Double-section heating element heating circuit and electronic atomization device

Abstract

The invention relates to the technical field of atomization, and discloses a double-section heating element heating circuit and an electronic atomization device.The double-section heating element heating circuit comprises a first heating element, a second heating element, a switch module and an oscillation module; the first heating body is connected with the oscillation module in parallel and then connected with the switch module in series to form a heating circuit, one end of the heating circuit receives power voltage, the other end of the heating circuit is grounded, and the first heating body makes contact with the second heating body. The switch module enables the oscillation module to be in an oscillation state according to the control signal so as to enable the first heating body and the second heating body to heat. According to the technical scheme, the oscillation module is connected with the first heating body in parallel, and the oscillation state of the oscillation module is controlled by controlling the switch module, so that the heating body can realize rapid heating under relatively high power, the requirement of rapid temperature rise can be met, the circuit complexity and power consumption can be reduced, a booster circuit does not need to be added, and the cost is reduced. Therefore, the performance and the cost effectiveness of the whole heating circuit are optimized.

Description

Technical Field

[0001] The present application belongs to the field of atomization technology, and in particular relates to a dual-stage heating element heating circuit and an electronic atomization device. Background Art

[0002] In the prior art, the heating element of the electronic atomization device needs to heat up quickly, so the driving circuit needs to provide a large output power. The conventional method is to reduce the resistance of the heating element or to increase the voltage to supply power to the heating element to achieve high power output. Therefore, in order to further increase the output power of the heating element, it is necessary to add a boost circuit. Only by increasing the driving voltage of the heating element can a higher power output be achieved, which increases the complexity of the system and may bring other design challenges, such as power consumption management, heat dissipation, and circuit reliability and cost. Therefore, how to maintain the simplicity and cost-effectiveness of the circuit while meeting the power requirements is a key technical challenge. Summary of the invention

[0003] The embodiments of the present invention provide a dual-stage heating element heating circuit and an electronic atomization device to solve the above-mentioned technical problems.

[0004] A first aspect of an embodiment of the present invention provides a dual-stage heating element heating circuit, comprising: a first heating element, a second heating element, a switch module and an oscillation module;

[0005] The first heating element is connected in parallel with the oscillation module and then in series with the switch module to form a heating circuit, one end of the heating circuit receives a power supply voltage and the other end is grounded, and the first heating element is in contact with the second heating element;

[0006] The switch module enables the oscillation module to be in an oscillation state according to a control signal, so as to make the first heating element and the second heating element generate heat.

[0007] Optionally, the switch module includes a first switch device and a second switch device;

[0008] One end of the first switch device receives the power supply voltage, and the other end is respectively connected to one end of the oscillation module and one end of the first heating element, one end of the second switch device is respectively connected to the other end of the oscillation module and the other end of the first heating element, and the other end of the second switch device is grounded;

[0009] The first switch device is in a normally closed state according to a conduction control signal, and the second switch device puts the oscillation module in an oscillating state according to a PWM control signal.

[0010] Optionally, the oscillation module includes a first capacitor and a first inductor, one end of the first capacitor and one end of the first inductor are connected together as one end of the oscillation module, and the other end of the first capacitor and the other end of the first inductor are connected together as the other end of the oscillation module.

[0011] Optionally, the heating circuit further includes a filter module, one end of which is connected to the other end of the first switch device, and the other end of which is connected to one end of the first heating element.

[0012] Optionally, the filtering module includes a second capacitor and a second inductor, one end of the second inductor is one end of the filtering module, the other end of the second inductor and one end of the second capacitor are connected together to form the other end of the filtering module, and the other end of the second capacitor is grounded.

[0013] Optionally, the heating circuit further includes a temperature detection module, one end of the second heating element receives the power supply voltage, and the other end is respectively connected to one end of the first heating element and one end of the temperature detection module, and the other end of the temperature detection module is grounded;

[0014] The temperature detection module obtains the temperature of the first heating element by detecting the temperature of the second heating element.

[0015] Optionally, the heating circuit further includes a control module, a signal acquisition end of the control module is connected to a sampling end of the temperature detection module, a first output end of the control module is connected to a control end of the switch module, and a second output end of the control module is connected to a control end of the temperature detection module;

[0016] The control module detects the temperature of the first heating element through the temperature detection module, and adjusts the temperature of the first heating element by controlling the on-off state of the switch module.

[0017] Optionally, the temperature detection module includes a second resistor, a third resistor, a fourth resistor and a third switching device, one end of the second resistor and one end of the fourth resistor are connected together as one end of the temperature detection module, the other end of the second resistor and one end of the third resistor are connected together as a sampling end of the temperature detection module, the second end of the third resistor is grounded, the second end of the fourth resistor is connected to one end of the third switching device, the other end of the third switching device is grounded, and the control end of the third switching device is the control end of the temperature detection module.

[0018] Optionally, the heating circuit further includes a fourth switch device and a fifth switch device, one end of the fourth switch device receives the power supply voltage, and the other end is connected to one end of the second heating element, one end of the fifth switch device is connected to the second end of the second heating element, and the other end of the fifth switch device is grounded, and the control end of the fourth switch device and the control end of the fifth switch device are respectively connected to the output end of the control module;

[0019] The control module controls the fourth switch device and the fifth switch device to be turned on simultaneously to heat the second heating element.

