Heating circuit of electronic atomizer and heating method thereof

Abstract

The invention discloses a heating circuit of an electronic atomizer and a heating method thereof. The heating circuit comprises a power supply, a first switch element, a second switch element, an energy storage element, a load and a control element, the first end of the first switch element is connected with the output end of the power supply; the second end of the second switch element is connected with the grounding end; one end of the energy storage element is connected with the second end of the first switch element, and the other end of the energy storage element is connected with the first end of the second switch element; the load is connected with the second switch element in parallel, one end of the load is connected with the first end of the second switch element, and the other end of the load is connected with the second end of the second switch element; the control element is connected with the third end of the first switch element and the third end of the second switch element, and the control element is used for controlling the turn-off of the first switch element and the second switch element. On-off of the two switching tubes is controlled through the control element, accurate control over inductor energy storage and energy release is achieved, and then power output of the heating load is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic atomizers and relates to a heating circuit of an electronic atomizer and a heating method thereof. Background Art

[0002] Existing electronic cigarettes generally use batteries to directly drive the heating wire to heat the e-liquid. This method is difficult to output high power at low voltage, resulting in slow heating speed and poor heating uniformity, which affects user experience. Some electronic cigarettes try to increase the voltage through a boost circuit, but the traditional boost method is complex in design, low in efficiency, and lacks precise control of load power. Therefore, there is an urgent need for a solution that can both increase the heating power and simplify the circuit design. Summary of the invention

[0003] The present invention provides a heating circuit and a heating method for an electronic atomizer, controls the on-off of two switch tubes through a control element, realizes precise control of inductive energy storage and energy release, and thus improves the power output of the heating load.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A heating circuit for an electronic atomizer comprises a power supply, a first switch element, a second switch element, an energy storage element, a load and a control element; The first end of the first switch element is connected to the output end of the power supply; The second end of the second switch element is connected to the ground end; One end of the energy storage element is connected to the second end of the first switch element, and the other end of the energy storage element is connected to the first end of the second switch element; The load and the second switch element are connected in parallel, one end of the load is connected to the first end of the second switch element, and the other end of the load is connected to the second end of the second switch element; The control element is connected to the third end of the first switch element and the third end of the second switch element respectively, and the control element is used to control the turn-off of the first switch element and the second switch element.

[0005] Furthermore, it also includes a sampling resistor; the sampling resistor is connected in parallel with the load, one end of the sampling resistor is connected to the second end of the second switch element and the control element, and the other end of the sampling resistor is connected to the ground end.

[0006] Furthermore, it also includes a first capacitor, one end of the first capacitor is connected between the first switch element and the energy storage element, and the other end of the first capacitor is connected to the ground.

[0007] Furthermore, it also includes a first resistor, one end of the first resistor is connected to the output end of the power supply, and the other end of the first resistor is connected between the first switch element and the control element.

[0008] Furthermore, it also includes a second resistor, one end of the second resistor is connected between the second switch element and the control element, and the other end of the second resistor is connected to the ground.

[0009] Furthermore, the first switch element is a PMOS tube, and the second switch element is an NMOS tube; The source of the first switch element is connected to the output end of the power supply; The source of the second switch element is connected to the ground terminal; One end of the energy storage element is connected to the drain of the first switch element, and the other end of the energy storage element is connected to the drain of the second switch element; The load and the second switch element are connected in parallel, one end of the load is connected to the drain of the second switch element, and the other end of the load is connected to the source of the second switch element; The control element is connected to the gate of the first switch element and the gate of the second switch element respectively, and the control element is used to control the turn-off of the first switch element and the second switch element.

[0010] A heating method for an electronic atomizer, applied to a heating circuit of the electronic atomizer, is characterized by comprising the following steps: The control element collects the load current and output voltage and calculates the load power; Set target power and calculate power error; Using PID control algorithm, a new adjustment duty cycle is calculated according to the power error; By adjusting the duty cycle, the release time can be changed.

[0011] Furthermore, the step of changing the release time by adjusting the duty cycle includes: If the power error is greater than 0, increase the duty cycle and shorten the release time; If the power error is less than 0, the duty cycle is reduced and the release time is extended.

