Atomizer oscillation control circuit and electronic atomizer terminal

Abstract

The present application discloses an atomizer sheet oscillation control circuit and an electronic atomizer terminal. The atomizer sheet oscillation control circuit includes a microcontroller, a drive signal generating circuit, a boost oscillation circuit, a drive signal regulating circuit, a switch circuit and a power supply assembly; the power supply assembly is connected to one end of the atomizer sheet through the drive signal generating circuit, the drive signal regulating circuit and the switch circuit in sequence, and the power supply assembly is also connected to the other end of the atomizer sheet through the boost oscillation circuit, and the duty cycle output end of the microcontroller is connected to the signal input end of the drive signal generating circuit. The signal output end of the drive signal generating circuit is connected to the trigger input end of the drive signal regulating circuit, and the regulating output end of the drive signal regulating circuit is connected to the control end of the switch circuit; one end of the atomizer sheet is connected to the output end of the switch circuit, and the other end of the atomizer sheet is connected to the output end of the boost oscillation circuit, so that the atomizer sheet generates a periodic amplitude.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic electronic cigarettes, and in particular to an atomizer plate oscillation control circuit and an electronic atomizer terminal. Background Art

[0002] Existing ultrasonic electronic cigarette atomizer drive circuits all use universal three-point capacitor and three-point inductor oscillation circuits to obtain excitation signals to drive the ultrasonic atomizer to oscillate, and rely on a single transistor to control operation. When working, the power driving capability of the transistor in the form of a discrete component is poor. In addition, the temperature of the transistor will rise to the transistor's limit temperature in a short period of time, making it extremely easy to be damaged.

[0003] In order to increase the driving current and voltage to meet the requirements of the resonant operation of the atomizer, the existing technology will arrange multiple discrete devices such as transistors, resistors, capacitors, etc. in the limited space of the e-cigarette, and additionally set up a detection network and a multi-order RC filter network. This increases the difficulty of layout of discrete components and is prone to heat accumulation, making it difficult to achieve miniaturization of ultrasonic e-cigarettes. Summary of the Invention

[0004] This application discloses an atomizer oscillation control circuit and an electronic atomizer terminal, including the following technical solutions:

[0005] The atomizer plate oscillation control circuit includes a microcontroller, a drive signal generating circuit, a boost oscillation circuit, a drive signal regulation circuit, a switching circuit and a power supply component; the power supply component is connected to one end of the atomizer plate through the drive signal generating circuit, the drive signal regulation circuit and the switching circuit in sequence, and the power supply component is also connected to the other end of the atomizer plate through the boost oscillation circuit, and the duty cycle output end of the microcontroller is connected to the signal input end of the drive signal generating circuit.

[0006] Furthermore, the signal output end of the drive signal generating circuit is connected to the trigger input end of the drive signal regulating circuit, and the regulating output end of the drive signal regulating circuit is connected to the control end of the switching circuit; one end of the atomizing sheet is connected to the output end of the switching circuit, and the other end of the atomizing sheet is connected to the output end of the boost oscillation circuit.

[0007] Furthermore, the drive signal generating circuit includes a first resistor, a second resistor, an inverter, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a first PMOS transistor, a first NMOS transistor, and a second NMOS transistor; the first input end of the inverter is the signal input end of the drive signal generating circuit, and the first input end of the inverter is connected to the PWM signal output by the microcontroller; the first resistor is connected between the first input end and the second input end of the inverter, and the first input end of the inverter is connected to the positive power supply end of the inverter through the second resistor; the positive power supply end of the inverter is connected to one end of the third resistor, the other end of the third resistor is connected between the first capacitor and the fourth resistor, and the other end of the third resistor is connected to the positive power supply end of the inverter. The end is also connected to the power supply component; the power supply component is grounded through a first capacitor, and the drain of the first NMOS tube is connected to the power supply component through a fourth resistor; the source of the first PMOS tube is connected to the source of the first NMOS tube, the gate of the first PMOS tube is connected to the gate of the first NMOS tube, the gate of the first NMOS tube is connected to the output end of the inverter, the drain of the first PMOS tube is grounded, and the drain of the second NMOS tube is connected between the source of the first PMOS tube and the source of the first NMOS tube. The drive signal generating circuit is connected to the drive signal regulating circuit through the second NMOS tube, wherein the signal output end of the drive signal generating circuit is the source of the second NMOS tube.

[0008] Furthermore, the drive signal adjustment circuit includes a monostable trigger chip, a second capacitor and a fifth resistor; the upper edge trigger input terminal of the monostable trigger chip is connected to the source of the second NMOS tube, and the lower edge trigger input terminal of the monostable trigger chip and the ground terminal of the monostable trigger chip are both grounded; the reset terminal of the monostable trigger chip and the power supply terminal of the monostable trigger chip are both connected to the power supply component; one end of the fifth resistor is connected to the power supply component, the other end of the fifth resistor is connected to one end of the second capacitor, the other end of the second capacitor is grounded, and the fifth resistor is connected to the power supply terminal of the monostable trigger chip and the monostable trigger chip. The fifth resistor and the second capacitor are connected between the external terminals of the resistor of the monostable trigger chip and the external terminals of the capacitor of the monostable trigger chip; the trigger input terminal of the drive signal adjustment circuit is the upper edge trigger input terminal of the monostable trigger chip, and the output terminal of the monostable trigger chip is the adjustment output terminal of the drive signal adjustment circuit; wherein the time constant of the fifth resistor and the second capacitor determines the timing period required for the output terminal of the monostable trigger chip to generate a level signal of a preset pulse width; the signal frequency input to the trigger input terminal of the drive signal adjustment circuit is the same as the signal frequency output from the adjustment output terminal of the drive signal adjustment circuit.

