Automatic driving circuit of electronic atomization terminal and electronic atomization terminal

Abstract

This application discloses an automatic driving circuit and an electronic atomizing terminal. The automatic driving circuit includes a bias circuit, a resonant circuit, a coupling circuit, a level switching unit, two MOSFET switching circuits, a comparator, and a first NMOS transistor. The resonant circuit is connected to the atomizing plate through the coupling circuit. Each MOSFET switching circuit is connected to the output terminal of the bias circuit. The control terminal of each MOSFET switching circuit is connected to one output terminal of the level switching unit. The output terminal of each MOSFET switching circuit is connected to one input terminal of the comparator. The output terminal of the comparator is connected to the gate of the first NMOS transistor, and the source of the first NMOS transistor is connected to the resonant circuit. The level switching unit first drives the resonant circuit to start oscillating by changing the control signal output by each output terminal during a first preset working time of timer counting. Then, during a second preset working time of timer counting, it controls the resonant circuit to stop working by changing the control signal output by each output terminal.

Description

Technical Field

[0001] This application relates to the field of electronic atomization terminal technology, specifically to the automatic drive circuit of electronic atomization terminal and electronic atomization terminal. Background Technology

[0002] E-liquid in e-cigarettes is the raw material for generating vapor. The e-liquid on the surface of the atomizer is guided from the reservoir by wicking cotton. The atomizer, as the core component of an e-cigarette, uses voltage sampling from the battery to set a PWM (Pulse Width Modulation) circuit to generate a corresponding duty cycle signal, driving the connection and disconnection between the power supply and the atomizer (essentially a heating resistor or an electrode plate supporting high-frequency vibration). Therefore, the stable and normal operation of an e-cigarette depends on the working state of the atomizer.

[0003] When e-liquid leaks from the reservoir or the wicking cotton malfunctions, causing the wicking speed to be too fast, a large amount of e-liquid accumulates on the surface of the atomizer plate. The atomizer plate is in an oil-soaked state, and the smoker's intuitive feeling is that the smoke is very small and there is e-liquid splattering. At this time, the vibration and friction loss on the surface of the atomizer plate increases, which increases the energy required for resonance.

[0004] When the atomizing module is abnormally short-circuited, the input current of the resonant drive module increases abnormally. At this time, the user needs to manually and promptly turn off the power module to protect the circuit. The user also needs to check the circuit connection regularly.

[0005] In existing technologies, constant voltage output circuits are used to maintain the resonant drive module in the electronic cigarette in a stable current state, or consumers need to rely on intuitive user experience to judge whether the electronic cigarette has the aforementioned abnormal working state. However, this cannot effectively prevent the aforementioned abnormal situation from occurring. If a high-precision analog-to-digital converter and a large number of digital computing circuits are connected for real-time voltage detection and / or to maintain constant voltage output, the number of MOSFETs will increase significantly. Summary of the Invention

[0006] This application discloses an automatic drive circuit for an electronic atomizing terminal and the electronic atomizing terminal itself. The specific technical solution is as follows:

[0007] The automatic driving circuit of the electronic atomizing terminal includes a bias circuit, a resonant circuit, a coupling circuit, a level switching unit, two MOSFET switching circuits, a comparator, and a first NMOS transistor. The resonant circuit is connected to the atomizing plate through the coupling circuit. Each MOSFET switching circuit is connected to the output of the bias circuit, the control terminal of each MOSFET switching circuit is connected to one output of the level switching unit, the output of each MOSFET switching circuit is connected to one input of the comparator, the output of the comparator is connected to the gate of the first NMOS transistor, and the source of the first NMOS transistor is connected to the resonant circuit. The drain of the first NMOS transistor and the bias circuit are both connected to the battery of the electronic atomizing terminal. The automatic driving circuit also includes a timer. The timer is connected to the comparator and the level switching unit. The level switching unit is used to drive the resonant circuit to start oscillating by changing the control signal output by each output during a first preset working time counted by the timer. Then, during a second preset working time counted by the timer, it controls the resonant circuit to stop generating oscillation signals by changing the control signal output by each output.

[0008] Furthermore, the automatic drive circuit also includes a suction sensor connected to the level switching unit. The suction sensor is used to determine whether there is a suction action by detecting changes in airflow. When the suction sensor detects that the change in airflow value is lower than a preset airflow threshold, there is no suction action. The suction sensor then generates a non-suction action signal and inputs it to the level switching unit, which then triggers the level switching unit to control the resonant circuit to stop generating oscillation signals by changing the control signals output by each output terminal.

[0009] Furthermore, during the period when the timer counts each of the first preset working times, the MOS transistor switching circuit connected to the positive input terminal of the comparator is turned on by the control signal output from the output terminal of the level switching unit, and the MOS transistor switching circuit connected to the negative input terminal of the comparator is turned off by the control signal output from the output terminal of the level switching unit. The signal output by the comparator turns on the first NMOS transistor, so that the resonant circuit starts to work. During the period when the timer counts each of the second preset working times or during the period when the attraction sensor does not generate a suction action signal, the MOS transistor switching circuit connected to the positive input terminal of the comparator is turned off by the control signal output from the output terminal of the level switching unit, and the MOS transistor switching circuit connected to the negative input terminal of the comparator is turned on by the control signal output from the output terminal of the level switching unit. The control signal output by the comparator turns off the first NMOS transistor, so that the resonant circuit stops generating an oscillation signal.

[0010] Further, the level switching unit includes a first selector and a second selector; the level switching unit internally has two different control signals, which are respectively input to the two input terminals of the first selector and the two input terminals of the second selector; the level switching unit has a first output terminal and a second output terminal, the output terminal of the first selector being the first output terminal and the output terminal of the second selector being the second output terminal; the counting output terminal of the timer is connected to the selection control terminal of the first selector, and the counting output terminal of the timer is also connected to the selection control terminal of the second selector; the timer is used to first output a first counting flag signal to the level switching unit after counting a first preset working time, then output a second counting flag signal to the level switching unit after counting a second preset working time, and then count the first preset working time, and so on. The flow counting is performed for a first preset working time and a second preset working time. Whenever the selection control terminal of the first selector receives a first counting flag signal, the first selector selects and outputs a control signal different from the control signal output by the first output terminal within the first preset working time. Whenever the selection control terminal of the second selector receives a first counting flag signal, the second selector selects and outputs a control signal different from the control signal output by the second output terminal within the first preset working time. Whenever the selection control terminal of the first selector receives a second counting flag signal, the first selector selects and outputs a control signal different from the control signal output by the first output terminal within the second preset working time.

[0011] Furthermore, the first preset working time is a counting time determined to ensure that the amount of mist emitted by the atomizing plate does not exceed the upper limit of the expected range; the second preset working time is a counting time determined to ensure that the amount of mist emitted by the atomizing plate is not lower than the lower limit of the expected range; the first preset working time is set to be greater than the second preset working time; the automatic drive circuit first triggers the resonant circuit to start working within the first preset working time, and then stops working within the second preset working time; the automatic drive circuit first triggers the resonant circuit to stop working within the second preset working time, and then starts working within the first preset working time.

[0012] Furthermore, each MOS transistor switching circuit includes a PMOS transistor, a pull-up resistor, an NMOS transistor, and a pull-down resistor. The source of the PMOS transistor is connected to the output of the bias circuit, the source of the PMOS transistor is connected to one end of the pull-up resistor, the gate of the PMOS transistor is connected to the other end of the pull-up resistor, and the drain of the PMOS transistor is connected to one input of the comparator. The gate of the PMOS transistor is connected to the drain of the NMOS transistor, the gate of the NMOS transistor is connected to one end of the pull-down resistor, the source of the NMOS transistor and the other end of the pull-down resistor are both grounded, and the gate of the NMOS transistor is connected to one output of the level switching unit. The gate of the NMOS transistor is the control terminal of the MOS transistor switching circuit, and the drain of the PMOS transistor is the output terminal of the MOS transistor switching circuit.

[0013] Furthermore, if the control signals output from the two output terminals of the level switching unit are different, the gate input voltage of the switching NMOS transistor included in each MOS transistor switching circuit will be different, and thus the drain output voltage of the switching PMOS transistor included in each MOS transistor switching circuit will be different.