[0012] Beneficial effects of the present invention: The present application achieves precise management of energy storage and energy release of energy storage elements (such as inductors) by precisely controlling the on and off of the first switch element and the second switch element through a control element. In the energy release stage, the self-induced electromotive force generated by the inductor is superimposed on the power supply voltage, and the output voltage is increased, so that the load (such as the heating wire) works at a higher voltage, thereby obtaining a higher power drive, effectively improving the heating power, and solving the problem that the existing electronic cigarette is difficult to output high power at low voltage, slow heating speed, and poor heating uniformity. At the same time, the frequency and time of energy storage and release are reasonably adjusted, the energy storage of the inductor is increased, more energy is released to the load, and the time length of the release stage is controlled to avoid output overvoltage or load overheating, thereby improving the energy utilization efficiency, enabling the circuit to maintain stable performance under different load conditions, and further improving the heating effect. Compared with the traditional method of using a boost circuit to increase the voltage, the present invention does not require a complex boost circuit design, and directly controls the switch element and the energy storage element to achieve effective energy transmission and conversion, simplifies the circuit structure, reduces the design difficulty and cost, and also helps to improve the reliability and stability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the heating method flow of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. It should be understood that the present application is not limited to the example embodiments disclosed herein. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0016] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0018] In the embodiments of 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The present invention provides Figures 1-2 In an embodiment of the present invention, a heating circuit of an electronic atomizer includes a power supply, a first switching element Q1, a second switching element Q2, an energy storage element L, a load R1 and a control element; A first end of the first switch element Q1 is connected to an output end of the power supply; The second end of the second switch element Q2 is connected to the ground end; One end of the energy storage element L is connected to the second end of the first switch element Q1, and the other end of the energy storage element L is connected to the first end of the second switch element Q2; The load R1 and the second switch element Q2 are connected in parallel, one end of the load R1 is connected to the first end of the second switch element Q2, and the other end of the load R1 is connected to the second end of the second switch element Q2; The control element is connected to the third end of the first switch element Q1 and the third end of the second switch element Q2 respectively, and the control element is used to control the turn-off of the first switch element Q1 and the second switch element Q2.

[0020] The first switch element Q1 and the second switch element Q2 may be MOS tubes, the energy storage element L may be an inductor, and the control element may be an MCU (micro control unit). The circuit uses an inductor as an energy storage element L, and controls the switching of the first switch element Q1 and the second switch element Q2 through the MCU to achieve energy storage and energy release of the inductor.

[0021] Specifically, it can be divided into the following two stages: 1. Energy storage stage, at this time, the first switch element Q1 and the second switch element Q2 are turned on, the power supply (VBAT in the figure), the first switch element Q1, the inductor and the second switch element Q2 form a loop and start energy storage; When the second switch element Q2 is turned on, the power supply provides current to the inductor through the first switch element Q1. According to the inductor current growth formula ;in, is the input voltage of the battery, is the inductance value of the inductor, is the inductor current at the end of energy storage; The current in the inductor increases linearly with time, storing magnetic field energy, and the stored energy is ; The control element controls the on-time of the second switch through a PWM signal to determine the inductor energy storage amount. Prolonging the on-time of the second switch increases the inductor energy storage amount, while shortening the on-time of the second switch reduces the inductor energy storage amount.

[0022] 2. Energy release stage, at this time, the first switch element Q1 is turned on, the second switch element Q2 is turned off, and the inductor releases energy through the load R1; When the second switch element Q2 is turned off, the current in the inductor cannot change instantly, the magnetic field energy stored in it is released, the self-induced electromotive force generated by the inductor is superimposed on the power supply voltage, and the output voltage increases; The output voltage is ; At this time, the load R1 works under the boosted voltage to obtain higher power drive, that is, ; The control element adjusts the frequency and time of energy storage and release through the PWM signal, adjusts the PWM duty cycle, increases the energy storage of the inductor, releases more energy to the load R1, controls the length of the release phase, and avoids output overvoltage or overheating of the load R1.

[0023] More specifically, through the alternating operation of the above two stages, the power of load R1 can be increased in the following way: Increasing the input voltage and raising the battery voltage can be understood as increasing the input voltage directly increasing the inductor energy storage and output power; Prolong the energy storage time and increase the on-time of the second switch element Q2 so that the inductor can store more energy; Optimize the release time to ensure that the inductor energy is fully released and improve the energy utilization of the load R1; Increasing the PWM frequency increases the number of cycles of energy storage and release, and improves the average power output.

