CN115778020A

CN115778020A - Atomization piece oscillation control circuit and electronic atomization terminal

Info

Publication number: CN115778020A
Application number: CN202211499234.6A
Authority: CN
Inventors: 姜新桥; 孙荣孟; 邓文拔
Original assignee: Shenzhen Smart Core Technology Co ltd
Current assignee: Shenzhen Smart Core Technology Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-03-14

Abstract

The application discloses an atomization piece oscillation control circuit and an electronic atomization terminal, wherein the atomization piece oscillation control circuit comprises a microcontroller, a driving signal generation circuit, a boosting oscillation circuit, a driving signal adjusting circuit, a switching circuit and a power supply assembly; the power supply assembly is connected with one end of the atomizing sheet sequentially through the driving signal generating circuit, the driving signal adjusting circuit and the switch circuit, the power supply assembly is further connected with the other end of the atomizing sheet through the boosting oscillation circuit, and the duty ratio output end of the microcontroller is connected with the signal input end of the driving signal generating circuit. The signal output end of the driving signal generating circuit is connected with the trigger input end of the driving signal regulating circuit, and the regulating output end of the driving signal regulating circuit is connected with the control end of the switching circuit; one end of the atomizing sheet is connected with the output end of the switch circuit, and the other end of the atomizing sheet is connected with the output end of the boosting oscillation circuit, so that the atomizing sheet generates periodic amplitude.

Description

Atomization piece oscillation control circuit and electronic atomization terminal

Technical Field

The invention relates to the technical field of ultrasonic electronic cigarettes, in particular to an atomizing sheet oscillation control circuit and an electronic atomizing terminal.

Background

The existing ultrasonic electronic cigarette atomization sheet driving circuit can obtain an excitation signal to drive the ultrasonic atomization sheet to oscillate by using a universal capacitor three-point type oscillation circuit and an universal inductor three-point type oscillation circuit, and the ultrasonic atomization sheet driving circuit works under the control of a single transistor, so that the electric quantity driving capability of the transistor in a discrete element form is poor during working, and the temperature of the transistor can rise to the limit temperature of the transistor in a short time and is extremely easy to damage.

In order to improve the driving current and voltage to meet the requirement of the atomization sheet for resonant operation, a plurality of transistors, resistors, capacitors and other discrete devices are distributed in a limited electronic cigarette accommodating space, a detection network and a multi-stage RC filter network are additionally arranged, so that the layout difficulty of discrete components is increased, heat is easily collected, and the miniaturization of the ultrasonic electronic cigarette is difficult to realize.

Disclosure of Invention

The application discloses atomizing piece oscillation control circuit and electronic atomization terminal, including following technical scheme:

the atomization plate oscillation control circuit comprises a microcontroller, a driving signal generation circuit, a boosting oscillation circuit, a driving signal adjusting circuit, a switching circuit and a power supply assembly; the power supply assembly is connected with one end of the atomizing sheet sequentially through the driving signal generating circuit, the driving signal adjusting circuit and the switch circuit, the power supply assembly is further connected with the other end of the atomizing sheet through the boosting oscillation circuit, and the duty ratio output end of the microcontroller is connected with the signal input end of the driving signal generating circuit.

Furthermore, the signal output end of the driving signal generating circuit is connected with the trigger input end of the driving signal adjusting circuit, and the adjusting output end of the driving signal adjusting circuit is connected with the control end of the switch circuit; one end of the atomizing sheet is connected with the output end of the switch circuit, and the other end of the atomizing sheet is connected with the output end of the boosting oscillation circuit.

Furthermore, the driving signal generating circuit comprises a first resistor, a second resistor, a phase 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 driving signal generating circuit, and the first input end of the inverter is connected with the PWM signal output by the microcontroller; the first resistor is connected between the first input end of the phase inverter and the second input end of the phase inverter, and the first input end of the phase inverter is connected with the positive power supply end of the phase inverter through the second resistor; the positive power supply end of the phase inverter is connected with one end of a 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 with the power supply assembly; the power supply assembly is grounded through a first capacitor, and a drain electrode of the first NMOS tube is connected with the power supply assembly through a fourth resistor; the source electrode of the first PMOS tube is connected with the source electrode of the first NMOS tube, the grid electrode of the first PMOS tube is connected with the grid electrode of the first NMOS tube, the grid electrode of the first NMOS tube is connected with the output end of the phase inverter, the drain electrode of the first PMOS tube is grounded, the drain electrode of the second NMOS tube is connected between the source electrode of the first PMOS tube and the source electrode of the first NMOS tube, the driving signal generating circuit is connected to the driving signal regulating circuit through the second NMOS tube, and the signal output end of the driving signal generating circuit is the source electrode of the second NMOS tube.

Further, the driving signal adjusting circuit comprises a monostable trigger chip, a second capacitor and a fifth resistor; the upper edge trigger input end of the monostable trigger chip is connected with the source electrode of the second NMOS tube, and the lower edge trigger input end of the monostable trigger chip and the grounding end of the monostable trigger chip are both grounded; the zero clearing end of the monostable trigger chip and the power supply end of the monostable trigger chip are both connected with the power supply assembly; one end of a fifth resistor is connected with the power supply assembly, the other end of the fifth resistor is connected with one end of a second capacitor, the other end of the second capacitor is grounded, the fifth resistor is connected between the power supply end of the monostable trigger chip and the resistor external connection end of the monostable trigger chip, and the second capacitor is connected between the resistor external connection end of the monostable trigger chip and the capacitor external connection end of the monostable trigger chip; the trigger input end of the driving signal regulating circuit is the upper edge trigger input end of the monostable trigger chip, and the output end of the monostable trigger chip is the regulating output end of the driving signal regulating circuit; the time constants of the fifth resistor and the second capacitor determine a timing period required by the output end of the monostable trigger chip to generate a level signal with a preset pulse width; and the frequency of the signal input by the trigger input end of the driving signal regulating circuit is the same as the frequency of the signal output by the regulating output end of the driving signal regulating circuit.

