Control circuit for electronic cigarette atomizer and electronic atomizer terminal

Abstract

The present application discloses a control circuit for an electronic cigarette atomizer and an electronic atomizer terminal. The control circuit includes a bias circuit, an oscillator circuit, a coupling circuit, a level output unit, two MOS transistor switch circuits, a comparator, and a first NMOS transistor. The oscillator circuit is connected to the atomizer through the bias circuit and the coupling circuit in sequence. The source of the PMOS transistor in each MOS transistor switch circuit is connected to the output end of the bias circuit, the gate of the NMOS transistor in each MOS transistor switch circuit is respectively connected to an output end of the level output unit, the drain of the PMOS transistor in each MOS transistor switch circuit is respectively connected to an input end of the comparator, the output end 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 oscillator circuit. The control circuit also includes a timer. Whenever the timer counts a first preset working time, the level output unit changes the control signal output by each output end.

Description

Technical Field

[0001] The present invention relates to the technical field of atomization control circuits, and in particular to a control circuit for an electronic cigarette atomizer and an electronic atomization terminal. Background Art

[0002] An electronic cigarette is an electronic device that simulates the operation of a traditional cigarette. The atomizer vaporizes the e-liquid (nicotine, propylene glycol, glycerin, flavoring, and other ingredients) stored in the atomizer, simulating the smoke produced by smoking. The flavorings simulate the taste of cigarettes while also satisfying smokers' nicotine intake needs. The e-liquid in the e-cigarette is the raw material for smoke production. The e-liquid is introduced from the oil reservoir onto the surface of the atomizer by means of a liquid guide. As the core component of an e-cigarette, the stable and proper functioning of the atomizer depends on its working condition. When the oil leaks from the oil storage chamber or the oil guide cotton malfunctions, causing the oil guide speed to be too fast, a large amount of oil accumulates on the surface of the atomizer, and the atomizer is in a bubble state. The smoker's intuitive feeling is that the smoke is very small and there is oil splashing. At this time, the vibration friction loss on the surface of the atomizer increases, which increases the energy required for resonance. Therefore, the input current of the resonant drive module (the drive circuit used to control the resonant operation of the atomizer) in the electronic cigarette is greater than the current during normal operation. The temperature of the switching device (such as transistor or MOS tube) in the resonant drive module rises very high in a short period of time to its limit temperature, and will remain in an over-high temperature working state for a long time. The switching device may not work normally due to excessive driving voltage, and the power module needs to be manually shut down frequently. Summary of the Invention

[0003] This application discloses a control circuit for an electronic cigarette atomizer and an electronic atomizer terminal. The disclosed technical solutions are as follows:

[0004] A control circuit for an electronic cigarette atomizer, comprising a bias circuit, an oscillator circuit, a coupling circuit, a level output unit, two MOS tube switch circuits, a comparator, and a first NMOS tube; the oscillator circuit is sequentially connected to the atomizer through the bias circuit and the coupling circuit; the source of the PMOS tube in each MOS tube switch circuit is connected to the output end of the bias circuit, the gate of the NMOS tube in each MOS tube switch circuit is respectively connected to an output end of the level output unit, the drain of the PMOS tube in each MOS tube switch circuit is respectively connected to an input end of the comparator, the output end of the comparator is connected to the gate of the first NMOS tube, and the source of the first NMOS tube is connected to the oscillator circuit; wherein the drain of the first NMOS tube and the bias circuit are both connected to a battery.

[0005] Furthermore, the control circuit also includes a timer; the timer is connected to the comparator; the timer is used to time the signal output by the comparator; the timer is connected to the level output unit; the level output unit is used to change the control signal output by each output end of the level output unit each time the timer counts the first preset working time, so as to periodically change the working state of the oscillation circuit.

[0006] Furthermore, when the MOS transistor switch circuit connected to the positive input end of the comparator is turned on by the control signal output by the output end of the level output unit, the MOS transistor switch circuit connected to the negative input end of the comparator is turned off by the control signal output by the output end of the level output unit, and the signal output by the comparator turns on the first NMOS transistor, so that the oscillation circuit drives the atomizer plate to resonate; when the MOS transistor switch circuit connected to the positive input end of the comparator is turned off by the control signal output by the output end of the level output unit, the MOS transistor switch circuit connected to the negative input end of the comparator is turned on by the control signal output by the output end of the level output unit, and the control signal output by the comparator turns off the first NMOS transistor, so that the atomizer plate stops resonating.

[0007] Furthermore, the level output unit includes a first selector and a second selector; two different control signals are provided inside the level output unit, the two different control signals are respectively input into the two input ends of the first selector, and the two different control signals are respectively input into the two input ends of the second selector; the level output unit is provided with a first output end and a second output end, the output end of the first selector is the first output end, and the output end of the second selector is the second output end; the counting output end of the timer is connected to the selection control end of the first selector, and the counting output end of the timer is also connected to the selection control end of the second selector; the timer is configured to output a counting flag signal to the level output unit each time a first preset working time is counted; when the selection control end of the first selector receives the counting flag signal, the first selector selects to output a control signal different from the control signal output by the first output end during the previous first preset working time, and controls the currently selected control signal to remain unchanged during the current first preset working time; when the selection control end of the second selector receives the counting flag signal, the second selector selects to output a control signal different from the control signal output by the second output end during the previous first preset working time, and controls the currently selected control signal to remain unchanged during the current first preset working time.

[0008] Furthermore, the first preset working time is a counting time determined to ensure that the amount of mist emitted by the atomizer does not exceed the upper limit of an expected range; the control circuit successively triggers the atomizer to start and stop resonance within two adjacent first preset working times, or triggers the atomizer to stop resonance and start resonance again within two adjacent first preset working times.

[0009] Furthermore, each MOS transistor switch circuit includes a switch PMOS transistor, a pull-up resistor, a switch NMOS transistor, and a pull-down resistor; the source of the switch PMOS transistor is connected to the output end of the bias circuit, the source of the switch PMOS transistor is connected to one end of the pull-up resistor, the gate of the switch PMOS transistor is connected to the other end of the pull-up resistor, and the drain of the switch PMOS transistor is connected to an input end of the comparator; the gate of the switch PMOS transistor is connected to the drain of the switch NMOS transistor, the gate of the switch NMOS transistor is connected to one end of the pull-down resistor, the source of the switch NMOS transistor and the other end of the pull-down resistor are both grounded, and the gate of the switch NMOS transistor is connected to an output end of the level output unit.