[0024] Furthermore, in order to more clearly understand how to increase the power of the load R1, the following more specific embodiments may be referred to: Assumptions, power supply voltage ,inductance , load R1 (heating wire resistance) , PWM frequency , duty cycle ; 1. Energy storage calculation (second switch element Q2 is turned on) Inductor energy storage time (on time) ; Inductor current peak ; Energy storage ; 2. Release calculation (second switch element Q2 is turned off) In the release phase, the energy stored in the inductor is completely released to the load R1, and the output voltage and load R1 power Determined by: Load R1 power ; Energy consumption of load R1 ; Combining the above formula, the output voltage can be obtained ; Assuming release time , substitute into the formula ; Calculated ; From the above, we can see that the output voltage is very low and the release time is too long. In order to achieve high voltage, a shorter release time is required; If you want the output voltage to reach , assuming the target output voltage is , then the release time can be recalculated ; Substitution , , ; Calculated ; Load R1 power ; In summary, the power increase of load R1 can be controlled by the control element, and its control algorithm includes dynamically adjusting the on-time of the switch tube by detecting the current or voltage of load R1, limiting the duration of the release phase through a preset time window (such as a fixed PWM duty cycle), and calculating the release time in real time according to the target output power or voltage to ensure power stability.

[0025] For example, if the goal is to maintain a fixed output voltage , the MCU will monitor the load R1 voltage in real time, calculate the required release time and adjust the switch state. , the MCU will adjust the on-time of the second switch element Q2 in combination with the feedback signal to control the energy release rate.

[0026] Also includes a sampling resistor RS1; The sampling resistor RS1 is connected in parallel with the load R1 , one end of the sampling resistor RS1 is connected to the second end of the second switch element Q2 and the control element, and the other end of the sampling resistor RS1 is connected to the ground.

[0027] In the heating circuit of the electronic atomizer, the sampling resistor RS1 is a key feedback element, which is connected in parallel with the load R1. This connection method enables the sampling resistor to sense the current flowing through the load without significantly changing the overall characteristics of the circuit. Specifically, one end of the sampling resistor RS1 is connected to the second end of the second switching element Q2 and is also connected to the control element; the other end is connected to the ground terminal. This connection method enables the sampling resistor to form a current shunt path with the load, so that when the load is working, a voltage drop proportional to the load current will be generated on the sampling resistor.

[0028] When the circuit is working, the power supply provides energy to the load R1 through the first switching element Q1 and the energy storage element L. In the energy release stage, the inductor L releases energy through the load R1, and the current flowing through the load R1 will also pass through the sampling resistor RS1. According to Ohm's law, the voltage drop across the sampling resistor RS1 is proportional to the current flowing through it, that is, V = I × RS1, where V is the voltage across the sampling resistor, I is the current flowing through the sampling resistor, and RS1 is the resistance of the sampling resistor. Therefore, by detecting the voltage across the sampling resistor RS1, the control element (such as a microcontroller MCU) can indirectly calculate the current of the load R1.

[0029] The core purpose of this design is to provide real-time current feedback signals for the control element, so as to achieve dynamic adjustment and optimization of the output power. For example, when the current of the load R1 is too high, the control element can reduce the energy release rate of the energy storage element by adjusting the on-time of the switch element (such as changing the PWM duty cycle), thereby reducing the output power and protecting the safety of the load and circuit. On the contrary, when the load current is low, the control element can increase the load power to meet the working requirements by extending the energy storage time or reducing the release time.

[0030] In addition, the introduction of sampling resistor RS1 has other important technical advantages. First, it can improve the stability and reliability of the circuit. By monitoring the load current in real time, the control element can quickly respond to changes in the load to avoid circuit failure or performance degradation caused by excessive or insufficient current. Second, the feedback mechanism of sampling resistor RS1 can optimize the energy efficiency of the circuit. By precisely controlling the release of energy, the circuit can maintain stable performance under different load conditions while reducing energy waste and improving overall efficiency.