Further, the driving signal adjusting circuit further comprises a sixth resistor and a switch; one end of the sixth resistor is connected with a grid electrode of the second NMOS tube, and the other end of the sixth resistor is connected with the power supply assembly; one end of the switch is connected with the grid electrode of the second NMOS tube and the duty ratio enabling end of the microcontroller, and the other end of the switch is grounded.

Furthermore, the switch circuit comprises a seventh resistor and a third NMOS tube, a gate of the third NMOS tube is connected with one end of the seventh resistor, a source of the third NMOS tube is connected with the other end of the seventh resistor, the other end of the seventh resistor is grounded, a drain of the third NMOS tube is an output end of the switch circuit to connect the atomizing sheet, and a control end of the switch circuit is a gate of the third NMOS tube to connect the driving signal adjusting circuit.

Further, the boost oscillating circuit comprises a linear boost unit, an inductor, a third capacitor, a fourth capacitor and an eighth resistor; the input end of the linear boosting unit is connected with the power supply assembly, the output end of the linear boosting unit is connected with one end of an inductor, the other end of the inductor is connected with one end of a third capacitor, the other end of the third capacitor is connected with one end of a 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 with the output end of the switch circuit; the output end of the boost oscillating circuit is arranged at the common end point of the third capacitor and the fourth capacitor; the linear boosting unit is a direct current boosting chip or a resistance-capacitance boosting circuit connected with the direct current boosting chip.

Furthermore, the microcontroller is used for modulating an alternating current signal or a direct current signal into a PWM signal and outputting the PWM signal through a duty ratio output end; the power supply assembly is used for respectively providing direct current signals or alternating current signals for the driving signal generating circuit, the boosting oscillation circuit and the driving signal adjusting circuit.

Further, the atomizing sheet includes, but is not limited to, a piezoceramic sheet; the atomization sheet generates surface elastic waves after oscillating at a certain frequency so as to atomize the liquid on the surface of the atomization sheet; wherein, certain frequency is generated after the voltage is applied to the atomizing sheet by the boosting oscillating circuit and the switching circuit.

An electronic atomization terminal comprises the atomization piece oscillation control circuit.

This application is based on improving the driving force to atomizing work, and including improving drive voltage and letting the time that the atomizing piece is in the oscillation state be controllable, in the atomizing piece oscillation control circuit that this application discloses, drive signal generating circuit is used for the PWM signal plastic that microcontroller provided for stable square wave signal to provide enough big drive voltage electric current and give boost oscillation circuit and drive signal regulating circuit, trigger drive signal regulating circuit accelerates the response high level signal or the low level signal of drive signal generating circuit output, and trigger drive signal regulating circuit produces certain time width's positive, negative pulse signal, produces the single output pulse of appointed width promptly, and "high" or "low" promptly, not only lets MOS pipe in the switching circuit switches on to ground fast discharge, lets moreover drive signal regulating circuit controls periodically switching circuit's opening and closing. Therefore, the temperature rise of the discrete component or the chip module is limited by controlling the on time of the switch circuit in a timing mode, and the influence of the temperature on the work of the atomizing plate is restrained.

A linear boosting unit is arranged in the boosting oscillation circuit, the voltage division network formed by discrete resistance elements and the filter network formed by the discrete resistance elements and the discrete capacitance elements are omitted, and a necessary inductance-capacitance network is designed to drive the atomization piece to oscillate at high frequency.

The driving signal regulating circuit is internally provided with a monostable trigger chip, under the triggering action of a duty ratio signal applied externally, a high level signal and a low level signal with a certain time width can be output in turn according to a time constant determined by a resistance-capacitance network consisting of a single capacitor and a single resistor and are carried out in a timing period determined by the time constant, so that the atomization sheet is subjected to oscillation work and stop oscillation work in controllable time (pulse width determined by a resistance capacitor externally connected with the monostable trigger chip), the oscillation signal generated by the boost oscillation circuit and used for driving the atomization sheet is periodically regulated in the form of a monostable trigger, and continuous temperature rise of a related MOS (metal oxide semiconductor) transistor is inhibited on the basis of building the driving signal regulating circuit by using a chip module as much as possible, for example, the temperature rise does not need to be kept continuously in a complete period.

Compared with the prior art, the totem circuit formed by the phase inverter and the pair of MOS tubes is arranged in the driving signal generating circuit, a small number of discrete devices are matched with a single circuit module to obtain a pulse signal with larger driving voltage and more stable, and then the atomization sheet is accelerated to reach a resonance state in a certain time period under the combined action of the driving signal regulating circuit and the boosting oscillation circuit.