[0020] A second aspect of an embodiment of the present invention provides an electronic atomization device, which includes the dual-stage heating element heating circuit described in the first aspect.

[0021] The technical effect of the embodiment of the present invention is as follows: the embodiment of the present invention sets an oscillation module connected in parallel with the first heating element, controls the oscillation state of the oscillation module by controlling the switch module, so that the heating element can be quickly heated at a higher power; the coordination of the switch module and the oscillation module ensures the simplicity and low cost of the heating circuit, which can not only meet the demand for rapid heating, but also reduce circuit complexity and power consumption, and does not require the addition of a boost circuit, thereby optimizing the performance and cost-effectiveness of the entire heating circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0023] Figure 1 It is a structural schematic diagram of a double-stage heating element heating circuit provided by the first embodiment of the present invention;

[0024] Figure 2 This is another structural schematic diagram of a double-stage heating element heating circuit provided by the first embodiment of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a double-stage heating element heating circuit including a first switch device and a second switch device provided in Embodiment 1 of the present invention;

[0026] Figure 4 It is a circuit diagram of an oscillation module in a dual-stage heating element heating circuit provided in Embodiment 1 of the present invention;

[0027] Figure 5It is a structural schematic diagram of a double-stage heating element heating circuit including a filter module provided in the first embodiment of the present invention;

[0028] Figure 6 yes Figure 5 Circuit diagram of the filter module;

[0029] Figure 7 It is a structural schematic diagram of a temperature detection module included in a dual-stage heating element heating circuit provided in Embodiment 2 of the present invention;

[0030] Figure 8 It is a structural schematic diagram of a control module in a dual-stage heating element heating circuit provided in Embodiment 2 of the present invention;

[0031] Fig. 9 yes Figure 7 and Figure 8 Circuit diagram of the temperature detection module in;

[0032] Fig.10 It is a structural schematic diagram of a dual-stage heating element heating circuit including a fourth switch device and a fifth switch device provided in the second embodiment of the present invention;

[0033] Fig.11 This is a circuit diagram of a double-stage heating element heating circuit provided in Embodiment 2 of the present invention;

[0034] Fig.12 This is a current flow diagram when the switch SW4 and the switch SW5 are turned on in a dual-stage heating element heating circuit provided by the second embodiment of the present invention;

[0035] Fig.13 This is a current flow diagram when the switch SW3 and the switch SW4 are turned on in a dual-stage heating element heating circuit provided by the second embodiment of the present invention;

[0036] Fig.14 This is a current flow diagram when the switch SW1 and the switch SW2 in a dual-stage heating element heating circuit provided by the second embodiment of the present invention are turned on;

[0037] Fig.15 This is a current flow diagram when switches SW1, SW2, SW3 and SW4 are turned on in a dual-stage heating element heating circuit provided by the second embodiment of the present invention;

[0038] Fig.16 is a structural schematic diagram of an electronic atomization device provided in Embodiment 3 of the present invention;

[0039] In the figure: 101, a first heating element; 102, a second heating element; 103, a switch module; 104, an oscillation module; 105, a filter module; 106, a temperature detection module; 107, a control module; 131, a first switch device; 132, a second switch device; 161, a third switch device; 171, a fourth switch device; 172, a fifth switch device; 201, a first region; 202, a second region. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0042] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0043] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0044] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0045] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0046] Embodiment 1

[0047] Embodiment 1 of the present invention provides a dual-stage heating element heating circuit, such as Figure 1 and Figure 2 As shown, it includes: a first heating element 101, a second heating element 102, a switch module 103 and an oscillation module 104;

[0048] The first heating element 101 is connected in parallel with the oscillation module 104 and then connected in series with the switch module 103 to form a heating circuit. One end of the heating circuit receives the power supply voltage VCC and the other end is grounded. The first heating element 101 is in contact with the second heating element 102.

[0049] The switch module 103 puts the oscillation module 104 into an oscillation state according to the control signal, so as to make the first heating element 101 and the second heating element 102 generate heat.