[0014] Further, the bias circuit includes a first resistor, a second resistor, and a third resistor; the coupling circuit includes a first capacitor, a second capacitor, and a sixth resistor; the resonant circuit includes a third capacitor, a fourth capacitor, a first inductor, and a second inductor; one end of the first resistor is connected to the positive terminal of the battery of the electronic atomizing terminal, the other end of the first resistor is grounded through the second resistor, and the other end of the first resistor is connected to one end of the third resistor, the other end of the third resistor being configured as the output terminal of the bias circuit; the first capacitor and the atomizing plate are connected in series, one end of the series branch is connected to the positive terminal of the battery of the electronic atomizing terminal, the other end of the series branch is connected to the output terminal of the bias circuit, one end of the second capacitor is connected to the positive terminal of the battery of the electronic atomizing terminal, and the other end of the second capacitor is connected to one end of the sixth resistor, the sixth... The other end of the resistor is connected to the output of the bias circuit; one end of the fourth capacitor is connected to the output of the bias circuit, and the other end of the fourth capacitor is grounded through the second inductor; one end of the first inductor is connected to the source of the first NMOS transistor, and the other end of the first inductor is connected between the fourth capacitor and the second inductor; one end of the third capacitor is connected to the positive terminal of the battery of the electronic atomization terminal, and the other end of the third capacitor is connected between the fourth capacitor and the second inductor; the positive power supply terminal of the comparator is connected to the positive terminal of the battery of the electronic atomization terminal, and the negative power supply terminal of the comparator is grounded; the positive input terminal of the comparator is connected to the drain of the switching PMOS transistor included in one of the MOS transistor switching circuits, and the negative input terminal of the comparator is connected to the drain of the switching PMOS transistor included in another MOS transistor switching circuit.

[0015] An electronic atomizing terminal includes the automatic drive circuit as described above.

[0016] Furthermore, the electronic atomizing terminal includes a vaporizer and a cartridge, the automatic drive circuit is disposed inside the vaporizer, and the atomizing plate is disposed inside the cartridge, wherein the e-liquid in the electronic atomizing terminal is the raw material for generating vapor.

[0017] The technical advantage of this application lies in the following: This application uses a comparator to compare the output signals of two MOSFET switching circuits, and uses a timer to control the level switching unit to output different control signals in turn to periodically change the on / off state of the two MOSFET switching circuits. The comparator and the first MOSFET then feed back to the resonant circuit, driving the atomizing plate to oscillate and atomize the e-liquid, or driving the atomizing plate to stop oscillating, thus changing the degree of atomization. This achieves the following: the atomizing plate's output increases to a preset upper limit within a first preset working time and then decreases to a preset lower limit within a second preset working time. Therefore, within a given time... Under the control of the timer, the vapor output of the atomizing plate is adjusted to the expected range, realizing the time-division multiplexing of the resonant working mode. This allows the MOSFET to dissipate the accumulated heat within a limited time, reducing the temperature of the MOSFET. Smokers do not need to monitor the vapor status and current abnormality in real time. It does not require the use of high-precision analog-to-digital converters and excessive digital logic circuits for real-time detection. It avoids automatically stopping operation only when abnormal conditions such as dry burning, oil immersion, or short circuit are detected, effectively preventing the aforementioned abnormalities from occurring during the use of the electronic atomizing terminal. It also reduces the battery consumption and the number of MOSFETs used in the electronic atomizing terminal.

[0018] Because the automatic drive circuit maintains a periodic mist output state by setting the first and second preset working times, it can prevent overheating problems caused by abnormal working states such as dry burning, oil immersion, or short circuits, even without achieving constant power output of the atomizer in the electronic atomization terminal. Furthermore, when the suction sensor detects that the airflow value is lower than the preset airflow threshold, it does not generate a suction action signal, and then triggers the level switching unit to control the atomizing plate to stop resonance by changing the control signal output at each output terminal. This ensures that the amount of vapor supplied remains within the expected range during the intervals of the user's suction action, reducing the user's vapor intake and improving the safety and lifespan of the electronic atomization terminal to a certain extent. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the automatic drive circuit of an electronic atomizing terminal disclosed in one embodiment. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0021] E-liquid in electronic cigarettes is the raw material for generating vapor. The e-liquid on the surface of the atomizer is introduced from the reservoir through wicking cotton. As the core component of high-frequency ultrasonic electronic cigarettes, the stable operation of the electronic cigarette depends on the working state of the atomizer, that is, whether the atomizer can stably atomize the e-liquid guided to its surface. The atomizer can be composed of electrode plates, which, when a high-frequency voltage signal is applied by an external circuit, generate surface elastic waves, atomizing the e-liquid and other liquids on the surface. When e-cigarettes operate continuously at high temperatures, they are prone to dry burning, oil immersion, or short circuits. In such cases, the internal electronic components of the e-cigarette will not function properly. The operating states of the internal drive circuit of the e-cigarette include at least one of the following: short circuit, overcurrent, and open circuit. In severe cases, the working circuit may be burned out. Existing ultrasonic e-cigarette working circuits require the connection of high-precision analog-to-digital converters and a large number of digital computing circuits for real-time voltage detection and / or maintaining a constant voltage output in order to detect the aforementioned abnormal operating states in a timely manner. That is, the circuit power supply is automatically or manually cut off only when abnormal states such as dry burning, oil immersion, or short circuit are detected. Moreover, the placement of a large number of MOSFETs in the limited size of the e-cigarette increases the production cost.

[0022] To address the aforementioned technical deficiencies, this embodiment discloses an automatic driving circuit for an electronic atomization terminal, applicable to electronic cigarettes and other atomization terminal devices. The automatic driving circuit includes a bias circuit, a resonant circuit, a coupling circuit, a level switching unit, two MOS transistor switching circuits, a comparator, and a first NMOS transistor. The two MOS transistor switching circuits are sequentially configured as follows: Figure 1 The first MOSFET switching circuit and the second MOSFET switching circuit, the first NMOS transistor is Figure 1 The MN1 shown is essentially an oscillating circuit that drives the atomizing plate to a resonant state. Combined with... Figure 1It can be seen that the resonant circuit is connected to the atomizing plate sequentially through coupling circuits. Each MOSFET switching circuit is connected to the output terminal of the bias circuit. The control terminal of each MOSFET switching circuit is connected to one output terminal of the level switching unit. The output terminal of each MOSFET switching circuit is connected to one input terminal of the comparator, and the output terminal of the comparator is connected to the gate of the first NMOS transistor, so that the output signal of the comparator is used as the comparison result between the output voltages of the two MOSFET switching circuits, and thus reflects the on / off status of the two MOSFET switching circuits. The comparator output has only two states: low level and high level. Therefore, the integrated operational amplifier in it often operates in the nonlinear region, allowing the output to have a frequency pulse signal or maintain a constant level. That is, the output signal of the comparator does not necessarily maintain a fixed voltage value, creating conditions for the resonant circuit and even the atomizing plate to oscillate. When both MOSFET switching circuits are on or off, the comparator outputs a low control signal (minimum voltage value as low as 0V), which is suitable for the scenario where the automatic drive circuit automatically detects that the user has stopped inhaling from the electronic atomizing terminal. When a MOSFET switch circuit connected to the positive input terminal of the comparator is turned on and a MOSFET switch circuit connected to the negative input terminal of the comparator is turned off, the comparator outputs a high control signal (maximum voltage reaching VDD), and the output signal has a certain frequency, which facilitates driving the resonant circuit to generate an oscillation signal to drive the atomizing plate to produce vapor. When the MOSFET switch circuit connected to the negative input terminal of the comparator is turned on and a MOSFET switch circuit connected to the positive input terminal of the comparator is turned off, the comparator outputs a low control signal (minimum voltage as low as 0V), and the output signal has a certain frequency. The source of the first NMOS transistor MN1 is connected to the resonant circuit, providing the voltage and frequency required to drive the atomizing plate; the drain of the first NMOS transistor MN1 and the bias circuit are both connected to the battery of the electronic atomizing terminal, i.e., connected to VDD. The battery of the electronic atomizing terminal generally provides a voltage of 3.3 to 8.2V, corresponding to VDD, which can supply power to the automatic drive circuit. This constitutes the supply source of frequency and voltage for the resonant operation of the atomizing plate, that is, the driving frequency and driving voltage for the atomizing plate are provided based on the conduction and cutoff of each MOS transistor switching circuit.

[0023] In this embodiment, the automatic drive circuit further includes a timer; such as Figure 1As shown, the timer is connected to the comparator. In some embodiments, the timer's counting input is connected to the comparator's output. The timer's counting input can be the data input or clock input of a register that makes up the timer, to detect the pulse width information of the comparator's output signal according to the system clock cycle. The timer is used to time the signal output by the comparator. Implementation includes counting the level width or the width of two adjacent edges (parameters such as pulse interval) of the constant-level signal output by the comparator according to a predetermined clock cycle, to time the duration of the pulse signal or constant-level signal output by the comparator, until the counting time reaches a first preset working time or a second preset working time.

[0024] When the timer's count value is used to represent the comparator maintaining the same output level signal, the time the comparator maintains a high-level output signal corresponds to the time period during which all MOSFETs in the MOSFET switching circuit remain on (the time period during which the MOSFET switching circuit remains on); the timer counts the time the comparator maintains a low-level output signal, which corresponds to the time period during which the MOSFETs in the MOSFET switching circuit remain off (the time period during which the MOSFET switching circuit remains off).