[0010] Furthermore, when the control signals output by the two output terminals of the level output unit are different, the gate input voltages of the switch NMOS tube included in each MOS tube switch circuit are different, and the drain output voltages of the switch PMOS tube included in each MOS tube switch circuit are different.

[0011] Furthermore, the bias circuit includes a first resistor, a second resistor and a third resistor; the coupling circuit includes a first capacitor and a second capacitor; the oscillation 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 electrode of the battery, 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 end of the bias circuit; the first capacitor and the atomizer are connected to form a series branch, one end of the series branch is connected to the positive electrode of the battery, the other end of the series branch is connected to the output end of the bias circuit, one end of the second capacitor is connected to the positive electrode of the battery, and the other end of the second capacitor is connected to the output end of the bias circuit; one end of the fourth capacitor is connected to the The output end of the bias circuit is connected, 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, 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 electrode of the battery, and the other end of the third capacitor is connected between the fourth capacitor and the second inductor; the positive power supply end of the comparator is connected to the positive electrode of the battery, the output end of the comparator is connected to the positive power supply end of the comparator through the feedback resistor, and the negative power supply end of the comparator is grounded; the positive input end of the comparator is connected to the drain of the switch PMOS transistor included in one of the MOS transistor switch circuits, and the negative input end of the comparator is connected to the drain of the switch PMOS transistor included in the other MOS transistor switch circuit.

[0012] An electronic atomization terminal comprises the control circuit.

[0013] Furthermore, the electronic atomization terminal includes a cigarette rod and a cigarette cartridge, the control circuit is arranged in the cigarette rod, and the atomization sheet is arranged in the cigarette cartridge, wherein the cigarette oil in the electronic atomization terminal is the raw material for generating smoke.

[0014] The technical effects of this application are:

[0015] The two MOS transistor switch circuits disclosed in the present application obtain a control signal for controlling the periodic on-off of the first NMOS transistor through a comparator to control the periodic generation of an oscillation signal without maintaining the continuous generation of the oscillation signal, thereby controlling the periodic on-off of the atomizer plate in the electronic cigarette and automatically controlling the amount of mist output from the atomizer plate. The present application uses a comparator to reflect the voltage changes transmitted by the two MOS transistor switch circuits. The frequency information and voltage information currently required to start or stop oscillation are fed back to the oscillation circuit through the first NMOS transistor. The voltage information fed back to the oscillation circuit is the comparison result between the voltage signals transmitted by the two MOS transistor switch circuits. Under the control of the voltage switched output by the two output ends of the level output unit, the two MOS transistor switch circuits are supported to work in a regular alternating manner. The result output by the comparator controls the periodic on-off of the first NMOS transistor, allowing the oscillation circuit to automatically pause generating the oscillation signal, sacrificing the user's experience of inhaling smoke to reduce the problem of the first NMOS transistor's temperature continuously rising.

[0016] In the present application, the control circuit also includes a timer, which is used to time the pulse signal or constant control signal output by the comparator; the level output unit is used to flip the output control signal of each output end of the level output unit whenever the timer counts the first preset working time, so as to cyclically switch the on-off status of the MOS tube in the two MOS tube switch circuits, and then the comparator and the first MOS tube are fed back to the oscillation circuit, so that the amount of mist output of the atomizer is adjusted under the control of the level output unit and the timer, reducing power consumption and processing load. In addition, the control circuit maintains this periodic mist output working state by setting the first preset working time, which can allow the relevant MOS tube to dissipate heat within the limited time of disconnection, and can also prompt the user to check for abnormal working conditions such as dry burning, oil bubbling or short circuit, so as to avoid automatically stopping work when abnormal conditions such as dry burning, oil bubbling or short circuit are detected, reducing the user's smoke intake, and to a certain extent improving the safety of the terminal equipment equipped with the atomizer, the smoking cessation effect and service life of the electronic cigarette. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic structural diagram of a control circuit for an electronic cigarette atomizer according to an embodiment. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are further described below with reference to the accompanying drawings. In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0019] The tobacco oil in electronic cigarettes or other electronic atomization terminals is the raw material for generating smoke. The tobacco oil on the surface of the atomizer is introduced from the oil storage chamber by the oil guide cotton. As the core component of the high-frequency ultrasonic atomizer, whether the electronic atomization terminal can work stably and normally depends on the working state of the atomizer, that is, whether the atomizer can stably and normally atomize the tobacco oil guided to its surface. The atomizer can be composed of an electrode sheet. After a high-frequency voltage signal is applied by an external circuit, a surface elastic wave is generated to atomize the tobacco oil and other liquids on the surface. When the electronic atomization terminal continues to work under high temperature, dry burning, oil soaking or short circuit phenomena are prone to occur. Then the electronic devices inside the electronic atomization terminal cannot work properly, and in serious cases, the working circuit may be burned. Although the existing ultrasonic electronic atomization terminal working control circuit has the function of driving the atomizer to work, it is necessary to manually disconnect the power module frequently to reduce the frequency of abnormalities in the atomization drive circuit, or to set up an additional heat dissipation device (heat sink or fan) to maintain the normal performance of the electronic devices.

