at the first ground terminal GND1 is close to 0 or is the voltage at the system terminal VM, typically in the 0 or millivolt range. At this time, the voltage at the atomization connection point is typically less than 0.5V. The voltage is relatively small; when the first switching unit 210 is turned off, the heating branch is disconnected and no current flows in the heating branch. The voltage at the atomization connection point is the voltage at the battery terminal BAT1, which is the voltage at the battery terminal BAT1 or the voltage at the system terminal VM. The voltage drop of the second switching unit 140 is generally at the microvolt level. At this time, the voltage at the atomization connection point is generally greater than 3.2V. Therefore, by judging the voltage at the connection point between the first switching unit 210 and the heating element 250, it can be determined whether the first switching unit 210 is on or off, and thus whether the heating element 250 is heating.

[0132] Please see Figure 3aIn this embodiment, the system control unit 220 includes a primary over-suction protection unit 222, an airflow detection unit 221, and a switch control unit 224. The airflow detection unit 221 is electrically connected to the airflow detection element 240, the primary over-suction protection unit 222 is electrically connected to the airflow detection unit 221, and both the airflow detection unit 221 and the primary over-suction protection unit 222 are electrically connected to the switch control unit 224. The switch control unit 224 is electrically connected to the control terminal of the first switch unit 210.

[0133] In this embodiment, the system control module 272 further includes a branch detection unit, which is used to obtain a second detection voltage, used to characterize whether the heating branch is conducting. In this embodiment, the branch detection unit includes an atomizing end AT, and the voltage of the atomizing end AT is used to determine the second detection voltage. In this embodiment, the voltage of the atomizing end AT is the second detection voltage; however, in other embodiments, the voltage of the atomizing end AT can be converted to obtain the second detection voltage. In this embodiment, the system control module 272 can determine whether the heating branch is conducting based on the voltage of the atomizing end AT, and thus determine whether the heating element 250 is heating.

[0134] In this embodiment, the system control unit 220 further includes a secondary over-absorption protection unit 223. The secondary over-absorption protection unit 223 is electrically connected to the branch detection unit and the switch control unit 224, respectively. In this embodiment, it is electrically connected to the atomizing end AT. The secondary over-absorption protection unit 223 can determine whether the heating element 250 is heating by detecting the voltage of the atomizing end AT. Under normal conditions, the secondary over-absorption protection unit 223 outputs an on / off signal to the switch control unit 224.

[0135] Please see Figure 3b In this embodiment, the secondary over-absorption protection unit 223 includes an over-absorption comparator unit 410, which is, for example, a voltage comparator. One input terminal of the over-absorption comparator unit 410 is electrically connected to the atomizing end AT, and the other input terminal of the over-absorption comparator unit 410 is electrically connected to a third reference voltage generating unit. The third reference voltage generating unit generates a second reference voltage Vref2 and inputs it to the over-absorption comparator unit 410. In this embodiment, the second reference voltage Vref2 is generally between 0.5V and 3.2V, such as 0.5V, 1V, 1.5V, 2V, 2.5V, 3V, 3.2V, etc.

[0136] In this embodiment, when the first switching unit 210 is turned off, the heating branch is disconnected and no current flows. At this time, the voltage of the atomizing end AT is equal to the voltage of the battery end BAT1. The voltage of the battery end BAT1 is generally greater than 3.2V, which is greater than the second reference voltage Vref2. The over-absorption comparator unit 410 outputs a second level signal. When the first switching unit 210 is turned on, the heating branch is turned on, and a large current flows through the heating branch, which is at the ampere level. At this time, the voltage of the atomizing end AT is close to the voltage of the first grounding end GND1. The voltage of the first grounding end GND1 is 0 or at the millivolt level (the voltage drop of the second switching unit 140 and the voltage drop of the first switching unit 210 are at the millivolt level), which is less than the second reference voltage Vref2. The over-absorption comparator unit 410 outputs a first level signal.

[0137] In this embodiment, the secondary over-suction protection unit 223 further includes an over-suction logic unit, which is electrically connected to the over-suction comparison unit 410 and also electrically connected to the switch control unit 224.

[0138] Please refer to the above. Figure 3a and Figure 3b In this embodiment, the over-snap logic unit includes a second timing unit 420 and a second duration control unit 430. The input terminal of the second timing unit 420 is electrically connected to the output terminal of the over-snap comparison unit 410, and the output terminal of the second timing unit 420 is electrically connected to the second duration control unit 430. The output terminal of the second duration control unit 430 is electrically connected to the switch control unit 224. Additionally, to lock and hold the signal at the output terminal of the second duration control unit 430, the over-snap logic unit may also include a trigger. The input terminal of the trigger is electrically connected to the output terminal of the second duration control unit 430, and the output terminal of the trigger is electrically connected to the switch control unit 224. Alternatively, a trigger may not be included.

[0139] In this embodiment, when there is airflow, the airflow detection unit 221 is triggered, the first timer starts timing, the first switch unit 210 is turned on, the over-suction comparison unit 410 determines that the voltage of the atomizing end AT is less than the second reference voltage Vref2, at this time the over-suction comparison unit 410 outputs a first level signal, and the second timing unit 420 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 first switch unit 210 is turned off, the heating branch is not connected, and there is no current flowing in the heating branch. At this time, the over-suction comparison unit 410 determines that the voltage of the atomizing end AT is greater than the second reference voltage Vref2, the over-suction comparison unit 410 outputs a second level signal, the second timing unit 420 stops timing (edge-triggered or level-triggered) and sets the timing duration of the second timing unit 420 to zero, so that the second timing unit 420 can obtain the heating duration of the heating element 250 in real time and output it to the second duration control unit 430. In this embodiment, the first level signal is, for example, a high level or a low level, and the second level signal is, for example, a low level or a high level. 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.

[0140] When the primary over-suction protection unit 222 is damaged, or when the first switching unit 210 is not activated due to airflow issues or other problems, meaning the primary over-suction protection unit 222 will not be triggered or damaged, one possible fault scenario is that the first switching unit 210 remains continuously activated and will not be deactivated. In this case, the second timing unit 420 continuously times the signal without stopping or resetting it to zero. The second timing unit 420 outputs the timed duration to the second duration control unit 430 in real time. When the second duration control unit 430 detects that the duration of activation of the first switching unit 210 is greater than or equal to the second preset duration, the second duration control unit 430 outputs a secondary over-suction protection signal to... The switch control unit 224 controls the first switch unit 210 to remain off, thus preventing it from operating. When the first switch unit 210 is turned off, the heating branch is disconnected, and the first switch unit 210 stops operating. The heating element 250 will no longer heat up, and the temperature of the first switch unit 210 and its surroundings will not rise further. This prevents damage to the first switch unit 210 or the system control module 272 due to high temperatures, thus avoiding further damage to the electronic cigarette and, most importantly, preventing fires. Furthermore, this embodiment supplements the protection provided by adding a secondary over-inhalation protection unit 223 to the primary over-inhalation protection unit 222. Moreover, it shares the existing first switch unit 210, eliminating the need for additional switch units and reducing costs.

[0141] Please continue reading Figure 5 and Figure 3aIn this embodiment, when the second duration control unit 430 learns that the duration of the first switch unit 210 being turned on is greater than or equal to a second preset duration, the second duration control unit 430 outputs a secondary over-sucking protection signal to the switch control unit 224. Simultaneously, the over-sucking logic unit locks and outputs a shutdown control signal to the switch control unit 224, and controls the timing duration of the second timing unit 420 to be set to zero. This helps reduce energy consumption. In this embodiment, the secondary over-sucking protection signal can be, for example, a shutdown signal, or a processed shutdown signal, as long as it enables the switch control unit 224 to control the first switch unit 210 to shut down.

[0142] In this embodiment, the switch control unit 224 includes logic gate circuits, such as AND gates. The three inputs of the AND gate are electrically connected to the primary over-suction protection unit 222 (see the first embodiment), the secondary over-suction protection unit 223, and the airflow detection unit 221, respectively. The output of the AND gate is electrically connected to other circuit units within the switch control unit 224. In this embodiment, the switch control unit 224 only controls the first switch unit 210 to turn on when the primary over-suction protection unit 222, the secondary over-suction protection unit 223, and the airflow detection unit 221 all output on / off signals to the switch control unit 224. Under normal circumstances, both the primary over-suction protection unit 222 and the secondary over-suction protection unit 223 output on / off signals. In this embodiment, the airflow detection unit 221 is electrically connected to the primary over-suction protection unit 222 to send reset signals and timing start signals to the primary over-suction protection unit 222.