In conclusion, the application uses at most one resistance-capacitance network and at most one chip module in each circuit to control the oscillation work of the atomizing plate, so that heat is not easily collected, the influence of overhigh temperature of the MOS tube is overcome, and the miniaturization of the electronic atomizing terminal internally provided with the atomizing plate oscillation control circuit is easily realized.

Drawings

Fig. 1 is a schematic structural diagram of an oscillation control circuit of an atomizing plate according to an embodiment.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As an embodiment, an oscillation control circuit of an atomization plate is disclosed, and as can be seen from fig. 1, the oscillation control circuit of the atomization plate disclosed in this embodiment includes a microcontroller, a driving signal generation circuit, a boost oscillation circuit, a driving signal adjustment circuit, a switch circuit, and a power supply assembly; the power supply assembly is connected with one end of the atomizing sheet sequentially through the driving signal generating circuit, the driving signal adjusting circuit and the switching circuit, and is also connected with the other end of the atomizing sheet through the boosting oscillation circuit, namely the driving signal generating circuit, the driving signal adjusting circuit, the switching circuit and the boosting oscillation circuit are connected between the microcontroller and the atomizing sheet or between the power supply assembly and the atomizing sheet; the driving signal generating circuit, the driving signal adjusting circuit and the switching circuit are connected in series, and the boosting oscillating circuit and the atomizing sheet are connected in series; it can be understood that the boost oscillating circuit is connected in series with the atomizing sheet, and then connected in series with the switching circuit, the driving signal adjusting circuit and the driving signal generating circuit in sequence, and of course, the driving signal generating circuit is connected in series with the driving signal adjusting circuit first, and then connected in series with the switching circuit, the atomizing sheet and the boost oscillating circuit in sequence.

In this embodiment, the oscillation operation circuit of the atomization plate may be a closed circuit formed by passing through the positive electrode of the power supply assembly, the driving signal generation circuit, the driving signal adjustment circuit, the switching circuit, the positive electrode of the atomization plate, the negative electrode of the atomization plate, the boost oscillation circuit, and finally returning to the negative electrode of the power supply assembly in this order. Furthermore, in the present embodiment, the atomization plate oscillation control circuit and the atomization plate are both installed in the housing of the electronic atomization terminal, and the atomization plate oscillation control circuit is preferably installed on the driving circuit substrate inside the housing of the electronic cigarette.

The duty ratio output end of the microcontroller is connected with the signal input end of the driving signal generating circuit, the duty ratio output end of the microcontroller is the signal output end of the microcontroller, under the control of a PWM signal output by the duty ratio output end of the microcontroller, the driving signal generating circuit shapes the PWM signal and adjusts the pulse width through the driving signal adjusting circuit, the on-off of the switch circuit is stably controlled, and whether the atomizing sheet oscillation control circuit controls the atomizing sheet to oscillate and accelerate oscillation starting connection can be understood.

The microcontroller comprises a single chip microcomputer, a microprocessor or a DSP, and is configured to at least support the modulation of an alternating current signal or a direct current signal into a PWM signal and output the PWM signal by a duty ratio output end, wherein the signal to be modulated can be a low-frequency signal, and a high-frequency signal output is formed after modulation so as to receive the adjustment of the driving signal generating circuit and the driving signal adjusting circuit. The power supply assembly is used for respectively providing direct current signals or alternating current signals for the driving signal generating circuit, the boosting oscillation circuit and the driving signal adjusting circuit. The power supply voltage value provided by the power supply component is generally 1.8V, 3.3V or 5V.

In this embodiment, the driving signal adjusting circuit is configured to perform shaping processing on the duty ratio signal output by the driving signal generating circuit, including amplifying, inverting, and the like the PWM signal output by the microcontroller to improve the driving capability (including the driving current and the driving voltage) of the PWM signal, so as to obtain a stable square wave signal; for convenience of control, a signal output end of the driving signal generating circuit is connected with a trigger input end of the driving signal adjusting circuit, so that the trigger input end of the driving signal adjusting circuit receives a more stable square wave signal, and the driving signal adjusting circuit is used for adjusting the pulse width of a duty ratio signal output by the driving signal generating circuit, including the adjustment of the pulse width of a high level signal or a low level signal, so as to adjust the pulse width in a more stable and effective level state; the adjusting output end of the driving signal adjusting circuit is connected with the control end of the switch circuit, the switch circuit is switched on under a high level signal output by the adjusting output end of the driving signal adjusting circuit, the switch circuit is switched off under a low level signal output by the adjusting output end of the driving signal adjusting circuit, wherein the high level signal and the low level signal output by the adjusting output end of the driving signal adjusting circuit are alternately generated during the period that a smoker uses the electronic atomization terminal where the atomization sheet oscillation control circuit is located; one end of the atomization piece is connected with the output end of the switch circuit, the other end of the atomization piece is connected with the output end of the boost oscillation circuit, so that the atomization piece generates periodic amplitude, the MOS tube can be heated up and heated in one time period, and then can be cut off in an adjacent time period to cool and dissipate heat, and the atomization piece can be kept at a fixed working frequency to oscillate in the on-stage of the switch circuit, so that the atomization piece is easy to stabilize in a resonant working state.

In the embodiment, a linear boosting unit is arranged in the boosting oscillating circuit, the use of a voltage division network formed by discrete resistance elements and a filter network formed by discrete resistance elements and discrete capacitance elements is reduced, and an inductance capacitance network necessary for driving the atomizing plate to oscillate at high frequency is designed.

