An electronic cigarette driving chip with adjustable state and electronic cigarette

Abstract

The present invention discloses an electronic cigarette driver chip with adjustable state, including a logic function circuit, the electronic cigarette driver chip with adjustable state also includes a one-time programmable storage circuit connected to the logic function circuit, the one-time programmable storage circuit includes: a voltage output circuit, one end of which is connected to a power supply; a polysilicon fuse, which is connected in series between the power supply and the voltage output circuit; a fuse control field effect transistor, the gate of which is connected to the logic function circuit, the drain is connected to the connection between the polysilicon fuse and the voltage output circuit, and the source is grounded. The present invention also discloses an electronic cigarette having the above-mentioned electronic cigarette driver chip with adjustable state. The present invention can be used for electronic cigarettes.

Description

Technical Field

[0001] The invention relates to an electronic cigarette, more specifically to an electronic cigarette driving chip. Background Art

[0002] An electronic cigarette usually includes a body, an electronic cigarette microphone disposed inside the body, and an electronic cigarette driver chip. The electronic cigarette driver chip usually has various control circuits built in, such as an overcurrent protection circuit, an LED control circuit, a temperature control circuit, etc. The existing electronic cigarette driver chip usually uses field effect transistors as switch elements to control various control circuits. Although this control method can also debug the working state required by the user, the debugged working state is relatively easy to be modified, and the user experience is poor. Summary of the invention

[0003] In order to solve the technical problem in the prior art that the working state of an electronic cigarette after debugging is relatively easy to be modified and the user experience is poor, the present invention provides an electronic cigarette driving chip with an adjustable state and an electronic cigarette.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is to design an electronic cigarette driver chip with adjustable state, including a logic function circuit, and the electronic cigarette driver chip with adjustable state also includes a one-time programmable storage circuit connected to the logic function circuit, and the one-time programmable storage circuit includes:

[0005] A voltage output circuit, one end of which is connected to a power supply;

[0006] a polysilicon fuse connected in series between the power supply and the voltage output circuit;

[0007] The fuse control field effect transistor has a gate connected to the logic function circuit, a drain connected to the connection between the polysilicon fuse and the voltage output circuit, and a source connected to the ground.

[0008] The voltage output circuit comprises: a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth field effect transistor, a sixth field effect transistor, a seventh field effect transistor, a first resistor, a second resistor, a third resistor and a fourth resistor;

[0009] The polysilicon fuse includes a first polysilicon fuse and a second polysilicon fuse;

[0010] The fuse control field effect transistor includes a first fuse control field effect transistor and a second fuse control field effect transistor;

[0011] The seventh field effect transistor is connected between the first polysilicon fuse and the second polysilicon fuse and the power supply, the gate of the seventh field effect transistor is connected to the fourth resistor, the gates of the first field effect transistor and the second field effect transistor are connected together, the drains of the first field effect transistor and the second field effect transistor are connected to the drains of the third field effect transistor and the fourth field effect transistor respectively, the gates of the third field effect transistor and the fourth field effect transistor are connected together, and the drains are connected together; the gates of the fifth field effect transistor and the sixth field effect transistor are connected to the drains of the first field effect transistor and the second field effect transistor respectively, the first resistor is connected in parallel between the drain and the source of the fifth field effect transistor, and the second resistor and the third resistor are connected in parallel between the drain and the source of the sixth field effect transistor;

[0012] The drains of the first fuse control field effect transistor and the second fuse control field effect transistor are connected to the first polysilicon fuse and the second polysilicon fuse respectively, the sources are grounded, and the gates are connected to the logic function circuit.

[0013] The electronic cigarette driving chip includes:

[0014] The airflow sensing circuit is used to detect the change of the microphone capacitance value and output a sensing signal;

[0015] an oscillator connected to the logic function circuit and used to generate an oscillation signal;

[0016] A logic function circuit is connected to the airflow sensing circuit and the oscillator. The logic function circuit calculates the frequency of the sensing signal according to the oscillation signal and outputs an atomization signal when the frequency of the sensing signal is within a set frequency range.