[0009] Furthermore, the drive signal adjustment circuit also includes a sixth resistor and a switch; one end of the sixth resistor is connected to the gate of the second NMOS tube, and the other end of the sixth resistor is connected to the power supply component; one end of the switch is simultaneously connected to the gate of the second NMOS tube and the duty cycle enable end of the microcontroller, and the other end of the switch is grounded.

[0010] Furthermore, the switching circuit includes a seventh resistor and a third NMOS transistor, the gate of the third NMOS transistor is connected to one end of the seventh resistor, the source of the third NMOS transistor is connected to the other end of the seventh resistor, the other end of the seventh resistor is grounded, the drain of the third NMOS transistor is the output end of the switching circuit to be connected to the atomizer plate, and the control end of the switching circuit is the gate of the third NMOS transistor to be connected to the drive signal adjustment circuit.

[0011] Furthermore, the boost oscillation circuit includes a linear boost unit, an inductor, a third capacitor, a fourth capacitor, and an eighth resistor; the input end of the linear boost unit is connected to the power supply assembly, the output end of the linear boost unit is connected to one end of the inductor, the other end of the inductor is connected to one end of the third capacitor, the other end of the third capacitor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded; one end of the eighth resistor is connected between the inductor and the third capacitor, and the other end of the eighth resistor is connected to the output end of the switching circuit; the output end of the boost oscillation circuit is arranged at the common end of the third capacitor and the fourth capacitor; wherein the linear boost unit is a DC boost chip or a resistor-capacitor boost circuit connected to a DC boost chip.

[0012] Furthermore, the microcontroller supports modulating AC signals or DC signals into PWM signals and outputting them from the duty cycle output end; the power supply component is used to provide DC signals or AC signals to the drive signal generating circuit, the boost oscillation circuit, and the drive signal regulating circuit respectively.

[0013] Furthermore, the atomizer includes but is not limited to a piezoelectric ceramic sheet; the atomizer generates surface elastic waves after oscillating at a certain frequency to atomize the liquid on the surface of the atomizer; wherein the certain frequency is generated by the boost oscillation circuit and the switching circuit applying voltage to the atomizer.

[0014] An electronic atomization terminal comprises the atomization sheet oscillation control circuit.

[0015] The present application is based on improving the driving ability of the atomizer to work, including increasing the driving voltage and making the time for the atomizer to be in an oscillation state controllable. In the atomizer oscillation control circuit disclosed in the present application, the drive signal generating circuit is used to shape the PWM signal provided by the microcontroller into a stable square wave signal, and provide a sufficiently large drive voltage and current to the boost oscillation circuit and the drive signal adjustment circuit, triggering the drive signal adjustment circuit to speed up the response to the high-level signal or low-level signal output by the drive signal generating circuit, and triggering the drive signal adjustment circuit to generate positive and negative pulse signals of a certain time width, that is, to generate a single output pulse of a specified width, that is, "high" or "low", which not only allows the MOS tube in the switch circuit to be turned on to the ground for rapid discharge, but also allows the drive signal adjustment circuit to periodically control the opening and closing of the switch circuit. Therefore, by timing the opening time of the switch circuit, the temperature rise of the discrete components or chip modules is limited, and the influence of temperature on the operation of the atomizer is suppressed.

[0016] The boost oscillation circuit is equipped with a linear boost unit, which reduces the use of a voltage divider network composed of discrete resistor elements and a filter network composed of discrete resistor elements and discrete capacitor elements, and designs the necessary inductor and capacitor network to drive the atomizer to oscillate at high frequency.

[0017] The drive signal conditioning circuit incorporates a monostable trigger chip. When triggered by an externally applied duty cycle signal, the circuit can alternately output high-level and low-level signals of a certain duration, based on a time constant determined by a resistor-capacitor network consisting of a single capacitor and a single resistor. This occurs within a timing cycle determined by the time constant, causing the atomizer plate to oscillate and stop oscillating within a controllable time (a pulse width determined by the resistor and capacitor externally connected to the monostable trigger chip). This monostable trigger periodically regulates the oscillation signal generated by the boost oscillation circuit for driving the atomizer plate. This suppresses the continuous heating of the associated MOS transistors while maximizing the use of chip modules to construct the drive signal conditioning circuit. For example, this eliminates the need for continuous heating throughout a complete cycle.

[0018] The drive signal generating circuit is equipped with a totem circuit consisting of an inverter and a pair of MOS tubes. Compared with the existing technology, it uses a small number of discrete components in conjunction with a single circuit module to obtain a pulse signal with a higher drive voltage and a more stable drive voltage. Then, under the joint action of the drive signal adjustment circuit and the boost oscillation circuit, the atomizer plate is accelerated to reach a resonant state within a certain period of time.

[0019] In summary, the present application uses at most one RC network and at most one chip module in each circuit to control the oscillation of the atomizer plate, which is not easy to accumulate heat, overcomes the influence of excessive temperature of the MOS tube, and also easily realizes the miniaturization of the electronic atomization terminal equipped with the atomizer plate oscillation control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of an atomizer plate oscillation control circuit disclosed in an embodiment. DETAILED DESCRIPTION

[0021] 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.