[0050] Among them, the first heating element 101 is the main heating element, responsible for providing initial heat for preheating. It is connected in parallel with the oscillation module 104 and heats up rapidly when powered on. The second heating element 102 is in contact with the first heating element 101 and is used for auxiliary heating or to continue to maintain or increase the overall temperature after the first heating element 101 reaches a certain temperature. The switch module 103 is used to control the working state of the oscillation module 104 according to the control signal, thereby adjusting the heating power of the first heating element 101. The connection position of the switch module 103 can be as follows Figure 1 As shown, it is located between the power supply voltage and the parallel oscillation module 104 and the first heating element 101; the position of the switch module 103 can also be as shown in FIG. Figure 2 As shown, the switch modules 103 in the above different connection positions can control the conduction and shutdown of the heating circuit. The oscillation module 104 generates an oscillation signal according to the on-off of the switch module 103, so that after being connected in parallel with the first heating element 101, the current and voltage of the heating circuit can be effectively adjusted, thereby controlling the heating effect of the heating element. The oscillation module 104 can stabilize the current output by generating a high-frequency oscillation signal, and at the same time, can achieve precise adjustment of the heating element to ensure that the heating element is heated at the required power level, thereby improving the heating efficiency. The oscillation module 104 mainly generates a high-frequency oscillation signal through an internal oscillator circuit, which can be a fixed frequency or can be adjusted as needed. The frequency of the high-frequency oscillation signal determines the current and voltage in the heating circuit, thereby affecting the heating power of the heating element. By adjusting the duty cycle of the switch module 103 and then adjusting the frequency of the oscillation signal, the effective value of the output current of the oscillation module 104 can be controlled, thereby increasing the heating power of the first heating element 101 without changing the power supply voltage. The increase of the frequency of the oscillation signal will increase the frequency of the current, so that more current passes through the first heating element 101 in the same time, and the power output of the first heating element 101 is improved. The oscillation module 104 can be an oscillation circuit (such as an LC oscillator) formed by inductance and capacitance elements. By adjusting the oscillation state of the inductance and capacitance, the oscillation module 104 can change the resonant frequency of the circuit, thereby affecting the voltage and current distribution on the heating element. When the oscillation module 104 adjusts the oscillation circuit to enter the resonant state, the current and voltage will be amplified, and this amplification effect can directly improve the heating power of the heating element. The oscillation module 104 can control the oscillation process in a pulse width modulation (PWM) manner, and control the switch module 103 by adjusting the duty cycle of the pulse signal, thereby controlling the heating power. The PWM signal adjusts the current on the heating element by controlling the ratio of the on time to the off time of the pulse. By increasing the duty cycle of the pulse signal, the oscillation module 104 can provide current to the heating element for a longer time, thereby increasing the average power of the heating element.

[0051] The technical effect of this embodiment is that: this technical solution sets an oscillation module in parallel with the first heating element, controls the oscillation state of the oscillation module by controlling the switch module, so that the heating element can be quickly heated at a higher power; the coordination of the switch module and the oscillation module ensures the simplicity and low cost of the heating circuit, which can not only meet the demand for rapid heating, but also reduce circuit complexity and power consumption, and does not require the addition of a boost circuit, thereby optimizing the performance and cost-effectiveness of the entire heating circuit.

[0052] For the switch module 103, as an implementation mode, Figure 3 As shown, the switch module 103 includes a first switch device 131 and a second switch device 132; one end of the first switch device 131 receives the power supply voltage, and the other end is respectively connected to one end of the oscillation module 104 and one end of the first heating element 101, one end of the second switch device 132 is respectively connected to the other end of the oscillation module 104 and the other end of the first heating element 101, and the other end of the second switch device 132 is grounded;

[0053] The first switch device 131 is in a normally closed state according to the conduction control signal, and the second switch device 132 puts the oscillation module 104 in an oscillating state according to the PWM control signal.

[0054] Among them, the first switch device 131 is in the on state according to the on control signal. Under normal circumstances, the first switch device 131 is designed to be in the normally closed state and always remains on, allowing the power supply voltage to be directly applied to the oscillation module 104 and the first heating element 101. The second switch device 132 controls the grounding state of the oscillation module 104, and adjusts the oscillation state of the oscillation module 104 according to the PWM control signal, thereby adjusting the heating power of the first heating element 101. By cooperating with the continuous power supply in the normally closed state of the first switch device 131, the second switch device 132 controls the oscillation module 104 to enter the oscillation state and controls the oscillation process of the oscillation module 104 through the PWM control signal. Since the first switch device 131 is on, the second switch device 132 can be used to adjust the heating intensity and temperature control. After the grounding of the second switch device 132 is turned on, the oscillation module 104 generates an oscillation signal for controlling the heating power of the first heating element 101. The oscillation module 104 can remain in the ready state when the first switch device 131 is turned on by default. Once the second switch device 132 is connected to ground, the oscillation module 104 immediately starts to oscillate and quickly provides the required current and voltage to the first heating element 101.

[0055] The technical effect of this embodiment is that the first switching device is set in a normally closed state, and the second switching device adjusts the working state of the oscillation module through a PWM control signal, thereby controlling the heating power of the first heating element. This embodiment not only simplifies the control logic and improves the response speed of the system, but also improves the efficiency of the heating process through flexible adjustment of the oscillation module.

[0056] Wherein, for the oscillation module 104, the structure of the oscillation module 104 includes but is not limited to the following structure:

[0057] 1. LC oscillation circuit: A parallel or series resonant circuit consisting of an inductor and a capacitor. Oscillation is formed through the energy exchange between the inductor and the capacitor, and the resonant frequency is determined by the values ​​of the inductor and the capacitor.

[0058] 2.RC oscillator circuit: It is composed of a resistor and a capacitor, usually used in conjunction with an operational amplifier or transistor. The charging and discharging process between the resistor and the capacitor produces oscillations, and the oscillation frequency is determined by the time constant of the RC network.