[0143] In this embodiment, when the second duration control unit 430 determines that the timing duration of the second timing unit 420 is greater than or equal to the second preset duration, it indicates that there is an abnormality in the internal circuit of the electronic cigarette or an abnormality in the usage environment of the electronic cigarette. The second duration control unit 430 outputs a shutdown signal to the switch control unit 224, and the switch control unit 224 controls the first switch unit 210 to remain off, and the first switch unit 210 is locked off. In this embodiment, the atomizing component 200 also includes an activation circuit, which is electrically connected to the secondary over-inhalation protection unit 223. The activation circuit is used to output an activation signal to restore the over-inhalation logic unit to normal state. In the normal state, the over-inhalation logic unit outputs an on-conduction signal to the switch control unit 224 to unlock the state. When the fault of the electronic cigarette is resolved, an activation command can be sent to the secondary over-inhalation protection unit 223 through the activation circuit to activate the electronic cigarette, and the electronic cigarette can resume normal use. In this embodiment, the activation circuit includes, for example, an activation button, and the activation command is triggered by the activation button or by a combination of the activation button and the duration.

[0144] To prevent the inconvenience caused by the electronic cigarette's primary over-inhalation protection being triggered directly before the secondary over-inhalation protection is activated (e.g., the electronic cigarette needs to be activated to work properly after the secondary over-inhalation protection is activated), in this embodiment, the second preset duration is longer than the first preset duration. This setting can prevent the secondary over-inhalation protection unit 223 from being triggered before the primary over-inhalation protection unit 222 has performed primary over-inhalation protection, thus affecting normal user operation. That is, the secondary over-inhalation protection will only be triggered when the primary over-inhalation protection unit 222 fails, is damaged, or when the first switching unit 210 is continuously turned on for a long time for reasons other than airflow. In this embodiment, the second preset duration is, for example, 10% longer than the first preset duration. For example, the second preset duration is 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 in the range of 1.1:1 to 2:1. Setting an upper limit for the ratio can prevent the secondary over-inhalation protection from causing further damage to the electronic cigarette and reducing the effectiveness of the secondary over-inhalation protection.

[0145] Please continue reading Figure 3b or Figure 3c In this embodiment, the second timing unit 420 includes a first reference frequency generating unit 422 and a second timing subunit 421, or the second timing unit 420 includes a second-level reference frequency generating unit and a second timing subunit 421. For details, please refer to the first embodiment, which will not be repeated here.

[0146] In this embodiment, both the first preset duration and the second preset duration are adjustable. The method by which the first preset duration and the second preset duration are adjustable has been described in the first embodiment and will not be repeated here. However, this application is not limited thereto. In other embodiments of this application, the first preset duration and the second preset duration may not be adjustable, or only one of them may be adjustable.

[0147] Third Embodiment

[0148] Please see Figure 7a , Figure 7a This is a circuit block diagram of an electronic cigarette 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 that the heating branch is not detected by the atomizing end AT.

[0149] Please see Figure 7a and Figure 7bIn 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.

[0150] 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, to the positive terminal of the battery 110. 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 to 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.

[0151] Please continue reading Figure 7a In this embodiment, the system control module 272 includes a branch detection unit electrically connected to the heating branch. The branch detection unit 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 system control unit 220 includes a secondary over-suction protection unit 223, which is electrically connected to both the branch detection unit and the switch control unit 224.

[0152] In this embodiment, the branch detection unit includes a heat detection terminal GX, which 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, for example, the voltage drop of the second detection resistor 271. In this embodiment, the heat detection terminal GX is electrically connected to one input terminal of the over-absorption comparison unit 410 of the secondary over-absorption protection unit, and the other input terminal of the over-absorption comparison unit 410 is electrically connected to the third reference voltage generation unit 138, which is used to generate the first reference voltage Vref1.

[0153] In this embodiment, when there is airflow, the airflow detection unit 221 is triggered, the first timer starts counting, 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 at the heating detection terminal GX is the voltage at 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, the first switching unit 210 is turned off, and 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, and the voltage drop of the second switching unit 140 is generally in the microvolt level. In this embodiment, the first reference voltage Vref1 is greater than the voltage at the first ground terminal GND1 when the first switching unit 210 is turned off, and less than the voltage at 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 and the magnitude of the first reference voltage Vref1, it can be determined whether the first switching unit 210 is turned on. In this embodiment, the range of the first reference voltage Vref1 is between tens of microvolts and tens of millivolts, such as 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.

[0154] In this embodiment, how the over-absorption comparison unit 410 triggers the secondary over-absorption protection after obtaining the voltage at the detection terminal and the third reference voltage can be found in the first embodiment and the second embodiment, and will not be repeated here.

[0155] In addition, the position of the second sensing resistor 271 is not limited to Figure 7a As shown, in other embodiments of this application, please refer to Figure 7cThe 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, or 2A. 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 410 is electrically connected to the heating detection terminal GX, and the other input terminal is connected to the second reference voltage Vref2. In this embodiment, the second reference voltage Vref2 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 second reference voltage Vref2, 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.

[0156] In addition, the position of the second sensing resistor 271 is not limited to Figure 7a As shown, in other embodiments of this application, please refer to Figure 7dThe 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 of the second switching unit 140 is typically at the microvolt level. In this embodiment, one input terminal of the over-sucking comparator unit 410 is electrically connected to the heating detection terminal GX, and the other input terminal is connected to the second reference voltage Vref2. In this embodiment, the second reference voltage Vref2 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 second reference voltage Vref2, 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.

[0157] In addition, the position of the second sensing resistor 271 is not limited to Figure 7a As shown, in other embodiments of this application, please refer to Figure 7eThe 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 410 is electrically connected to the heating detection terminal GX, and the other input terminal is connected to the first reference voltage Vref1. Therefore, the first reference voltage Vref1 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 first reference voltage Vref1, 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.

[0158] 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.

[0159] Fourth embodiment

[0160] In the first to third embodiments, when the switch control unit 224 drives the first switch 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 switch unit 210 is turned on during the on-time and turned off during the off-time. Since there is only one second timing unit 420, the timing of the second timing unit 420 may have problems (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 in some situations, such as when the primary over-inhalation protection fails or is damaged, and prolonged airflow causes the system control unit 220 to continuously drive the first switch unit 210, failing to 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.

[0161] In this embodiment, the first switching unit 210 can be driven by either PWM or PFM. Please refer to [link to relevant documentation]. Figure 2 and Figure 8 In this embodiment, the over-snap logic unit includes a second timing unit 420, a second duration control unit 430, a third timing unit 440, and a third duration control unit 450. The input terminals of the second timing unit 420 and the third timing unit 440 are electrically connected to the output terminal of the over-snap comparison unit 410, respectively. The output terminal of the second timing unit 420 is electrically connected to the second duration control unit 430, and the output terminal of the second duration control unit 430 is electrically connected to the control terminal of the first switch unit 210 via the switch control unit 224. The output terminal of the third timing unit 440 is electrically connected to the third duration control unit 450, and the output terminal of the third duration control unit 450 is electrically connected to the second timing unit 420. In this embodiment, the second timing unit 420 is triggered by a first edge or a first level, the third timing unit 440 is triggered by a second edge or a second level, and the third timing unit 440 stops timing by the first edge or the first level. The third duration control unit 450 controls whether the second timing unit 420 stops timing.

[0162] Specifically, in this embodiment, when there is airflow, the airflow detection unit 221 is triggered, and the system control unit 220 drives the first switching unit 210 to work through the PWM signal or the PFM signal. In one cycle, the PWM signal or the 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 second-level over-suction protection unit 223 determines that the first detection voltage is greater than the first reference voltage Vref1 (taking the first switch unit 210 as the example). At this time, the over-suction comparison unit 410 outputs a first level signal, and the second timing unit 420 starts timing. The second timing unit 420 outputs the timing duration to the second duration control unit 430. When the turn-off period is reached, the second-level over-suction protection unit 223 determines that the first detection voltage is lower than the first reference voltage Vref1. At this time, the over-suction comparison unit 410 outputs a second level signal, and the third timing unit 440 starts timing. The third timing unit 440 outputs the timing duration to the third duration control unit 450. When the turn-on period of the next cycle is reached, the third timing unit 440 receives the first level signal output by the second-level over-suction protection unit 223 and triggers the stop timing. That is, the third timing unit 440 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 450 receives a duration from the third timing unit 440 that is greater than or equal to the third preset duration, it indicates that the first switching 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, but a signal that completely shuts off the first switching unit 210. At this time, there is no airflow. The third duration control unit 450 outputs a reset signal to the second timing unit 420. The second timing unit 420 stops timing and resets the timing duration to zero. When the third duration control unit 450 receives a duration from the third timing unit 440 that is less than the third preset duration, it indicates that the first switching 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 450 does not output a reset signal to the second timing unit 420, and the second timing unit 420 accumulates the timing. When the second duration control unit 430 learns that the duration of the second timing unit 420 is greater than or equal to the second preset duration, the second duration control unit 430 outputs a secondary over-inhalation protection signal to control the first switch unit 210 to remain open and stop working. When the first switch unit 210 is open, the heating branch is disconnected, and the first switch unit 210 remains stopped working. At this time, the heating element 250 will no longer heat up, and the first switch unit 210 will no longer generate heat. The temperature of the first switch unit 210 and its surroundings will no longer rise, which can prevent the first switch 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 in particular, prevent a fire.