[0022] As an embodiment, an atomizer oscillation control circuit is disclosed, see Figure 1 It can be seen that the atomizer sheet oscillation control circuit disclosed in this embodiment includes a microcontroller, a drive signal generating circuit, a boost oscillation circuit, a drive signal regulating circuit, a switching circuit and a power supply component; the power supply component is connected to one end of the atomizer sheet through the drive signal generating circuit, the drive signal regulating circuit and the switching circuit in sequence, and the power supply component is also connected to the other end of the atomizer sheet through the boost oscillation circuit, that is, the drive signal generating circuit, the drive signal regulating circuit, the switching circuit, and the boost oscillation circuit are connected between the microcontroller and the atomizer sheet or between the power supply component and the atomizer sheet; wherein, the drive signal generating circuit, the drive signal regulating circuit and the switching circuit are connected in series, and the boost oscillation circuit and the atomizer sheet are connected in series; it can be understood that the boost oscillation circuit is first connected in series with the atomizer sheet, and then connected in series with the switching circuit, the drive signal regulating circuit and the drive signal generating circuit in sequence. Of course, the drive signal generating circuit is first connected in series with the drive signal regulating circuit, and then connected in series with the switching circuit, the atomizer sheet and the boost oscillation circuit in sequence.

[0023] It should be noted that, in this embodiment, the oscillation working circuit of the atomizer sheet can be a closed loop formed by starting from the positive electrode of the power supply assembly, passing through the drive signal generating circuit, the drive signal regulating circuit, the switching circuit, the positive electrode of the atomizer sheet, the negative electrode of the atomizer sheet, the boost oscillation circuit, and finally returning to the negative electrode of the power supply assembly. Moreover, in this embodiment, the atomizer sheet oscillation control circuit and the atomizer sheet are both installed in the housing of the electronic atomization terminal, and the atomizer sheet oscillation control circuit is preferably installed on the drive circuit substrate inside the housing of the electronic cigarette.

[0024] The duty cycle output terminal of the microcontroller is connected to the signal input terminal of the drive signal generating circuit. The duty cycle output terminal of the microcontroller is the signal output terminal of the microcontroller. Under the control of the PWM signal output by the duty cycle output terminal of the microcontroller, the drive signal generating circuit shapes the PWM signal and then adjusts the pulse width through the drive signal adjustment circuit to stably control the on and off of the switching circuit. It can be understood as whether the atomizer plate oscillation control circuit controls the atomizer plate to oscillate and accelerate the oscillation connection.

[0025] The microcontroller includes a single-chip microcomputer, a microprocessor, or a DSP. The microcontroller is configured to at least support modulating an AC signal or a DC signal into a PWM signal and outputting it from a duty cycle output terminal. The signal to be modulated can be a low-frequency signal, which is modulated to form a high-frequency signal output to be regulated by the drive signal generating circuit and the drive signal regulating circuit. The power supply component is used to provide a DC signal or an AC signal to the drive signal generating circuit, the boost oscillation circuit, and the drive signal regulating circuit, respectively. The power supply voltage provided by the power supply component is generally 1.8V, 3.3V, or 5V.

[0026] In this embodiment, the drive signal adjustment circuit is used to shape the duty cycle signal output by the drive signal generating circuit, including amplifying and inverting the PWM signal output by the microcontroller to improve the driving capability (including driving current and driving voltage) of the PWM signal and obtain a stable square wave signal; for the convenience of control, the signal output end of the drive signal generating circuit is connected to the trigger input end of the drive signal adjustment circuit, and the trigger input end of the drive signal adjustment circuit receives a more stable square wave signal, and the drive signal adjustment circuit is used to adjust the pulse width of the duty cycle signal output by the drive signal generating circuit, including adjusting the pulse width of the high level signal or the low level signal, so as to adjust the pulse width in a more stable and effective level state; the adjustment output end of the drive signal adjustment circuit is connected to the control end of the switch circuit. The control terminal is connected, the switching circuit is turned on when a high-level signal is output from the regulating output terminal of the driving signal regulating circuit, and the switching circuit is turned off when a low-level signal is output from the regulating output terminal of the driving signal regulating circuit, wherein the high-level signal and the low-level signal output from the regulating output terminal of the driving signal regulating circuit are generated alternately during the period when the puffer uses the electronic atomization terminal where the atomizer plate oscillation control circuit is located; one end of the atomizer plate is connected to the output terminal of the switching circuit, and the other end of the atomizer plate is connected to the output terminal of the boost oscillation circuit, so that the atomizer plate generates a periodic amplitude, then the MOS tube will heat up in a time period, and then will be cut off in an adjacent time period to cool down and dissipate heat. The atomizer plate can also be kept at a fixed operating frequency for oscillation during the conduction phase of the switching circuit, so that it is easy to stabilize in the resonant working state.

[0027] In this embodiment, the boost oscillation circuit is provided with a linear boost unit, which reduces the use of a voltage divider network composed of discrete resistor elements and a filter network composed of discrete resistor elements and discrete capacitor elements, and designs the necessary inductor and capacitor network to drive the atomizer to oscillate at high frequency.