The driving signal regulating circuit is internally provided with a monostable trigger chip, under the triggering action of a duty ratio signal applied externally, a high level signal and a low level signal with a certain time width can be output in turn according to a time constant determined by a resistance-capacitance network consisting of a single capacitor and a single resistor and can be carried out in a timing period determined by the time constant, so that the atomization sheet can carry out oscillation work and stop oscillation work in controllable time (pulse width determined by a resistance capacitor externally connected with the monostable trigger chip), the oscillation signal generated by the boosting oscillation circuit and used for driving the atomization sheet is periodically regulated in the form of the monostable trigger, and the continuous temperature rise of the related MOS transistor is inhibited on the basis of building the driving signal regulating circuit by using a chip module as much as possible, for example, the continuous temperature rise does not need to be kept in a complete period.

It should be noted that, the atomizing sheet includes, but is not limited to, a piezoelectric ceramic sheet; the atomization sheet generates surface elastic waves after oscillating at a certain frequency so as to atomize the liquid on the surface of the atomization sheet; wherein, a certain frequency is generated after the voltage is applied to the atomizing sheet by the boosting oscillating circuit and the switching circuit; when a certain frequency is located at the resonant frequency (resonant frequency), the atomization efficiency of the atomization plate is highest, and after the atomization plate is in a resonant state, the influence of temperature on the working efficiency of the atomization plate is overcome to a certain extent. Specifically, the atomizing sheet may have a piezoelectric element substrate having a comb-shaped electrode pair; when a liquid supply unit provided in the electronic atomization terminal supplies a liquid to be atomized to the piezoelectric element substrate, the piezoelectric element substrate is configured to atomize the liquid by a surface elastic wave generated by applying a voltage to the comb-shaped electrode pair at a high frequency (which may reach a resonance frequency or a resonant frequency). The boost oscillating circuit can supply the required electric power of comb shape electrode pair oscillation, including required voltage of drive atomizing piece oscillation and frequency, simultaneously, drive signal generating circuit, drive signal regulating circuit and switch circuit are as signal of telecommunication break-make and time regulating circuit of drive atomizing piece oscillation for improve the atomizing efficiency of atomizing piece.

In some embodiments, the boost oscillating circuit and the driving signal adjusting circuit may generate a high frequency signal including a high frequency voltage, wherein the high frequency voltage has a periodic amplitude, and the periodic amplitude of the high frequency voltage may describe a sine wave shape, a rectangular wave shape, a triangular wave shape, a sawtooth wave shape, and 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. The voltage boosting oscillation circuit is configured to periodically control a frequency of a voltage applied to the comb-shaped electrode pair under a constraint of the pulse width adjusted by the drive signal adjustment circuit, and is capable of controlling an oscillation frequency of the comb-shaped electrode pair at a resonance frequency; in some oscillation environments, the resonant frequency may change over time, subject to temperature, and the like. The atomization efficiency of the atomizing sheet can be improved by monitoring the output signal of the voltage boosting oscillation circuit and the frequency that changes with the passage of time to control the drive signal generation circuit, the drive signal adjustment circuit, and the switching circuit, including adjusting the pulse width of the high level signal and the pulse width of the low level signal, and then supplying power at the monitored optimum frequency.

As an embodiment, referring to fig. 1, the driving signal generating circuit includes a first resistor R1, a second resistor R2, a phase 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 with 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 with the positive power supply end of the inverter U1 through the second resistor R2; a positive power supply end of the phase inverter U1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected between a first capacitor C1 and a fourth resistor R4, wherein one end of the first capacitor C1 is connected with one end of the fourth resistor R4, and a drain electrode of a first NMOS tube is connected with the other end of the fourth resistor R4; the other end of the third resistor R3 is further connected to the power supply component, that is, the other end of the third resistor R3 is connected to VCC (which may be regarded as a voltage provided by a positive power supply end of the power supply component), and a negative power supply end of the power supply component is grounded.

The power supply assembly is grounded through a first capacitor C1, and the drain electrode of a first NMOS (N-channel metal oxide semiconductor) tube MN1 is connected with the power supply assembly through a fourth resistor R4; the source electrode of the first PMOS tube MP1 is connected with the source electrode of the first NMOS tube MN1, the grid electrode of the first PMOS tube MP1 is connected with the grid electrode of the first NMOS tube MN1, the grid electrode of the first NMOS tube MN1 is connected with the output end of the phase inverter U1, the drain electrode of the first PMOS tube MP1 is grounded, the drain electrode of the second NMOS tube MN2 is connected between the source electrode of the first PMOS tube MP1 and the source electrode of the first NMOS tube MN1, the driving signal generating circuit is connected to the driving signal adjusting circuit through the second NMOS tube MN2, the signal output end of the driving signal generating circuit is the source electrode of the second NMOS tube MN2, the second NMOS tube MN2 is used as a switch tube, the first NMOS tube MN1 and the first NMOS tube MP1 form a totem pole circuit, the voltage driving capability is improved, the phase inverter U1 and the totem pole circuit use the same power supply voltage VCC, and the power supply voltage VCC does not exceed 20V.