[0163] In this embodiment, when the second duration control unit 430 determines that the timing duration of the second timing unit 420 is greater than or equal to the second preset duration, it indicates that there is an abnormality in the internal circuit of the electronic cigarette or an abnormality in the usage environment of the electronic cigarette. The second duration control unit 430 outputs a secondary over-inhalation protection signal to the switch control unit 224, and the switch control unit 224 controls the first switch unit 210 to remain off. The first switch unit 210 is locked off, entering the secondary over-inhalation protection. In this embodiment, the atomizing component 200 also includes an activation circuit, which is electrically connected to the secondary over-inhalation protection unit 223. The activation circuit is used to output an activation signal to restore the over-inhalation logic unit to a normal state. In the normal state, the over-inhalation logic unit outputs an on-conduction signal to the switch control unit 224 to unlock the state. When the electronic cigarette malfunction is resolved, the activation circuit can send an activation signal to the secondary over-inhalation protection unit 223 to activate the electronic cigarette, and the electronic cigarette can resume normal use. In this embodiment, the activation circuit includes, for example, an activation button. The activation signal is triggered by the activation button, or by a combination of the activation button and the duration. Those skilled in the art can configure it according to actual conditions.

[0164] 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 system control module 272 and the first-level over-extraction protection. In this embodiment, the ratio of the third preset duration to the second preset duration is, for example, less than 1:10.

[0165] 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 switch unit 210. For example, 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 440 will not trigger the start of timing, and the timing duration will always be 0. The third duration control unit 450 will not output a reset signal to the second timing unit 420 (the third duration control unit 450 only outputs a reset signal when the first switch unit 210 is not working). The second timing unit 420 will continue to accumulate the timing. When the second duration control unit 430 learns that the timing duration of the second timing unit 420 is greater than or equal to the second preset duration, the second duration control unit 430 will output a secondary over-suction protection signal to turn off the first switch unit 210.

[0166] 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 420 will keep timing. When the timing duration of the second timing unit 420 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 210 temperature from continuously rising due to the heat not being dissipated in time and the smoke being drawn again.

[0167] Please continue reading Figure 8In this embodiment, the second timing unit 420 includes a first reference frequency generating unit 422 and a second timing subunit 421, and the third timing unit 440 includes a third timing subunit 441. The second timing unit 420 and the third timing unit 440 share a first reference frequency generating unit 422, which can reduce costs. The second timing subunit 421 and the third timing subunit 441 are electrically connected to the output terminal of the over-extraction comparison unit 410, respectively. The second timing subunit 421 is electrically connected to the second duration control unit 430 and the first reference frequency generating unit 422, respectively. The third timing subunit 441 is electrically connected to the third duration control unit 450 and the first reference frequency generating unit 422, respectively. The third duration control unit 450 is electrically connected to the second timing subunit 421. In this embodiment, the first reference frequency generating unit 422 is always operational. When the first switching unit 210 is turned on, the second timing subunit 421 is triggered to receive the frequency signal output by the first reference frequency generating unit 422. The frequency signal may be, for example, a pulse signal, a sawtooth wave signal, or a triangular wave signal. The second timing subunit 421 begins timing. When the first switching unit 210 is turned off, the third timing subunit 441 is triggered to receive the frequency signal output by the first reference frequency generating unit 422. The third timing subunit 441 begins timing. When the first switching unit 210 is turned on again, the third timing subunit 441 begins timing. The timing subunit 441 stops receiving the frequency signal output by the first reference frequency generating unit 422, and the third timing subunit 441 stops timing and resets to zero. When the third duration control unit 450 receives a duration counted by the third timing subunit 441 that is greater than or equal to a third preset duration, the third duration control unit 450 outputs a reset signal to the second timing subunit 421, and the second timing subunit 421 resets to zero. When the third duration control unit 450 receives a duration counted by the third timing subunit 441 that is less than the third preset duration, the third timing subunit 441 does not output a reset signal. Alternatively, in other embodiments of this application, the second timing unit 420 and the third timing unit 440 may not share the first reference frequency generating unit 422, or each may have its own first reference frequency generating unit 422. In this embodiment, the second timing subunit 421 and the second duration control unit 430 can be implemented in one circuit module or separately. The third timing subunit 441 and the third duration control unit 450 can also be implemented in one circuit module or separately. The second timing subunit 421, the second duration control unit 430, the third timing subunit 441 and the third duration control unit 450 can also be implemented in one circuit module.

[0168] In this embodiment, the first reference frequency generating unit 422 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 420 includes a second reference frequency generating unit 442 and a second timing subunit 421, and the third timing unit 440 includes a third timing subunit 441. The second timing unit 420 and the third timing unit 440 share a second reference frequency generating unit 442, which reduces costs. The second reference frequency generating unit 442 and the third timing subunit 441 are electrically connected to the output terminal of the over-extraction comparison unit 410, respectively. The second timing subunit 421 and the third timing subunit 441 are electrically connected to the second reference frequency generating unit 442, respectively. The second timing subunit 421 is electrically connected to the second duration control unit 430, and the third timing subunit 441 is electrically connected to the third duration control unit 450. The third duration control unit 450 is electrically connected to both the second reference frequency generating unit 442 and the second timing subunit 421. In this embodiment, the second reference frequency generating unit 442 operates when the first switching unit 210 is working, and the second reference frequency generating unit 442 stops operating after a delay when the first switching unit 210 is not working, thus not generating a frequency signal. This setting can save energy.

[0169] Specifically, in this embodiment, when the first switch unit 210 is turned on, the over-sinking comparison unit 410 outputs a first-level signal, the second reference frequency generating unit 442 is triggered to output a frequency signal, and the second timing subunit 421 receives the frequency signal and starts timing. When the first switch unit 210 is turned off, the over-sinking comparison unit 410 outputs a second-level signal, the third timing subunit 441 is triggered to receive the frequency signal output by the second reference frequency generating unit 442, and the third timing subunit 441 starts timing. When the first switch unit 210 is turned on again, the over-sinking comparison unit 410 switches from outputting a second-level signal to outputting a first-level signal, and the third timing subunit 441 stops receiving the frequency signal from the second reference frequency generating unit 442. When the frequency signal output by the third timing subunit 441 is less than the third preset duration, the third duration control unit 450 stops timing and resets to zero. When the duration received by the third duration control unit 450 from the third timing subunit 441 is greater than or equal to the third preset duration, it indicates that the electronic cigarette is no longer working. The third duration control unit 450 outputs a reset signal to the second timing subunit 421 and the second reference frequency generating unit 442. The second reference frequency generating unit 442 stops working and stops generating frequency signals. At the same time, the second timing subunit 421 is reset to zero. When the duration received by the third duration control unit 450 from the third timing subunit 441 is less than the third preset duration, the third timing subunit 441 does not output a reset signal. In other embodiments of this application, the third duration control unit 450 may also be electrically connected to the second reference frequency generating unit 442, but not electrically connected to the second timing subunit 421. In this case, when the third duration control unit 450 receives a duration from the third timing subunit 441 that is greater than or equal to a third preset duration, it indicates that the electronic cigarette is no longer working. The third duration control unit 450 outputs a reset signal to the second reference frequency generating unit 442, and the second reference frequency generating unit 442 stops working and stops generating frequency signals. The second timing subunit 421 does not receive frequency signals and automatically resets to zero. Furthermore, in other embodiments of this application, the second timing unit 420 and the third timing unit 440 may not share the second reference frequency generating unit 442, or each may have its own second reference frequency generating unit 442. In this embodiment, the second timing subunit 421 and the second duration control unit 430 can be implemented in one circuit module or separately. The third timing subunit 441 and the third duration control unit 450 can also be implemented in one circuit module or separately. The second timing subunit 421, the second duration control unit 430, the third timing subunit 441 and the third duration control unit 450 can also be implemented in one circuit module.