[0025] The comparator output signal can have a certain frequency and a certain voltage. The timer count value is used to represent the duration of several pulse signals. The timer counts the time consumed by the comparator continuously outputting several pulse signals. Specifically, when the frequency of the signal input to the positive and negative input terminals of the comparator changes, the comparator can output pulse signals of different frequencies. The timer obtains the time consumed by several pulse signals by counting the edge width (pulse interval) of each two adjacent pulses output by the comparator. Then, the signal output by the comparator, based on controlling the on and off state of the first NMOS transistor, provides the frequency and voltage for driving the atomizing sheet to the resonant circuit.

[0026] The timer is connected to the level switching unit. In some embodiments, the timer's counting output terminal is connected to the selection control terminal of the level switching unit. The timer's counting output terminal is used to output the counting result, including the timing information of the continuously output high-level signal (i.e., the time period during which the MOS transistor switching circuit remains on) or the timing information of the continuously output low-level signal (i.e., the time period during which the MOS transistor switching circuit remains off), or the sum of the two. The counting result output by the timer's counting output terminal serves as the selection condition or trigger signal for the level switching unit to output the corresponding level signal, so as to control each output terminal of the level switching unit to periodically change the on / off state of the corresponding connected MOS transistor switching circuit.

[0027] In this embodiment, the level switching unit is used to drive the resonant circuit to start oscillating by changing the control signal output by each output terminal during a first preset working time counted by the timer; and then, during a second preset working time counted by the timer, to control the resonant circuit to stop generating oscillation signals by changing the control signal output by each output terminal. Specifically, after the automatic drive circuit is powered on, the timer first starts counting the first preset working time, then starts counting the second preset working time, and then counts the first preset working time again, repeating this counting process to alternately control the resonant circuit to start and stop working in different time periods. In this embodiment, the resonant circuit starts oscillating during the first preset working time and stops generating oscillation signals during the second preset working time. Stopping the generation of oscillation signals indicates that the resonant circuit stops working to drive the atomizing plate to stop resonating, and starting oscillation indicates that the resonant circuit starts working to drive the atomizing plate to resonate and atomize the e-liquid. In this embodiment, each time the timer counts the first preset working time, the control signal output from each output terminal of the level switching unit is changed to drive the resonant circuit to start working and cause the atomizing plate to reach a resonant state. Then, each time the timer counts the second preset working time, the control signal output from each output terminal of the level switching unit is changed to drive the resonant circuit to stop working and prevent the atomizing plate from oscillating. The first preset working time and the second preset working time are two adjacent time periods with different delay lengths. Specifically, the start time of the period when the atomizing plate does not supply smoke is the start time of the second preset working time and also the end time of the previous first preset working time. In addition, the end time of the period when smoke cannot be supplied is the same as the start time of the period when smoke is supplied, which is also the start time of a new first preset working time. The level switching unit is internally equipped with multiple selectors to select and output the corresponding level signal after each first preset working time or second preset working time, or is equipped with an inverter to flip the control signal output in the previously elapsed time period after each first preset working time or second preset working time, thereby changing the on / off state of the corresponding connected MOS transistor switching circuit. In this embodiment, both the first preset working time and the second preset working time can be configured to limit the amount of e-liquid evaporated by the atomizing plate within a time period, and the two times are generated in a sequential order, corresponding to different stages of smoke generation by the atomizing plate.By setting the first preset working time and the second preset working time sequentially to maintain this intermittent mist output and non-mist output working state, the relevant MOS transistors can dissipate heat in time during the limited time of disconnection, while preserving some of the smoke generated earlier. This can limit the amount of smoke inhaled by the user and ensure the user's subsequent smoking experience. Thus, the safety and service life of the electronic atomization terminal are improved through time-sharing oscillation operation.

[0028] In summary, the automatic drive circuit disclosed in this embodiment uses a comparator to compare the output signals of two MOSFET switching circuits and a timer to control the level switching unit to output different control signals in turn at different time periods to periodically change the on / off state of the two MOSFET switching circuits. The comparator and the first MOSFET then feed back to the resonant circuit to drive the atomizing plate to oscillate and atomize the e-liquid or to stop the atomizing plate from oscillating. This controls the periodic on / off oscillation signal of the atomizing plate in the electronic atomizing terminal, automatically adjusting the atomization level of the e-liquid. The resonant circuit automatically stops generating oscillation signals, promptly dissipating the heat of the MOSFET and the first NMOS in the currently off MOSFET switching circuit, reducing the problem of continuous temperature rise and voltage overshoot of the MOSFET. Moreover, it does not require the use of a high-precision analog-to-digital converter and excessive digital logic calculation circuits for real-time detection, effectively preventing the aforementioned abnormal situations from occurring during the use of the electronic atomizing terminal, and also reducing the battery consumption and the number of MOSFETs used in the electronic atomizing terminal, saving production costs.

[0029] Based on the above embodiments, the automatic drive circuit further includes an attraction sensor connected to the level switching unit. In some embodiments, the selection control terminal of the level switching unit is connected to the detection result output terminal of the attraction sensor. The suction action signal or non-suction action signal output by the detection result output terminal of the attraction sensor serves as the selection signal for the level switching unit to provide a corresponding level signal. This controls each output terminal of the level switching unit to periodically change the on / off state of the corresponding connected MOS transistor switching circuit, thereby changing the operating state of the resonant circuit. Specifically, the attraction sensor is used to determine whether a suction action exists by detecting changes in airflow. When the attraction sensor detects that the airflow value is lower than a preset airflow threshold, that is, when it determines that the airflow value (including flow rate) flowing from the non-mouthlet side to the mouthlet side of the electronic atomizing terminal is lower than the preset airflow threshold, there is no suction action, i.e., the user is not smoking. In this case, the attraction sensor does not generate a suction action signal or generates a non-suction action signal. The generated non-suction action signal is input to the control selection terminal of the level switching unit, which then triggers the level switching unit to control the resonant circuit to stop generating an oscillation signal by changing the control signal output by each output terminal. When the suction sensor detects that the airflow value is higher than the preset airflow threshold, that is, when the airflow value (including flow rate) flowing from the non-mouthlet side to the mouthlet side of the electronic atomizing terminal is higher than the preset airflow threshold, a suction action occurs. The suction sensor then generates a suction action signal, which triggers the level switching unit to control the resonant circuit to generate an oscillation signal by changing the control signal output by each output terminal. The non-suction action signal or suction action signal generated by the suction sensor is input to the selection control terminal of the level switching unit to switch the control signal output by each output terminal. During the use of the electronic atomizing terminal, the resonant circuit starts oscillating within a first preset working time to drive the atomizing plate to generate smoke. After the first preset working time, the smoke supply of the atomizing plate has met the smoker's smoking needs. To prevent the MOS tube temperature from becoming too high or the atomizing plate from becoming oily, the resonant circuit is controlled to stop working and stops generating oscillation signals within a second preset working time, so that the atomizing plate does not continue to generate smoke within the second preset working time. Even if the existing smoke condenses on the exposed wall surface in the airflow path of the electronic atomizing terminal (for example, the exposed wall surface in the smoke flow path from the non-mouthlet side to the mouthlet side), the amount of smoke output (the smoke supply of the atomizing plate, which is also equivalent to the amount of smoke in the electronic atomizing terminal) will not fall below the lower limit of the expected range.Furthermore, when the suction sensor detects that the airflow value is lower than the preset airflow threshold, no suction action signal is generated. Instead, the level switching unit is triggered to control the atomizing plate to stop resonating by changing the control signal output by each output terminal. This allows the amount of smoke supplied to reach the expected range during the interval of the user's suction action, reducing the user's smoke intake and improving the safety and service life of the electronic atomizing terminal to a certain extent.

[0030] Furthermore, when the suction sensor changes from detecting the presence of a suction action to detecting the absence of a suction action, the level switching unit is triggered to control the resonant circuit from stopping to resuming the generation of an oscillation signal by changing the control signal output from each output terminal, thereby driving the atomizing plate to resonate and atomize the e-liquid again. Conversely, when the suction sensor changes from detecting the absence of a suction action to detecting the presence of a suction action, the level switching unit is triggered to control the resonant circuit from generating an oscillation signal to stopping the generation of an oscillation signal by changing the control signal output from each output terminal, thereby controlling the atomizing plate to stop atomizing the e-liquid and also stopping the automatic drive circuit from working.