[0028] The drive signal conditioning circuit incorporates a monostable trigger chip. When triggered by an externally applied duty cycle signal, the circuit can alternately output high-level and low-level signals of a certain duration, based on a time constant determined by a resistor-capacitor network consisting of a single capacitor and a single resistor. This occurs within a timing cycle determined by the time constant, causing the atomizer plate to oscillate and stop oscillating within a controllable time (a pulse width determined by the resistor and capacitor externally connected to the monostable trigger chip). This monostable trigger periodically regulates the oscillation signal generated by the boost oscillation circuit for driving the atomizer plate. This suppresses the continuous heating of the associated MOS transistors while maximizing the use of chip modules to construct the drive signal conditioning circuit. For example, this eliminates the need for continuous heating throughout a complete cycle.

[0029] It should be noted that the atomizer includes but is not limited to a piezoelectric ceramic sheet; the atomizer generates surface elastic waves after oscillating at a certain frequency to atomize the liquid on the surface of the atomizer; wherein the certain frequency is generated by the boost oscillation circuit and the switching circuit applying voltage to the atomizer; when the certain frequency is at the resonant frequency (resonant frequency), the atomization efficiency of the atomizer is the highest, and after the atomizer is in a resonant state, the effect of temperature on the working efficiency of the atomizer is overcome to a certain extent. Specifically, the atomizer can have a piezoelectric element substrate, which has a comb-shaped electrode pair; when the liquid supply part provided in the electronic atomization terminal supplies the liquid to be atomized to the above-mentioned piezoelectric element substrate, the above-mentioned piezoelectric element substrate is configured to atomize the liquid by using the surface elastic waves generated by applying voltage to the above-mentioned comb-shaped electrode pair at a high frequency (which can reach the resonant frequency or resonant frequency). The boost oscillation circuit can supply the power required for the oscillation of the comb-shaped electrode pair, including the voltage and frequency required to drive the atomizer plate to oscillate. At the same time, the drive signal generating circuit, the drive signal regulating circuit and the switching circuit serve as the electrical signal on-off and time regulating circuits for driving the atomizer plate to oscillate, and are used to improve the atomization efficiency of the atomizer plate.

[0030] In some embodiments, both the boost oscillator circuit and the drive signal conditioning circuit generate a high-frequency signal, including a high-frequency voltage, wherein the high-frequency voltage has a periodic amplitude. The periodic amplitude of the high-frequency voltage can describe a sine wave shape, a rectangular wave shape, a triangular wave shape, or a sawtooth wave shape. Preferably, the high-frequency voltage is applied in such a manner that the periodic amplitude of the high-frequency voltage describes a rectangular wave shape. Under the constraints of the pulse width adjusted by the drive signal conditioning circuit, the boost oscillator circuit is configured to periodically control the frequency of the voltage applied to the comb electrode pair, thereby controlling the oscillation frequency of the comb electrode pair to a resonant frequency. In some oscillation environments, the resonant frequency can vary over time due to factors such as temperature. By monitoring the output signal of the boost oscillator circuit and its frequency over time, the drive signal generating circuit, the drive signal conditioning circuit, and the switching circuit can be controlled, including adjusting the pulse width of the high-level signal and the pulse width of the low-level signal. Power is then supplied at the monitored optimal frequency, thereby improving the atomization efficiency of the atomizer.

[0031] As an example, see Figure 1It can be seen that the driving signal generating circuit includes a first resistor R1, a second resistor R2, an inverter U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a first PMOS transistor MP1, a first NMOS transistor MN1 and a second NMOS transistor MN2; the first input end of the inverter U1 is the signal input end of the driving signal generating circuit, and the first input end of the inverter U1 is connected to the PWM signal output by the microcontroller; the first resistor R1 is connected between the first input end of the inverter U1 and the second input end of the inverter U1, and the first input end of the inverter U1 is connected to the first input end of the inverter U1. The positive power supply terminal of the inverter U1 is connected to one end of the third resistor R3 through the second resistor R2; the positive power supply terminal of the inverter U1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected between the first capacitor C1 and the fourth resistor R4, wherein one end of the first capacitor C1 is connected to one end of the fourth resistor R4, and the drain of the first NMOS tube is connected to the other end of the fourth resistor R4; the other end of the third resistor R3 is also connected to the power supply component, that is, the other end of the third resistor R3 is connected to VCC (which can be regarded as the voltage provided by the positive power supply terminal of the power supply component), and the negative power supply terminal of the power supply component is grounded.

[0032] The power supply assembly is grounded via a first capacitor C1, and the drain of the first NMOS transistor MN1 is connected to the power supply assembly via a fourth resistor R4. The source of the first PMOS transistor MP1 is connected to the source of the first NMOS transistor MN1, the gate of the first PMOS transistor MP1 is connected to the gate of the first NMOS transistor MN1, the gate of the first NMOS transistor MN1 is connected to the output end of the inverter U1, the drain of the first PMOS transistor MP1 is grounded, and the drain of the second NMOS transistor MN2 is connected between the source of the first PMOS transistor MP1 and the source of the first NMOS transistor MN1. The drive signal generating circuit is connected to the drive signal regulating circuit via the second NMOS transistor MN2, wherein the signal output end of the drive signal generating circuit is the source of the second NMOS transistor MN2, and the second NMOS transistor MN2 serves as a switch transistor. The first NMOS transistor MN1 and the first PMOS transistor MP1 form a totem pole circuit to enhance voltage driving capability. The inverter U1 and the totem pole circuit use the same power supply voltage VCC, and the power supply voltage VCC does not exceed 20V.