[0059] 3. Crystal oscillator circuit: uses a quartz crystal as a resonant element, usually combined with two capacitors and an amplifier (such as a transistor or an operational amplifier). The piezoelectric effect of the quartz crystal is used to stabilize the oscillation frequency, and the frequency is extremely accurate and stable.

[0060] 4. Ring oscillator: An odd number of inverters (such as CMOS inverters) are connected in series to form a ring. The output of each inverter is connected to the input of the next inverter, and the output of the last inverter is fed back to the input of the first inverter. The signal is continuously reversed and propagated in the inverter ring to form an oscillation. The oscillation frequency is determined by the delay time and number of the inverters.

[0061] 5. Charge pump oscillator: It includes charge pump circuit (usually composed of switch circuit and capacitor), control logic, and oscillator core. It controls the voltage rise and fall through the charge pump principle to adjust the frequency and phase of the oscillation signal.

[0062] 6. Phase-locked loop (PLL) oscillator: includes a phase detector, a low-pass filter, a voltage-controlled oscillator (VCO), and a feedback loop, and usually also includes a frequency divider for frequency adjustment of the feedback signal. By comparing the phase difference between the input signal and the VCO output signal, the frequency of the VCO is controlled to keep it locked with the input signal. After phase locking, the PLL outputs a stable frequency synchronized with the input signal.

[0063] As an implementation of the oscillation module 104, this implementation is only used as an example and does not limit the structure of the oscillation module 104. Figure 4As shown, the oscillation module 104 includes a first capacitor C1 and a first inductor L1. One end of the first capacitor C1 and one end of the first inductor L1 are connected together as one end of the oscillation module 104, and the other end of the first capacitor C1 and the other end of the first inductor L1 are connected together as the other end of the oscillation module 104.

[0064] Among them, the main function of the first capacitor C1 is to store and release charge, and together with the first inductor L1, it constitutes an LC oscillation circuit, and generates an oscillation signal through the charging and discharging process. In the LC oscillation circuit, the first capacitor C1 stores electric energy and oscillates together with the first inductor L1 to generate an alternating electric field. This process can stabilize the voltage and current in the circuit, provide a smooth oscillation signal, and ensure the stable operation of the oscillation module 104. The main function of the first inductor L1 is to generate an electromotive force through the establishment and collapse of the magnetic field. The first inductor L1 stores energy and buffers the current change when the current changes. The first inductor L1 generates a magnetic field by the change of the induced current, and generates a reverse electromotive force when the magnetic field changes, interacting with the electric field change of the first capacitor C1 to maintain the continuous oscillation of the current.

[0065] Among them, when the driving frequency of the switch module 103 is consistent with the resonant frequency of the LC oscillation circuit, the LC oscillation circuit exhibits a pure resistance characteristic (the inductive reactance XL = 2πfL, which is equal to the capacitive reactance XC = 1 / 2πfC), and the voltage and current in the LC oscillation circuit reach the maximum amplitude value. At this time, the power calculation formula of the first heating element 101 is P = V × V / R, V is the voltage across the heating element, and R is the resistance of the heating element. Since the effective value of the sine wave is equal to 1 / √2 times its amplitude, the effective value of the voltage across the heating element during LC resonance is A × 1 / √2, where A is the amplitude. The power of the first heating element 101:

[0066] P1=V×V / R=(A×1 / √2)×(A×1 / √2) / R=A×A / 2R.

[0067] In the prior art, when power is directly supplied to the heating element, the power of the heating element is:

[0068] P=Vb×Vb / R, Vb is the supply voltage, and R is the resistance of the heating element.

[0069] By adjusting the driving signal frequency so that A×A / 2>Vb×Vb, the power of the heating element in the above heating circuit will be greater than the power directly supplied to the heating element in the prior art, thereby achieving the goal of increasing the output power of the heating element without using a complex boost circuit.

[0070] As an implementation method, Figure 5 As shown, the heating circuit further includes a filter module 105 , one end of the filter module 105 is connected to the other end of the first switch device 131 , and the other end of the filter module 105 is connected to one end of the first heating element 101 .

[0071] Among them, the main function of the filter module 105 is to eliminate or reduce the unnecessary high-frequency noise or electromagnetic interference (EMI) in the circuit. When the switching device is frequently switched, high-frequency noise may be generated. The filter module 105 can filter out these interference signals to ensure the stability of the circuit. The filter module 105 can also protect the heating element and the oscillation module 104 in the circuit from sudden voltage spikes or transient current impacts, thereby extending the service life of the system.

[0072] As an implementation method, Figure 6 As shown, the filter module 105 includes a second capacitor C2 and a second inductor L2, one end of the second inductor L2 is one end of the filter module 105, the other end of the second inductor L2 and one end of the second capacitor C2 are connected together as the other end of the filter module 105, and the other end of the second capacitor C2 is grounded.

[0073] The overall function of the LC filter formed by the second capacitor C2 and the second inductor L2 is to filter interference factors in the circuit and provide stable current and voltage. The low-pass filter formed by connecting the second inductor and the second capacitor in series allows low-frequency signals to pass while blocking high-frequency noise.