[0020] In response to the above technical deficiencies, this embodiment discloses a control circuit for an electronic cigarette atomizer. The control circuit includes a bias circuit, an oscillating circuit, a coupling circuit, a level output unit, two MOS transistor switch circuits, a comparator, and a first NMOS transistor. The two MOS transistor switch circuits correspond to Figure 1 The first MOS tube switching circuit and the second MOS tube switching circuit, the first NMOS tube is Figure 1 The MN1 oscillation circuit shown is actually a resonant frequency selection circuit. Figure 1As can be seen, the oscillator circuit is connected to the atomizer via a bias circuit and a coupling circuit. The source of the PMOS transistor in each MOS switch circuit is connected to the output of the bias circuit, so that the same bias circuit provides a bias voltage signal for the MOS transistor in each MOS switch circuit that functions as a pull-up driver. The gate of the NMOS transistor in each MOS switch circuit is connected to an output of a level output unit, so that each output of the level output unit controls the on / off switching of the MOS transistor in the corresponding MOS switch circuit that functions as a pull-down driver. The drain of the PMOS transistor in each MOS switch circuit is connected to an input of a comparator, and the output of the comparator is connected to the gate of the first NMOS transistor. The comparator's output signal is the result of a comparison between the output voltages of the two MOS switch circuits, reflecting the on / off status of the two MOS switch circuits. The comparator output has only two states: low and high. Therefore, the integrated operational amplifier within it often operates in a nonlinear region, allowing it to output a pulse signal with a frequency or maintain a constant level. When both MOS transistor switching circuits are on or off, the comparator outputs a low control signal (with a minimum voltage of 0V). When the MOS transistor switching circuit connected to the positive input of the comparator is on and the MOS transistor switching circuit connected to the negative input of the comparator is off, the comparator outputs a high control signal (with a maximum voltage reaching VDD), and the signal output by the comparator has a certain frequency. When the MOS transistor switching circuit connected to the negative input of the comparator is on and the MOS transistor switching circuit connected to the positive input of the comparator is off, the comparator outputs a low control signal (with a minimum voltage of 0V), and the signal output by the comparator has a certain frequency. The source of the first NMOS transistor MN1 is connected to the oscillation circuit, providing the oscillation circuit with the voltage and frequency required to drive the atomizer. The drain of the first NMOS transistor MN1 and the bias circuit are both connected to a battery (which can be an electronic cigarette battery, such as a lithium-ion battery), that is, connected to VDD. The electronic cigarette battery generally provides a voltage of 3.3 to 8.2V, corresponding to VDD, which can power the control circuit. This constitutes the frequency and voltage supply source for the operation of the atomizer, that is, the driving frequency and driving voltage are provided to the atomizer based on the on and off action of each MOS tube switch circuit.On the basis of the connection relationship disclosed above, the two MOS transistor switch circuits disclosed in this embodiment obtain a control signal for controlling the periodic on and off of the first NMOS transistor through a comparator to control the periodic generation of the oscillation signal without maintaining the continuous generation of the oscillation signal, thereby controlling the periodic on and off of the atomizer in the electronic cigarette. This can automatically control the amount of mist output from the atomizer, allowing the oscillation circuit to automatically pause the generation of the oscillation signal, and promptly dissipate the heat of the MOS transistor and the first NMOS transistor in the currently turned-off MOS transistor switch circuit, reducing the problem of continuous temperature increase and voltage overshoot of the MOS transistor, and extending the service life of the electronic cigarette or other electronic atomization terminals.

[0021] On the basis of the above embodiment, the control circuit further includes a timer, which can be a 555 timer to achieve a steady-state output count value; Figure 1 As shown, a timer is connected to the comparator. In some embodiments, a count input of the timer is connected to the output of the comparator. The count input of the timer can be a data input or a clock input of a register constituting the timer, so as to detect the pulse width information of the output signal of the comparator according to the system clock cycle. The timer is used to time the signal output by the comparator. An implementation includes counting the level width or the width of two adjacent edges of the constant-level signal output by the comparator according to a predetermined clock cycle to implement beat counting processing of the pulse signal or constant-level signal output by the comparator until the counting time reaches a first preset working time.

[0022] When the timer count value represents the duration that the comparator maintains outputting a signal at the same level, the duration that the comparator maintains outputting a high-level signal corresponds to the period during which all MOS transistors in the MOS transistor switching circuit remain on (the period during which the MOS transistor switching circuit remains connected); the duration that the timer maintains outputting a low-level signal corresponds to the period during which the MOS transistors in the MOS transistor switching circuit remain off (the period during which the MOS transistor switching circuit remains off). The signal output by the comparator can have a specific frequency and voltage. 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 signal output by the comparator, in addition to controlling the on / off state of the first NMOS transistor, provides the oscillator circuit with the frequency and voltage to drive the atomizer.

[0023] The timer is connected to the level output unit. In some embodiments, the count output terminal of the timer is connected to the selection control terminal of the level output unit. The count output terminal of the timer is used to output a count result, including timing information of a continuously output high-level signal (i.e., the time period during which the MOS transistor switch circuit remains on) or timing information of a continuously output low-level signal (i.e., the time period during which the MOS transistor switch circuit remains off), or the sum of the two. The count result output by the count output terminal of the timer serves as a selection condition or trigger signal for the level output unit to output a corresponding level signal, thereby controlling each output terminal of the level output unit to periodically change the on-off state of the corresponding MOS transistor switch circuit. In this embodiment, the level output unit is configured to change the control signal output by each output terminal of the level output unit each time the timer counts a first preset operating time, thereby periodically changing the operating state of the oscillator circuit. The level output unit is internally provided with a multiplexer to select and output a corresponding level signal each time the first preset operating time has elapsed, or an inverter to invert the currently output control signal after the first preset operating time has elapsed, thereby changing the on-off state of the corresponding MOS transistor switch circuit. In this embodiment, the first preset operating time can be configured as a time period that limits the amount of e-liquid evaporated from the atomizer. Maintaining this intermittent misting state by setting the first preset operating time allows the relevant MOS tube to dissipate heat within the limited time it is disconnected. This can prompt the user to check for abnormal operating conditions such as dry burning, e-liquid soaking, or a short circuit, thereby reducing the user's smoke intake and, to a certain extent, improving the safety of the e-cigarette or the atomizer terminal equipped with the aforementioned control circuit, as well as the smoking cessation effect and service life of the e-cigarette.

[0024] Specifically, the control circuit operates in the first step as follows: when the MOS transistor switch circuit connected to the positive input of the comparator is turned on by the control signal output from the output of the level output unit, the MOS transistor switch circuit connected to the negative input of the comparator is turned off by the control signal output from the output of the level output unit. The control signal that turns on the MOS transistor switch circuit connected to the positive input of the comparator is a high-level signal, while the control signal that turns off the MOS transistor switch circuit connected to the negative input of the comparator is a low-level signal. Then, the comparator outputs a high-level signal with a frequency, turning on the first NMOS transistor MN1. Corresponding voltage signals are generated across the inductor and capacitor within the oscillation circuit, causing the oscillation circuit to drive the atomizer to resonate. These voltage signals are fed back to the output of the bias circuit to continuously control the switching of the first NMOS transistor MN1 until the first preset operating time has elapsed. Then, the first NMOS transistor MN1 is turned off by the corresponding control signal output from the output of the level output unit, thereby stopping the oscillation circuit from driving the atomizer to resonate. The control signals simultaneously outputted from the two output terminals of the level output unit are respectively a control signal for turning off the MOS transistor switch circuit and a control signal for turning on the MOS transistor switch circuit.