[0170] In this embodiment, the second preset duration is adjustable. The method for adjusting the second preset duration has been described in the first embodiment and will not be repeated here. In this embodiment, the third preset duration is adjustable. The method for adjusting the third preset duration is the same as that for adjusting the second preset duration, and will not be repeated here. In one embodiment of this application, the ratio of the second preset duration to the third preset duration can be fixed. In other embodiments of this application, the third preset duration can also be non-adjustable.

[0171] In the first to fourth embodiments, the system control circuit implements a two-stage over-inhalation protection for the electronic cigarette, which can at least partially solve the following problems: The first switching unit 210 operates for a long time, or the first switching unit 210 stops operating for a very short time, resulting in insufficient heat dissipation and excessive temperature rise in the first switching unit 210. This causes the temperature inside the entire electronic cigarette to rise, leading to deterioration and damage to the first switching unit 210, as well as deterioration and damage to the surrounding circuitry, resulting in serious damage to the electronic cigarette. Furthermore, this embodiment uses the same first switching unit 210, eliminating the need for additional switching components and reducing costs. Moreover, it does not require changes to the original circuitry of the electronic cigarette; only minor modifications are needed to the system control module 272, resulting in good compatibility and low cost.

[0172] Fifth embodiment

[0173] In the first to fourth embodiments, the voltage between the atomizing end AT and the second detection resistor 271 is used to determine whether the first switching unit 210 is turned on. In this embodiment, the presence of a conducting current in the heating branch formed by the heating element 250 and the first switching unit 210 in series is used to determine whether the first switching unit 210 is turned on. For any parts not described in this embodiment, please refer to the first to fourth embodiments.

[0174] Please see Figure 2 In this embodiment, the first switching unit 210 is positioned on top, and the system control module 272 includes a branch detection unit. The branch detection unit 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 current detection unit and an atomizing terminal AT. The current detection unit is used to obtain a third detection voltage that is proportional to the current flowing through the heating branch. This third detection voltage is used to determine the second detection voltage. In this embodiment, the third detection voltage is the second detection voltage, and it is used to characterize whether there is current flowing in the heating branch.

[0175] Specifically, please refer to [see also] Figure 2 and Figure 10In this embodiment, the current detection unit includes a first detection MOSFET JM1, a first detection operational amplifier JOPA1, a second detection MOSFET JM2, and a third detection resistor JR3. The gate of the first detection MOSFET JM1 is electrically connected to the gate of the first switching unit 210, its source is electrically connected to the battery terminal BAT1, and its drain is electrically connected to the non-inverting terminal of the first detection operational amplifier JOPA1. The inverting terminal of the first detection operational amplifier JOPA1 is electrically connected to the atomizing terminal AT. The non-inverting terminal of the first detection operational amplifier JOPA1 is also electrically connected to the source of the second detection MOSFET JM2. The output terminal of the first detection operational amplifier JOPA1 is electrically connected to the gate of the second detection MOSFET JM2. The drain of the second detection MOSFET JM2 is electrically connected to one end of the third detection resistor JR3, and the other end of the third detection resistor JR3 is connected to the first ground terminal GND1. When the first switching unit 210 is turned on, the voltage at the drain of the second detection MOSFET JM2 is as follows:

[0176] Visen = Iload * JR3 / KI;

[0177] Wherein, Visen represents the third detection voltage, which is used to characterize the current flowing through the heating element 250; Iload represents the real-time current flowing through the heating element 250; KI:1 represents the width-to-length ratio of the first switching unit 210 (first MOS transistor) to the first detection MOS transistor JM1; JR3 represents the resistance value of the third detection resistor JR3, and the values ​​of JR3 and KI are known. In this embodiment, the first switching unit 210, the first detection MOS transistor JM1, and the second detection MOS transistor JM2 are all PMOS transistors. However, this application is not limited to this; in other embodiments of this application, they may all be NMOS transistors, etc.

[0178] In this embodiment, when the first switching unit 210 is turned on, the first detection MOSFET JM1 is also turned on. At this time, the current Iload flows through the first switching unit 210, and the current Iload / KI flows through the first detection MOSFET JM1. This current also flows through the third detection resistor JR3. The voltage Visen at the drain of the second detection MOSFET JM2 relative to the first ground terminal GND1 is as shown in the above formula. When the first switching unit 210 is turned off, the first detection MOSFET JM1 is also turned off. At this time, the voltage Visen at the drain of the second detection MOSFET JM2 is the voltage of the first ground terminal GND1, typically 0V or in the microvolt range. Therefore, the operation of the first switching unit 210 can be directly determined by detecting the magnitude of the voltage Visen.

[0179] In this embodiment, the system control unit 220 further includes a secondary over-absorption protection unit 223. The secondary over-absorption protection unit 223 includes an over-absorption comparator unit 410, which is generally a voltage comparator. One input terminal of the over-absorption comparator unit 410 is electrically connected to the drain of the second detection MOSFET JM2 to receive the detection voltage Visen. The other input terminal of the over-absorption comparator unit 410 is connected to a first reference voltage Vref1. The first reference voltage Vref1 is greater than the voltage of the battery terminal BAT1 when the first switching unit 210 is turned off, and less than the detection voltage when the first switching unit 210 is turned on. The range of the first reference voltage Vref1 is, for example, (0.5 / K)V-(3.2 / K)V.

[0180] In this embodiment, the secondary over-sucking protection unit 223 includes an over-sucking logic unit, which has been described in the first to fourth embodiments and will not be repeated here.

[0181] Additionally, in this embodiment, please continue to refer to... Figure 10 The branch detection unit also includes a voltage divider detection unit, and only one of the voltage divider detection unit and the current detection unit is required. In this embodiment, the voltage divider detection unit includes a fourth detection resistor JR4 and a fifth detection resistor JR5. One end of the fourth detection resistor JR4 is electrically connected to the atomizing end AT, and the other end of the fourth detection resistor JR4 is electrically connected to one end of the fifth detection resistor JR5. The other end of the fifth detection resistor JR5 is electrically connected to the first ground terminal GND1. The voltage divider voltage Vvsen at the connection point of the fourth detection resistor JR4 and the fifth detection resistor JR5 is as follows, and this voltage divider voltage can also be used to determine the second detection voltage. Here, this voltage divider voltage is the second detection voltage.

[0182] Vvsen=Vload*JR5 / (JR3+JR4);

[0183] Where Vvsen represents the voltage divider voltage, Vload is the voltage drop across the heating element 250, JR4 represents the resistance of the fourth sensing resistor JR4, and JR5 represents the resistance of the fifth sensing resistor JR5. Here, the voltage divider voltage Vvsen indirectly represents the voltage at the atomizing end AT. Therefore, the operation of the first switching unit 210 can be directly determined using the voltage divider voltage Vvsen.

[0184] Sixth Embodiment

[0185] Please see Figure 11 , Figure 11 This is a circuit block diagram of the system control circuit of the sixth embodiment of this application. This embodiment is similar to the fifth embodiment. Therefore, the parts not described in this embodiment can be referred to the fifth embodiment. The main difference between this embodiment and the fifth embodiment is that the first switch unit 210 is located at the bottom.

[0186] Please see Figure 5 and Figure 11 In this embodiment, the first switching unit 210 is located at the bottom, and the system control module 272 includes a branch detection unit. The branch detection unit 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 current detection unit and an atomizing terminal AT. The current detection unit is used to obtain a detection voltage proportional to the current flowing through the heating branch. This detection voltage is used to determine the second detection voltage. In this embodiment, the detection voltage is the second detection voltage, which is used to characterize whether there is current flowing in the heating branch.