[0074] The technical effect of this embodiment is that the LC filter can effectively suppress high-frequency noise and spike signals in the current and voltage, making the electric energy applied to the heating element more stable, thereby improving the heating efficiency.

[0075] Embodiment 2

[0076] The difference between the second embodiment and the first embodiment lies in that a temperature detection module is added to perform temperature detection and a switch device is added to heat the second heating element.

[0077] This embodiment 2 provides a dual-stage heating element heating circuit. Based on the embodiment 1, Figure 7 As shown, the heating circuit also includes a temperature detection module 106, one end of the second heating element 102 receives a power supply voltage, and the other end is respectively connected to one end of the first heating element 101 and one end of the temperature detection module 106, and the other end of the temperature detection module 106 is grounded; the temperature detection module 106 obtains the temperature of the first heating element 101 by detecting the temperature of the second heating element 102.

[0078] Among them, the second heating element 102 is not only responsible for auxiliary heating, but also reflects the temperature of the first heating element 101 through its temperature change. During the heating process, it is thermally coupled with the first heating element 101, and the temperature information of the first heating element 101 is indirectly obtained through its temperature change. Since the second heating element 102 and the first heating element 101 are interconnected and driven by the same power supply, its temperature change can reflect the working state of the first heating element 101. By detecting the temperature of the second heating element 102, the temperature of the first heating element 101 can be indirectly monitored, avoiding the circuit complexity caused by directly measuring the first heating element 101. The temperature detection module 106 is responsible for monitoring the temperature of the second heating element 102, and using this temperature to infer the temperature of the first heating element 101. Through real-time detection of the temperature, the temperature detection module 106 can provide the necessary feedback signal for controlling the working state of the circuit to ensure that the heating process is carried out within a safe temperature range. The first heating element 101 is the main heating element, which performs the heating task through its temperature change and is controlled by the entire heating circuit.

[0079] The technical effect of this embodiment is that the entire heating circuit in this embodiment realizes precise temperature control and feedback through the coordinated work of the temperature detection module, the second heating element and the first heating element. The second heating element not only provides auxiliary heating, but also reflects the temperature of the first heating element through the temperature detection module, thereby simplifying the temperature monitoring process.

[0080] As an implementation method, Figure 8 As shown, the heating circuit also includes a control module 107, a signal acquisition end of the control module 107 is connected to the sampling end of the temperature detection module 106, a first output end of the control module 107 is connected to the control end of the switch module 103, and a second output end of the control module 107 is connected to the control end of the temperature detection module 106; the control module 107 detects the temperature of the first heating element 101 through the temperature detection module 106, and adjusts the temperature of the first heating element 101 by controlling the on-off state of the switch module 103.

[0081] The control module 107 works in coordination with the temperature detection module 106 and the switch module 103 to form a closed-loop control system for accurately adjusting the temperature of the first heating element 101. The signal acquisition end of the control module 107 is connected to the temperature detection module 106 for receiving temperature information, the first output end is connected to the control end of the switch module 103 for controlling the on-off state of the switch module 103, thereby adjusting the heating power of the first heating element 101, and the second output end is connected to the control end of the temperature detection module 106 for controlling the working state of the temperature detection module 106. The control module 107 receives the temperature data of the temperature detection module 106, and adjusts the control signal of the output switch module 103 according to the set temperature range and control logic to adjust the temperature of the first heating element 101.

[0082] Taking the switch module 103 including the first switch device 131 and the second switch device 132 as an example, the specific working process of this embodiment is as follows:

[0083] The signal acquisition end of the control module 107 is connected to the temperature detection module 106 for receiving the current temperature data. The temperature detection module 106 monitors the temperature of the second heating element 102 in real time, and then obtains the temperature of the first heating element 101, and sends this information to the control module 107. A temperature reference value is set in the control module 107, which can be a target temperature set by the user or a temperature range dynamically adjusted according to the application scenario. The control module 107 compares the received real-time temperature data with the target temperature, calculates the temperature error (i.e., the difference between the actual temperature and the target temperature), and uses it to adjust the duty cycle of the PWM control signal. The control module 107 generates a PWM control signal through a control algorithm. The commonly used one is the PID (proportional-integral-differential) control algorithm. Proportional control (P): directly adjusts the duty cycle of the PWM control signal according to the size of the temperature error. A larger error will result in a larger duty cycle, thereby increasing the heating power. Integral control (I): taking into account the accumulated temperature error, gradually adjust the PWM control signal to eliminate the deviation. Differential control (D): adjust according to the speed of temperature change to prevent overshoot or oscillation. Through the PID control algorithm, the control module 107 generates an accurate PWM control signal and a conduction control signal. The control module 107 outputs the conduction control signal to the first switch device 131, so that the first switch device 131 is in a normally closed state. The control module 107 outputs the PWM control signal to the second switch device 132. The duty cycle of the PWM control signal will be dynamically adjusted as the temperature error changes. The duty cycle of the PWM signal determines the duration of the conduction of the second switch device 132 in each cycle. A higher duty cycle means that the second switch device 132 is turned on for a longer period of time, thereby increasing the heating power of the first heating element 101; a lower duty cycle means that the conduction time of the second switch device 132 is shorter, reducing the heating power. The temperature of the first heating element 101 changes with the change of the PWM signal. The temperature detection module 106 continuously monitors the temperature of the first heating element 101 and feeds back the real-time data to the control module 107. The control module 107 calculates the error again according to the new temperature data, and continues to adjust the duty cycle of the PWM signal until the actual temperature reaches or approaches the target temperature, forming a closed-loop control.