[0025] The second step of the control circuit's working process: when the MOS transistor switch circuit connected to the positive input of the comparator is turned off by the control signal output from the output of the level output unit, the MOS transistor switch circuit connected to the negative input of the comparator is turned on by the control signal output from the output of the level output unit. At this time, the control signal for turning on the MOS transistor switch circuit connected to the negative input of the comparator is a high-level signal, and the control signal for turning off the MOS transistor switch circuit connected to the positive input of the comparator is a low-level signal. Then, the signal output by the comparator is a low-level signal, turning off the first NMOS transistor MN1, and then being unable to provide the driving voltage and driving frequency to the oscillation circuit, so that the atomizer stops resonating until the first preset working time has passed and then the atomizer stops resonating at the input of the level output unit. The output end is controlled by a control signal corresponding to the adjustment output, and the first NMOS transistor MN1 is turned on. The process returns to the first step, and the cycle is repeated to cyclically switch the on-off status of the MOS transistors in the two MOS transistor switch circuits. The comparator and the first MOS transistor then provide feedback to the oscillation circuit to adjust the amount of mist output from the atomizer, suppress the temperature rise of the MOS transistor in the MOS transistor switch circuit, and avoid automatically stopping the operation upon detecting abnormal conditions such as dry burning, oil bubbling, or short circuit. Instead, the first preset working time is set to maintain this periodic mist output working state, which allows the relevant MOS transistor to dissipate heat within the limited time of disconnection, and can also prompt the user to check for abnormal working conditions such as dry burning, oil bubbling, or short circuit, thereby reducing the user's smoke intake and improving the safety, smoking cessation effect, and service life of the electronic cigarette to a certain extent.

[0026] As an embodiment, the level output unit includes a first selector and a second selector; two different control signals are set inside the level output unit, and the two different control signals are respectively input into the two input ends of the first selector, and the two different control signals are respectively input into the two input ends of the second selector; Figure 1As shown, the level output 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 count output terminal of the timer is connected to the selection control terminal of the first selector, and the count output terminal of the timer is also connected to the selection control terminal of the second selector. The first and second selectors are both controlled by the same timer and synchronously select and output corresponding control signals, so that the signal output by the comparator promptly changes the on-off state of the first NMOS transistor. Specifically, the level output unit is internally 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 select and 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 select and output. The first control signal is the control signal for turning off the MOS transistor switch circuit, and the second control signal is the control signal for turning on the MOS transistor switch circuit; alternatively, the second control signal is the control signal for turning off the MOS transistor switch circuit, and the first control signal is the control signal for turning on the MOS transistor switch 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 working state changes of the two MOS transistor switch circuits.

[0027] The timer is used to output a counting mark signal to the level output unit each time the first preset working time is counted. The signal can be a high-level signal, indicating that the timing operation of the output signal of the comparator or the signal output from the output end of the comparator within a preset working cycle is completed. The level width of the constant level signal output by the comparator or the counting change value corresponding to a certain working cycle can be obtained. When the comparator outputs a pulse signal with a certain frequency, a preset number of pulse signals will be output in sequence within the first preset working time. The preset number is the ratio of the first preset working time to the clock cycle of the clock signal connected to the timer. On this basis, when the selection control end of the first selector receives the counting flag signal, the first selector selects to output a control signal different from the control signal currently output by the first output end, that is, the first output end outputs a control signal different from the control signal output during the previous first preset working time during the current first preset working time. For example, the first control signal output during the previous first preset working time is switched to the second control signal, which is output by the first output end during the current first preset working time, thereby changing the on-off state of the MOS transistor switch circuit connected to the first output end and maintaining the on-off state during the current first preset working time. When the selection control end of the second selector receives the counting flag signal, the second selector selects to output a control signal different from the control signal currently output by the second output end, that is, the second output end outputs a control signal different from the control signal output during the next first preset working time during the previous first preset working time. For example, the second control signal output during the previous first preset working time is switched to the first control signal, which is output by the second output end during the current first preset working time, thereby changing the on-off state of the MOS transistor switch circuit connected to the second output end and maintaining the latest output control signal unchanged during the current first preset working time.

[0028] In order to periodically change the working state of the oscillation circuit (intermittently control the mist output of the atomizer, for example, first increase and then stop, or first stop and then increase, and adjust in a reciprocating cycle), the implementation method of the level output unit is equivalent to: every first preset working time, the control signal currently output to turn off the MOS tube switch circuit is flipped (the signal currently selected by the selector can be inverted) to a control signal to turn on the MOS tube switch circuit and transmit it to a connected MOS tube switch circuit, and the control signal currently output to turn on the MOS tube switch circuit is flipped (the signal currently selected by the selector can be inverted) to a control signal to turn off the MOS tube switch circuit and transmit it to another connected MOS tube switch circuit.

[0029] It should be noted that the aforementioned selector is a combinational logic circuit, which is formed by a series of AND gate circuits, OR gate circuits and NOT gate circuits connected according to a two-choose-one logic; the aforementioned timer can be composed of a shift register, or a register and a gate logic circuit.

[0030] In the aforementioned embodiment, the first preset operating time is a count time determined to ensure that the atomizer plate's mist output does not exceed the upper limit of a desired range. Therefore, the control circuit sequentially triggers the atomizer plate to start and stop resonating within two consecutive first preset operating times, or to stop and restart resonating within two consecutive first preset operating times. The control circuit is located within an electronic cigarette or other electronic atomization terminal. Cigarette oil is the raw material for generating smoke, and atomization here refers to the process of dispersing liquid into tiny droplets to form an aerosol. The atomizer plate's mist output is the supply of aerosol formed by atomized cigarette oil, i.e., the amount of smoke generated by the atomizer plate's oscillation. To balance the convenience of count adjustment with effective cooling and heat dissipation, this embodiment sets both the time it takes to drive the atomizer plate to resonate and the time it takes to stop resonating to the first preset operating time. This prevents poor heat dissipation of the associated MOS tubes due to the atomizer plate stopping resonating time being set shorter than the atomizer plate resonating time, while also preventing the atomizer plate stopping resonating time from being set longer than the atomizer plate resonating time to avoid excessively long intervals. 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 aforementioned expected range can be determined based on the upper and lower limits, preferably the lower limit is above 0.1 mg, and more preferably above 1.0 mg. On the other hand, the upper limit of the expected range is preferably below 10.0 mg, and more preferably below 5.0 mg and above 3.0 mg. In addition, the expected range can be determined based on the target value of the mist output, for example, based on the target value of the mist output, in the range of less than ±50% (for example, when the target value of the mist output is regarded as 2.0 mg, the expected range is more than 1.0 mg and less than 3.0 mg), and more preferably in the range of less than ±25% (for example, when the target value of the mist output is regarded as 2.0 mg, the expected range is more than 1.5 mg and less than 2.5 mg).