[0187] Specifically, please refer to [see also] Figure 5 and Figure 11 In this embodiment, the current detection unit includes a first detection MOSFET JM1, a first detection operational amplifier JOPA1, a second detection MOSFET JM2, and a third detection resistor JR3. The gate of the first detection MOSFET JM1 is electrically connected to the gate of the first switching unit 210, its drain is electrically connected to the first ground terminal GND1, and its source is electrically connected to the inverting terminal of the first detection operational amplifier JOPA1. The non-inverting terminal of the first detection operational amplifier JOPA1 is electrically connected to the atomizing terminal AT. The inverting terminal of the first detection operational amplifier JOPA1 is also electrically connected to the drain of the second detection MOSFET JM2. The output terminal of the first detection operational amplifier JOPA1 is electrically connected to the gate of the second detection MOSFET JM2. The source of the second detection MOSFET JM2 is electrically connected to one end of the third detection resistor JR3, and the other end of the third detection resistor JR3 is connected to the battery terminal BAT1. When the first switching unit 210 is turned on, the voltage at the source of the second detection MOSFET JM2 is as follows:

[0188] Visen = Vbat - Iload * JR3 / KI;

[0189] Wherein, Visen represents the detection voltage, which characterizes the current flowing through the heating element 250; Vbat represents the battery terminal voltage BAT1; Iload represents the real-time current flowing through the heating element 250; KI:1 represents the width-to-length ratio of the first switching unit 210 (first MOS) to the first detection MOS transistor JM1; JR3 represents the resistance value of the third detection resistor JR3, and the values ​​of JR3 and KI are known. In this embodiment, the first switching unit 210, the first detection MOS transistor JM1, and the second detection MOS transistor JM2 are all PMOS transistors. However, this application is not limited to this; in other embodiments of this application, they may all be NMOS transistors, etc.

[0190] In this embodiment, when the first switching unit 210 is turned on, the first detection MOSFET JM1 is also turned on. At this time, the current Iload flows through the first switching unit 210, and the current Iload / KI flows through the first detection MOSFET JM1. This current also flows through the third detection resistor JR3. The voltage Visen at the source of the second detection MOSFET JM2 is relatively small, as shown in the above formula. When the first switching unit 210 is turned off, the first detection MOSFET JM1 is also turned off. At this time, the voltage Visen at the source of the second detection MOSFET JM2 is the voltage at the battery terminal BAT1, which is relatively large. Therefore, the operation of the first switching unit 210 can be directly determined by detecting the voltage Visen.

[0191] In this embodiment, the system control unit 220 further includes a secondary over-absorption protection unit 223. The secondary over-absorption protection unit 223 includes an over-absorption comparator unit 410, which is generally a voltage comparator. One input terminal of the over-absorption comparator unit 410 is electrically connected to the drain of the second detection MOSFET JM2 to receive the detection voltage Visen. The other input terminal of the over-absorption comparator unit 410 is connected to a second reference voltage Vref2. The second reference voltage Vref2 is less than the voltage of the battery terminal BAT1 when the first switching unit 210 is turned off, and the second reference voltage Vref2 is greater than the detection voltage when the first switching unit 210 is turned on.

[0192] In this embodiment, the secondary over-sucking protection unit 223 further includes an over-sucking logic unit, which has been described in the first to fourth embodiments and will not be repeated here.

[0193] Additionally, in this embodiment, please continue to refer to... Figure 11 The branch detection unit also includes a voltage divider detection unit, and only one of the voltage divider detection unit and the current detection unit may be present. In this embodiment, the voltage divider detection unit includes a fourth detection resistor JR4 and a fifth detection resistor JR5. One end of the fourth detection resistor JR4 is electrically connected to the battery terminal BAT1, and the other end of the fourth detection resistor JR4 is electrically connected to one end of the fifth detection resistor JR5. The other end of the fifth detection resistor JR5 is also electrically connected to the battery terminal BAT1. The voltage divider voltage at the connection point of the fourth detection resistor JR4 and the fifth detection resistor JR5 is as follows, and this voltage divider voltage can also be used to determine the second detection voltage. Here, this voltage divider voltage is the second detection voltage.

[0194] Vvsen=Vbat-Vload*JR5 / (JR4+JR5);

[0195] Where Vvsen represents the voltage divider voltage, Vload is the voltage drop across the heating element 250, JR4 represents the resistance of the fourth detection resistor JR4, and JR5 represents the resistance of the fifth detection resistor JR5. Here, the voltage divider voltage Vvsen indirectly represents the voltage at the atomizing end AT. Therefore, the operation of the first switching unit 210 can be directly determined through the voltage divider voltage Vvsen. In addition, the voltage divider detection unit and the current detection unit can also have other functions.

[0196] Seventh Embodiment

[0197] In the first to sixth embodiments, the first switching unit 210 is turned on by detecting the voltage at the atomizing end AT, the voltage at the second detection resistor 271, and the current flowing through the heating element 250. This embodiment differs from the previous embodiments in that it determines whether the first switching unit 210 is turned on by detecting the driving voltage of the first switching unit 210. Any parts not described in this embodiment can be found in the first to sixth embodiments.

[0198] 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 first ground terminal GND1. Therefore, the voltage that drives the first switching unit 210 to turn on or off is generally fixed and varies considerably.

[0199] To determine whether the first switching unit 210 is on or off, please refer to [link / reference]. Figure 12In this embodiment, the system control module 272 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 conductive. In this embodiment, the branch detection unit includes a control terminal of the first switching unit 210. In this embodiment, the system control unit 220 also includes a secondary over-suction protection unit 223, which is electrically connected to the control terminal of the first switching unit 210. The voltage at the control terminal of the first switching unit 210 is used to determine the second detection voltage. In this embodiment, the voltage at the control terminal of the first switching unit 210 is the second detection voltage. Specifically, the secondary over-absorption protection unit 223 includes an over-absorption comparator unit 410, which is, for example, a voltage comparator. One input terminal of the over-absorption comparator unit 410 is electrically connected to the control terminal of the first switching unit 210, and the other input terminal of the over-absorption comparator unit 410 is electrically connected to a third reference voltage generating unit. The third reference voltage generating unit generates a second reference voltage Vref2 and inputs it to the over-absorption comparator unit 410. In this embodiment, the second reference voltage Vref2 is generally between the turn-on voltage and the turn-off voltage of the first switching unit 210, for example, between 0.5V and 2V, such as 0.5V, 1V, 1.5V, 2V, etc. In this embodiment, when the first switching unit 210 is off, the voltage at the control terminal of the first switching unit 210 is greater than the second reference voltage Vref2, and the over-absorption comparator unit 410 outputs a second level signal. When the first switching unit 210 is on, the voltage at the control terminal of the first switching unit 210 is less than the second reference voltage Vref2, and the over-absorption comparator unit 410 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, another input terminal of the oversink comparator 410 is connected to a first reference voltage Vref1. The first reference voltage Vref1 is generally between the turn-on and turn-off voltages of the first switching unit 210, for example, between 0.5V and 2V, such as 0.5V, 1V, 1.5V, 2V, etc. In this case, when the first switching unit 210 is off, the voltage at the control terminal of the first switching unit 210 is less than the first reference voltage Vref1, and the oversink comparator 410 outputs a second level signal. When the first switching unit 210 is on, the voltage at the control terminal of the first switching unit 210 is greater than the first reference voltage Vref1, and the oversink comparator 410 outputs a first level signal.

[0200] In this embodiment, the secondary over-sucking protection unit 223 further includes an over-sucking logic unit, which has been described in the first to sixth embodiments and will not be repeated here.

[0201] In addition, in this embodiment, the first switch unit 210 is built-in, but this application is not limited to this. In other embodiments of this application, the first switch unit 210 can also be external. In this case, the branch detection unit includes a first switch control terminal (pin) GT. The first switch control terminal GT is electrically connected to the control terminal of the first switch unit 210, and one input terminal of the over-sucking comparison unit 410 is electrically connected to the first switch control terminal GT.

[0202] Eighth embodiment

[0203] In the first to seventh embodiments, secondary over-pull protection is achieved through the first switching unit 210. However, if the first switching unit 210 itself is short-circuited and damaged, or if the switching control unit 224 is damaged, although the system control unit 220 is equipped with a secondary over-pull protection unit 223, the first switching unit 210 or the switching control unit 224 will be uncontrolled. To completely solve this problem, this embodiment uses the second switching unit 140 to achieve secondary over-pull protection. This eliminates the need for additional switching units and reduces costs. Parts not described in this embodiment can be found in the first to seventh embodiments and will not be repeated here.

