Atomization driving circuit and electronic smoking set

Abstract

The utility model relates to an atomization driving circuit and an electronic smoking set, and belongs to the technical field of electronic smoking sets, and the atomization driving circuit comprises a heating driving module which is electrically connected with a main control circuit and is used for receiving a PWM signal output by the main control circuit; the heating driving module comprises a switch unit, the control end of the switch unit is connected with the main control circuit, one end of the switch unit is connected with a power supply of the electronic smoking set, and the other end of the switch unit is connected with a heating piece of the electronic smoking set; wherein the main control circuit controls the switching frequency of the switch unit through a PWM signal, so that the switch unit generates an output signal to heat the heating element. The electronic smoking set can prevent the output signal of the switch unit and the atomizer of the electronic smoking set from generating resonance to form current sound, and meanwhile control the frequency of noise generated by the atomizer in use, so that the current sound is solved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic smoking devices, and in particular to an atomization drive circuit and an electronic smoking device. Background Art

[0002] Electronic cigarettes are electronic products that imitate cigarettes. They mainly use heating elements (such as electric heating wires) to heat tobacco, oil and other materials to produce smoke. Electronic cigarettes include atomizers, which heat tobacco, oil and other materials through heating elements to produce smoke. However, the current atomizers vibrate and generate electric current sound when outputting, which affects the user's product experience. Utility Model Content

[0003] Based on this, it is necessary to provide an atomization drive circuit and an electronic smoking device that solves the current sound.

[0004] In a first aspect, the present application provides an atomization drive circuit, which is applied to an electronic smoking device, and the electronic smoking device includes a main control circuit; the atomization drive circuit includes:

[0005] The heating drive module is electrically connected to the main control circuit and is used to receive the PWM signal output by the main control circuit; the heating drive module includes: a switch unit, a control end of the switch unit is connected to the main control circuit, one end of the switch unit is used to connect to the power supply of the electronic smoking device, and the other end of the switch unit is connected to the heating element of the electronic smoking device; wherein the main control circuit controls the switching frequency of the switch unit through the PWM signal so that the switch unit generates an output signal to heat the heating element.

[0006] In one embodiment, the heating driving module includes a first resistor, a second resistor, a third resistor and a fourth resistor;

[0007] One end of the first resistor is connected between the power supply and one end of the switch unit, and the other end of the first resistor is connected between one end of the second resistor and the main control circuit;

[0008] One end of the second resistor is connected to the main control circuit, and the other end of the second resistor is connected to the control end of the switch unit;

[0009] One end of the third resistor is between the power supply and one end of the switch unit, and the other end of the third resistor is connected between the other end of the switch unit and the heating element;

[0010] One end of the fourth resistor is connected between the other end of the switch unit and the heating element, and the other end of the fourth resistor is used to access the PWM signal.

[0011] In one embodiment, the heating driving module further includes a first capacitor; one end of the first capacitor is connected to the other end of the fourth resistor, and the other end of the first capacitor is grounded.

[0012] In one embodiment, the switch unit includes at least one first MOS tube; the control end of the switch unit is the control end of the first MOS tube, one end of the switch unit is the first end of the first MOS tube, and the other end of the switch unit is the second end of the first MOS tube.

[0013] In one embodiment, the heating drive module also includes a detection unit; the control end of the detection unit is connected to the main control circuit, one end of the detection unit is used to connect to the power supply, and the other end of the detection unit is connected between the heating element and the other end of the switch unit.

[0014] In one embodiment, the detection unit includes a second MOS tube, a fifth resistor and a sixth resistor;

[0015] The control end of the detection unit is the control end of the second MOS tube, one end of the detection unit is the first end of the second MOS tube, and the other end of the detection unit is the second end of the second MOS tube;

[0016] One end of the fifth resistor is connected between the first end of the second MOS tube and the power supply, and the other end of the fifth resistor is connected between the control end of the second MOS tube and the main control circuit;

[0017] One end of the sixth resistor is connected to the second end of the second MOS tube, and the other end of the sixth resistor is connected between the switch unit and the heating element.

[0018] In one of the embodiments, the heating driving module further includes a first diode; the anode of the first diode is grounded, and the cathode of the first diode is connected between the other end of the switch unit and the heating element.

[0019] In one of the embodiments, the switching frequency of the switch unit comprises 20 KHz.

[0020] In one embodiment, the number of the heating driving modules is at least two.

[0021] In a second aspect, the present application provides an electronic smoking device, comprising the above-mentioned atomization drive circuit.