[0031] Therefore, in some embodiments, during the first first preset working time counted by the timer, the first NMOS transistor MN1 is turned on to provide a driving voltage and a driving frequency to the oscillation circuit, thereby driving the atomizer plate to resonate; when the timer finishes counting the second first preset working time and starts counting the second first preset working time, the first NMOS transistor MN1 is turned off after being turned on for one first preset working time, and stops providing the driving voltage and the driving frequency to the oscillation circuit. Therefore, during the second first preset working time, the temperature of the atomizer plate and the turned-off MOS transistor will decrease, and the amount of mist output from the atomizer plate will gradually decrease, which may decrease to the lower limit of the expected range, or the existing amount of mist output may decrease to below the lower limit of the expected range due to condensation of smoke in the flow path of the smoke or aerosol; after the second first preset working time, the control circuit After that, the first NMOS tube MN1 is turned on again, and the driving voltage and driving frequency are provided to the oscillation circuit again, driving the atomizer plate to start resonating again, thereby suppressing the mist output from becoming too low, for example, below the lower limit of the expected range, and automatically adjusting the mist output of the atomizer plate to ensure the user's basic smoking experience. In the process of repeatedly turning on and off the first NMOS tube MN1, it can be achieved that when the mist output of the atomizer plate exceeds the lower limit of the expected range and then increases or decreases within the expected range, the state of the mist output of the atomizer plate being higher than the lower limit of the expected range will be maintained or the state of not being higher than the upper limit of the expected range will be maintained. Of course, when the first preset working time is configured as the time interval of the user's puffing action, the control circuit can automatically adjust the mist output of the atomizer plate to be within the expected range or to float near the upper and lower limits of the expected range through the interval of the puffing action. In summary, the control circuit disclosed in this embodiment repeatedly drives the atomizer plate to start and stop resonance, or stop resonance and start resonance again, based on the two adjacent first preset working times that can be counted by the timer, so that the supply of smoke converges within the expected range, so that the temperature of the atomizer plate and the disconnected MOS tube is suppressed. Therefore, the control circuit maintains this periodic mist-discharging working state by setting the first preset working time, which can allow the relevant MOS tube to dissipate heat within the limited time of disconnection, and can also prompt the user to check for abnormal working conditions such as dry burning, oil bubbling or short circuit, so as to avoid automatically stopping work when abnormal conditions such as dry burning, oil bubbling or short circuit are detected, thereby reducing the user's smoke intake and improving the safety, smoking cessation effect and service life of the electronic cigarette to a certain extent.

[0032] In one embodiment, each MOS transistor switch circuit includes a PMOS switch, a pull-up resistor, an NMOS switch, and a pull-down resistor. Except for the connection between the output terminal of the level output unit and the input terminal of the comparator, the internal connection relationship of each MOS transistor switch circuit is basically the same. The source of the PMOS switch is connected to the output terminal of the bias circuit, the source of the PMOS switch is connected to one end of the pull-up resistor, the gate of the PMOS switch is connected to the other end of the pull-up resistor, and the drain of the PMOS switch is connected to one input terminal of the comparator. The gate of the PMOS switch is connected to the drain of the NMOS switch, the gate of the NMOS switch is connected to one end of the pull-down resistor, the source of the NMOS switch and the other end of the pull-down resistor are both grounded, and the gate of the NMOS switch is connected to one output terminal of the level output unit.

[0033] The two MOS tube switch circuits mentioned above correspond to Figure 1 In the embodiment, one MOS transistor switching circuit is a first MOS transistor switching circuit, and the other MOS transistor switching circuit is a second MOS transistor switching circuit. The first MOS transistor switching circuit includes a PMOS transistor MP11, a pull-up resistor R41, an NMOS transistor MN21, and a pull-down resistor R51. The first MOS transistor switching circuit is used to control the switching of the gate of the first NMOS transistor MN1 via a comparator, wherein the source of the PMOS transistor MP11 is connected to the output terminal O of the bias circuit. The second MOS transistor switching circuit includes a PMOS transistor MP12, a pull-up resistor R42, an NMOS transistor MN22, and a pull-down resistor R52. The second MOS transistor switching circuit is used to control the switching of the gate of the first NMOS transistor MN1 via a comparator, wherein the source of the PMOS transistor MP12 is connected to the output terminal O of the bias circuit. In this embodiment, the control circuit reduces signal backflow between two PMOS transistors connected to the same output port of the bias circuit, and also effectively reduces back electromotive force.

[0034] In each MOS transistor 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 maintain a high-level state when no input signal is present, ensuring that the PMOS transistor is turned off. 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 maintain a low-level state when no input signal is present, i.e., when the level output unit does not output the control signal, ensuring that the NMOS transistor is turned off. Therefore, a defined level is assigned to the gate of the MOS transistor during power-on, preventing the MOS transistor from accidentally turning on due to an uncertain output level at the port at the moment of power-on. Furthermore, in actual manufacturing processes, parasitic capacitance exists between the gate and source of the MOS transistor. Pull-up / pull-down resistors provide a discharge path for the parasitic capacitance during power-off. Furthermore, the use of pull-up / pull-down resistors prevents electrostatic breakdown, providing circuit protection.

[0035] Combine Figure 1 It can be seen that in the first MOS transistor switch circuit, the source of the switch PMOS transistor MP11 is connected to the output terminal O of the bias circuit, the source of the switch 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 switch PMOS transistor MP11 is connected to the other end of the pull-up resistor R41, and the drain of the switch PMOS transistor MP11 is connected to the negative input terminal - of the comparator; the gate of the switch PMOS transistor MP11 is connected to the drain of the switch NMOS transistor MN21, the gate of the switch NMOS transistor MN21 is connected to one end of the pull-down resistor R51, the source of the switch NMOS transistor MN21 and the other end of the pull-down resistor R51 are both grounded, and the gate of the switch NMOS transistor MN21 is connected to the output terminal A of the level output unit. In the second MOS transistor switch 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 output unit.

[0036] In the above embodiment, when the control signals output by the two output terminals of the level output unit are different, the gate voltages input to the switch NMOS transistors included in each MOS transistor switch circuit are different, and thus the drain voltages output by the switch PMOS transistors included in each MOS transistor switch circuit are different. When output terminal A of the level output unit outputs a high-level signal and output terminal B of the level output unit outputs a low-level signal, the voltage output by the source of the switch PMOS transistor MP12 is less than the voltage output by the source of the switch PMOS transistor MP11, the comparator outputs a low-level signal, and the first NMOS transistor MN1 is turned off. When output terminal A of the level output unit outputs a low-level signal and output terminal B of the level output unit outputs a high-level signal, the voltage output by the source of the switch PMOS transistor MP12 is greater than the voltage output by the source of the switch PMOS transistor MP11, the comparator outputs a high-level signal, and the first NMOS transistor MN1 is turned on.