[0017] The electronic cigarette driving chip also includes a sensing signal amplifying circuit, which is connected in series between the airflow sensor circuit and the logic function circuit, amplifies the sensing signal and converts the sensing signal into a square wave signal and outputs it to the logic function circuit.

[0018] The electronic cigarette driver chip further includes a temperature control circuit connected to the logic function circuit and used for controlling the temperature of the driver chip.

[0019] The electronic cigarette driving chip also includes an overcurrent protection circuit connected to the logic function circuit and used for entering a standby mode when the output voltage exceeds a preset voltage.

[0020] The electronic cigarette driving chip also includes a charging circuit connected to the logic function circuit.

[0021] The driving chip also includes an LED control circuit connected to the logic function circuit and controlling the LED to turn on, off or flash according to the working state of the electronic cigarette.

[0022] The present invention also provides an electronic cigarette, which includes the above-mentioned electronic cigarette driving chip with adjustable state.

[0023] The electronic cigarette also includes:

[0024] ontology;

[0025] A human infrared sensor is disposed on the main body and sends a wake-up signal after detecting a human body;

[0026] The logic function circuit is connected to the human infrared sensor. The logic function circuit is in a standby state under normal conditions and returns to a normal working state after receiving the wake-up signal.

[0027] The present invention arranges polysilicon fuses and fuse control field effect transistors, and controls the on and off of the fuse control field effect transistors through a logic function control circuit to realize the on and off of the corresponding polysilicon fuses, thereby adjusting the voltage output circuit. Since some polysilicon fuses are blown, they are not easily modified again after being adjusted to the state required by the user, and the user experience is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0029] Figure 1 It is a schematic diagram of the present invention;

[0030] Figure 2 It is a schematic diagram of a one-time programmable storage circuit of the present invention;

[0031] Figure 3 It is a circuit diagram of a one-time programmable storage circuit of the present invention;

[0032] Figure 4 It is a structural diagram of the electronic cigarette of the present invention. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings:

[0034] See also Figures 1 to 3 The electronic cigarette driving circuit of the present invention comprises an electronic cigarette driving chip 1 with an adjustable state and a driving MOS tube 2 located outside the electronic cigarette driving chip and connected to the electronic cigarette driving chip. By placing the driving MOS tube outside the electronic cigarette driving chip, the structure of the existing electronic cigarette driving chip in which the driving MOS tube is built-in is changed, and the driving capacity can be determined according to actual needs, with stronger driving capacity and better adaptability.

[0035] In order to facilitate the control of the output voltage, the electronic cigarette driving circuit also includes a feedback circuit 3 connected to the driving MOS tube, and the electronic cigarette driving chip 1 includes a logic function circuit 11 and a PWM circuit 12 connected to the logic function circuit. The input end of the PWM circuit is connected to the output end of the feedback circuit 3, and the output end of the PWM circuit is connected to the driving MOS tube 2.

[0036] The voltage output by the driving MOS tube will be converted into a digital signal and then compared with the preset voltage value. When the voltage exceeds the preset voltage value, it is fed back to the logic function circuit through the feedback circuit. The logic function circuit reduces the duty cycle of the PWM circuit, thereby controlling and reducing the output voltage of the driving MOS tube. When the voltage is lower than the preset voltage value, the duty cycle of the PWM circuit is increased; when the voltage reaches the preset voltage value, the driving MOS tube is separated from the control of the PWM circuit.

[0037] In order to prevent the electronic cigarette from being started by mistake under the influence of environmental factors, the electronic cigarette driving chip also includes an airflow sensing circuit 13 and an oscillator 14. Among them:

[0038] The airflow sensing circuit 13 is connected to the logic function circuit, and is used to detect the change of the capacitance value of the electronic cigarette microphone head and output an induction signal. The electronic cigarette microphone head includes a pole piece and a diaphragm, and the pole piece and the diaphragm constitute a capacitor. When smoking, the distance between the diaphragm and the pole piece changes, resulting in a change in the capacitance value. The vibration of the diaphragm can be obtained by detecting the change of the capacitance value of the electronic cigarette microphone head using the airflow sensing circuit.