[0022] The above-mentioned atomization drive circuit is electrically connected to the electronic cigarette device, and the heating drive module is electrically connected to the main control circuit, and receives the PWM signal output by the main control circuit, wherein the heating drive module includes a switch unit, and the main control circuit controls the switching frequency of the switch unit through the PWM signal, so that the switch unit generates an output signal to heat the heating element. In the present application, based on the connection between the above-mentioned main control circuit and the switch unit in the heating drive module, the main control circuit can control the switching frequency of the switch unit through the PWM signal, thereby preventing the output signal of the switch unit from resonating with the atomizer of the electronic cigarette device to form current sound, and at the same time controlling the noise frequency generated by the atomizer during use to exceed the range that can be heard by the human ear, thereby solving the current sound. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of a module of an atomization driving circuit according to an embodiment;

[0025] Figure 2 A schematic diagram of an MCU used in a main control circuit of an embodiment;

[0026] Figure 3 is a schematic diagram of a circuit structure of a switch unit according to an embodiment;

[0027] Figure 4 A schematic diagram of a circuit structure of a heating driving module after a capacitor is set according to an embodiment;

[0028] Figure 5 A schematic diagram of a circuit structure in which a switch unit of an embodiment is set as a first MOS tube;

[0029] Figure 6 A schematic diagram of a heating drive module after a detection unit is provided in an embodiment;

[0030] Figure 7 A schematic diagram of a circuit structure of a heating driving module in which the detection unit of an embodiment is configured as a second MOS tube;

[0031] Figure 8 A schematic diagram of a circuit structure of a heating drive module after a diode is provided in an embodiment;

[0032] Fig. 9 A schematic diagram of an atomization driving circuit after two heating driving modules are provided in one embodiment. DETAILED DESCRIPTION

[0033] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0035] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0036] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0037] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0038] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0039] When using electronic cigarettes, the frequency of the output current of the atomizer will resonate with the heating element to form a current sound. At present, the solution to the current sound of electronic cigarettes is to add inductance to the output circuit to maintain the stability of the output current and reduce the sound generated by the vibration of the atomizer during output. However, the solution of adding inductance will increase the production cost of electronic cigarettes on the one hand, and on the other hand, it cannot completely eliminate the current sound.

[0040] like Figure 1 As shown, the present application provides an atomization drive circuit, which is applied to an electronic smoking device. The electronic smoking device includes a main control circuit 101, and the atomization drive circuit includes:

[0041] The heating drive module 103 is electrically connected to the main control circuit 101 and is used to receive the PWM signal output by the main control circuit 101; the heating drive module 103 includes a switch unit 105, a control end of the switch unit 105 is connected to the main control circuit 101, one end of the switch unit 105 is used to connect to the power supply 109 of the electronic smoking device, and the other end of the switch unit 105 is connected to the heating element 107 of the electronic smoking device; wherein the main control circuit 101 controls the switching frequency of the switch unit 105 through the PWM signal so that the switch unit 105 generates an output signal to heat the heating element.

[0042] Optionally, the main control circuit 101 may be an MCU (Microcontroller Unit), which is mounted on a solution board of the electronic cigarette device. Figure 2 The MCU shown has a main frequency PWM output frequency that can support the switching frequency of the switch unit. During operation, the main control circuit can output a PWM signal for controlling the switching frequency to the switch unit 105 through the PWM signal output interface (PWM1 and / or PWM2 pins) of the MCU.

[0043] When the set MCU main frequency rated PWM output frequency fails to meet the switching frequency requirements, the output frequency of the atomization drive circuit may be unstable, and the MCU program running at this time is prone to run away (program run away can mean that after the system receives interference, the value of the program counter PC deviates from the given unique change process, causing the program to deviate from the normal operation path). Therefore, the main frequency PWM output frequency of the selected MCU should be able to match the switching frequency of the switching unit. In addition, electronic cigarettes can also use MCU to control electronic cigarettes for function display, and the output power of electronic cigarettes can also be adjusted through MCU.

[0044] It can be understood that the main control circuit can also be in other forms, not limited to the forms mentioned in the above embodiments, as long as it can achieve the effect of outputting a PWM signal to the switch unit to control the switching frequency. The heating element can be a heating wire, a heating net, a heating patch and other different types of heating components, as long as it can achieve the effect of heating through electrical signal control. In addition, the power supply of the electronic cigarette can be a lithium battery, or other forms of power supply, as long as it can meet the energy supply requirements of various components of the electronic cigarette.

[0045] Specifically, when the above-mentioned atomization drive circuit is working, the main control circuit of the electronic cigarette device will output a PWM signal to the switch unit of the heating drive module to control the switch unit to generate an output signal (output current) of the switching frequency according to the PWM signal. The output current of this frequency can drive the heating element of the electronic cigarette device to generate heat. Under the control of the PWM signal, since the switching frequency is set outside the maximum frequency that can be heard by human hearing, the sound frequency of the current sound formed by the resonance between the output current frequency and the atomizer is also outside the maximum sound frequency that can be heard by human hearing, so that the noise frequency generated by the atomizer when working exceeds the range that can be heard by the human ear. For users of electronic cigarette devices, this application can completely eliminate the current sound of the atomizer through the setting of the above-mentioned atomization drive circuit, thereby improving the user's product experience.