[0031] In practical applications, the resistance of the sampling resistor RS1 needs to be optimized and selected according to the specific needs of the circuit. A resistance value that is too large will cause a large voltage drop on the sampling resistor, affecting the efficiency of the circuit; a resistance value that is too small may not provide sufficient signal strength for detection by the control element. Therefore, a suitable resistance range is usually selected to strike a balance between signal detection and circuit efficiency. For example, for the heating circuit of an electronic atomizer, the resistance of the sampling resistor RS1 may be between the milliohm and ohm levels, and the specific value depends on the current range of the load R1 and the detection accuracy requirements of the control element. In this embodiment, the resistance value of the sampling resistor RS1 is 0.05Ω.

[0032] In summary, the sampling resistor RS1 plays an important role in the electronic atomizer heating circuit. It not only provides a real-time current feedback signal for the control element, realizes the precise control of the heating power, but also improves the stability and energy efficiency of the circuit. By reasonably designing the connection mode and resistance value of the sampling resistor RS1, this technical solution can effectively support the efficient and reliable operation of the electronic atomizer heating circuit and meet the working requirements under different load conditions.

[0033] The device further comprises a first capacitor C1 , one end of which is connected between the first switch element Q1 and the energy storage element L, and the other end of which is connected to a ground terminal.

[0034] In the electronic atomizer heating circuit of the present invention, the introduction of the first capacitor C1 is to optimize the performance of the circuit, especially to play a key role in improving the stability of the circuit and reducing voltage fluctuations. The first capacitor C1 is connected between the first switching element Q1 and the energy storage element L, and the other end thereof is grounded. This configuration enables the first capacitor C1 to effectively filter out high-frequency noise and transient voltage fluctuations in the circuit. When the circuit is working, the power supply provides energy to the energy storage element L (such as an inductor) through the first switching element Q1. In this process, due to the rapid switching of the switching element, high-frequency noise and voltage spikes may be generated in the circuit. If these noises and spikes are not controlled, they may have a negative impact on the stability and performance of the circuit, such as causing the control element to malfunction or damage, affecting the heating effect of the load R1. The first capacitor C1 can absorb these transient voltage fluctuations through its charging and discharging characteristics. When a voltage spike appears in the circuit, the first capacitor C1 will charge quickly, absorb excess electrical energy, and thus smooth the voltage waveform. On the contrary, when the voltage drops briefly, the first capacitor C1 will discharge, replenish electrical energy, and maintain voltage stability. This filtering effect helps to maintain the stability of the voltage in the circuit, ensuring that the control element can accurately control the switching action of the switching element, and then accurately control the energy storage and energy release process of the inductor. In addition, the first capacitor C1 can also improve the power factor of the circuit. In the switching power supply circuit, due to the nonlinear characteristics of the switching element, the input current waveform may be out of sync with the voltage waveform, thereby reducing the power factor. The presence of the first capacitor C1 can improve this situation, making the input current waveform closer to a sine wave, improving the power factor of the circuit, reducing the loss of reactive power, and improving the efficiency of the entire circuit.

[0035] It also includes a first resistor R2, one end of the first resistor R2 is connected to the output end of the power supply, and the other end of the first resistor R2 is connected between the first switch element Q1 and the control element.

[0036] Specifically, the output signal of the MCU is usually a PWM signal, which is used to control the switching state of the first switching element Q1. The switching speed of the PWM signal is fast, and the voltage variation is large, which may cause the gate capacitance of the first switching element Q1 to charge and discharge too fast in a short time, resulting in a large current impact. The first resistor R2 will limit the current at this time, and slow down the rapid change of the signal by controlling the charging and discharging speed, thereby protecting the PMOS tube from damage by excessive current. Furthermore, if in a high-frequency circuit, electromagnetic noise and circuit parasitic parameters may cause oscillation or spike interference of the control signal. The first resistor R2 forms an RC network with the parasitic capacitance of the gate of the first switching element Q1, effectively filtering out high-frequency noise and preventing interference signals from triggering mis-turning on or off of the first switching element Q1. Since the gate voltage of the first switching element Q1 needs to switch between a higher level (such as close to the input voltage) and a lower level (such as ground), the presence of the first resistor R2 can avoid overshoot or undershoot, and ensure that the gate voltage reaches a stable switching threshold when switching, which can improve the efficiency of the switching process and reduce energy loss.