In this embodiment, the PWM signal output by the microcontroller is inverted and shaped by the inverter U1 to be a stable square wave signal, and sufficient driving voltage/driving current is provided to drive the totem-pole circuit formed by the first NMOS transistor MN1 and the first PMOS transistor MP1, specifically, the logic of the working principle of the totem-pole is a high level input, and the upper transistor turns on the lower transistor to turn off and output a high level; and a low level is input, the lower tube is connected with the upper tube and is cut off, and the low level is output. The totem pole circuit is of course composed of transistors well known to those skilled in the art; in addition, from the combination of the triodes, the upper tube can also be a PNP type triode, and the collector of the triode can be connected with a transformer to realize the power supply output end of the auxiliary winding.

On the basis of the above embodiment, as shown in fig. 1, the driving signal adjusting circuit includes a monostable flip-flop chip, a second capacitor C2, and a fifth resistor R5; the upper edge trigger input end B of the monostable trigger chip is connected with the source electrode of the second NMOS tube MN2; the lower edge trigger input end A of the monostable trigger chip and the grounding end GND of the monostable trigger chip are grounded; the clear end CLR of the monostable trigger chip and the power supply end VDD of the monostable trigger chip are both connected with the power supply assembly, namely, the power supply assembly is connected with a power supply voltage VCC; one end of a fifth resistor R5 is connected with the power supply assembly, the other end of the fifth resistor R5 is connected with one end of a second capacitor C2, the other end of the second capacitor C2 is grounded, the fifth resistor R5 is connected between a power supply end VDD of the monostable trigger chip and a resistor external terminal REXT of the monostable trigger chip, and the second capacitor C2 is connected between the resistor external terminal REXT of the monostable trigger chip and a capacitor external terminal CEXT of the monostable trigger chip; the trigger input end of the driving signal adjusting circuit is the upper edge trigger input end B of the monostable trigger chip, and the output end Q of the monostable trigger chip is the adjusting output end of the driving signal adjusting circuit; the time constant of the fifth resistor R5 and the second capacitor C2 determines a timing period required by the output Q of the monostable flip-flop chip to generate a level signal with a preset pulse width, including a duration required by a high level signal or a low level signal, which may correspond to an on time or an off time of a transistor or a MOS transistor. The frequency of a signal input by a trigger input end of the driving signal adjusting circuit is the same as the frequency of a signal output by an adjusting output end of the driving signal adjusting circuit, but the voltage input by the trigger input end of the driving signal adjusting circuit is not necessarily the same as the voltage output by the adjusting output end of the driving signal adjusting circuit, and time delay exists between the input signal and the output signal of the driving signal adjusting circuit.

It should be noted that when an appropriate external trigger signal or pulse is applied to the upper edge trigger input B of the monostable flip-flop chip, the output Q of the monostable flip-flop chip is used to generate a single output pulse of a specified width, i.e., a high level signal or a low level signal of a certain time width is output. When an external trigger signal or pulse is applied to the monostable trigger chip, a timing cycle is started, which can be understood as a complete timing cycle which is passed in response to a single pulse signal output by the drive signal generation circuit, the timing cycle causes the output signal of the output end of the monostable trigger chip to change the state at the beginning of the timing cycle, correspondingly changes the on-off state of the switch circuit, and can be kept at a new state on the basis of the change, at least a relatively fixed pulse width can be set, so that the frequency applied by the boost oscillating circuit is kept in the timing cycle for dynamic control, and a resonant frequency can be provided for the oscillating working loop of the atomization plate in a constant time. The timing period is determined by the product of a fifth resistor R5 and a second capacitor C2, and is used for configuring the pulse width output by the driving signal regulating circuit, including the pulse width of the high-level signal or the low-level signal, which is correspondingly the on-time or the off-time of the transistor or the MOS transistor; in addition, the length of the timing period has no relation with the length of the action time of the signal input by the driving signal regulating circuit, and the influence of an external input signal or interference factors carried by the boosting oscillating circuit on the pulse width and the frequency of the PWM signal is reduced.

In some embodiments, the monostable flip-flop chip may comprise a 74LVC1G123 integrated chip. The monostable flip-flop chip can also be implemented with a 555 timer. The monostable flip-flop chip can produce a very short pulse or longer rectangular waveform whose leading edge rises with time with an externally applied trigger pulse and whose trailing edge depends on the RC time constant of the feedback component used, which RC time constant will be timed to produce a series of controlled fixed time delays relative to the original trigger pulse; alternatively, the monostable flip-flop can produce a very short pulse or longer rectangular waveform, the leading edge of which rises with time with an externally applied trigger pulse and the trailing edge of which depends upon the RC time constant of the feedback component used, which RC time constant will vary with time to produce a series of controlled fixed time delays relative to the original trigger pulse.

On the basis of the above embodiment, as shown in fig. 1, the driving signal adjusting circuit further includes a sixth resistor R6 and a switch S1; one end of the sixth resistor R6 is connected with the grid electrode of the second NMOS transistor MN2, the other end of the sixth resistor R6 is connected with the power supply assembly, namely the other end of the sixth resistor R6 is connected with a power supply voltage VCC; one end of the switch S1 is connected with the grid electrode of the second NMOS tube MN2, one end of the switch S1 is simultaneously connected with the grid electrode of the second NMOS tube MN2 and the duty ratio enabling end of the microcontroller, and the other end of the switch S1 is grounded, wherein the switch S1 is equivalent to a switch which is connected in series between the driving signal generating circuit and the monostable trigger chip and is used for controlling the on-off of an oscillation working circuit which is composed of the power supply assembly, the driving signal generating circuit, the driving signal adjusting circuit, the switch circuit, the atomization piece and the boosting oscillation circuit.