[0204] Please see Figure 13a and Figure 13b In this embodiment, the system control unit 220 further includes a secondary over-suction protection unit 223. The function and role of the secondary over-suction protection unit 223 have been described in previous embodiments and will not be repeated here. In this embodiment, the system control module 272 further includes an over-suction control terminal SC, which is electrically connected to the secondary over-suction protection unit 223. The battery protection module 130 includes an over-suction receiver SR, which is electrically connected to the over-suction control terminal SC and to the logic control unit 150 or the over-discharge voltage protection unit. When the second duration control unit 430 of the secondary over-suction protection unit 223 determines that the timing duration of the second timing unit 420 is greater than or equal to the second preset duration, the over-suction logic unit outputs a sleep signal or an over-discharge signal through the over-suction control terminal SC. After the over-suction receiver SR receives the sleep signal or the over-discharge signal, the logic control unit 150 controls the battery protection circuit 120 to enter a sleep mode. In the sleep mode, the second switch unit 140 remains closed. The sleep signal or the over-discharge signal is a pre-programmed encoded signal between the over-suction logic unit and the battery protection module 130.

[0205] In this embodiment, when the logic control unit 150 is electrically connected to the over-suction receiver SR, the logic control unit 150 includes a logic gate circuit. One input of the logic gate circuit is electrically connected to the input of the over-discharge voltage protection unit, and the other input of the logic gate circuit is electrically connected to the over-suction receiver SR. When either the over-discharge voltage protection unit or the over-suction receiver SR receives a sleep signal or a shutdown signal, the logic control unit 150 controls the battery protection circuit 120 to enter a sleep mode. In the sleep mode, the second switch unit 140 remains off, and at least some units of the battery protection module 130 do not consume power or the entire module does not consume power. When the over-discharge voltage protection unit is electrically connected to the over-suction receiver SR, when the over-suction receiver SR receives an over-discharge signal, the over-discharge voltage protection unit outputs a sleep signal to the logic control unit 150. The logic control unit 150 controls the battery protection circuit 120 to enter a sleep mode. In the sleep mode, the second switch unit 140 remains off, and at least some units of the battery protection module 130 do not consume power or the entire module does not consume power. As for how the logic control unit 150 enters sleep mode after receiving a sleep signal, this is a conventional technique in the field and will not be described in detail here.

[0206] When the second switch unit 140 is disconnected, the main discharge circuit is broken. Even if the first switch unit 210 remains open or short-circuited, the battery 110 will not supply power to the system control circuit. The first switch unit 210 remains inactive. At this time, the heating element 250 will no longer heat up, and the first switch unit 210 will no longer generate heat. The temperature of the first switch unit 210 and its surroundings will not rise further, preventing damage to the first switch unit 210 or the system control module 272 due to high temperatures, which could exacerbate damage to the electronic cigarette and, in particular, prevent a fire. Moreover, this embodiment only requires minor modifications to the battery protection circuit 120 and the system control module 272, resulting in good compatibility.

[0207] 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 terminal VM of the battery protection circuit 120 can be pulled low (second switching unit 140 lowered) or pulled high (second switching unit 140 uppered) to reactivate the battery protection module 130, and the second switching unit 140 will remain on. In this embodiment, the system terminal VM can be pulled low or pulled high by connecting a charger. In this embodiment, a charging detection unit is also provided between the logic control unit 150 and the system terminal VM. When the charging detection unit detects a charging signal, the battery protection circuit 120 can exit the sleep mode, and the second switching unit 140 will resume conduction.

[0208] Ninth Embodiment

[0209] Figure 14This is a schematic diagram of the ninth embodiment of this application. This embodiment is similar to the eighth embodiment, but the main difference is that it does not require the addition of an over-absorbing receiver (SR). Parts not described in this embodiment can be found in the eighth embodiment and will not be repeated here.

[0210] Please see Figure 14 In this embodiment, the system control unit 220 further includes a secondary over-suction protection unit 223. The function and role of the secondary over-suction protection unit 223 have been described in the previous embodiments and will not be repeated here. In this embodiment, the system control module 272 further includes an over-suction control terminal SC and a fourth switching unit 280. The system control circuit further includes an over-discharge resistor R3. The fourth switching unit 280, the over-discharge resistor R3, and the over-suction control terminal SC are connected in series to form an over-discharge series circuit. One end of the over-discharge series circuit is connected to the first ground terminal GND1, and the other end of the over-discharge series circuit is electrically connected to the power supply terminal. In one implementation, one end of the fourth switching unit 280 is electrically connected to the first ground terminal GND1, and the other end of the fourth switching unit 280 is electrically connected to the over-suction control terminal SC. The over-suction control terminal SC is electrically connected to one end of the over-discharge resistor R3, and the other end of the over-discharge resistor R3 is electrically connected to the power supply terminal (the over-discharge resistor R3 is external). The power supply terminal is electrically connected to the positive terminal of the battery 110 via a first resistor. The control terminal of the fourth switching unit 280 is electrically connected to the over-suction logic unit. In another implementation, one end of the fourth switching unit 280 is electrically connected to the third ground terminal, and the other end of the fourth switching unit 280 is electrically connected to one end of the over-discharge resistor R3. The other end of the over-discharge resistor R3 is electrically connected to the over-sucking control terminal SC (the over-discharge resistor R3 is built-in). The over-sucking control terminal SC is electrically connected to the power supply terminal, which is electrically connected to the positive terminal of the battery 110 via the first resistor. The control terminal of the fourth switching unit 280 is electrically connected to the over-sucking logic unit. Furthermore, the positions of the fourth switching unit 280 and the over-discharge resistor R3 can be interchanged. In this embodiment, the resistance value of the over-discharge resistor R3 is generally less than 2:1 compared to the resistance value of the first resistor, preferably 1:1.

[0211] In this embodiment, when the second duration control unit 430 of the over-absorption logic unit determines that the timing duration of the second timing unit 420 is greater than or equal to the second preset duration, the over-absorption logic unit controls the fourth switch unit 280 to turn on, and the voltage at the power supply terminal is pulled down to below the preset over-discharge threshold voltage, thereby the over-discharge voltage protection unit of the battery protection module 130 takes effect, causing the battery protection module 130 to enter the sleep mode. In the sleep mode, the second switch unit 140 remains off, and the battery 110 will not supply power to the heating branch, and the first switch unit 210 remains stopped working.

[0212] Generally speaking, in a conventional battery protection circuit 120, when the battery 110 is deeply discharged, the conventional battery protection circuit 120 detects the deep discharge of the battery 110 through an over-discharge voltage protection unit. Specifically, it determines whether the battery 110 is deeply discharged by detecting whether the voltage at the power supply terminal is lower than a preset over-discharge threshold voltage. If it is lower than the preset over-discharge threshold voltage, the over-discharge voltage protection unit determines that the battery 110 is in a deep discharge state and sends a sleep signal to the logic control unit 150. The logic control unit 150 controls the battery protection circuit 120 to enter a sleep mode. In the sleep mode, the second switch unit 140 is disconnected, and the battery protection circuit 120 stops consuming power to protect the battery 110 and prevent the battery 110 from being damaged due to over-discharge. The battery protection circuit 120 resumes power supply after the charging detection unit detects a charging signal, and the second switch unit 140 is turned on to restore power supply to the atomizing component 200. In one embodiment of this application, the existing circuit and function of the over-discharge voltage protection unit in the prior art are fully utilized to control the second switch unit 140 to disconnect and control the battery protection circuit 120 to stop consuming power. Specifically, one end of the over-discharge series circuit is electrically connected to the power supply terminal. When the fourth switch unit 280 is turned off, the over-suction control terminal SC is in a high-impedance state. Under normal conditions, the fourth switch unit 280 is open, and the over-suction control terminal SC is in a high-impedance state. When the second duration control unit 430 controls the fourth switch unit 280 to turn on, the over-discharge series circuit consisting of the power supply terminal, the over-discharge resistor R3, and the fourth switch unit 280 is turned on. As a result, the over-discharge resistor R3 and the first resistor divide the voltage of the battery 110, thereby reducing the voltage signal received at the power supply terminal. In this embodiment, the voltage is reduced to less than 2 / 3 of the battery 110 voltage. Generally, a battery 110 voltage of less than 2 / 3 will be lower than the preset over-discharge threshold voltage set for deep discharge. Generally speaking, the range of the battery 110 supply voltage is 2.8V-4.2V, and the preset over-discharge threshold voltage for deep discharge is generally 2.8V. The range of the battery 110 voltage of less than 2 / 3 is less than 2.8V, which is lower than the preset over-discharge threshold voltage for deep discharge. Therefore, when the fourth switching unit 280 is turned on, the over-discharge voltage protection unit detects that the voltage at the power supply terminal is lower than the preset over-discharge threshold voltage. At this time, the over-discharge voltage protection unit outputs a sleep signal to the logic control unit 150, and the logic control unit 150 controls the battery protection circuit 120 to enter sleep mode. In sleep mode, the second switching unit 140 remains off, and the battery protection module 130 is controlled to stop consuming power. In this embodiment, the fourth switching unit 280 is an NMOS transistor. However, this application is not limited to this; in other embodiments of this application, the fourth switching unit 280 can also be a PMOS transistor, etc. In this embodiment, the battery protection circuit 120 does not need to be modified, has good compatibility, and is low in cost.