[0037] The device further comprises a second resistor R3, one end of which is connected between the second switch element Q2 and the control element, and the other end of which is connected to the ground.

[0038] Specifically, in the conduction stage, when the MCU outputs a high-level signal (such as close to the power supply voltage), the second resistor R3 limits the current of the control signal charging the gate of the second switch element Q2, slowly raising the gate voltage to a voltage higher than the threshold voltage of the second switch element Q2, so that it is turned on. Through this current limiting effect, the transient large current impact that may be caused by direct fast charging is avoided, thereby protecting the control element and the second switch element Q2. In the shutdown stage, when the MCU outputs a low-level signal (close to ground), the second resistor R3 forms a discharge path between the gate and the ground, so that the gate voltage gradually drops below the shutdown voltage of the second switch element Q2, and a safe shutdown is achieved. The discharge current in this process is also limited by the second resistor R3 to prevent control signal oscillation or reflection interference caused by rapid discharge. There are also noise suppression and signal stabilization functions. The second resistor R3 and the parasitic capacitance of the gate of the second switch element Q2 form an RC network together, which can filter out high-frequency noise and prevent the gate from causing misconduction or oscillation due to external electromagnetic interference.

[0039] Furthermore, in circuit design, the selection of the resistance value of the second resistor R3 is critical, and its value needs to be optimized based on the following factors: A resistance value that is too low may cause the gate current to be too large, which will not be able to effectively limit the current and provide protection. Too high a resistance value will prolong the on and off time of NMOS and reduce the response speed of the circuit.

[0040] Typically, the resistance of the second resistor R3 is designed to be between hundreds of ohms and thousands of ohms, and the specific value depends on the parasitic capacitance of the second switch element Q2, the frequency of the PWM signal, and the switching speed requirements of the circuit. In a specific implementation, a resistance value of 1kΩ to 10kΩ is often used to achieve a balance between the protection circuit and the response speed.

[0041] The first switch element Q1 is a PMOS tube, and the second switch element Q2 is an NMOS tube; The source of the first switch element Q1 is connected to the output end of the power supply; The source of the second switch element Q2 is connected to the ground terminal; One end of the energy storage element L is connected to the drain of the first switch element Q1, and the other end of the energy storage element L is connected to the drain of the second switch element Q2; The load R1 and the second switch element Q2 are connected in parallel, one end of the load R1 is connected to the drain of the second switch element Q2, and the other end of the load R1 is connected to the source of the second switch element Q2; The control element is connected to the gate of the first switch element Q1 and the gate of the second switch element Q2 respectively, and the control element is used to control the turn-off of the first switch element Q1 and the second switch element Q2.

[0042] The first switch element Q1 (PMOS tube): its source is connected to the output end of the power supply, and its drain is connected to one end of the energy storage element L (such as an inductor). This connection method enables the PMOS tube to effectively transfer the voltage of the power supply to the energy storage element L under the action of the control signal.

[0043] The second switch element Q2 (NMOS tube): its source is connected to the ground terminal, and its drain is connected to the other end of the energy storage element L. This connection mode enables the NMOS tube to control the current path between the energy storage element L and the ground under the action of the control signal.

[0044] Energy storage element L (such as inductor): connected between the drain of the PMOS tube and the drain of the NMOS tube. This connection method enables the inductor to store and release energy under the synergy of the PMOS tube and the NMOS tube.

[0045] Load R1: connected in parallel with the NMOS tube, one end of which is connected to the drain of the NMOS tube, and the other end is connected to the source of the NMOS tube. This parallel connection ensures that the load R1 can directly obtain energy from the energy storage of the inductor to achieve efficient power conversion.

[0046] Control element (such as MCU): connected to the gates of the PMOS tube and the NMOS tube respectively, and accurately controls the on and off states of the two switching elements through control signals.

[0047] By using a combination of PMOS and NMOS, the circuit achieves efficient energy transfer and conversion: By utilizing the low on-resistance characteristics of the PMOS tube, power loss can be effectively reduced during the energy storage stage, thereby improving circuit efficiency.