[0037] As an example, Figure 1 As 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 and a second capacitor C2, 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 atomizer chip; the oscillation 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 to access the power supply VDD provided by the battery, and the other end of the first resistor R1 is connected to ground through the second resistor R2. The other end of the first resistor R1 is connected to one end of the third resistor R3, and 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 atomizer chip are connected to form a series branch, with one end of the series branch connected to the positive terminal of the battery and the other end of the series branch connected to the output terminal O of the bias circuit. Preferably, one end of the atomizer chip is connected to the power supply VDD provided by the battery, and the other end of the atomizer chip is connected to one end of the first capacitor C1, and 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 electrode of the battery to access the power supply VDD provided by the battery, and the other end of the second capacitor C2 is connected to the output terminal O of the bias circuit; the positive power supply terminal of the comparator is connected to the positive electrode of the battery to access the power supply VDD provided by the battery, and the output terminal of the comparator is connected to the positive power supply terminal of the comparator through the feedback resistor R6, introducing a feedback loop to make the conversion of the comparator output state faster, thereby improving the response speed; the negative power supply terminal of the comparator is grounded, so that the comparator constitutes a single-power supply voltage comparator structure and does not need to output a negative voltage.

[0038] The positive input terminal + of the comparator is connected to the drain of the switch PMOS tube included in one of the MOS tube switch circuits, and the negative input terminal - of the comparator is connected to the drain of the switch PMOS tube included in the other MOS tube switch circuit. Figure 1 In the embodiment, the drain of the switch PMOS transistor MP11 included in the first MOS transistor switch circuit is connected to the negative input terminal - of the comparator, and the drain of the switch PMOS transistor MP12 included in the second MOS transistor switch circuit is connected to the positive input terminal + of the comparator; or the drain of the switch PMOS transistor MP11 included in the first MOS transistor switch circuit is connected to the positive input terminal of the comparator, and the drain of the switch PMOS transistor MP12 included in the second MOS transistor switch circuit is connected to the negative input terminal of the comparator, Figure 1 In this embodiment, the output terminal 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 to access the power supply VDD provided by the battery. The bias circuit mainly provides the first NMOS transistor MN1 with a startup voltage through the comparator.

[0039] One end of the fourth capacitor C4 is connected to the output end 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 electrode of the battery, 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 atomizer plate through the LC network, thereby accelerating the driving of the atomizer plate to reach a resonant state. Therefore, the oscillation circuit is used to provide the frequency and voltage required to drive the atomizer plate to resonate, and the first NMOS transistor MN1 is used to control the generation and duration of the oscillation signal, wherein the oscillation frequency is related to the capacitor and inductor included in the oscillation 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.

[0040] Based on the above embodiments, Figure 1 The working process and principle of the relevant circuits in are as follows:

[0041] The first step of the control circuit's workflow is as follows: the battery is connected, and a voltage signal is applied to the source of the switch PMOS transistor MP12 and the source of the switch PMOS transistor MP11 through the first resistor R1, the second resistor R2, and the third resistor R3. The output terminal B of the level output unit outputs a high-level signal, which is applied to the switch NMOS transistor MN22 and the resistor R52, turning on the switch NMOS transistor MN22. After turning on, the switch NMOS transistor MN22 pulls down the voltage applied to the gate of the switch PMOS transistor MP12, turning on the switch PMOS transistor MP12. The voltage signal output by the output terminal of the bias circuit is applied to the positive input terminal + of the comparator through the switch PMOS transistor MP12, and the positive input terminal + of the comparator receives a high-level signal. At the same time that the output terminal B of the level output unit outputs a high-level signal, the output terminal A of the level output unit sends a low-level signal to the switch NMOS transistor MN21 and the resistor R51, turning off the switch NMOS transistor MN21. After the switch NMOS transistor MN21 is turned off, the pull-up resistor R41 pulls up the gate of the switch PMOS transistor MP11 to a high level, turning off the switch PMOS transistor MP12. The voltage signal output by the output terminal of the bias circuit cannot be applied to the negative input terminal - of the comparator through the switch PMOS transistor MP12. The negative input terminal - of the comparator remains at a low level and is considered to be grounded. Then, the comparator When the voltage at the negative input terminal - of the comparator is less than the voltage at the positive input terminal + of the comparator, the comparator outputs a high level which is applied 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 and fed back to the output terminal of the bias circuit through the first capacitor C1 to continuously control the first NMOS transistor MN1 to turn on, and are fed back to the series branch formed by the first capacitor C1 and the atomizer plate, so that the oscillation circuit drives the atomizer plate to resonate.

[0042] The second step of the control circuit's workflow is as follows: under the counting action of the timer, after the output terminal B of the level output unit outputs a high-level signal for the first preset working time, the output terminal B of the level output unit outputs a low-level signal, the switch NMOS transistor MN22 is turned off, and the pull-up resistor R42 pulls up the voltage level at the gate of the switch PMOS transistor MP12, turning off the switch PMOS transistor MP12. The voltage signal output by the output terminal of the bias circuit cannot be added to the positive input terminal + of the comparator through the switch PMOS transistor MP12, and the positive input terminal + of the comparator flips from a high level to a low level. At the same time that the output terminal B of the level output unit outputs a low-level signal, the output terminal A of the level output unit outputs a high-level signal which is applied to the switch NMOS transistor MN21 and the resistor R51, turning on the switch NMOS transistor MN21. After the switch NMOS transistor MN21 is turned on, the pull-up resistor R41 pulls down the gate voltage applied to the switch PMOS transistor MP11 to a low level, turning on the switch PMOS transistor MP11. The voltage signal output by the output terminal of the bias circuit is applied to the negative input terminal - of the comparator through the switch PMOS transistor MP12. The negative input terminal of the comparator is If the input terminal - is at a high level, the voltage input to the negative input terminal - of the comparator is greater than the voltage input to 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. The voltage is fed back to the output terminal of the bias circuit to keep the first NMOS transistor MN1 turned off. The voltage is also fed back to the series branch formed by the first capacitor C1 and the atomizer plate, so that the oscillation circuit controls the atomizer plate to stop resonating, thereby suppressing the temperature rise of the MOS transistor in the MOS transistor switch circuit.