[0213] Generally speaking, the battery protection module 130 has two protection modes for deep discharge: over-discharge recoverable mode and over-discharge non-recoverable mode. Users or manufacturers can set these modes as needed. When the battery protection circuit 120 is in over-discharge recoverable mode, if the over-discharge voltage protection unit detects that the voltage at the power supply terminal is lower than the preset over-discharge threshold voltage (e.g., false detection), the second switch unit 140 is disconnected. When the voltage at the power supply terminal increases to above the preset over-discharge threshold voltage, the battery protection circuit 120 automatically exits the sleep mode, and the second switch unit 140 is turned on. Therefore, in this mode, the fourth switch unit 280 needs to be protected. The battery protection module 130 remains continuously on when it is in the over-discharge unrecoverable mode. When the over-discharge voltage protection unit detects that the voltage at the power supply terminal is lower than the preset over-discharge threshold voltage, the second switch unit 140 is disconnected, and the battery protection module 130 does not consume power. In this mode, even if the voltage at the power supply terminal increases to above the preset over-discharge threshold voltage, the battery protection circuit 120 is still in the sleep mode. In this mode, the fourth switch unit 280 does not need to remain continuously on. In this case, the battery protection module 130 exits the sleep mode only when a charging signal is detected. In this embodiment, it is preferably in the over-discharge unrecoverable mode.

[0214] In this embodiment, the over-discharge resistor R3 is located outside the system control module 272, which is located on the chip. However, this application is not limited to this; in other embodiments of this application, the over-discharge resistor R3 and the system control module 272 may be located on the same chip.

[0215] 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.

[0216] 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.

[0217] 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 system control circuit for use in electronic cigarettes, characterized in that, The system includes a system control module and a first switching unit. The system control module includes a battery terminal, a first ground terminal, and a system control unit. The battery terminal and the first ground terminal are electrically connected to the two ends of the battery assembly, respectively. The system control unit includes a switch control unit, which is electrically connected to the control terminal of the first switching unit. The control terminal of the first switching unit is electrically connected to the system control unit. The first switching unit is connected in series with a heating element to form at least a partial heating branch. The system control module further 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. The system control unit includes a secondary over-suction protection unit, which is electrically connected to the branch detection unit. When the secondary over-suction protection unit determines that the heating branch is conducting based on the second detection voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to a second preset duration, the secondary over-suction protection unit is used to control the first switching unit to remain stopped. The secondary over-suction protection unit includes an over-suction comparison unit and an over-suction logic unit. One input terminal of the over-suction comparison unit is connected to a second detection voltage, and the other input terminal of the over-suction comparison unit is connected to a preset first reference voltage or a preset second reference voltage. The output terminal of the over-suction comparison unit is electrically connected to the over-suction logic unit, and the over-suction logic unit is used to be electrically connected to the switch control unit or the battery protection circuit of the battery assembly. The over-sucking 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 over-sucking comparison unit. 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. When the over-sucking comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the second timing unit starts timing. When the over-sucking comparison unit determines that the second detection voltage is less than the first reference voltage or greater than the second reference voltage, the third timing unit starts timing. When the over-sucking comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second 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 a 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 a second preset duration, the secondary over-sucking protection unit is used to control the first switching unit to remain stopped.

2. The system control circuit according to claim 1, characterized in that, The branch detection unit includes an atomizing end, which is used to electrically connect to the first switching unit and the heating element respectively, and the second detection voltage is determined based on the voltage of the atomizing end.

3. The system control circuit according to claim 2, characterized in that, The second detection voltage is the voltage at the atomizing end. When the secondary over-suction protection unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to the second preset duration, the secondary over-suction protection unit is used to control the first switching unit to remain stopped.

4. The system control circuit according to claim 2, characterized in that, The branch detection unit further includes a current detection unit, which is electrically connected to the atomizing end. The current detection unit is used to obtain a third detection voltage that is proportional to the current flowing through the heating branch. The second detection voltage is determined based on the third detection voltage.

5. The system control circuit according to claim 4, characterized in that, One end of the first switching unit is electrically connected to the battery terminal, and the other end of the first switching unit is electrically connected to the atomizing terminal; the second detection voltage is the third detection voltage. The current detection unit includes a first detection MOSFET, a first detection operational amplifier, a second detection MOSFET, and a third detection resistor. The gate of the first detection MOSFET is electrically connected to the gate of the first switching unit, its source is electrically connected to the battery terminal, its drain is electrically connected to the non-inverting terminal of the first detection operational amplifier, the inverting terminal of the first detection operational amplifier is electrically connected to the atomizing terminal, the non-inverting terminal of the first detection operational amplifier is also electrically connected to the source of the second detection MOSFET, the output terminal of the first detection operational amplifier is electrically connected to the gate of the second detection MOSFET, the drain of the second detection MOSFET is electrically connected to one end of the third detection resistor, and the other end of the third detection resistor is connected to the first ground terminal. The third detection voltage is the voltage at the drain of the second detection MOSFET; or... One end of the first switching unit is electrically connected to the first ground terminal, and the other end of the first switching unit is electrically connected to the atomizing terminal; the second detection voltage is the third detection voltage. The current detection unit includes a first detection MOS transistor, a first detection operational amplifier, a second detection MOS transistor, and a third detection resistor. The gate of the first detection MOS transistor is electrically connected to the gate of the first switching unit, its drain is electrically connected to the first ground terminal, its source is electrically connected to the inverting terminal of the first detection operational amplifier, the non-inverting terminal of the first detection operational amplifier is electrically connected to the atomizing terminal, the inverting terminal of the first detection operational amplifier is also electrically connected to the drain of the second detection MOS transistor, the output terminal of the first detection operational amplifier is electrically connected to the gate of the second detection MOS transistor, the source of the second detection MOS transistor is electrically connected to one end of the third detection resistor, and the other end of the third detection resistor is connected to the battery terminal. The third detection voltage is the voltage at the source of the second detection MOS transistor.

6. The system control circuit according to claim 2, characterized in that, The branch detection unit further includes a voltage divider detection unit, which is electrically connected to the atomizing end. The voltage divider detection unit is used to obtain a voltage divider voltage that is proportional to the voltage drop of the heating element. The second detection voltage is determined based on the voltage divider voltage.

7. The system control circuit according to claim 6, characterized in that, One end of the first switching unit is electrically connected to the battery terminal, and the other end of the first switching unit is electrically connected to the atomizing terminal; the second detection voltage is equal to the voltage divider voltage, the voltage divider detection unit includes a fourth detection resistor and a fifth detection resistor, one end of the fourth detection resistor is electrically connected to the atomizing terminal, the other end of the fourth detection resistor is electrically connected to one end of the fifth detection resistor, and the other end of the fifth detection resistor is electrically connected to the first ground terminal; the voltage divider voltage is the voltage at the connection point of the fourth and fifth detection resistors; or... One end of the first switching unit is electrically connected to the first ground terminal, and the other end of the first switching unit is electrically connected to the atomizing terminal; the second detection voltage is equal to the voltage divider voltage, and the voltage divider detection unit includes a fourth detection resistor and a fifth detection resistor. One end of the fourth detection resistor is electrically connected to the battery terminal, and the other end of the fourth detection resistor is electrically connected to one end of the fifth detection resistor. The other end of the fifth detection resistor is electrically connected to the atomizing terminal, and the voltage divider voltage is the voltage at the connection point of the fourth and fifth detection resistors.

8. The system control circuit according to claim 1, characterized in that, The branch detection unit includes the control terminal of the first switching unit, and the second detection voltage is determined based on the voltage of the control terminal of the first switching unit.

9. The system control circuit according to claim 8, characterized in that, The second detection voltage is the voltage at the control terminal of the first switching unit. When the secondary over-suction protection unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to the second preset duration, the secondary over-suction protection unit is used to control the first switching unit to remain stopped.

10. The system control circuit according to claim 1, characterized in that, The heating branch includes a first switching unit, a heating element, and a second detection resistor connected in series. The branch detection unit includes a heating detection terminal, which is used to electrically connect to a detection connection point. The detection connection point is either the connection point of the first switching unit and the second detection resistor or the connection point of the heating element and the second detection resistor. The second detection voltage is determined based on the voltage of the heating detection terminal.