[0048] By utilizing the high switching speed and stable conduction performance of the NMOS tube, efficient energy conversion is provided in the release phase to drive the load R1.

[0049] The precise control of the MCU realizes dynamic adjustment of energy storage and release time through PWM technology, thereby meeting the power requirements of different loads R1 and improving the flexibility and reliability of the system.

[0050] In summary, the reasonable coordination of PMOS and NMOS, as well as the precise driving of control elements, together constitute the core of this technical solution, achieving efficient and stable power conversion and output.

[0051] A heating method for an electronic atomizer, applied to a heating circuit of the electronic atomizer, is characterized by comprising the following steps: S1. The control element collects the load R1 current and output voltage and calculates the load R1 power; The control unit (MCU) collects the current of load R1 and output voltage , calculate the power of load R1;

[0052] S2. Set the target power to , calculate the power error;

[0053] S3. Calculate a new PWM duty cycle based on the power error using a PID control algorithm;

[0054] in, is the proportional gain, which indicates the instantaneous effect of the error on the PWM signal; is the integral gain, which represents the influence of the accumulated error and is used to correct the long-term error of the system; is the derivative gain, which represents the effect of error changes and is used to predict in advance and mitigate system over-response.

[0055] S4. Change the release time by adjusting the duty cycle; If the power error is greater than 0, increase the duty cycle and shorten the release time; If the power error is less than 0, the duty cycle is reduced and the release time is extended.

[0056] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "including a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0057] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heating circuit for an electronic atomizer, characterized in that: It includes a power supply, a first switch element, a second switch element, an energy storage element, a load and a control element; The first end of the first switch element is connected to the output end of the power supply; The second end of the second switch element is connected to the ground end; One end of the energy storage element is connected to the second end of the first switch element, and the other end of the energy storage element is connected to the first end of the second switch element; The load and the second switch element are connected in parallel, one end of the load is connected to the first end of the second switch element, and the other end of the load is connected to the second end of the second switch element; The control element is connected to the third end of the first switch element and the third end of the second switch element respectively, and the control element is used to control the turn-off of the first switch element and the second switch element.

2. The heating circuit of the electronic atomizer according to claim 1, characterized in that: It also includes a sampling resistor; The sampling resistor is connected in parallel with the load, one end of the sampling resistor is connected to the second end of the second switch element and the control element, and the other end of the sampling resistor is connected to the ground end.

3. The heating circuit of the electronic atomizer according to claim 1, characterized in that: It also includes a first capacitor, one end of which is connected between the first switch element and the energy storage element, and the other end of the first capacitor is connected to the ground.

4. The heating circuit of the electronic atomizer according to claim 1, characterized in that: It also includes a first resistor, one end of which is connected to the output end of the power supply, and the other end of which is connected between the first switch element and the control element.

5. The heating circuit of the electronic atomizer according to claim 1, characterized in that: It also includes a second resistor, one end of the second resistor is connected between the second switch element and the control element, and the other end of the second resistor is connected to the ground.

6. A heating circuit for an electronic atomizer according to any one of claims 1 to 5, characterized in that: The first switch element is a PMOS tube, and the second switch element is an NMOS tube; The source of the first switch element is connected to the output end of the power supply; The source of the second switch element is connected to the ground terminal; One end of the energy storage element is connected to the drain of the first switch element, and the other end of the energy storage element is connected to the drain of the second switch element; The load and the second switch element are connected in parallel, one end of the load is connected to the drain of the second switch element, and the other end of the load is connected to the source of the second switch element; The control element is connected to the gate of the first switch element and the gate of the second switch element respectively, and the control element is used to control the turn-off of the first switch element and the second switch element.

7. A heating method for an electronic atomizer, applied to the heating circuit of the electronic atomizer according to any one of claims 1 to 6, characterized in that: The following steps are involved: The control element collects the load current and output voltage and calculates the load power; Set target power and calculate power error; Using PID control algorithm, a new adjustment duty cycle is calculated according to the power error; By adjusting the duty cycle, the release time can be changed.

8. The heating method of an electronic atomizer according to claim 7, characterized in that: The method of changing the release time by adjusting the duty cycle includes: If the power error is greater than 0, increase the duty cycle and shorten the release time; If the power error is less than 0, the duty cycle is reduced and the release time is extended.

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