[0033] In this embodiment, the PWM signal output by the microcontroller is inverted and rectified by inverter U1 into a stable square wave signal, while providing sufficient drive voltage / current to drive a totem pole circuit composed of a first NMOS transistor MN1 and a first PMOS transistor MP1. Specifically, the logic of the totem pole's operation is that a high-level input turns on the upper transistor and turns off the lower transistor, outputting a high level; a low-level input turns on the lower transistor and turns off the upper transistor, outputting a low level. Of course, transistors known to those skilled in the art can be used to form the totem pole circuit. Furthermore, considering the transistor combination, the upper transistor can also be a PNP transistor, the collector of which can be connected to a transformer to provide power to the auxiliary winding output.

[0034] Based on the above embodiments, Figure 1 As shown, the driving signal adjustment circuit includes a monostable trigger chip, a second capacitor C2 and a fifth resistor R5; the upper edge trigger input terminal B of the monostable trigger chip is connected to the source of the second NMOS transistor MN2; the lower edge trigger input terminal A of the monostable trigger chip and the ground terminal GND of the monostable trigger chip are both grounded; the clear terminal CLR of the monostable trigger chip and the power supply terminal VDD of the monostable trigger chip are both connected to the power supply component, that is, connected to the power supply voltage VCC; one end of the fifth resistor R5 is connected to the power supply component, the other end of the fifth resistor R5 is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is grounded, and the fifth resistor R5 is connected to the power supply terminal of the monostable trigger chip. A resistor is connected between VDD and the external resistor terminal REXT of the monostable trigger chip, and a second capacitor C2 is connected between the external resistor terminal REXT of the monostable trigger chip and the external capacitor terminal CEXT of the monostable trigger chip; the trigger input terminal of the drive signal adjustment circuit is the upper edge trigger input terminal B of the monostable trigger chip, and the output terminal Q of the monostable trigger chip is the adjustment output terminal of the drive signal adjustment circuit; wherein the time constant of the fifth resistor R5 and the second capacitor C2 determines the timing period required for the output terminal Q of the monostable trigger chip to generate a level signal with a preset pulse width, including the duration required for a high-level signal or a low-level signal, which can correspond to the on-time or off-time of a transistor or MOS tube. The signal frequency input to the trigger input terminal of the drive signal adjustment circuit is the same as the signal frequency output from the adjustment output terminal of the drive signal adjustment circuit, but the voltage input to the trigger input terminal of the drive signal adjustment circuit is not necessarily the same as the voltage output from the adjustment output terminal of the drive signal adjustment circuit, and there is a time delay between the input and output signals of the drive signal adjustment circuit.

[0035] It should be noted that when a suitable external trigger signal or pulse is applied to the upper edge trigger input terminal B of the monostable trigger chip, the output terminal Q of the monostable trigger chip is used to generate a single output pulse of a specified width, that is, to output a high-level signal or a low-level signal of a certain time width. After the monostable trigger chip is applied with an external trigger signal or pulse, a timing cycle will be started, which can be understood as undergoing a complete timing cycle in response to the single pulse signal output by the drive signal generating circuit. This timing cycle causes the output signal of the output terminal of the monostable trigger chip to change its state at the beginning of the timing cycle, which will correspondingly change the on-off state of the switching circuit and can be maintained in the new state on this basis. At least a relatively fixed pulse width can be set, so that the frequency applied by the boost oscillation circuit is kept within the above-mentioned timing cycle for dynamic control, and can provide a resonant frequency for the oscillation working circuit of the atomizer within a constant time. The timing period is determined by the product of the fifth resistor R5 and the second capacitor C2, and is used to configure the pulse width output by the drive signal adjustment circuit, including the pulse width of the high-level signal or the low-level signal, which corresponds to the on-time or off-time of the transistor or MOS tube; in addition, the length of the timing period has nothing to do with the duration of the signal input to the drive signal adjustment circuit, thereby reducing the impact of interference factors carried by external input signals or the boost oscillation circuit on the pulse width and frequency of the PWM signal.

[0036] In some embodiments, the monostable trigger chip may include a 74LVC1G123 integrated chip. The monostable trigger chip may also be implemented using a 555 timer. The monostable trigger chip can generate a very short pulse or a longer rectangular waveform, whose leading edge rises over time in response to an externally applied trigger pulse and whose trailing edge depends on the RC time constant of the feedback component used. This RC time constant, over time, produces a series of controlled, fixed time delays relative to the original trigger pulse. Alternatively, the monostable trigger chip can generate a very short pulse or a longer rectangular waveform, whose leading edge rises over time in response to an externally applied trigger pulse and whose trailing edge depends on the RC time constant of the feedback component used. This RC time constant, over time, produces a series of controlled, fixed time delays relative to the original trigger pulse.

[0037] Based on the above embodiments, Figure 1As shown, the drive signal adjustment circuit also includes a sixth resistor R6 and a switch S1; one end of the sixth resistor R6 is connected to the gate of the second NMOS transistor MN2, and the other end of the sixth resistor R6 is connected to the power supply component, that is, the other end of the sixth resistor R6 is connected to the power supply voltage VCC; one end of the switch S1 is connected to the gate of the second NMOS transistor MN2, and one end of the switch S1 is simultaneously connected to the gate of the second NMOS transistor MN2 and the duty cycle enable terminal of the microcontroller, and the other end of the switch S1 is grounded, wherein the switch S1 is equivalent to a switch connected in series between the drive signal generating circuit and the monostable trigger chip, and is used to control the on and off of the oscillation working circuit composed of the power supply component, the drive signal generating circuit, the drive signal adjustment circuit, the switching circuit, the atomizer plate, and the boost oscillation circuit.