[0043] The third step of the control circuit's workflow is as follows: under the counting action of the timer, after the output terminal B of the level output unit outputs a low-level signal for a new first preset working time, the output terminal B of the level output unit outputs a high-level signal, the switch NMOS transistor MN22 turns on, and after the switch NMOS transistor MN22 turns on, it pulls down the voltage applied to the gate of the switch PMOS transistor MP12, causing the switch PMOS transistor MP12 to turn on. The voltage signal output by the output terminal of the bias circuit is applied to the positive input terminal + of the comparator through the switch PMOS transistor MP12, and the positive input terminal + of the comparator flips from a low level to a high level. At the same time that the output terminal B of the level output unit outputs a high-level signal, the output terminal A of the level output unit outputs a low-level signal applied to the switch NMOS transistor MN21 and the resistor R51, turning off the switch NMOS transistor MN21. After the switch NMOS transistor MN21 is turned off, the pull-up resistor R41 pulls up the gate applied to the switch PMOS transistor MP11 to a high level, turning off the switch PMOS transistor MP12. The voltage signal output by the output terminal of the bias circuit cannot be applied to the negative input terminal - of the comparator through the switch PMOS transistor MP12. The negative input terminal - of the comparator remains at a low level and is considered to be grounded. The voltage input to the negative input terminal - of the comparator is When the voltage at the positive input terminal + input of the comparator is less than the voltage at the positive input terminal + input 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 driving voltage signals. These driving voltage signals are coupled and fed back to the output terminal of the bias circuit through the first capacitor C1 to continuously control the first NMOS transistor MN1 to turn on, and are fed back to the series branch formed by the first capacitor C1 and the atomizer plate, so that the oscillation circuit drives the atomizer plate to resonate. Then, the control circuit repeats the first step of the working process.

[0044] The fourth step of the control circuit's workflow is as follows: under the counting action of the timer, after the output terminal B of the level output unit outputs a high-level signal for another first preset working time, the output terminal B of the level output unit outputs a low-level signal, the switch NMOS transistor MN22 is turned off, and the pull-up resistor R42 pulls up the voltage level at the gate of the switch PMOS transistor MP12, turning off the switch PMOS transistor MP12. The voltage signal output by the output terminal of the bias circuit cannot be added to the positive input terminal + of the comparator through the switch PMOS transistor MP12, and the positive input terminal + of the comparator flips from a high level to a low level. At the same time that the output terminal B of the level output unit outputs a low-level signal, the output terminal A of the level output unit outputs a high-level signal which is applied to the switch NMOS transistor MN21 and the resistor R51, turning on the switch NMOS transistor MN21. After the switch NMOS transistor MN21 is turned on, the pull-up resistor R41 pulls down the gate voltage applied to the switch PMOS transistor MP11 to a low level, turning on the switch PMOS transistor MP11. The voltage signal output by the output terminal of the bias circuit is applied to the negative input terminal - of the comparator through the switch PMOS transistor MP12. The negative input terminal of the comparator If the voltage at the negative input terminal - of the comparator 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 voltage, which is applied to the gate of the first NMOS transistor MN1, turning off the first NMOS transistor MN1. This voltage is fed back to the output terminal of the bias circuit to keep the first NMOS transistor MN1 turned off. This voltage is also fed back to the series branch formed by the first capacitor C1 and the atomizer plate, causing the oscillator circuit to control the atomizer 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 control circuit repeating the second step of the workflow. Therefore, by setting the first preset operating time to maintain this periodic mist-discharging operating state, the control circuit can dissipate heat in the relevant MOS transistor within the limited time of disconnection. It can also prompt the user to check for abnormal operating conditions such as dry burning, oil soaking, or short circuit, reducing the user's smoke intake and, to a certain extent, improving the safety, smoking cessation effect, and service life of the e-cigarette.

[0045] Preferably, if the control circuit is not working, the output terminal B and the output terminal A of the level output unit simultaneously output low-level signals, the switch NMOS tube MN22 is turned off, and the pull-up resistor R42 pulls up the level at the gate of the switch PMOS tube MP12, so that the switch PMOS tube MP12 is turned off, and the voltage signal output by the output terminal of the bias circuit cannot be added to the positive input terminal + of the comparator through the switch PMOS tube MP12; at the same time, the switch NMOS tube MN21 is turned off. After the switch NMOS tube MN21 is turned off, the pull-up resistor R41 will apply the voltage to the switch PMOS tube MP12. The gate of the MOS transistor MP11 is pulled up to a high level, turning off the switch PMOS transistor MP12. The voltage signal outputted by the output terminal of the bias circuit cannot be added to the negative input terminal - of the comparator through the switch 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 flip the low-level signal originally maintained at the output terminal of the comparator to a high-level signal. The first NMOS transistor MN1 is turned off, and the oscillation circuit stops working, thereby stopping the oscillation circuit from driving the atomizer plate to resonate. That is, the atomizer plate stops continuing the atomization operation.

[0046] In summary, the timer is used to time the pulse signal or constant control signal output by the comparator; the level output unit is used to flip the output control signal of each output end of the level output unit whenever the timer counts the first preset working time, so as to cyclically switch the on-off status of the MOS tube in the two MOS tube switch circuits, and then the comparator and the first MOS tube are used to feed back to the oscillation circuit, so that: the control circuit adopts a timed intermittent working mode of multiple transistors, and limits the temperature rise of the MOS tube by timing the on-time of the MOS tube, so that the MOS tube can dissipate the accumulated heat in time when it stops working, thereby reducing the temperature of the MOS tube, and realizing that the mist output of the atomizer is adjusted under the control of the level output unit and the timer, reducing power consumption and processing load, reducing the user's smoke intake, and to a certain extent improving the safety of electronic cigarettes or other electronic atomization terminals, the smoking cessation effect and service life of electronic cigarettes.