The atomization piece oscillation control circuit and the atomization piece are arranged in the electronic cigarette, the switch S1 is triggered to be switched on or off according to the smoking operation of a user, the specific form of the switch S1 can be a mechanical key switch or an air pressure sensor, namely, the switch S1 supports manual pressing or automatically induces airflow change to detect whether the smoking action occurs. When a smoker starts smoking, the switch S1 is switched off, the voltage at the duty ratio enabling end of the microcontroller is the power supply voltage VCC and is divided by the sixth resistor R6, the voltage at the duty ratio enabling end of the microcontroller is at a high level, the microcontroller is triggered to provide the PWM signal for the driving signal generating circuit, so that the driving voltage and the frequency required by oscillation are provided for the atomizing sheet, and the atomizing sheet generates surface elastic waves after oscillating at a certain frequency so as to atomize the liquid on the surface of the atomizing sheet. When a smoker stops smoking, the switch S1 is closed, the branch where the sixth resistor R6 is located is short-circuited, the voltage at the duty ratio enabling end of the microcontroller is 0, the microcontroller is triggered to stop providing the PWM signal for the driving signal generating circuit, so that the oscillation working circuit is cut off, the atomizing sheet stops working, and the tobacco tar atomizing process is finished.

On the basis of the above embodiment, as shown in fig. 1, the switch circuit includes a seventh resistor R7 and a third NMOS transistor MN3, a gate of the third NMOS transistor MN3 is connected to one end of the seventh resistor R7, a source of the third NMOS transistor MN3 is connected to the other end of the seventh resistor R7, the other end of the seventh resistor R7 is grounded, a drain of the third NMOS transistor MN3 is an output terminal of the switch circuit to connect the atomizing sheet, and a control terminal of the switch circuit is a gate of the third NMOS transistor MN3 to connect the driving signal adjusting circuit, wherein, in order to improve driving efficiency, the third NMOS transistor MN3 employs a high-frequency MOS transistor to rapidly turn on and off the third NMOS transistor MN 3. When drive signal regulating circuit provides high level signal for third NMOS pipe MN3, third NMOS pipe MN3 switches on, will atomizing piece oscillation control circuit and atomizing piece are connected into closed access, and at this moment, the oscillation work return circuit connects into the return circuit that switches on, will drive electric energy and transmit the atomizing piece, makes its quick start vibration, atomizes the tobacco tar. When the driving signal adjusting circuit provides a low level signal for the third NMOS transistor MN3, the third NMOS transistor MN3 is turned off, the seventh resistor R7 is used as a pull-down resistor, so that the gate level of the third NMOS transistor MN3 is pulled down and conducted to the ground to keep a cut-off state, for example, when no PWM signal is added to the driving signal generating circuit, the switch circuit is kept turned off, the atomizing sheet is changed to a cut-off state, the atomizing sheet oscillation control circuit and the atomizing sheet cannot form a closed passage, the driving electric energy is not transmitted to the atomizing sheet, the atomization is stopped, and the reserved time is used for heat dissipation of the MOS transistor in the atomizing sheet oscillation control circuit. Because the frequency of the signal input by the trigger input end of the driving signal regulating circuit is the same as the frequency of the signal output by the regulating output end of the driving signal regulating circuit, the driving signal regulating circuit provides a duty ratio signal for the third NMOS transistor MN3, and the driving signal regulating circuit periodically controls the on and off of the switch circuit, so that the temperature rise of a discrete element or a chip module is limited by controlling the on time of the switch circuit in a timing manner, and the influence of the temperature on the work of the atomizing sheet is inhibited.

As an embodiment, as shown in fig. 1, the boost oscillating 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 boosting unit is connected with the power supply assembly so as to boost VCC voltage provided by the power supply assembly to driving voltage required by the atomization plate to oscillate (for example, reach a resonance state); the output end of the linear boosting unit is connected with one end of an inductor L, the other end of the inductor L is connected with one end of a third capacitor C3, the other end of the third capacitor C3 is connected with one end of a fourth capacitor C4, and the other end of the fourth capacitor C4 is grounded; one end of an eighth resistor R8 is connected between the inductor L and the third capacitor C3 to form an inductor-capacitor network, so that a hardware condition for starting oscillation is formed; the other end of the eighth resistor R8 is connected with the output end of the switch circuit, and the eighth resistor R8 can be used as a driving resistor to provide enough driving current for the atomizing sheet. The output end of the boost oscillating circuit is arranged at a common end point of a third capacitor C3 and a fourth capacitor C4, preferably, the anode of the atomization sheet is connected with the common end point, and the cathode of the atomization sheet is connected with the output end of the switch circuit; the linear boosting unit is a direct-current boosting chip or a resistance-capacitance boosting circuit connected with the direct-current boosting chip; specifically, the direct current boost chip is the linear boost unit, or the linear boost unit is composed of a direct current boost chip and a peripheral circuit thereof, and the direct current boost chip is preferably an LM2596 series DC-DC boost chip. The power supply assembly obtains the working voltage required by the atomizing sheet through the voltage boosting of the linear voltage boosting unit, during the high level of the PWM signal or during the high level generated at the output end of the driving signal regulating circuit, the signal boosted and output by the linear voltage boosting unit sequentially passes through an RC filter network (which can be regarded as the parallel connection of a third capacitor C3 and an eighth resistor R8) and an LC network (which can be regarded as the series connection of the third capacitor C3 and an inductor L), and under the driving action of the driving signal generating circuit and the switching circuit, the signal is accelerated to reach a resonance state within the range of the stable pulse width generated by the driving signal regulating circuit, preferably, the oscillation frequency generated by the voltage boosting oscillation circuit can be in a proportional relation with the duty ratio of the PWM signal.