[0084] As an example, assuming that the target temperature is 100°C, the current actual temperature is 90°C, and the control module 107 detects that the temperature error is 10°C, the control module 107 generates a PWM signal with a higher duty cycle (e.g., 75%) to turn on the second switch device 132 for a long time to increase the heating power. As the temperature rises to 95°C, the temperature error decreases, and the control module 107 reduces the duty cycle of the PWM signal (e.g., 50%) to reduce the heating power and avoid temperature overshoot. When the temperature approaches 100°C, the control module 107 continues to adjust the PWM signal to further reduce the duty cycle (e.g., 20%) to maintain the temperature within a range close to the target value.

[0085] The technical effect of this embodiment is that this embodiment forms an efficient and stable temperature control system through the coordinated work of the control module, the temperature detection module, the switch module and the first heating element, monitors the temperature in real time and adjusts the state of the switch module to maintain the first heating element within the optimal temperature range, thereby achieving an efficient and reliable heating process.

[0086] The temperature detection module 106 includes but is not limited to the following structures:

[0087] 1. Thermistor (NTC or PTC): A thermistor is a temperature sensor whose resistance value changes with temperature. The resistance value of an NTC (negative temperature coefficient) thermistor decreases as the temperature increases, while the resistance value of a PTC (positive temperature coefficient) thermistor increases as the temperature increases.

[0088] 2. Thermocouple: Thermocouples are made of conductors or semiconductors of two different materials. When the temperature of the junction changes, an electromotive force (voltage) is generated at both ends, which is proportional to the temperature difference.

[0089] 3. Resistance Temperature Detector: Its resistance value changes with temperature, and the temperature is measured based on the resistance value.

[0090] 4. Semiconductor temperature sensor: Based on the working principle of diode or transistor, the temperature is determined by measuring the characteristics of its voltage or current changing with temperature.

[0091] 5. Digital temperature sensor: The digital temperature sensor integrates temperature measurement and digital processing circuits, directly outputs digital temperature signals, and usually communicates with the microcontroller using digital interfaces such as I2C, SPI or 1-Wire.

[0092] As an implementation method, Fig. 9As shown, the temperature detection module 106 includes a second resistor R2, a third resistor R3, a fourth resistor R4 and a third switch device 161. One end of the second resistor R2 and one end of the fourth resistor R4 are connected together as one end of the temperature detection module 106, the other end of the second resistor R2 and one end of the third resistor R3 are connected together as a sampling end of the temperature detection module 106, the second end of the third resistor R3 is grounded, the second end of the fourth resistor R4 is connected to one end of the third switch device 161, the other end of the third switch device 161 is grounded, and the control end of the third switch device 161 is the control end of the temperature detection module 106.

[0093] Among them, the second resistor R2, the third resistor R3, and the fourth resistor R4 together form a voltage divider network of the second heating element 102. The role of the second resistor R2 is to participate in the generation of a voltage signal related to temperature, which will be output at the sampling end for temperature detection. The third resistor R3 is connected to the lower end of the voltage divider circuit and grounded. The third resistor R3 and the second resistor R2 constitute a voltage divider, which determines the voltage output of the sampling end. The fourth resistor R4 is connected between the second heating element and the third switching device 161. When the third switching device 161 is turned on, the fourth resistor R4 is introduced into the circuit, thereby affecting the voltage distribution of the entire circuit. In this circuit, after the second heating element T2 is divided by the fourth resistor R4, it is divided again by the second resistor R2 and the third resistor R3. By reading the sampling end voltage sampling value VADC, the resistance of the second heating element 102 is obtained, and the temperature of the second heating element 102 is calculated according to the TCR characteristics of the second heating element 102. The specific calculation process is as follows:

[0094]

[0095] Among them, VIN is the input terminal voltage, VADC is the sampling terminal voltage, T2 is the resistance value of the second heating element 102, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, and R4 is the resistance value of the fourth resistor.

[0096] According to the above formula, the resistance value T2 of the second heating element 102 can be obtained, and then the temperature of the second heating element 102 can be calculated according to the following formula:

[0097] T2=T0×(1+ɑ×△T);

[0098] Among them, T2 is the resistance value at the current temperature, T0 is the resistance value at the reference temperature (usually 25 degrees), ɑ is the temperature coefficient, and △T is the temperature difference, that is, the difference between the current temperature and the reference temperature.

[0099] According to the above formula, ΔT can be obtained, and then the actual temperature T of the second heating element 102 can be calculated according to the following formula:

[0100] T = Tref + ΔT;

[0101] Where Tref is the reference temperature (usually 25 degrees).