[0047] Based on the aforementioned embodiments, an electronic atomization terminal is also disclosed, comprising a control circuit disclosed in any of the aforementioned embodiments. Specifically, in the control circuit, two MOS transistor switch circuits obtain a control signal for controlling the periodic on / off of a first NMOS transistor through a comparator, thereby controlling the periodic generation of an oscillation signal without maintaining the continuous generation of the oscillation signal, thereby controlling the periodic on / off of an atomizing plate in the electronic atomization terminal, and automatically controlling the amount of mist output from the atomizer. The electronic atomization terminal disclosed in this embodiment adopts a comparator to reflect the voltage changes transmitted by the two MOS tube switch circuits, and feeds back the frequency information and voltage information of the current need to start oscillation or stop oscillation to the oscillation circuit through the first NMOS tube. The frequency information fed back to the oscillation circuit is derived from the signal frequency transmitted by the currently turned-on MOS tube switch circuit, and the voltage information fed back to the oscillation circuit is the comparison result between the voltage signals transmitted by the two MOS tube switch circuits. Under the control of the voltage switched output by the two output ends of the level output unit, the two MOS tube switch circuits are supported to be turned on in turn at regular intervals. The result of the comparator output is used to control the periodic on and off of the first NMOS tube, so that the oscillation circuit automatically stops generating the oscillation signal, sacrificing the user's smoking experience to reduce the problems of continuous temperature increase and voltage overshoot of the first NMOS tube. The control circuit also includes a timer, which is used to time the pulse signal or constant control signal output by the comparator; the level output unit is used to flip the output control signal of each output end of the level output unit whenever the timer counts the first preset working time, so as to cyclically switch the on-off status of the MOS tube in the two MOS tube switch circuits, and then the aforementioned comparator and the first MOS tube are used to feed back to the oscillation circuit, so that the amount of fog output from the atomizer plate is adjusted under the control of the level output unit and the timer, reducing power consumption and processing load. Therefore, the control circuit maintains this periodic fog output working state by setting the first preset working time, which can allow the relevant MOS tube to dissipate heat within the limited time of disconnection, and can also prompt the user to check for abnormal working conditions such as dry burning, oil bubbling or short circuit, so as to avoid automatically stopping work when abnormal conditions such as dry burning, oil bubbling or short circuit are detected, thereby reducing the user's smoke intake and improving the safety and service life of the electronic atomization terminal to a certain extent.

[0048] In some embodiments, the electronic atomization terminal includes a cigarette rod and a cigarette cartridge, and the electronic atomization terminal can be an electronic cigarette. The control circuit is arranged in the cigarette rod, wherein the control circuit can be arranged on the mouthpiece side of the cigarette rod. The cigarette rod can be provided with an airflow sensor to detect the amount of mist output from the atomizer plate or the airflow value formed by the smoke generated by the atomizer plate circulating in the cigarette rod. Specifically, the airflow sensor can detect the airflow change information in the direction from the non-mouthpiece side of the cigarette rod toward the mouthpiece side. The atomizer plate is arranged in the cigarette cartridge, and the atomizer plate can be arranged upstream of the cigarette cartridge on the flow path of the gas inhaled from the mouthpiece side (the flow path of the smoke generated by the atomizer plate can be the flow path from the non-mouthpiece side to the mouthpiece side).

[0049] 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, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

Claims

1. A control circuit for an electronic cigarette atomizer, characterized in that: The control circuit includes a bias circuit, an oscillation circuit, a coupling circuit, a level output unit, two MOS tube switch circuits, a comparator and a first NMOS tube; The oscillation circuit is connected to the atomizer through the bias circuit and the coupling circuit in sequence; The source of the PMOS transistor in each MOS transistor switch circuit is connected to the output end of the bias circuit, the gate of the NMOS transistor in each MOS transistor switch circuit is connected to an output end of the level output unit, the drain of the PMOS transistor in each MOS transistor switch circuit is connected to an input end of the comparator, the output end 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 oscillation circuit; wherein the drain of the first NMOS transistor and the bias circuit are both connected to the battery; The control circuit further includes a timer; A timer is connected to the comparator; the timer is used to time the signal output by the comparator; the timer is connected to the level output unit; the level output unit is used to change the control signal output by each output terminal of the level output unit each time the timer counts the first preset working time, so as to periodically change the working state of the oscillation circuit; When the MOS transistor switch 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 output unit, the MOS transistor switch 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 output unit. The signal output by the comparator turns on the first NMOS transistor, so that the oscillation circuit drives the atomizer plate to resonate. When the MOS transistor switch 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 output unit, the MOS transistor switch 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 output unit. The control signal output by the comparator turns off the first NMOS transistor, so that the atomizer plate stops resonating. When the control signals outputted from the two output terminals of the level output unit are different, the gate input voltages of the NMOS switch tubes included in each MOS switch circuit are different, and the drain output voltages of the PMOS switch tubes included in each MOS switch circuit are also different.

2. The control circuit according to claim 1, characterized in that: The level output unit includes a first selector and a second selector; two different control signals are set inside the level output unit, and the two different control signals are respectively input into the two input ends of the first selector, and the two different control signals are respectively input into the two input ends of the second selector; The level output unit is provided with a first output end and a second output end, the output end of the first selector is the first output end, and the output end of the second selector is the second output end; 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; a timer, configured to output a counting flag signal to the level output unit whenever counting a first preset working time; When the selection control end of the first selector receives the counting flag signal, the first selector selects to output a control signal different from the control signal output by the first output end during the previous first preset working time, and controls the currently selected output control signal to remain unchanged during the current first preset working time; When the selection control end of the second selector receives the counting flag signal, the second selector selects to output a control signal that is different from the control signal output by the second output end during the previous first preset working time, and controls the control signal currently selected to output to remain unchanged during the current first preset working time.

3. The control circuit according to claim 1, characterized in that: The first preset working time is a counting time determined to ensure that the mist output of the atomizing plate does not exceed the upper limit of the expected range; The control circuit triggers the atomizer plate to start resonance and stop resonance in succession within two adjacent first preset working times, or triggers the atomizer plate to stop resonance and start resonance again within two adjacent first preset working times.

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

5. The control circuit according to claim 1, characterized in that: The bias circuit includes a first resistor, a second resistor and a third resistor; The coupling circuit includes a first capacitor and a second capacitor; The oscillation 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 electrode of the battery, 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 end of the bias circuit; A first capacitor and the atomizer plate are connected to form a series branch, one end of the series branch is connected to the positive electrode of the battery, and the other end of the series branch is connected to the output end of the bias circuit; one end of the second capacitor is connected to the positive electrode of the battery, and the other end of the second capacitor is connected to the output end of the bias circuit; One end of a fourth capacitor is connected to the output end of the bias circuit, and the other end of the fourth capacitor is grounded via 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 electrode of the battery, 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 electrode of the battery, the output terminal of the comparator is connected to the positive power supply terminal of the comparator through a feedback resistor, 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 switch PMOS tube included in one of the MOS tube switch circuits, and the negative input terminal of the comparator is connected to the drain of the switch PMOS tube included in the other MOS tube switch circuit.

6. An electronic atomization terminal, characterized in that: The method comprises the control circuit according to any one of claims 1 to 5.

7. The electronic atomization terminal according to claim 6, characterized in that: The electronic atomization terminal includes a cigarette rod and a cigarette cartridge. The control circuit is arranged in the cigarette rod, and the atomization sheet is arranged in the cigarette cartridge. The cigarette oil in the electronic atomization terminal is the raw material for generating smoke.

Images