[0038] Under the condition that the atomizer plate oscillation control circuit and the atomizer plate are both arranged inside the electronic cigarette, the switch S1 is triggered to close or open according to the user's smoking operation. The specific form of the switch S1 can be a mechanical button switch or an air pressure sensor, that is, the switch S1 supports manual pressing or automatic sensing of airflow changes to detect whether a puffing action occurs. When the smoker starts to smoke, the switch S1 is disconnected, and the voltage at the duty cycle enable terminal of the microcontroller is the power supply voltage VCC divided by the sixth resistor R6. Then, the voltage at the duty cycle enable terminal of the microcontroller is a high level, triggering the microcontroller to provide the PWM signal to the drive signal generating circuit, thereby providing the atomizer plate with the driving voltage and frequency required for oscillation. After the atomizer plate oscillates at a certain frequency, it generates surface elastic waves to atomize the liquid on the surface of the atomizer plate. When the smoker stops smoking, the switch S1 is closed, the branch where the sixth resistor R6 is located is short-circuited, and the voltage at the duty cycle enable terminal of the microcontroller is 0, which triggers the microcontroller to stop providing the PWM signal to the drive signal generating circuit, thereby cutting off the oscillation working loop, the atomizer plate stops working, and the atomization process of the tobacco oil ends.

[0039] Based on the above embodiments, Figure 1As shown, the switching circuit includes a seventh resistor R7 and a third NMOS transistor MN3. The gate of the third NMOS transistor MN3 is connected to one end of the seventh resistor R7, the source of the third NMOS transistor MN3 is connected to the other end of the seventh resistor R7, and the other end of the seventh resistor R7 is grounded. The drain of the third NMOS transistor MN3 serves as the output terminal of the switching circuit, connected to the atomizer plate. The control terminal of the switching circuit is the gate of the third NMOS transistor MN3, connected to the drive signal conditioning circuit. To improve driving efficiency, the third NMOS transistor MN3 is a high-frequency MOS transistor, allowing the third NMOS transistor MN3 to switch on and off quickly. When the drive signal conditioning circuit provides a high-level signal to the third NMOS transistor MN3, the third NMOS transistor MN3 turns on, connecting the atomizer plate oscillation control circuit and the atomizer plate into a closed circuit. At this time, the oscillation working circuit is connected to a conductive circuit, transmitting driving power to the atomizer plate, causing it to oscillate quickly and atomize the e-liquid. When the drive signal conditioning circuit provides a low-level signal to the third NMOS transistor MN3, the third NMOS transistor MN3 is turned off. The seventh resistor R7 acts as a pull-down resistor, pulling the gate level of the third NMOS transistor MN3 down to ground to maintain the off state. For example, when no PWM signal is applied to the drive signal generating circuit, the switching circuit remains off, and the atomizer is disconnected. Consequently, the atomizer oscillation control circuit and the atomizer cannot form a closed circuit, and driving power is not transmitted to the atomizer, resulting in atomization cessation and time for the MOS transistor in the atomizer oscillation control circuit to dissipate heat. Because the signal frequency input to the trigger input of the drive signal conditioning circuit is the same as the signal frequency output from the conditioning output of the drive signal conditioning circuit, the drive signal conditioning circuit also provides a duty cycle signal to the third NMOS transistor MN3, allowing the drive signal conditioning circuit to periodically control the on and off of the switching circuit. This, by timing the on-time of the switching circuit, limits the temperature rise of discrete components or chip modules, thereby suppressing the impact of temperature on the operation of the atomizer.

[0040] As an example, Figure 1As shown, the boost oscillation circuit includes a linear boost unit, an inductor L, a third capacitor C3, a fourth capacitor C4 and an eighth resistor R8; the input end of the linear boost unit is connected to the power supply component to increase the VCC voltage provided by the power supply component to the driving voltage required for the atomizer to oscillate (for example, reach a resonant state); the output end of the linear boost unit is connected to one end of the inductor L, the other end of the inductor L is connected to one end of the third capacitor C3, the other end of the third capacitor C3 is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is grounded; one end of the eighth resistor R8 is connected between the inductor L and the third capacitor C3 to form an inductor-capacitor network, which constitutes the hardware condition for oscillation; the other end of the eighth resistor R8 is connected to the output end of the switching circuit, and the eighth resistor R8 can serve as a driving resistor to provide sufficient driving current for the atomizer. The output end of the boost oscillation circuit is arranged at the common terminal of the third capacitor C3 and the fourth capacitor C4. Preferably, the positive electrode of the atomizer sheet is connected to the common terminal, and the negative electrode of the atomizer sheet is connected to the output end of the switching circuit. The linear boost unit is a DC boost chip or a resistor-capacitor boost circuit connected to a DC boost chip. Specifically, the DC boost chip is the linear boost unit, or the linear boost unit is composed of a DC boost chip and its peripheral circuits. The DC boost chip is preferably an LM2596 series DC-DC boost chip. The power supply assembly obtains the operating voltage required by the atomizer plate by boosting the voltage through the linear boost unit. During the high-level period of the PWM signal or the high-level period of the output terminal of the drive signal adjustment circuit, the boosted output signal of the linear boost unit sequentially passes through the RC filter network (which can be regarded as the third capacitor C3 and the eighth resistor R8 connected in parallel) and the LC network (which can be regarded as the third capacitor C3 and the inductor L connected in series). Under the drive action of the drive signal generating circuit and the switching circuit, the signal is accelerated to reach a resonant state within the stable pulse width range regulated by the drive signal adjustment circuit. Preferably, the oscillation frequency generated by the boost oscillation circuit can be proportional to the duty cycle of the PWM signal.