[0039] The airflow sensing circuit includes an operational amplifier circuit, which is connected to the electronic cigarette microphone head. The change in capacitance value generated by the vibration of the diaphragm of the electronic cigarette microphone head is processed by the operational amplifier circuit to generate a square wave signal output, that is, the sensing signal is output in the form of a square wave.

[0040] The oscillator 14 is connected to the logic function circuit and is used to generate an oscillation signal. The oscillator generates an oscillation signal with a certain frequency.

[0041] The logic function circuit calculates the frequency of the sensing signal according to the oscillation signal, and outputs an atomization signal when the frequency of the sensing signal is within a set frequency range.

[0042] The operational amplifier circuit in the logic function circuit compares the oscillation signal and the induction signal, and calculates the frequency of the square wave signal generated by the change in the capacitance value based on the oscillation signal, thereby judging the change in the electronic cigarette. Because the action of smoking will cause a specific change in the capacitor, a square wave signal with a specific frequency will be generated. When the logic function circuit detects a square wave signal within this range, it will output an atomization signal to trigger the smoking working mode, thereby ensuring the smoking sensitivity of the electronic cigarette and avoiding false triggering.

[0043] In order to prevent the chip temperature from being too high, the electronic cigarette driver chip also includes a temperature control circuit 15 connected to the logic function circuit for controlling the temperature of the electronic cigarette driver chip. The temperature control circuit can also be implemented by controlling the output. For example, when the temperature is detected to be too high, the output duty cycle is adjusted through the PWM circuit, the output is reduced, or even the output is directly cut off.

[0044] In order to protect the chip and prevent the chip from burning due to excessive current, the electronic cigarette driver chip also includes an overcurrent protection circuit 16 connected to the logic function circuit and used for entering a standby mode when the output voltage exceeds a preset voltage.

[0045] In addition, the electronic cigarette driver chip also includes a charging circuit 17 connected to the logic function circuit. The charging circuit monitors the battery voltage through an internal comparison circuit, and starts charging in a trickle charging mode. When the voltage reaches a set threshold, it switches to a constant voltage charging mode in a very short time.

[0046] In order to enable the user to intuitively judge the working state of the electronic cigarette, the electronic cigarette driving chip also includes an LED control circuit 18 connected to the logic function circuit and controlling the LED to turn on, off or flash according to the working state of the electronic cigarette.

[0047] In order to adjust the working state of the chip, the electronic cigarette driver chip also includes a one-time programmable (OTP) storage circuit 19 connected to the logic function circuit, and the one-time programmable storage circuit includes a voltage output circuit, a polysilicon fuse (poly fuse) and a fuse control field effect transistor.

[0048] One end of the voltage output circuit is connected to a power source;

[0049] A polysilicon fuse is connected in series between the power supply and the voltage output circuit;

[0050] The gate of the fuse control field effect transistor is connected to the logic function circuit, the drain is connected to the connection between the polysilicon fuse and the voltage output circuit, and the source is grounded.

[0051] When in use, the set value can be transmitted to the logic function circuit according to the IIC communication protocol. The logic function control circuit sends the data to the polysilicon fuse of the corresponding address of the one-time programmable storage circuit, and controls the switching state of the field effect switch through the polysilicon fuse, thereby adjusting the working state of the chip.

[0052] Through the one-time programmable storage circuit, users can set the charging voltage, charging current, LED flashing mode and the trigger voltage for entering the protection mode according to their own needs.

[0053] In this specific embodiment, the voltage output circuit includes a first field effect transistor M1, a second field effect transistor M2, a third field effect transistor M3, a fourth field effect transistor M4, a fifth field effect transistor M5, a sixth field effect transistor M6, a seventh field effect transistor M7, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4. The polysilicon fuse includes a first polysilicon fuse P1 and a second polysilicon fuse P2. The fuse control field effect transistor includes a first fuse control field effect transistor M8 and a second fuse control field effect transistor M9.