[0031] Preferably, the implementation of the suction sensor for determining whether a suction action signal is generated by detecting changes in airflow includes: a resistance detection circuit is provided within the suction sensor to determine whether a suction action signal is present by detecting changes in resistance values, wherein changes in airflow are represented by changes in resistance values, with each airflow value corresponding to a resistance value or a current value. The detected resistance value can be compared with a preset resistance value to determine whether the user has performed a suction action (smoking action); or, a capacitance detection circuit is provided within the suction sensor to determine whether a suction action signal is present by detecting changes in capacitance values, wherein changes in airflow are represented by changes in capacitance values, with each airflow value corresponding to a capacitance value or a voltage value. The detected capacitance value can be compared with a preset capacitance value to determine whether the user has performed a suction action (smoking action). It is understood that the preset resistance and preset capacitance values ​​need to be obtained in advance through experiments, and a lookup table of preset resistance values ​​and smoking states is stored in the memory of the electronic atomization terminal.

[0032] As one embodiment, during each of the first preset working times counted by the timer, the MOS transistor switching circuit connected to the positive input terminal of the comparator is turned on by the control signal output by the output terminal of the level switching unit, and the MOS transistor switching circuit connected to the negative input terminal of the comparator is turned off by the control signal output by the output terminal of the level switching unit. The signal output by the comparator turns on the first NMOS transistor, so that the resonant circuit starts to work, that is, the resonant circuit starts to drive the atomizing plate to reach the resonant state and starts to atomize the e-liquid.

[0033] When the timer counts each second preset working time or when the suction sensor does not generate a suction action signal, the MOS transistor switching circuit connected to the positive input terminal of the comparator is turned off by the control signal output by the output terminal of the level switching unit, and the MOS transistor switching circuit connected to the negative input terminal of the comparator is turned on by the control signal output by the output terminal of the level switching unit. The control signal output by the comparator turns off the first NMOS transistor, so that the resonant circuit stops generating oscillation signals, that is, controls the resonant circuit to stop working, and the atomizing plate stops resonating.

[0034] Therefore, the first step of the automatic drive circuit's operation is as follows: When the MOS transistor switching circuit connected to the positive input terminal of the comparator is turned on by the control signal output from the output terminal of the level switching unit, the MOS transistor switching circuit connected to the negative input terminal of the comparator is turned off by the control signal output from the output terminal of the level switching unit. The control signal that turns on the MOS transistor switching circuit connected to the positive input terminal of the comparator is a high-level signal, and the control signal that turns off the MOS transistor switching circuit connected to the negative input terminal of the comparator is a low-level signal. Then, the comparator outputs a high-level signal with frequency, turning on the first NMOS transistor MN1. This generates corresponding voltage signals on the inductor and capacitor inside the resonant circuit, enabling the resonant circuit to obtain a driving voltage and driving frequency. This drives the atomizing sheet to resonate and the first NMOS transistor MN1 to remain in the conducting state until the first preset working time has elapsed. Then, under the action of the corresponding adjusted control signal output from the output terminal of the level switching unit, the first NMOS transistor MN1 is turned off, stopping the resonant circuit from driving the atomizing sheet to resonate.

[0035] After a first preset working time, the system enters the second preset working time, and then enters the second step of the automatic drive circuit's workflow: When the MOS transistor switching circuit connected to the positive input terminal of the comparator is turned off by the control signal output from the level switching unit, the MOS transistor switching circuit connected to the negative input terminal of the comparator is turned on by the control signal output from the level switching unit. At this time, the control signal turning on the MOS transistor switching circuit connected to the negative input terminal of the comparator is a high-level signal, and the control signal turning off the MOS transistor switching circuit connected to the positive input terminal of the comparator is a low-level signal. Then, the comparator outputs a low-level signal, turning off the first NMOS transistor MN1. Therefore, it cannot provide driving voltage and driving frequency to the resonant circuit, causing the atomizing sheet to stop resonating until the second preset working time has elapsed. Then, under the control signal corresponding to the output of the level switching unit, the first NMOS transistor MN1 is turned on, returning to the first step of the working process. This cycle is repeated to switch the on and off states of the MOS transistors in the two MOS transistor switching circuits. The comparator and the first MOS transistor then feed back to the resonant circuit to adjust the amount of mist produced by the atomizing plate and suppress the temperature rise of the MOS transistors in the MOS transistor switching circuits. To avoid automatically stopping operation only when abnormal states such as dry burning, oil immersion, or short circuit are detected, this embodiment maintains a periodic mist production state by setting the first preset working time and the second preset working time alternately. This allows the relevant MOS transistors to dissipate heat within a limited time after being disconnected, and also prompts the user to check for abnormal working states such as dry burning, oil immersion, or short circuit, reducing the user's vapor intake and improving the safety and service life of the electronic atomizing terminal to a certain extent.

[0036] As one embodiment, the level switching unit includes a first selector and a second selector; the level switching unit internally has two different control signals, which are respectively input to the two input terminals of the first selector and the two input terminals of the second selector; for example... Figure 1As shown, the level switching unit is provided with a first output terminal A and a second output terminal B. In this embodiment, the output terminal of the first selector is the first output terminal, and the output terminal of the second selector is the second output terminal. The counting output terminal of the timer is connected to the selection control terminal of the first selector, and the counting output terminal of the timer is also connected to the selection control terminal of the second selector. The first selector and the second selector are both controlled by the same timer and synchronously select the corresponding control signal to output, so that the signal output by the comparator changes the on / off state of the first NMOS transistor in a timely manner. Specifically, the level switching unit is provided with a first control signal and a second control signal; the first control signal and the second control signal are respectively input to the two input terminals of the first selector so that the first selector has two signals to choose from for output; the first control signal and the second control signal are respectively input to the two input terminals of the second selector so that the first selector has two signals to choose from for output. Wherein, the first control signal is the control signal for turning off the MOS transistor switching circuit, and the second control signal is the control signal for turning on the MOS transistor switching circuit; or, the second control signal is the control signal for turning off the MOS transistor switching circuit, and the first control signal is the control signal for turning on the MOS transistor switching circuit. The first control signal and the second control signal can be two signals with different voltages or two signals with different phases, providing an effective signal source for the first selector or the second selector, and also providing control signals for the changes in the operating state of the two MOS transistor switching circuits.

[0037] In this embodiment, the timer is used to first output a first counting flag signal to the level switching unit after counting a first preset working time, and then output a second counting flag signal to the level switching unit after counting a second preset working time. Then, it counts the first preset working time, and so on, counting the first preset working time and the second preset working time in turn. In this repeated counting process, the resonant circuit is controlled to start working and stop working in different time periods. For example, it starts oscillating within the first preset working time and stops generating oscillation signals within the second preset working time.

[0038] Specifically, during the counting of the first preset working time, a first counting flag signal is output to the level switching unit. This signal can be a high-level signal, indicating that the timing operation of the comparator's output signal or the signal output from the comparator's output terminal within a preset working cycle is complete. This allows obtaining the count change value corresponding to a certain working cycle of the comparator output. When the comparator outputs a pulse signal with a certain frequency, a preset number of pulse signals will be output sequentially within the first preset working time. The preset number is the ratio of the first preset working time to the clock period of the clock signal connected to the timer. Based on this, whenever the selection control terminal of the first selector receives the first counting flag signal, the first selector selects a control signal output that is different from the control signal output by the first output terminal within the first preset working time, changing the on / off state of the MOS transistor switching circuit connected to the first output terminal. Similarly, whenever the selection control terminal of the second selector receives the first counting flag signal, the second selector selects a control signal output that is different from the control signal output by the second output terminal within the first preset working time, changing the on / off state of the MOS transistor switching circuit connected to the second output terminal.

[0039] Specifically, during the counting of the second preset working time, a second counting flag signal is output to the level switching unit. This signal can be a high-level signal, indicating that the timing operation of the comparator's output signal or the signal output from the comparator's output terminal within a short preset working cycle is complete. This allows obtaining the count change value corresponding to a certain working cycle of the comparator output. When the comparator outputs a pulse signal with a certain frequency, a preset number of pulse signals will be output sequentially within the second preset working time. The preset number is the ratio of the second preset working time to the clock period of the clock signal connected to the timer. Based on this, whenever the selection control terminal of the first selector receives the second counting flag signal, the first selector selects a control signal output that is different from the control signal output by the first output terminal within the second preset working time, changing the on / off state of the MOS transistor switching circuit connected to the first output terminal. Similarly, whenever the selection control terminal of the second selector receives the second counting flag signal, the second selector selects a control signal output that is different from the control signal output by the second output terminal within the second preset working time, changing the on / off state of the MOS transistor switching circuit connected to the second output terminal.

[0040] To achieve the periodic change of the resonant circuit's operating state (intermittently controlling the mist output of the atomizing plate, for example, increasing and then stopping, or stopping and then increasing, and so on in a cyclical adjustment), the implementation of the level switching unit is equivalent to: first, after a first preset working time, inverting the currently output control signal that turns off the MOS transistor switching circuit (which can invert the signal currently selected by the selector) into a control signal that turns on the MOS transistor switching circuit and transmitting it to the connected first MOS transistor switching circuit; and secondly, inverting the currently output control signal that turns on the MOS transistor switching circuit (which can invert the signal currently selected by the selector) into a control signal that turns on the MOS transistor switching circuit. The first MOSFET switch circuit is processed as follows: the control signal for turning off the MOSFET switch circuit is transmitted to the connected second MOSFET switch circuit. After a second preset working time, the control signal for turning off the MOSFET switch circuit is flipped (the signal currently selected by the selector can be inverted) to turn on the MOSFET switch circuit and transmitted to the connected first MOSFET switch circuit. The control signal for turning on the MOSFET switch circuit is also flipped (the signal currently selected by the selector can be inverted) to turn off the MOSFET switch circuit and transmitted to the connected second MOSFET switch circuit.