[0102] The technical effect of this embodiment is that, through the configuration of the resistor divider, a stable voltage sampling signal directly related to the temperature change is provided, thereby ensuring the accuracy of temperature detection.

[0103] The second embodiment can also heat the second heating element 102. As an implementation method, Fig.10 As shown, the heating circuit also includes a fourth switch device 171 and a fifth switch device 172, one end of the fourth switch device 171 receives the power supply voltage, and the other end is connected to one end of the second heating element 102, one end of the fifth switch device 172 is connected to the other end of the second heating element 102, and the other end of the fifth switch device 172 is grounded, and the control end of the fourth switch device 171 and the control end of the fifth switch device 172 are respectively connected to the output end of the control module 107; the control module 107 heats the second heating element 102 by controlling the fourth switch device 171 and the fifth switch device 172 to be turned on at the same time.

[0104] When the fourth switch device 171 and the fifth switch device 172 are turned on, the power supply voltage is applied to the second heating element 102, and the second heating element 102 is powered on and heated. The control signals of the two switch devices are respectively provided by the output end of the control module 107, and the control module 107 can dynamically adjust the states of the two switch devices according to the temperature data provided by the temperature detection module 106, so as to accurately control the operation of the second heating element.

[0105] The second embodiment of the present invention is described in detail below through a specific circuit structure:

[0106] like Fig.11 As shown, the first heating element 101 is the heating element T1, the second heating element 102 is the heating element T2, the first switching device 131 is the switch SW1, the second switching device 132 is the switch SW2, the third switching device 161 is the switch SW3, the fourth switching device 171 is the switch SW4, the fifth switching device 172 is the switch SW5, the oscillation module 104 includes the inductor L1 and the capacitor C1, the filtering module 105 includes the inductor L2 and the capacitor C2, and the temperature detection module 106 includes the resistor R2, the resistor R3, the resistor R4, and the switch SW3.

[0107] The connection relationship between the components is: one end of the switch SW1 and one end of the switch SW4 are connected together and receive the power supply voltage, the other end of the switch SW1 is connected to one end of the inductor L2, the other end of the inductor L2, one end of the capacitor C2, one end of the capacitor C1, one end of the inductor L1, one end of the heating element T1, one end of the heating element T2, one end of the switch SW5, one end of the resistor R2, and one end of the resistor R4 are connected together, the other end of the switch SW4 is connected to the other end of the heating element T2, the other end of the capacitor C2 is grounded, the other end of the capacitor C1, the other end of the inductor L1, the other end of the heating element T1, and one end of the switch SW2 are connected together, the other end of the switch SW2 is grounded, the other end of the switch SW5 is grounded, the other end of the resistor R2 and one end of the resistor R3 are connected together as the signal acquisition end of the temperature detection module 106, the other end of the resistor R3 is grounded, the other end of the resistor R4 is connected to one end of the switch SW3, and the other end of the switch SW3 is grounded.

[0108] The working process of the circuit structure provided in the second embodiment is as follows:

[0109] like Fig.12 As shown, when the switch SW4 and the switch SW5 are turned on, and the switch SW1, the switch SW2 and the switch SW3 are turned off, the second heating element T2 starts to heat up.

[0110] like Fig.13 As shown, when the switch SW3 and the switch SW4 are turned on, and the switch SW1, the switch SW2 and the switch SW5 are turned off, after the second heating element T2 is divided by the resistor R4, the resistor R2 and the resistor R3 are divided again. The resistance value of the second heating element T2 can be obtained by the voltage sampling value VADC output by the sampling terminal A, and the temperature of the second heating element T2 can be calculated according to the TCR characteristic of the second heating element T2.

[0111] like Fig.14 As shown, when switches SW1 and SW2 are turned on, and switches SW3, SW4 and SW5 are turned off, the first heating element T1 starts to heat up. The driving signal of switch SW2 is a high-frequency pulse signal, and switch SW1 is a normally closed signal. When switch SW2 is turned on, the power supply voltage VCC charges capacitor C1 through inductor L2; when switch SW2 is turned off, capacitor C1 discharges to inductor L1. When the driving frequency of switch SW3 is consistent with the resonant frequency of the LC resonant circuit, the LC resonant circuit exhibits a pure resistance characteristic (inductor reactance XL = 2πfL, which is equal to capacitor reactance XC = 1 / 2πfC), and the voltage and current in the LC resonant circuit reach the maximum amplitude value. The power calculation formula of the first heating element T1 is P = V × V / R, where V is the voltage across the first heating element T1, and R is the resistance of the first heating element T1. Since the effective value of a sine wave is equal to its amplitude times, so the effective value of the voltage across the heating element during LC resonance is Where A is the amplitude. The heating power of the first heating element T1 is:

[0112]

[0113] The power directly supplied to the heating element in the prior art is:

[0114] P = Vb × Vb / R;

[0115] Among them, Vb is the supply voltage and R is the resistance of the heating element.