[0054] The first polysilicon fuse P1 and the second polysilicon fuse P2 are connected between the power supply VDD and the source of the first field effect transistor M1 and the second field effect transistor M2, respectively. In this specific embodiment, a seventh field effect transistor M7 is connected between the first polysilicon fuse P1, the second polysilicon fuse P2 and the power supply VDD, and the gate of the seventh field effect transistor M7 is connected to a fourth resistor R4. The gates of the first field effect transistor M1 and the second field effect transistor M2 are connected together, and the drains of the first field effect transistor M1 and the second field effect transistor M2 are connected to the drains of the third field effect transistor M3 and the fourth field effect transistor M4, respectively. The gates of the third field effect transistor M3 and the fourth field effect transistor M4 are connected together, and the drains are connected together. The gates of the fifth field effect transistor M5 and the sixth field effect transistor M6 are connected to the drains of the first field effect transistor M1 and the second field effect transistor M2 respectively, the first resistor R1 is connected in parallel between the drain and the source of the fifth field effect transistor M5, the second resistor R2 and the third resistor R3 are connected in parallel between the drain and the source of the sixth field effect transistor M6, the input terminal Vin is connected to the drain of the fifth field effect transistor M5, and the output terminal Vout is connected to the source of the sixth field effect transistor M6.

[0055] The drains of the first fuse control field effect transistor M8 and the second fuse control field effect transistor M9 are connected to the first polysilicon fuse P1 and the second polysilicon fuse P2 respectively, the sources are grounded, and the gates are connected to the logic function circuit. The control signal output by the logic function circuit controls whether the first fuse control field effect transistor M8 and the second fuse control field effect transistor M9 are turned on. When the first fuse control field effect transistor M8 or the second fuse control field effect transistor M9 is turned on, the corresponding first polysilicon fuse P1 or the second polysilicon fuse P2 is blown, thereby cutting off the connection between the power supply VDD and the voltage output circuit, thereby affecting the output.

[0056] The present invention arranges polysilicon fuses and fuse control field effect transistors, and controls the on and off of the fuse control field effect transistors through a logic function control circuit to realize the on and off of the corresponding polysilicon fuses, thereby adjusting the voltage output circuit. Since some polysilicon fuses are blown, they are not easily modified again after being adjusted to the state required by the user, and the user experience is better.

[0057] The present invention can be used for an electronic cigarette, and the electronic cigarette has the electronic cigarette driving circuit.

[0058] Please also see Figure 4 When applied to an electronic cigarette, in order to further prevent false triggering, the electronic cigarette further includes a body 8 and a human infrared sensor 9. The human infrared sensor is arranged on the body, and sends a wake-up signal after detecting a human body; the logic function circuit is connected to the human infrared sensor, and the logic function circuit is in a standby state under normal conditions, and returns to a normal working state after receiving the wake-up signal.

[0059] The body 8 includes a grip 81 and a nozzle 82 disposed at the upper end of the grip, and the human infrared sensor can be disposed on the nozzle 82 or the grip 81, or both. In this case, it can be ensured that only a person can turn on the electronic cigarette, effectively preventing the electronic cigarette from being accidentally started due to airflow or vibration in the environment.

[0060] The present invention has the following characteristics:

[0061] 1. The present invention separates the driving MOS tube from the chip, and the performance of the external driving MOS tube is stronger than the integrated built-in MOS tube. The design of the driving MOS tube is not limited by the chip, and the area of ​​the driving MOS tube can be expanded according to the needs during design to enhance the output power. The present invention places the driving MOS tube externally, has extremely strong driving capability, and has high output power.

[0062] 2. After integration, the circuit consistency is better than that of discrete components, and the internal storage devices such as POLY FUSE can easily correct individual differences and further improve the consistency problem, thereby increasing the yield rate and reducing production costs.

[0063] 3. The chip is charged by a combination of trickle current and constant voltage modes, which is efficient and safe. The charging voltage can also be set independently. It will not damage the battery due to overcharging, nor will it require users to charge frequently due to insufficient charging.