[0041] It should be noted that the aforementioned level switching unit is a logic circuit, which is a selector structure formed by connecting a series of AND gates, OR gates and NOT gates in a two-to-one logic connection, and there are at least two selectors; the aforementioned timer can be composed of shift registers, or registers and gate logic circuits, for example, forming a 555 timer to output a relatively stable count value within one cycle.

[0042] In the aforementioned embodiments, the first preset working time is a counting time determined to ensure that the vapor output of the atomizing plate does not exceed the upper limit of the expected range; the second preset working time is a counting time determined to ensure that the vapor output of the atomizing plate is not lower than the lower limit of the expected range; the first preset working time is set to be greater than the second preset working time, wherein the first preset working time can be adjusted according to the vapor output (existing airflow value in the flow path) remaining in the smoke airflow path to meet the user's smoking experience. The automatic drive circuit first triggers the resonant circuit to start working within the first preset working time, and then stops working within the second preset working time; the automatic drive circuit first triggers the resonant circuit to stop working within the second preset working time, and then starts working within the first preset working time, wherein the automatic drive circuit is located inside the electronic atomization terminal, and the e-liquid in the electronic atomization terminal is the raw material for vapor generation; here, atomization is the process of dispersing liquid into tiny droplets to form an aerosol, and the vapor output of the atomizing plate is the supply amount of the aerosol formed by the e-liquid.

[0043] Preferably, the first preset working time is not related to the time when the suction sensor generates a non-suction action signal.

[0044] Preferably, the upper limit of the first preset working time is 5 seconds, and the lower limit of the first preset working time is preferably 0.5 seconds. The upper limit of the second preset working time is 4 seconds, and the lower limit of the second preset working time is preferably 2 seconds.

[0045] In some embodiments, the amount of residual mist is increased or decreased within a expected range by repeatedly stopping and restarting the resonant circuit. Therefore, the expected range can be determined based on an upper and lower limit, preferably a lower limit of 0.1 mg or more, and more preferably 1.0 mg or more. On the other hand, the upper limit of the expected range is preferably 10.0 mg or less, and more preferably 5.0 mg or less or 3.0 mg or more. Furthermore, the expected range can be determined based on a target value for the amount of mist, for example, within ±50% of the target value (e.g., if the target value for the amount of mist is considered to be 2.0 mg, the expected range is 1.0 mg or more or 3.0 mg or less), and more preferably within ±25% (e.g., if the target value for the amount of mist is considered to be 2.0 mg, the expected range is 1.5 mg or more or 2.5 mg or less).

[0046] Therefore, in some embodiments, during the first preset working time counted by the timer, the first NMOS transistor MN1 is turned on to provide a driving voltage and driving frequency for the resonant circuit, thereby driving the atomizing sheet to resonate.

[0047] During the period when the timer finishes counting the first second preset working time and begins counting the first second preset working time again, the first NMOS transistor MN1 is turned off after being turned on for the first preset working time. This stops providing drive voltage and drive frequency to the resonant circuit. Therefore, during the first second preset working time, the temperature of the atomizing plate and the turned-off MOS transistor will decrease, and the amount of mist produced by the atomizing plate will gradually decrease, possibly to the lower limit of the expected range, or the existing amount of mist may decrease to a value greater than or equal to the lower limit of the expected range due to smoke condensation in the flow path of the electronic atomization terminal. After the first second preset working time, the automatic drive circuit selects to turn the first NMOS transistor MN1 back on, resuming the drive voltage and drive frequency for the resonant circuit. The dynamic voltage and driving frequency drive the atomizing plate to resonate during the second preset working time, thereby suppressing the vapor output from becoming too low, for example, below the lower limit of the expected range. The vapor output of the atomizing plate is automatically adjusted to ensure a basic smoking experience for the user. During the repeated switching on and off of the first NMOS transistor MN1, the vapor output of the electronic atomizing terminal can be adjusted within the expected range after exceeding the lower limit of the expected range. The state where the vapor output of the electronic atomizing terminal is higher than the lower limit of the expected range will be maintained. Thus, by alternately controlling the operation and shutdown of the resonant circuit by setting the first preset working time and the second preset working time, the automatic driving circuit can automatically adjust the vapor output of the electronic atomizing terminal to be within the expected range.

[0048] In summary, this embodiment achieves the following: the vapor output of the atomizing plate increases to a preset upper limit within a first preset working time and then decreases to a preset lower limit within a second preset working time. Under the control of the timer, the vapor output of the atomizing plate is adjusted to the expected range, realizing a time-division multiplexing method to alternately change the resonant working mode. This allows the MOSFET to dissipate the accumulated heat within a limited time, reducing the temperature of the MOSFET. Smokers do not need to monitor the smoke status and current abnormality status in real time. It does not require the use of high-precision analog-to-digital converters and excessive digital logic circuits for real-time detection, avoiding the need to automatically stop working only when abnormal states such as dry burning, oil immersion, or short circuit are detected. This effectively prevents the aforementioned abnormal situations from occurring during the use of the electronic atomizing terminal, and also reduces the battery consumption and the number of MOSFETs used in the electronic atomizing terminal.

[0049] In one embodiment, each MOSFET switching circuit includes a PMOS transistor, a pull-up resistor, an NMOS transistor, and a pull-down resistor. Except for the connection between the output of the level switching unit and the input of the comparator, the internal connections of each MOSFET switching circuit are basically the same. The source of the PMOS transistor is connected to the output of the bias circuit, the source of the PMOS transistor is connected to one end of the pull-up resistor, the gate of the PMOS transistor is connected to the other end of the pull-up resistor, and the drain of the PMOS transistor is connected to one input of the comparator. The gate of the PMOS transistor is connected to the drain of the NMOS transistor, the gate of the NMOS transistor is connected to one end of the pull-down resistor, the source of the NMOS transistor and the other end of the pull-down resistor are both grounded, and the gate of the NMOS transistor is connected to one output of the level switching unit. The gate of the NMOS transistor is the control terminal of its respective MOSFET switching circuit, the drain of the PMOS transistor is the output terminal of its respective MOSFET switching circuit, and the source of the PMOS transistor is the input terminal of its respective MOSFET switching circuit.

[0050] The two aforementioned MOSFET switching circuits correspond to Figure 1 In this circuit, one MOSFET switching circuit is a first MOSFET switching circuit, and the other is a second MOSFET switching circuit. The first MOSFET switching circuit includes a switching PMOS transistor MP11, a pull-up resistor R41, a switching NMOS transistor MN21, and a pull-down resistor R51. The first MOSFET switching circuit controls the switching of the gate of the first NMOS transistor MN1 via a comparator. The source of the switching PMOS transistor MP11 is connected to the output terminal O of the bias circuit. The second MOSFET switching circuit includes a switching PMOS transistor MP12, a pull-up resistor R42, a switching NMOS transistor MN22, and a pull-down resistor R52. The second MOSFET switching circuit controls the switching of the gate of the first NMOS transistor MN1 via a comparator. The source of the switching PMOS transistor MP12 is connected to the output terminal O of the bias circuit. In this embodiment, the automatic drive circuit reduces signal backflow between the two PMOS transistors connected to the same output port of the bias circuit and also effectively reduces the back electromotive force.

[0051] In each MOSFET switching circuit, the PMOS transistor acts as a switch. The purpose of connecting a pull-up resistor between the gate and source of the PMOS transistor is to ensure that the gate is at a high level when there is no input signal, thus turning off the PMOS transistor. Similarly, the NMOS transistor acts as a switch. The purpose of connecting a pull-down resistor between the gate and source of the NMOS transistor is to ensure that the gate is at a low level when there is no input signal, i.e., when the level switching unit does not output the control signal, thus turning off the NMOS transistor. Therefore, a defined level is provided to the gate of the MOSFET upon power-up to prevent the MOSFET from accidentally turning on due to an uncertain output level at the port during power-up. On the other hand, parasitic capacitance exists between the gate and source of the MOSFET in actual manufacturing processes. Using pull-up / pull-down resistors provides a discharge path for this parasitic capacitance when power is off; furthermore, pull-up / pull-down resistors prevent electrostatic discharge, providing circuit protection.