11. The system control circuit according to claim 10, characterized in that, The second detection voltage is the voltage of the heating detection terminal. When the secondary over-suction protection unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to the second preset duration, the secondary over-suction protection unit is used to control the first switching unit to remain stopped.

12. The system control circuit according to any one of claims 1-11, characterized in that, The secondary over-suction protection unit is electrically connected to the switch control unit. When the secondary over-suction protection unit determines that the heating branch is conducting based on the second detection voltage, the secondary over-suction protection unit starts timing. When the timing duration of the secondary over-suction protection unit is greater than or equal to the second preset duration, the secondary over-suction protection unit controls the first switch unit to remain off through the switch control unit so that the first switch unit remains stopped working.

13. The system control circuit according to any one of claims 1-11, characterized in that, The second timing unit includes a first reference frequency generating unit 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 over-absorption comparison unit, the second duration control unit, and the first reference frequency generating unit, respectively; the third timing subunit is electrically connected to the over-absorption comparison unit, the third duration control unit, and the first reference frequency generating unit, respectively; the third duration control unit is electrically connected to the second timing subunit; when the over-absorption comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the second timing subunit starts timing; when the over-absorption comparison unit determines that the second detection voltage is less than the first reference voltage or greater than the second reference voltage, the third timing subunit starts timing; when the over-absorption comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second 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 a 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 generating unit and a second timing subunit, and the third timing unit includes a third timing subunit; wherein, the second reference frequency generating unit is electrically connected to the over-absorption comparison unit, the second timing subunit is electrically connected to the second duration control unit and the second reference frequency generating unit respectively, the third timing subunit is electrically connected to the over-absorption comparison unit, the third duration control unit and the second reference frequency generating unit respectively, and the third duration control unit is electrically connected to the second timing subunit and the second reference frequency generating unit respectively, and when the over-absorption comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second reference voltage, the... The second reference frequency generating unit starts working, and the second timing subunit starts timing. When the over-sucking comparison unit determines that the second detection voltage is less than the first reference voltage or greater than the second reference voltage, the third timing subunit starts timing. When the over-sucking comparison unit determines that the second detection voltage is greater than the first reference voltage or less than the second 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 generating unit to set the timing duration of the second timing unit to zero and to stop the second reference frequency generating unit from working; or... The third preset duration is less than one-tenth of the second preset duration.

14. The system control circuit according to any one of claims 1-11, characterized in that, The second preset duration is adjustable.

15. The system control circuit according to claim 14, characterized in that, The secondary over-absorption protection unit 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 terminal. A first terminal of the first current source is electrically connected to the battery terminal. 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 terminal. 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. A second terminal of the frequency switching unit is electrically connected to a first ground terminal. The frequency capacitor terminal is used to connect to the frequency capacitor. The second preset duration is proportional to the capacitance value of the frequency capacitor. Alternatively... The oversinking logic unit includes a first reference frequency generating unit or a second reference frequency generating unit; wherein the first reference frequency generating unit or the 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 terminal; the first current source includes a first frequency MOSFET, and the second current source includes a second frequency MOSFET; wherein the source of the first frequency MOSFET and the source of the second frequency MOSFET are both electrically connected to the battery terminal, and the gates of the first frequency MOSFET and the second frequency MOSFET are electrically connected and jointly connected to the output terminal of the frequency operational amplifier; one input terminal of the frequency operational amplifier is connected to a pre-amplifier. A second frequency reference voltage is set. Another 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 terminal. 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 the 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 first ground terminal. The frequency resistor terminal 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.

16. The system control circuit according to any one of claims 1-11, characterized in that, The system control module and the first switching unit are located on the same chip, the battery terminal is the battery pin, and the first ground terminal is the first ground pin; or... The system control module is located on the third chip, the first switch unit is located outside the third chip, the battery terminal is the battery pin, the first ground terminal is the first ground pin, and the system control module also includes a first switch control pin, which is electrically connected to the control terminal of the first switch unit.

17. An electronic cigarette, characterized in that, include: A battery assembly, which includes a battery; The atomizing assembly includes a system control circuit as described in any one of claims 1-16, and the atomizing assembly further includes a heating element. The battery terminal and the first ground terminal of the system control circuit are electrically connected to the two ends of the battery assembly. The first switching unit of the system control circuit is connected in series with the heating element to form at least a partial heating branch. The heating branch is connected in parallel with the system control module to form a parallel circuit. The battery, the heating branch, and the system control module are connected to form at least a partial discharge main circuit, and the battery assembly is electrically connected to the parallel circuit.

18. The electronic cigarette according to claim 17, characterized in that, The system control module includes an airflow detection terminal for electrical connection with an airflow detection element. The system control unit includes an airflow detection unit, a first timing unit, and a first duration control unit. The airflow detection unit is electrically connected to the airflow detection terminal, the first timing unit, and the switch control unit. The first duration control unit is electrically connected to the switch control unit and the first timing unit. When the airflow detection unit detects airflow through the airflow detection element, the first timing unit starts timing, and the switch control unit drives the first switch unit to work. When the airflow detection unit does not detect airflow through the airflow detection element, the first timing unit stops timing and sets the time to zero, and the switch control unit stops driving the first switch 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 first duration control unit stops driving the first switch unit through the switch control unit to stop it from working, and the first preset duration is less than a second preset duration.

19. The electronic cigarette according to claim 18, characterized in that, The airflow detection unit is electrically connected to the first timing unit, and the airflow detection unit triggers the first timing unit to reset to zero via an edge.

20. The electronic cigarette according to claim 18, 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.

21. The electronic cigarette according to any one of claims 17-20, characterized in that, The switch control unit drives the first switch unit to work via PWM or PFM, or the switch control unit drives the first switch unit to work via a normally-on conduction mode.

22. The electronic cigarette according to claim 17, characterized in that, The battery assembly also includes a battery protection circuit, which includes a second switching unit and a battery protection module. The battery protection module includes a power supply terminal, a second ground terminal, 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 terminal and the second ground terminal 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 and the discharge overcurrent protection unit. The control terminal of the second switching unit is electrically connected to the logic control unit. The second switching unit is used to control whether the battery supplies power to the atomizing component. The battery, the second switching unit, and the parallel circuit are connected in series to form the discharge main circuit. The battery protection module includes an over-suction receiver, and the system control module includes an over-suction control terminal. The over-suction control terminal is electrically connected to the secondary over-suction protection unit, and the over-suction receiver is electrically connected to the over-suction control terminal. The over-suction receiver is also electrically connected to the logic control unit or the over-discharge voltage protection unit. When the timing of the secondary over-suction protection unit is greater than or equal to a second preset duration, the secondary over-suction protection unit outputs a sleep signal to the logic control unit or outputs an over-discharge signal to the over-discharge voltage protection unit. The logic control unit controls the battery protection circuit to enter a sleep mode. In the sleep mode, the second switching unit remains open to keep the discharge main circuit open and the first switching unit remains stopped working.

23. The electronic cigarette according to claim 17, characterized in that, The battery assembly also includes a battery protection circuit, which includes a second switching unit and a battery protection module. The battery protection module includes a power supply terminal, a second ground terminal, 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 terminal and the second ground terminal 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 and the discharge overcurrent protection unit. The control terminal of the second switching unit is electrically connected to the logic control unit. The second switching unit is used to control whether the battery supplies power to the atomizing assembly. The system control module includes an over-suction control terminal and a fourth switching unit. The system control circuit also includes an over-discharge resistor. The fourth switching unit, the over-discharge resistor, and the over-suction control terminal are connected in series to form an over-discharge series circuit. The control terminal of the fourth switching unit is electrically connected to the secondary over-suction protection unit. One end of the over-discharge series circuit is connected to the first ground terminal, and the other end of the over-discharge series circuit is electrically connected to the power supply terminal. The battery assembly also includes a first resistor. The power supply terminal is electrically connected to the positive terminal of the battery through the first resistor. When the timing of the secondary over-suction protection unit is greater than or equal to a second preset duration, the secondary over-suction protection unit controls the fourth switching unit to turn on. The over-discharge voltage protection unit outputs a sleep signal to the logic control unit. The logic control unit controls the battery protection circuit to enter sleep mode. In sleep mode, the second switching unit remains open.

24. The electronic cigarette according to claim 23, characterized in that, The resistance ratio of the over-discharge resistor to the first resistor is less than 2:

1.

25. The electronic cigarette according to any one of claims 22-24, characterized in that, 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.

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