[0064] 4. There are multiple protection circuits inside to monitor the working status of the chip. When the working voltage is abnormal, the protection circuit will respond at an extremely fast speed and control the chip to enter the standby state to ensure that the chip will not be damaged and ensure that the chip can operate stably after long-term work.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic cigarette driver chip with adjustable state, including a logic function circuit, characterized in that: The electronic cigarette driving chip with adjustable state further includes a one-time programmable storage circuit connected to the logic function circuit, and the one-time programmable storage circuit includes: A voltage output circuit, one end of which is connected to a power supply; a polysilicon fuse connected in series between the power supply and the voltage output circuit; A fuse control field effect transistor, whose gate is connected to the logic function circuit, whose drain is connected to the connection between the polysilicon fuse and the voltage output circuit, and whose source is grounded; The voltage output circuit comprises: a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth field effect transistor, a sixth field effect transistor, a seventh field effect transistor, a first resistor, a second resistor, a third resistor and a fourth resistor; The polysilicon fuse includes a first polysilicon fuse and a second polysilicon fuse; The fuse control field effect transistor includes a first fuse control field effect transistor and a second fuse control field effect transistor; The seventh field effect transistor is connected between the first polysilicon fuse and the second polysilicon fuse and the power supply, the gate of the seventh field effect transistor is connected to the fourth resistor, the gates of the first field effect transistor and the second field effect transistor are connected together, the drains of the first field effect transistor and the second field effect transistor are connected to the drains of the third field effect transistor and the fourth field effect transistor respectively, the gates of the third field effect transistor and the fourth field effect transistor are connected together, and the drains are connected together; the gates of the fifth field effect transistor and the sixth field effect transistor are connected to the drains of the first field effect transistor and the second field effect transistor respectively, the first resistor is connected in parallel between the drain and the source of the fifth field effect transistor, and the second resistor and the third resistor are connected in parallel between the drain and the source of the sixth field effect transistor; The drains of the first fuse control field effect transistor and the second fuse control field effect transistor are connected to the first polysilicon fuse and the second polysilicon fuse respectively, the sources are grounded, and the gates are connected to the logic function circuit.

2. The electronic cigarette driver chip with adjustable state according to claim 1, characterized in that: The electronic cigarette driving chip includes: The airflow sensing circuit is used to detect the change of the microphone capacitance value and output a sensing signal; an oscillator connected to the logic function circuit and used to generate an oscillation signal; A logic function circuit is connected to the airflow sensing circuit and the oscillator. The logic function circuit calculates the frequency of the sensing signal according to the oscillation signal and outputs an atomization signal when the frequency of the sensing signal is within a set frequency range.

3. The adjustable state electronic cigarette driver chip according to claim 2, characterized in that: The electronic cigarette driving chip also includes a sensing signal amplifying circuit, which is connected in series between the airflow sensor circuit and the logic function circuit, amplifies the sensing signal and converts the sensing signal into a square wave signal and outputs it to the logic function circuit.

4. The adjustable state electronic cigarette driver chip according to claim 3, characterized in that: The electronic cigarette driver chip further includes a temperature control circuit connected to the logic function circuit and used for controlling the temperature of the driver chip.

5. The adjustable state electronic cigarette driver chip according to claim 4, characterized in that: The electronic cigarette driving chip also includes an overcurrent protection circuit connected to the logic function circuit and used for entering a standby mode when the output voltage exceeds a preset voltage.

6. The electronic cigarette driver chip with adjustable state according to claim 5, characterized in that: The electronic cigarette driving chip also includes a charging circuit connected to the logic function circuit.

7. The adjustable state electronic cigarette driver chip according to claim 6, characterized in that: The driving chip also includes an LED control circuit connected to the logic function circuit and controlling the LED to turn on, off or flash according to the working state of the electronic cigarette.

8. An electronic cigarette, characterized in that: The electronic cigarette comprises the electronic cigarette driving chip with adjustable state as described in any one of claims 1-7.

9. The electronic cigarette according to claim 8, characterized in that: The electronic cigarette also includes: ontology; A human infrared sensor is disposed on the main body and sends a wake-up signal after detecting a human body; The logic function circuit is connected to the human infrared sensor. The logic function circuit is in a standby state under normal conditions and returns to a normal working state after receiving the wake-up signal.

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