[0052] Combination Figure 1 It can be seen that in the first MOS transistor switching circuit, the source of the switching PMOS transistor MP11 is connected to the output terminal O of the bias circuit, the source of the switching PMOS transistor MP11 is connected to one end of the pull-up resistor R41 (i.e., the output terminal O of the bias circuit), the gate of the switching PMOS transistor MP11 is connected to the other end of the pull-up resistor R41, and the drain of the switching PMOS transistor MP11 is connected to the negative input terminal - of the comparator; the gate of the switching PMOS transistor MP11 is connected to the drain of the switching NMOS transistor MN21, the gate of the switching NMOS transistor MN21 is connected to one end of the pull-down resistor R51, the source of the switching NMOS transistor MN21 and the other end of the pull-down resistor R51 are both grounded, and the gate of the switching NMOS transistor MN21 is connected to the output terminal A of the level switching unit. In the second MOS transistor switching circuit, the source of the PMOS transistor MP12 is connected to the output terminal O of the bias circuit, the source of the PMOS transistor MP12 is connected to one end of the pull-up resistor R42 (i.e., the output terminal O of the bias circuit), the gate of the PMOS transistor MP12 is connected to the other end of the pull-up resistor R42, and the drain of the PMOS transistor MP12 is connected to the negative input terminal + of the comparator; the gate of the PMOS transistor MP12 is connected to the drain of the NMOS transistor MN22, the gate of the NMOS transistor MN22 is connected to one end of the pull-down resistor R52, the source of the NMOS transistor MN22 and the other end of the pull-down resistor R52 are both grounded, and the gate of the NMOS transistor MN22 is connected to the output terminal B of the level switching unit.

[0053] In the above embodiments, when the control signals output from the two output terminals of the level switching unit are different, the gate input voltage of the switching NMOS transistors included in each MOS transistor switching circuit is different, and therefore the drain output voltage of the switching PMOS transistors included in each MOS transistor switching circuit is different. When output terminal A of the level switching unit outputs a high-level signal and output terminal B of the level switching unit outputs a low-level signal, the source output voltage of switching PMOS transistor MP12 is less than the source output voltage of switching PMOS transistor MP11, and the comparator outputs a low-level signal, thus turning off the first NMOS transistor MN1; when output terminal A of the level switching unit outputs a low-level signal and output terminal B of the level switching unit outputs a high-level signal, the source output voltage of switching PMOS transistor MP12 is greater than the source output voltage of switching PMOS transistor MP11, and the comparator outputs a high-level signal, thus turning on the first NMOS transistor MN1.

[0054] As one example, such as Figure 1As shown, the bias circuit includes a first resistor R1, a second resistor R2, and a third resistor R3; the coupling circuit includes a first capacitor C1, a second capacitor C2, and a sixth resistor R6, wherein the first capacitor C1 in the coupling circuit is used to couple the frequency of the gate of the first NMOS transistor MN1 to the atomizing plate; the resonant circuit includes a third capacitor C3, a fourth capacitor C4, a first inductor L1, and a second inductor L2; one end of the first resistor R1 is connected to the positive terminal of the battery of the electronic atomizing terminal to access the power supply VDD provided by the battery of the electronic atomizing terminal, the other end of the first resistor R1 is grounded through the second resistor R2, and the other end of the first resistor R1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is configured as the output terminal O of the bias circuit. The first capacitor C1 and the atomizing plate are connected in series. One end of the series branch is connected to the positive terminal of the battery of the electronic atomizing terminal, and the other end of the series branch is connected to the output terminal O of the bias circuit. Preferably, one end of the atomizing plate (e.g., one end of the electrode) is connected to the power supply VDD provided by the battery of the electronic atomizing terminal, and the other end of the atomizing plate is connected to one end of the first capacitor C1. The other end of the first capacitor C1 is connected to the output terminal O of the bias circuit. One end of the second capacitor C2 is connected to the positive terminal of the battery of the electronic atomizing terminal to access the power supply VDD provided by the battery of the electronic atomizing terminal. The other end of the second capacitor C2 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the output terminal O of the bias circuit. The positive power supply terminal of the comparator is connected to the positive terminal of the battery of the electronic atomizing terminal to access the power supply VDD provided by the battery of the electronic atomizing terminal. The negative power supply terminal of the comparator is grounded. Thus, the comparator constitutes a voltage comparator structure powered by a single power supply and does not need to output a negative voltage. The positive input terminal + of the comparator is connected to the drain of the PMOS transistor in one of the MOS transistor switching circuits, and the negative input terminal - of the comparator is connected to the drain of the PMOS transistor in the other MOS transistor switching circuit. For example, corresponding to Figure 1 In the first MOSFET switching circuit, the drain of the PMOS transistor MP11 is connected to the negative input terminal (-) of the comparator, and the drain of the PMOS transistor MP12 is connected to the positive input terminal (+) of the comparator; or, the drain of the PMOS transistor MP11 is connected to the positive input terminal of the comparator, and the drain of the PMOS transistor MP12 is connected to the negative input terminal of the comparator. Figure 1Not shown in the diagram. In this embodiment, the output of the comparator is connected to the gate of the first NMOS transistor MN1, and the drain of the first NMOS transistor MN1 is connected to the battery of the e-cigarette terminal to access the power supply VDD provided by the battery of the e-cigarette terminal. The bias circuit mainly provides the start-up voltage to the first NMOS transistor MN1 through the comparator. One end of the fourth capacitor C4 is connected to the output of the bias circuit, and the other end of the fourth capacitor C4 is grounded through the second inductor L2. One end of the first inductor L1 is connected to the source of the first NMOS transistor MN1, and the other end of the first inductor L1 is connected between the fourth capacitor C4 and the second inductor L2. One end of the third capacitor C3 is connected to the positive terminal of the battery of the e-cigarette terminal, and the other end of the third capacitor C3 is connected between the fourth capacitor C4 and the second inductor L2. The first NMOS transistor can be a high-frequency MOS transistor to transfer electrical energy to the atomizing plate through the LC network, thereby accelerating the driving of the atomizing plate to reach the resonant state. Therefore, the resonant circuit is used to provide the frequency and voltage required to drive the atomizing plate to resonate, and the first NMOS transistor MN1 is used to control the generation and duration of the oscillation signal. The oscillation frequency is related to the capacitors and inductors included in the resonant circuit. Preferably, the oscillation frequency can be determined by the equivalent resistance of the first NMOS transistor MN1 in the on state and the time constant of the third capacitor C3.

[0055] Based on the foregoing embodiments, Figure 1 The working process and principle of the relevant circuits in the diagram are as follows:

[0056] The first step of the automatic drive circuit's operation is as follows: The battery of the electronic atomization terminal is turned on. A voltage signal is applied to the sources of switching PMOS transistors MP12 and MP11 through first resistor R1, second resistor R2, and third resistor R3. During the first preset working time counted by the timer, the output terminal B of the level switching unit outputs a high-level signal, which is applied to switching NMOS transistor MN22 and resistor R52, causing switching NMOS transistor MN22 to turn on. After switching NMOS transistor MN22 turns on, it pulls down the voltage applied to the gate of switching PMOS transistor MP12, causing switching PMOS transistor MP12 to turn on. The voltage signal output from the bias circuit is applied to the positive input terminal + of the comparator through switching PMOS transistor MP12, and the positive input terminal + of the comparator receives a high-level signal. While outputting a high-level signal from output B of the level switching unit, a low-level signal is simultaneously sent from output A of the level switching unit to the switching NMOS transistor MN21 and resistor R51, causing MN21 to turn off. After MN21 turns off, pull-up resistor R41 pulls the gate of switching PMOS transistor MP11 high, causing MP12 to turn off. The voltage signal output from the bias circuit cannot be applied to the negative input terminal - of the comparator through switching PMOS transistor MP12, and the negative input terminal - of the comparator remains low, considered as grounded. Therefore, the comparator... When the voltage at the negative input terminal (-) of the comparator is less than the voltage at the positive input terminal (+), the comparator outputs a high level and applies it to the gate of the first NMOS transistor MN1, turning on the first NMOS transistor MN1. Then, the second inductor L2, the first inductor L1, the third capacitor C3, and the fourth capacitor C4 generate corresponding driving voltage signals. These driving voltage signals are coupled back to the sixth resistor R6 through the first capacitor C1 to continuously control the first NMOS transistor MN1 to turn on, and are also fed back to the series branch formed by the first capacitor C1 and the atomizing plate. The resonant circuit starts to oscillate and drives the atomizing plate to resonate and atomize the e-liquid.