[0116] By adjusting the driving signal frequency so that A×A / 2>Vb×Vb, the power of the heating element in the above circuit will be greater than the power directly supplied to the heating element by the battery, thereby increasing the output power of the heating element without using a complex boost circuit.

[0117] like Fig.15 As shown, switches SW1, SW2, SW3 and SW4 are turned on, and when switch SW5 is turned off, after the second heating element T2 is divided by the resistor R4, the resistors R2 and R3 are divided again. The resistance value of the second heating element T2 can be obtained by the voltage sampling value VADC output by the sampling terminal A, and the temperature of the second heating element T2 can be calculated according to the TCR characteristic of the second heating element T2. Since the temperature difference between the first heating element T1 and the second heating element T2 is not large, the temperature of the second heating element T2 can be used as the temperature of the first heating element T1, and the temperature of the first heating element T1 can be accurately controlled by adjusting the duty cycle of the switch SW2.

[0118] Embodiment 3

[0119] Embodiment 3 of the present invention provides an electronic atomization device, which includes the double-stage heating element heating circuit provided in the first aspect and the second aspect.

[0120] like Fig.16 As shown, the electronic atomization device includes a first area 201 and a second area 202. The first heating body 101 is located in the first area 201, and the second heating body 102 is located in the second area 202. When the first heating body 101 and the second heating body 102 generate heat, the atomized aerosol generates a matrix.

[0121] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A double-stage heating element heating circuit, characterized in that: include: A first heating element, a second heating element, a switch module and an oscillation module; The first heating element is connected in parallel with the oscillation module and then in series with the switch module to form a heating circuit, one end of the heating circuit receives a power supply voltage and the other end is grounded, and the first heating element is in contact with the second heating element; The switch module enables the oscillation module to be in an oscillation state according to a control signal, so as to make the first heating element and the second heating element generate heat.

2. The double-stage heating element heating circuit according to claim 1, characterized in that: The switch module includes a first switch device and a second switch device; One end of the first switch device receives a power supply voltage, the other end of the first switch device is respectively connected to one end of the oscillation module and one end of the first heating element, one end of the second switch device is respectively connected to the other end of the oscillation module and the other end of the first heating element, and the other end of the second switch device is grounded; The first switch device is in a normally closed state according to a conduction control signal, and the second switch device puts the oscillation module in an oscillating state according to a PWM control signal.

3. The double-stage heating element heating circuit according to claim 2, characterized in that: The oscillation module includes a first capacitor and a first inductor, one end of the first capacitor and one end of the first inductor are connected together as one end of the oscillation module, and the other end of the first capacitor and the other end of the first inductor are connected together as the other end of the oscillation module.

4. The double-stage heating element heating circuit according to claim 2, characterized in that: The heating circuit further comprises a filter module, one end of which is connected to the other end of the first switch device, and the other end of which is connected to one end of the first heating element.

5. The double-stage heating element heating circuit according to claim 4, characterized in that: The filter module includes a second capacitor and a second inductor, one end of the second inductor is one end of the filter module, the other end of the second inductor and one end of the second capacitor are connected together to form the other end of the filter module, and the other end of the second capacitor is grounded.

6. The double-stage heating element heating circuit according to any one of claims 1 to 5, characterized in that: The heating circuit further comprises a temperature detection module, one end of the second heating element receives the power supply voltage, and the other end is respectively connected to one end of the first heating element and one end of the temperature detection module, and the other end of the temperature detection module is grounded; The temperature detection module obtains the temperature of the first heating element by detecting the temperature of the second heating element.

7. The double-stage heating element heating circuit according to claim 6, characterized in that: The heating circuit further comprises a control module, wherein a signal acquisition end of the control module is connected to a sampling end of the temperature detection module, a first output end of the control module is connected to a control end of the switch module, and a second output end of the control module is connected to a control end of the temperature detection module; The control module detects the temperature of the first heating element through the temperature detection module, and adjusts the temperature of the first heating element by controlling the on-off state of the switch module.

8. The double-stage heating element heating circuit according to claim 7, characterized in that: The temperature detection module includes a second resistor, a third resistor, a fourth resistor and a third switch device. One end of the second resistor and one end of the fourth resistor are connected together as one end of the temperature detection module, the other end of the second resistor and one end of the third resistor are connected together as a sampling end of the temperature detection module, the second end of the third resistor is grounded, the second end of the fourth resistor is connected to one end of the third switch device, the other end of the third switch device is grounded, and the control end of the third switch device is the control end of the temperature detection module.

9. The double-stage heating element heating circuit according to claim 7, characterized in that: The heating circuit further includes a fourth switch device and a fifth switch device, one end of the fourth switch device receives the power supply voltage, and the other end is connected to one end of the second heating element, one end of the fifth switch device is connected to the second end of the second heating element, and the other end of the fifth switch device is grounded, and the control end of the fourth switch device and the control end of the fifth switch device are respectively connected to the output end of the control module; The control module controls the fourth switch device and the fifth switch device to be turned on simultaneously to heat the second heating element.

10. An electronic atomization device, characterized in that: The electronic atomization device includes the two-stage heating element heating circuit described in any one of claims 1 to 9.

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