In summary, the foregoing embodiments are based on the idea that the driving capability of the atomization chip is improved, including that the time for increasing the driving voltage and enabling the atomization chip to be in the oscillation state is controllable, and at most one resistance-capacitance network and at most one chip module are used in each circuit to control the oscillation operation of the atomization chip, so that heat collection is not easy, and miniaturization of the electronic atomization terminal in which the atomization chip oscillation control circuit is disposed is easy to achieve. Moreover, in the atomization plate oscillation control circuit disclosed in the application, the driving signal generating circuit is used for shaping the PWM signal provided by the microcontroller into a stable square wave signal, and providing a driving voltage and a driving current which are large enough to the boost oscillating circuit and the driving signal regulating circuit, triggering the driving signal regulating circuit to accelerate the response of the high level signal or the low level signal output by the driving signal generating circuit, and triggering the driving signal regulating circuit to generate positive and negative pulse signals with a certain time width, i.e. generating a single output pulse with a specified width, i.e. "high" or "low", so that not only the MOS transistor in the switching circuit is conducted to the ground for rapid discharge, but also the driving signal regulating circuit periodically controls the switching circuit to be turned on and off, and the influence of the temperature on the work of the atomization plate is suppressed.

Based on the foregoing embodiment, an electronic atomization terminal is further disclosed, which includes the atomization sheet oscillation control circuit disclosed in the foregoing embodiment. The electronic atomization terminal has the advantages that the LC network is accelerated to be driven to oscillate under high voltage by adopting fewer discrete elements, the influence of overhigh temperature of the MOS tube is overcome, and the miniaturization of the electronic atomization terminal internally provided with the atomization sheet oscillation control circuit is easily realized. Compared with the prior art in which a plurality of RC networks and LC networks are used for feeding back voltage and frequency to a single microcontroller, the single-chip-based atomization device has the advantages that fewer discrete elements and a smaller-scale chip module are adopted, and the transient state of the monostable trigger is fully utilized to stabilize the pulse width adjustment of the high and low levels of the duty ratio so as to accelerate the atomization sheet to start oscillation in a closed passage, so that the atomization efficiency and the cooling effect of the atomization sheet are improved.

Preferably, the electronic vaping terminal may be used as an electronic cigarette.

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

when a pumping action (a smoking action) exists, the switch S1 is switched off, the microcontroller is triggered to provide the PWM signal for the driving signal generating circuit, the driving signal generating circuit shapes the PWM signal into a stable square wave signal and improves the electric quantity driving capability of an MOS (metal oxide semiconductor) tube arranged in the square wave signal, and then a high-level signal or a low-level signal is output to the driving signal adjusting circuit. When the driving signal generating circuit inputs a high level, the driving signal adjusting circuit adjusts the input high level into a high level signal with a specified width, and delays and outputs the high level signal to the switching circuit to control the conduction of an NMOS tube in the switching circuit, and at the moment, the power supply assembly, the driving signal generating circuit, the driving signal adjusting circuit, the switching circuit, the atomizing sheet and the boosting oscillating circuit form a conducted oscillation working loop, namely a conducted loop; and then triggering the atomization plate to start oscillation, wherein the atomization plate generates surface elastic waves after oscillating at a certain frequency so as to atomize the liquid on the surface of the atomization plate. When the driving signal generating circuit inputs a low level, the driving signal adjusting circuit adjusts the input low level into a low level signal with a specified width, and delays and outputs the low level signal to the switching circuit to control the NMOS tube in the switching circuit to be turned off, and at the moment, the power supply assembly, the driving signal generating circuit, the driving signal adjusting circuit, the switching circuit, the atomizing sheet and the boosting oscillation circuit form a disconnected oscillation working loop; and then triggering the atomizing plate to stop oscillation, wherein the liquid on the surface of the atomizing plate is not atomized continuously.

When the smoking action does not exist (the smoking action is stopped), the switch S1 is closed, the microcontroller is triggered to stop providing the PWM signal for the driving signal generating circuit, the branch where the sixth resistor R6 is located is short-circuited, the voltage at the duty ratio enabling end of the microcontroller is 0, the microcontroller is triggered to stop providing the PWM signal for the driving signal generating circuit, so that the oscillation working circuit is cut off, the atomization piece does not drive the voltage pressing driving frequency, the atomization piece stops working, and the atomization process is ended.

The above-described embodiments of the apparatus are merely schematic, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Claims

1. The atomization plate oscillation control circuit is characterized by comprising a microcontroller, a driving signal generating circuit, a boosting oscillation circuit, a driving signal adjusting circuit, a switching circuit and a power supply assembly;

the power supply assembly is connected with one end of the atomizing sheet sequentially through the driving signal generating circuit, the driving signal adjusting circuit and the switch circuit, the power supply assembly is further connected with the other end of the atomizing sheet through the boosting oscillation circuit, and the duty ratio output end of the microcontroller is connected with the signal input end of the driving signal generating circuit.