[0041] In summary, the aforementioned embodiments are based on improving the driving capability of the atomizer plate for atomization, including increasing the driving voltage and controlling the time for the atomizer plate to be in an oscillation state. In each circuit, at most one resistor-capacitor network and at most one chip module are used to control the oscillation of the atomizer plate, which is not easy to accumulate heat and is easy to achieve miniaturization of the electronic atomizer terminal equipped with an atomizer plate oscillation control circuit. Moreover, in the atomizer plate oscillation control circuit disclosed in the present application, the drive signal generating circuit is used to shape the PWM signal provided by the microcontroller into a stable square wave signal and provide a sufficiently large drive voltage and current to the boost oscillation circuit and the drive signal conditioning circuit, triggering the drive signal conditioning circuit to accelerate the response to the high-level signal or low-level signal output by the drive signal generating circuit, and triggering the drive signal conditioning circuit to generate positive and negative pulse signals of a certain time width, that is, to generate a single output pulse of a specified width, that is, "high" or "low", which not only allows the MOS tube in the switch circuit to conduct to the ground for rapid discharge, but also allows the drive signal conditioning circuit to periodically control the opening and closing of the switch circuit, thereby suppressing the influence of temperature on the operation of the atomizer plate.

[0042] Based on the above embodiments, an electronic atomization terminal is also disclosed, including the atomization plate oscillation control circuit disclosed in the above embodiments. Fewer discrete components are used to speed up the oscillation of the LC network at a higher voltage, overcome the influence of the excessive temperature of the MOS tube, and easily realize the miniaturization of the electronic atomization terminal with the atomization plate oscillation control circuit. Compared with the prior art that uses multiple RC networks and LC networks to perform voltage frequency feedback on a single microcontroller, the present application uses fewer discrete components and smaller-scale chip modules, and makes full use of the transient state of the monostable trigger to stabilize the pulse width adjustment of the high and low levels of the duty cycle to speed up the oscillation of the atomization plate in the closed path, thereby improving the atomization efficiency and cooling effect of the atomization plate.

[0043] Preferably, the electronic atomization terminal can be used as an electronic cigarette.

[0044] The specific working process of the electronic atomization terminal is as follows:

[0045] When a puff is taken (i.e., smoking), switch S1 is opened, triggering the microcontroller to provide the PWM signal to the drive signal generating circuit. The drive signal generating circuit shapes the PWM signal into a stable square wave signal, increasing the power-driving capability of its internal MOS transistor, and then outputs a high-level or low-level signal to the drive signal conditioning circuit. When a high-level signal is input to the drive signal generating circuit, the drive signal conditioning circuit adjusts the input high-level signal to a high-level signal of a specified width and delays the output to the switching circuit to control the internal NMOS transistor to conduct. At this point, the power supply assembly, the drive signal generating circuit, the drive signal conditioning circuit, the switching circuit, the atomizer plate, and the boost oscillation circuit form a conductive oscillating working circuit. This then triggers the atomizer plate to begin oscillating, generating surface elastic waves after oscillating at a specific frequency, thereby atomizing the liquid on the atomizer plate surface. When the drive signal generating circuit inputs a low level, the drive signal regulating circuit regulates the input low level to a low level signal of a specified width, and delays the output to the switching circuit to control the NMOS tube inside it to turn off. At this time, the power supply component, the drive signal generating circuit, the drive signal regulating circuit, the switching circuit, the atomizing plate, and the boost oscillation circuit form a disconnected oscillation working loop; then the atomizing plate is triggered to stop oscillating, and the liquid on the surface of the atomizing plate stops atomizing.

[0046] When there is no puffing action (smoking cessation action), the switch S1 is closed, triggering the microcontroller to stop providing the PWM signal to the drive signal generating circuit. The branch where the sixth resistor R6 is located is short-circuited, and the voltage at the duty cycle enable terminal of the microcontroller is 0, triggering the microcontroller to stop providing the PWM signal to the drive signal generating circuit, thereby cutting off the oscillation working loop. The atomizer plate has no driving voltage and driving frequency, and the atomizer plate stops working, ending the atomization process.