[0057] The second step of the automatic drive circuit's operation is as follows: Under the counting action of the timer, after the output terminal B of the level switching unit outputs a high-level signal for the first preset working time, during the second preset working time, the output terminal B of the level switching unit outputs a low-level signal, the NMOS transistor MN22 is turned off, and the pull-up resistor R42 pulls up the level at the gate of the PMOS transistor MP12, causing the PMOS transistor MP12 to turn off. The voltage signal output by the output terminal of the bias circuit cannot be applied to the positive input terminal + of the comparator through the PMOS transistor MP12, and the positive input terminal + of the comparator flips from high level to low level. Simultaneously, output terminal B of the level switching unit outputs a low-level signal, while output terminal A of the level switching unit outputs a high-level signal, which is applied to the switching NMOS transistor MN21 and resistor R51, causing the switching NMOS transistor MN21 to turn on. After the switching NMOS transistor MN21 turns on, the pull-up resistor R41 pulls down the gate of the switching PMOS transistor MP11 to a low level, causing the switching PMOS transistor MP11 to turn on. The voltage signal output from the output terminal of the bias circuit is applied to the negative input terminal - of the comparator through the switching PMOS transistor MP12. If the input terminal - is high, the voltage at the negative input terminal - of the comparator is greater than the voltage at the positive input terminal + of the comparator. The comparator outputs a low level and applies it to the gate of the first NMOS transistor MN1, turning off the first NMOS transistor MN1. This feedback is sent to the sixth resistor R6 to keep the first NMOS transistor MN1 off, and also to the series branch formed by the first capacitor C1 and the atomizing sheet. The resonant circuit stops working, thus controlling the atomizing sheet to stop resonating, thereby suppressing the temperature rise of the MOS transistor in the MOS transistor switching circuit.

[0058] The third step of the automatic drive circuit's operation is as follows: Under the counting action of the timer, after the output terminal B of the level switching unit outputs a low-level signal for a second preset working time, it enters a new first preset working time. During this time, the output terminal B of the level switching unit outputs a high-level signal, and the NMOS transistor MN22 turns on. After the NMOS transistor MN22 turns on, it pulls down the voltage applied to the gate of the PMOS transistor MP12, causing the PMOS transistor MP12 to turn on. The voltage signal output by the bias circuit is applied to the positive input terminal + of the comparator through the PMOS transistor MP12, and the positive input terminal + of the comparator flips from low level to high level. While outputting a high-level signal at output B of the level switching unit, outputting a low-level signal at output A of the level switching unit is applied to the switching NMOS transistor MN21 and resistor R51, turning off the switching NMOS transistor MN21. After the switching NMOS transistor MN21 is turned off, the pull-up resistor R41 pulls the gate of the switching PMOS transistor MP11 high, turning off the switching PMOS transistor MP12. The voltage signal output from the output of the bias circuit cannot be applied to the negative input terminal - of the comparator through the switching PMOS transistor MP12. The negative input terminal - of the comparator remains low, considered as grounded. Therefore, the negative input terminal - of the comparator outputs... When the input voltage is less than the positive input voltage of the comparator, the comparator outputs a high level and applies it to the gate of the first NMOS transistor MN1, turning on the first NMOS transistor MN1. Then, the second inductor L2, the first inductor L1, the third capacitor C3, and the fourth capacitor C4 generate corresponding drive voltage signals. These drive voltage signals are coupled back to the sixth resistor R6 through the first capacitor C1 to continuously control the first NMOS transistor MN1 to turn on, and are also fed back to the series branch formed by the first capacitor C1 and the atomizing plate. The resonant circuit re-drives the atomizing plate to resonate, and the automatic drive circuit repeats the first step of the working process.

[0059] The fourth step of the automatic drive circuit's operation is as follows: Under the counting action of the timer, after the output terminal B of the level switching unit outputs a high-level signal for a new first preset working time, it enters a new second preset working time. During this time, the output terminal B of the level switching unit outputs a low-level signal, the NMOS transistor MN22 is turned off, and the pull-up resistor R42 pulls up the level at the gate of the PMOS transistor MP12, causing the PMOS transistor MP12 to turn off. The voltage signal output by the output terminal of the bias circuit cannot be applied to the positive input terminal + of the comparator through the PMOS transistor MP12, and the positive input terminal + of the comparator flips from high level to low level. Simultaneously, output terminal B of the level switching unit outputs a low-level signal, while output terminal A of the level switching unit outputs a high-level signal, which is applied to the switching NMOS transistor MN21 and resistor R51, causing the switching NMOS transistor MN21 to turn on. After the switching NMOS transistor MN21 turns on, the pull-up resistor R41 pulls down the gate of the switching PMOS transistor MP11 to a low level, causing the switching PMOS transistor MP11 to turn on. The voltage signal output from the output terminal of the bias circuit is applied to the negative input terminal - of the comparator through the switching PMOS transistor MP12. If the negative input terminal is high, the voltage at the negative input terminal of the comparator is greater than the voltage at the positive input terminal of the comparator. The comparator outputs a low level, which is applied to the gate of the first NMOS transistor MN1, turning off MN1. This feedback is sent to the sixth resistor R6 to keep MN1 off, and also to the series branch formed by the first capacitor C1 and the atomizing plate. The resonant circuit controls the atomizing plate to stop resonating, thereby periodically suppressing the temperature rise of the MOS transistor in the MOS transistor switching circuit. The fourth step of the workflow is then considered as the automatic drive circuit repeating the second step. Therefore, the automatic drive circuit maintains this periodic mist output state by setting the first preset working time and the second preset working time, thus preventing overheating problems caused by abnormal working states such as dry burning, oil immersion, or short circuits, even without achieving constant power output of the atomizer in the electronic atomization terminal.

[0060] Preferably, if the automatic drive circuit is not working, the output terminals B and A of the level switching unit simultaneously output low-level signals. This turns off the NMOS transistor MN22, and the pull-up resistor R42 pulls up the gate level of the PMOS transistor MP12, causing MP12 to turn off. The voltage signal output from the bias circuit cannot be applied to the positive input terminal + of the comparator through MP12. Simultaneously, the NMOS transistor MN21 turns off. After MN21 turns off, the pull-up resistor R41 will apply a voltage to the switch... When the gate of PMOS transistor MP11 is pulled high, the switching PMOS transistor MP12 is turned off. The voltage signal output from the bias circuit cannot be applied to the negative input terminal - of the comparator through the switching PMOS transistor MP12. At this time, the voltage difference between the negative input terminal - and the positive input terminal + of the comparator is insufficient to cause the low-level signal originally held at the output terminal of the comparator to flip to a high-level signal. The first NMOS transistor MN1 is turned off, the resonant circuit stops working, and the resonant circuit stops driving the atomizing sheet to resonate, that is, the atomizing sheet stops continuing to atomize.

[0061] Based on the foregoing embodiments, an electronic atomization terminal is also disclosed, including the automatic driving circuit disclosed in any of the foregoing embodiments. Specifically, the automatic driving circuit uses a comparator to compare the output signals of two MOSFET switching circuits, and uses a timer to control a level switching unit to output different control signals in turn to periodically change the on / off state of the two MOSFET switching circuits. The comparator and the first MOSFET then feed back to the resonant circuit to drive the atomizing plate to oscillate and atomize the e-liquid or to drive the atomizing plate to stop oscillating, thereby changing the degree of atomization of the e-liquid. This achieves the atomization output of the atomizing plate increasing to no more than a preset upper limit value within a first preset working time and then decreasing to no less than a preset lower limit value within a second preset working time. The timing is then adjusted accordingly. Under the control of the device, the vapor output of the atomizing plate is adjusted to the expected range, realizing a time-division multiplexing method to alternately change the resonant working mode. This allows the MOSFET to dissipate the accumulated heat within a limited time, reducing the temperature of the MOSFET. Smokers do not need to constantly monitor the vapor state and current anomalies, and there is no need for high-precision analog-to-digital converters and excessive digital logic circuitry for real-time detection. This avoids automatically stopping operation only when abnormal states such as dry burning, oil immersion, or short circuits are detected, effectively preventing the aforementioned abnormalities during use of the electronic atomizing terminal. It also reduces battery consumption and the number of MOSFETs used. Furthermore, since the automatic drive circuit maintains a periodic vapor output state by setting the first and second preset working times, it can prevent overheating problems caused by abnormal working states such as dry burning, oil immersion, or short circuits even without achieving constant power output from the atomizer in the electronic atomizing terminal. Furthermore, when the suction sensor detects that the airflow value is lower than the preset airflow threshold, no suction action signal is generated. Instead, the level switching unit is triggered to control the atomizing plate to stop resonating by changing the control signal output by each output terminal. This allows the amount of smoke supplied to reach the expected range during the interval of the user's suction action, reducing the user's smoke intake and improving the safety and service life of the electronic atomizing terminal to a certain extent.