2. The atomization plate oscillation control circuit of claim 1, wherein a signal output end of the driving signal generation circuit is connected with a trigger input end of the driving signal regulation circuit, and a regulation output end of the driving signal regulation circuit is connected with a control end of the switch circuit;

one end of the atomization piece is connected with the output end of the switch circuit, and the other end of the atomization piece is connected with the output end of the boost oscillation circuit.

3. The oscillating control circuit of claim 2, wherein the driving signal generating circuit comprises 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 phase inverter is the signal input end of the driving signal generating circuit, and the first input end of the phase inverter is connected to the PWM signal output by the microcontroller;

the first resistor is connected between the first input end of the phase inverter and the second input end of the phase inverter, and the first input end of the phase inverter is connected with the positive power supply end of the phase inverter through the second resistor; the positive power supply end of the phase inverter is connected with one end of a third resistor, the other end of the third resistor is connected between the first capacitor and a fourth resistor, and the other end of the third resistor is also connected with the power supply assembly;

the power supply assembly is grounded through a first capacitor, and a drain electrode of the first NMOS tube is connected with the power supply assembly through a fourth resistor;

the source electrode of the first PMOS tube is connected with the source electrode of the first NMOS tube, the grid electrode of the first PMOS tube is connected with the grid electrode of the first NMOS tube, the grid electrode of the first NMOS tube is connected with the output end of the phase inverter, the drain electrode of the first PMOS tube is grounded, the drain electrode of the second NMOS tube is connected between the source electrode of the first PMOS tube and the source electrode of the first NMOS tube, the driving signal generating circuit is connected to the driving signal regulating circuit through the second NMOS tube, and the signal output end of the driving signal generating circuit is the source electrode of the second NMOS tube.

4. The atomizing plate oscillation control circuit of claim 3, wherein the driving signal regulating circuit comprises a monostable trigger chip, a second capacitor and a fifth resistor;

the upper edge trigger input end of the monostable trigger chip is connected with the source electrode of the second NMOS tube, and the lower edge trigger input end of the monostable trigger chip and the grounding end of the monostable trigger chip are both grounded;

the zero clearing end of the monostable trigger chip and the power supply end of the monostable trigger chip are both connected with the power supply assembly;

one end of a fifth resistor is connected with the power supply assembly, the other end of the fifth resistor is connected with one end of a second capacitor, the other end of the second capacitor is grounded, the fifth resistor is connected between the power supply end of the monostable trigger chip and the resistor external connection end of the monostable trigger chip, and the second capacitor is connected between the resistor external connection end of the monostable trigger chip and the capacitor external connection end of the monostable trigger chip;

the trigger input end of the driving signal regulating circuit is the upper edge trigger input end of the monostable trigger chip, and the output end of the monostable trigger chip is the regulating output end of the driving signal regulating circuit;

the time constants of the fifth resistor and the second capacitor determine a timing period required by the output end of the monostable trigger chip to generate a level signal with a preset pulse width; and the frequency of the signal input by the trigger input end of the driving signal regulating circuit is the same as the frequency of the signal output by the regulating output end of the driving signal regulating circuit.

5. The wobble control circuit of claim 4, wherein the driving signal adjustment circuit further comprises a sixth resistor and a switch;

one end of the sixth resistor is connected with the grid electrode of the second NMOS tube, and the other end of the sixth resistor is connected with the power supply assembly;

one end of the switch is connected with the grid electrode of the second NMOS tube and the duty ratio enabling end of the microcontroller, and the other end of the switch is grounded.

6. The oscillating control circuit of claim 5, wherein the switch circuit comprises a seventh resistor and a third NMOS transistor, a gate of the third NMOS transistor is connected to one end of the seventh resistor, a 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, a drain of the third NMOS transistor is an output terminal of the switch circuit to connect the atomizing sheet, and a control terminal of the switch circuit is a gate of the third NMOS transistor to connect the driving signal adjusting circuit.

7. The atomization plate oscillation control circuit of claim 2, wherein the boost oscillation circuit comprises a linear boost unit, an inductor, a third capacitor, a fourth capacitor and an eighth resistor;

the input end of the linear boosting unit is connected with the power supply assembly, the output end of the linear boosting unit is connected with one end of an inductor, the other end of the inductor is connected with one end of a third capacitor, the other end of the third capacitor is connected with one end of a 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 with the output end of the switch circuit; the output end of the boost oscillating circuit is arranged at the common end point of the third capacitor and the fourth capacitor;

the linear boosting unit is a direct current boosting chip or a resistance-capacitance boosting circuit connected with the direct current boosting chip.

8. The atomizing plate oscillation control circuit of claim 2, wherein the microcontroller is used for modulating an alternating current signal or a direct current signal into a PWM signal and outputting the PWM signal from a duty ratio output end;

the power supply assembly is used for respectively providing direct current signals or alternating current signals for the driving signal generating circuit, the boosting oscillation circuit and the driving signal adjusting circuit.

9. The wobble control circuit of claim 8, wherein the wobble plate comprises but is not limited to a piezoceramic plate;

the atomization sheet generates surface elastic waves after oscillating at a certain frequency so as to atomize the liquid on the surface of the atomization sheet; wherein, certain frequency is generated after the voltage is applied to the atomizing plate by the boosting oscillating circuit and the switching circuit.

10. An electronic atomizing terminal characterized by comprising the atomizing plate oscillation control circuit according to any one of claims 1 to 9.