[0047] 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. Atomizer oscillation control circuit, characterized in that: The atomizer oscillation control circuit includes a microcontroller, a drive signal generating circuit, a boost oscillation circuit, a drive signal regulating circuit, a switching circuit and a power supply component; The power supply assembly is connected to one end of the atomizer plate through a drive signal generating circuit, a drive signal regulating circuit, and a switching circuit. The power supply assembly is also connected to the other end of the atomizer plate through a boost oscillation circuit. The duty cycle output of the microcontroller is connected to the signal input of the drive signal generating circuit. The signal output terminal of the driving signal generating circuit is connected to the trigger input terminal of the driving signal regulating circuit, and the regulating output terminal of the driving signal regulating circuit is connected to the control terminal of the switching circuit; One end of the atomizer is connected to the output end of the switch circuit, and the other end of the atomizer is connected to the output end of the boost oscillation circuit; The driving signal generating circuit includes a first resistor, a second resistor, an inverter, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a first PMOS transistor, a first NMOS transistor and a second NMOS transistor; The first input terminal of the inverter is the signal input terminal of the drive signal generating circuit, and the first input terminal of the inverter is connected to the PWM signal output by the microcontroller; The first resistor is connected between the first input terminal of the inverter and the second input terminal of the inverter, and the first input terminal of the inverter is connected to the positive power supply terminal of the inverter through the second resistor; the positive power supply terminal of the inverter is connected to one end of the third resistor, the other end of the third resistor is connected between the first capacitor and the fourth resistor, and the other end of the third resistor is also connected to the power supply component; The power supply component is grounded via a first capacitor, and the drain of the first NMOS transistor is connected to the power supply component via a fourth resistor; The source of the first PMOS transistor is connected to the source of the first NMOS transistor, the gate of the first PMOS transistor is connected to the gate of the first NMOS transistor, the gate of the first NMOS transistor is connected to the output end of the inverter, the drain of the first PMOS transistor is grounded, the drain of the second NMOS transistor is connected between the source of the first PMOS transistor and the source of the first NMOS transistor, the drive signal generating circuit is connected to the drive signal regulating circuit through the second NMOS transistor, wherein the signal output end of the drive signal generating circuit is the source of the second NMOS transistor; The microcontroller supports modulating an AC signal or a DC signal into a PWM signal and outputting the PWM signal from a duty cycle output terminal; The power supply component is used to provide a DC signal or an AC signal to the driving signal generating circuit, the boost oscillation circuit, and the driving signal regulating circuit respectively.

2. The atomizer oscillation control circuit according to claim 1, characterized in that: The driving signal adjustment circuit includes a monostable trigger chip, a second capacitor and a fifth resistor; The upper edge trigger input terminal of the monostable trigger chip is connected to the source of the second NMOS transistor, and the lower edge trigger input terminal of the monostable trigger chip and the ground terminal of the monostable trigger chip are both grounded; The reset terminal of the monostable trigger chip and the power supply terminal of the monostable trigger chip are both connected to the power supply component; One end of a fifth resistor is connected to the power supply assembly, the other end of the fifth resistor is connected to one end of the second capacitor, the other end of the second capacitor is grounded, the fifth resistor is connected between the power supply terminal of the monostable trigger chip and the external resistor terminal of the monostable trigger chip, and the second capacitor is connected between the external resistor terminal of the monostable trigger chip and the external capacitor terminal of the monostable trigger chip; The trigger input terminal of the driving signal regulating circuit is the upper edge trigger input terminal of the monostable trigger chip, and the output terminal of the monostable trigger chip is the regulating output terminal of the driving signal regulating circuit; Among them, the time constant of the fifth resistor and the second capacitor determines the timing period required for the output end of the monostable trigger chip to generate a level signal with a preset pulse width; the signal frequency input to the trigger input end of the drive signal adjustment circuit is the same as the signal frequency output from the adjustment output end of the drive signal adjustment circuit.

3. The atomizer oscillation control circuit according to claim 2, characterized in that: The drive signal adjustment circuit further includes a sixth resistor and a switch; One end of the sixth resistor is connected to the gate of the second NMOS transistor, and the other end of the sixth resistor is connected to the power supply component; One end of the switch is connected to the gate of the second NMOS tube and the duty cycle enable terminal of the microcontroller at the same time, and the other end of the switch is grounded.

4. The atomizer oscillation control circuit according to claim 3, characterized in that: The switching circuit includes a seventh resistor and a third NMOS transistor. The gate of the third NMOS transistor is connected to one end of the seventh resistor, the source of the third NMOS transistor is connected to the other end of the seventh resistor, and the other end of the seventh resistor is grounded. The drain of the third NMOS transistor is the output end of the switching circuit to be connected to the atomizer plate. The control end of the switching circuit is the gate of the third NMOS transistor to be connected to the drive signal adjustment circuit.

5. The atomizer oscillation control circuit according to claim 1, characterized in that: The boost oscillation circuit includes a linear boost unit, an inductor, a third capacitor, a fourth capacitor and an eighth resistor; The input end of the linear boost unit is connected to the power supply assembly, the output end of the linear boost unit is connected to one end of the inductor, the other end of the inductor is connected to one end of the third capacitor, the other end of the third capacitor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded; one end of the eighth resistor is connected between the inductor and the third capacitor, and the other end of the eighth resistor is connected to the output end of the switching circuit; the output end of the boost oscillation circuit is provided at the common end point of the third capacitor and the fourth capacitor; The linear boost unit is a DC boost chip or a RC boost circuit connected to a DC boost chip.

6. The atomizer oscillation control circuit according to claim 1, characterized in that: The atomizing sheet includes but is not limited to a piezoelectric ceramic sheet; The atomizing plate generates surface elastic waves after oscillating at a certain frequency to atomize the liquid on the surface of the atomizing plate; wherein the certain frequency is generated after the boost oscillation circuit and the switching circuit apply voltage to the atomizing plate.

7. An electronic atomization terminal, characterized in that: The invention comprises the atomizer sheet oscillation control circuit according to any one of claims 1 to 6.

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