[0062] In some embodiments, the electronic atomization terminal includes a vaporizer and a cartridge. The automatic drive circuit is disposed within the vaporizer, and the suction sensor is also disposed within the vaporizer, particularly on the mouthpiece side, for detecting airflow changes in the vapor produced by the atomizing plate and feeding back the airflow value, which can be represented by electrical quantity and then converted into vapor volume (the amount of vapor retained within the vaporizer). The suction sensor can detect airflow information from the non-mouthpiece side of the vaporizer towards the mouthpiece side. The suction sensor can be an airflow sensor with a simple built-in resistance or capacitance detection circuit, without requiring a multi-bit analog-to-digital converter and amplifier. The atomizing plate is disposed within the cartridge, upstream of the cartridge, in the flow path of the gas inhaled from the mouthpiece side (the flow path of the vapor produced by the atomizing plate, which can be the flow path from the non-mouthpiece side towards the mouthpiece side). The suction sensor can also be a MEMS (MicroElectroMechanical Systems) sensor with a capacitor, outputting a value representing the capacitance (e.g., voltage) of the capacitor corresponding to the pressure difference generated within the flow path by the inhalation action. The output value can be identified as pressure, as well as flow rate and velocity per unit time.

[0063] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

Claims

1. An automatic drive circuit for an electronic atomizing terminal, characterized in that, The automatic drive circuit includes a bias circuit, a resonant circuit, a coupling circuit, a level switching unit, two MOS transistor switching circuits, a comparator, and a first NMOS transistor; The resonant circuit is connected to the atomizing plate via a coupling circuit; each MOS transistor switching circuit is connected to the output of the bias circuit, the control terminal of each MOS transistor switching circuit is connected to one output of the level switching unit, the output of each MOS transistor switching circuit is connected to one input of the comparator, the output of the comparator is connected to the gate of the first NMOS transistor, and the source of the first NMOS transistor is connected to the resonant circuit; the drain of the first NMOS transistor and the bias circuit are both connected to the battery of the electronic atomization terminal. The automatic drive circuit further includes a timer; the timer is connected to the comparator; the timer is also connected to the level switching unit. The level switching unit is used to drive the resonant circuit to start oscillating by changing the control signal output by each output terminal during a first preset working time of timer counting; and then to control the resonant circuit to stop generating oscillation signals by changing the control signal output by each output terminal during a second preset working time of timer counting.

2. The automatic drive circuit according to claim 1, characterized in that, The automatic drive circuit also includes an attraction sensor, which is connected to the level switching unit. The suction sensor is used to determine whether there is a suction action by detecting changes in airflow. When the suction sensor detects that the change in airflow value is lower than a preset airflow threshold, there is no suction action. The suction sensor then generates a non-suction action signal and inputs it to the level switching unit. The level switching unit then controls the resonant circuit to stop generating oscillation signals by changing the control signal output by each output terminal.

3. The automatic drive circuit according to claim 2, characterized in that, During the period when the timer counts each of the first preset working times, the MOS transistor switching circuit connected to the positive input terminal of the comparator is turned on by the control signal output by the output terminal of the level switching unit, and the MOS transistor switching circuit connected to the negative input terminal of the comparator is turned off by the control signal output by the output terminal of the level switching unit. The signal output by the comparator turns on the first NMOS transistor, so that the resonant circuit starts to oscillate. During the period when the timer counts each of the second preset working times or during the period when the attraction sensor does not generate a suction action signal, the MOS transistor switching circuit connected to the positive input terminal of the comparator is turned off by the control signal output by the output terminal of the level switching unit, and the MOS transistor switching circuit connected to the negative input terminal of the comparator is turned on by the control signal output by the output terminal of the level switching unit. The control signal output by the comparator turns off the first NMOS transistor, so that the resonant circuit stops generating an oscillation signal.

4. The automatic drive circuit according to claim 3, characterized in that, The level switching unit includes a first selector and a second selector; the level switching unit is internally provided with two different control signals, which are respectively input to the two input terminals of the first selector and the two different control signals are respectively input to the two input terminals of the second selector. The level switching unit is provided with a first output terminal and a second output terminal. The output terminal of the first selector is the first output terminal, and the output terminal of the second selector is the second output terminal. The timer's count output terminal is connected to the selection control terminal of the first selector, and the timer's count output terminal is also connected to the selection control terminal of the second selector; A timer is used to first output a first counting flag signal to the level switching unit after counting a first preset working time, then output a second counting flag signal to the level switching unit after counting a second preset working time, and then count the first preset working time, and so on, counting the first preset working time and the second preset working time in turn. Whenever the selection control terminal of the first selector receives the first counting flag signal, the first selector selects and outputs a control signal that is different from the control signal output by the first output terminal within a first preset working time; whenever the selection control terminal of the second selector receives the first counting flag signal, the second selector selects and outputs a control signal that is different from the control signal output by the second output terminal within a first preset working time. Whenever the selection control terminal of the first selector receives the second counting flag signal, the first selector selects and outputs a control signal that is different from the control signal output by the first output terminal within a second preset working time. Whenever the selection control terminal of the second selector receives the second counting flag signal, the second selector selects and outputs a control signal that is different from the control signal output by the second output terminal within a second preset working time.

5. The automatic drive circuit according to claim 4, characterized in that, The first preset working time is a counting time determined to ensure that the amount of mist emitted by the atomizing plate does not exceed the upper limit of the expected range; the second preset working time is a counting time determined to ensure that the amount of mist emitted by the atomizing plate is not lower than the lower limit of the expected range; the first preset working time is set to be greater than the second preset working time. The automatic drive circuit first triggers the resonant circuit to start working within a first preset working time, and then stops working within a second preset working time. The automatic drive circuit first triggers the resonant circuit to stop working within a second preset working time, and then starts working within a first preset working time.

6. The automatic drive circuit according to claim 1, characterized in that, Each MOSFET switching circuit includes a switching PMOS transistor, a pull-up resistor, a switching NMOS transistor, and a pull-down resistor; The source of the switching PMOS transistor is connected to the output of the bias circuit, the source of the switching PMOS transistor is connected to one end of the pull-up resistor, the gate of the switching PMOS transistor is connected to the other end of the pull-up resistor, and the drain of the switching PMOS transistor is connected to one input of the comparator. The gate of the PMOS transistor is connected to the drain of the NMOS transistor. The gate of the NMOS transistor is connected to one end of the pull-down resistor. The source of the NMOS transistor and the other end of the pull-down resistor are both grounded. The gate of the NMOS transistor is connected to one output terminal of the level switching unit. The gate of the NMOS transistor is the control terminal of the MOS transistor switching circuit, and the drain of the PMOS transistor is the output terminal of the MOS transistor switching circuit.

7. The automatic drive circuit according to claim 6, characterized in that, When the control signals output from the two output terminals of the level switching unit are different, the gate input voltage of the switching NMOS transistor included in each MOS transistor switching circuit is different, and therefore the drain output voltage of the switching PMOS transistor included in each MOS transistor switching circuit is different.

8. The automatic drive circuit according to claim 6, characterized in that, The bias circuit includes a first resistor, a second resistor, and a third resistor; The coupling circuit includes a first capacitor, a second capacitor, and a sixth resistor; The resonant circuit includes a third capacitor, a fourth capacitor, a first inductor, and a second inductor. One end of the first resistor is connected to the positive terminal of the battery of the electronic atomization terminal, the other end of the first resistor is grounded through the second resistor, the other end of the first resistor is connected to one end of the third resistor, and the other end of the third resistor is configured as the output terminal of the bias circuit. The first capacitor and the atomizing plate are connected in series to form a branch. One end of the series branch is connected to the positive terminal of the battery of the electronic atomizing terminal, and the other end of the series branch is connected to the output terminal of the bias circuit. One end of the second capacitor is connected to the positive terminal of the battery of the electronic atomizing terminal, and the other end of the second capacitor is connected to one end of the sixth resistor. The other end of the sixth resistor is connected to the output terminal of the bias circuit. One end of the fourth capacitor is connected to the output terminal of the bias circuit, and the other end of the fourth capacitor is grounded through the second inductor. One end of the first inductor is connected to the source of the first NMOS transistor, and the other end of the first inductor is connected between the fourth capacitor and the second inductor. One end of the third capacitor is connected to the positive terminal of the battery of the electronic atomization terminal, and the other end of the third capacitor is connected between the fourth capacitor and the second inductor. The positive power supply terminal of the comparator is connected to the positive terminal of the battery of the electronic atomization terminal, and the negative power supply terminal of the comparator is grounded; the positive input terminal of the comparator is connected to the drain of the switching PMOS transistor included in one of the MOS transistor switching circuits, and the negative input terminal of the comparator is connected to the drain of the switching PMOS transistor included in another MOS transistor switching circuit.

9. An electronic atomizing terminal, characterized in that, Includes the automatic drive circuit as described in any one of claims 1 to 8.

10. The electronic atomizing terminal according to claim 9, characterized in that, The electronic atomization terminal includes a vaporizer and a cartridge. The automatic drive circuit is located inside the vaporizer, and the atomizing plate is located inside the cartridge. The e-liquid in the electronic atomization terminal is the raw material for generating vapor.

Images