[0046] like Figure 3 As shown, the heating drive module of an embodiment further includes a first resistor (R1), a second resistor (R2), a third resistor (R3) and a fourth resistor (R4). The BT+ interface of the heating drive module is used to connect the power supply of the electronic cigarette device, the HOT interface of the heating drive module is connected to the main control circuit, the F1+ interface of the heating drive module is connected to the heating element of the electronic cigarette device, and the PWM interface of the heating drive module is used to receive the PWM signal sent by the main control circuit. Specifically, one end of the first resistor (R1) is connected between the power supply and one end of the switch unit 301, and the other end of the first resistor (R1) is connected between one end of the second resistor (R2) and the main control circuit; one end of the second resistor (R2) is connected to the main control circuit, and the other end of the second resistor (R2) is connected to the control end of the switch unit 301; one end of the third resistor (R3) is between the power supply and one end of the switch unit 301, and the other end of the third resistor (R3) is connected between the other end of the switch unit 301 and the heating element; one end of the fourth resistor (R4) is connected between the other end of the switch unit 301 and the heating element, and the other end of the fourth resistor (R4) is used to access the PWM signal.

[0047] Specifically, the signal output by the main control circuit can control the switch unit to be turned on or off, and control the frequency of the signal output by the switch unit. Figure 3 As shown, the main control circuit can control the switch unit to be turned on or off through the HOT interface, and the frequency of the output signal of the switch unit can be adjusted by inputting a PWM signal through the PWM interface, so that the switching frequency exceeds the range that the human ear can hear, thereby completely eliminating the current sound when the atomizer is working. Compared with the technical solution in the traditional technology that increases the inductance to maintain the stability of the output current to reduce the sound generated by the vibration when the atomizer is output, the setting of the atomization drive circuit of the present application does not increase the production cost, and can also completely eliminate the current sound.

[0048] Furthermore, if Figure 4 As shown, the heating driving module of one embodiment further includes a first capacitor. One end of the first capacitor (C1) is connected to the other end of the fourth resistor (R4), and the other end of the first capacitor (C1) is grounded. By adding a capacitor for filtering, the stability of the output signal waveform of the heating driving module operating at the above switching frequency can be ensured.

[0049] Specifically, the switch unit of one embodiment includes at least one first MOS tube; the control end of the switch unit is the control end of the first MOS tube, one end of the switch unit is the first end of the first MOS tube, and the other end of the switch unit is the second end of the first MOS tube.

[0050] Specifically, if Figure 5 As shown, this embodiment uses a first MOS tube (Q1) to control the conduction and shutdown between the two ends of the switch unit. Exemplarily, the gate of the first MOS tube (Q1) is connected to the other end of the second resistor (R2), the source of the first MOS tube (Q1) is used to connect the power supply of the electronic cigarette, and the drain of the first MOS tube (Q1) is connected to the heating element of the electronic cigarette. It can be understood that the switch unit can also adopt other forms, not limited to the forms mentioned in the above embodiments, as long as it can realize the control of the conduction and shutdown between its two ends through the control end.

[0051] Furthermore, if Figure 6 As shown, the heating drive module of one embodiment further includes a detection unit 611. Specifically, the control end of the detection unit 611 is connected to the main control circuit 601, one end of the detection unit 611 is used to connect to the power supply 609, and the other end of the detection unit is connected between the heating element 607 and the other end of the switch unit 605.

[0052] It can be understood that the main control circuit can control the conduction and closing of the other two ends of the detection unit 611 through the control end of the detection unit 611. After the detection unit is turned on, the power supply 609 of the electronic cigarette device is connected to the heating element 607, thereby driving the heating element 607 to generate heat. By setting up the detection unit, it is possible to detect whether the connection between the atomization drive circuit and the heating element of the electronic cigarette device is normal, and whether the heating element can generate heat normally.

[0053] Specifically, Figure 7As shown, the detection unit 703 of one embodiment includes a second MOS tube (Q2), a fifth resistor (R5), and a sixth resistor (R6). Among them, the BT+ interface is used to connect the power supply of the electronic cigarette device, and the R_EN interface is connected to the main control circuit. The control end of the detection unit is the control end of the second MOS tube (Q2), one end of the detection unit 703 is the first end of the second MOS tube (Q2), and the other end of the detection unit 703 is the second end of the second MOS tube (Q2); one end of the fifth resistor (R5) is connected between the first end of the second MOS tube (Q2) and the power supply, and the other end of the fifth resistor (R5) is connected between the control end of the second MOS tube (Q2) and the main control circuit; one end of the sixth resistor (R6) is connected to the second end of the second MOS tube (Q2), and the other end of the sixth resistor (R6) is connected between the switch unit 701 and the heating element. For example, as Figure 7 As shown, the gate of the second MOS tube is connected to the main control circuit, the source of the second MOS tube is used to connect to the power supply of the electronic smoking device, and the drain of the second MOS tube is connected to one end of the sixth resistor.

[0054] For example, when detection is required, the main control circuit controls the switch unit to be turned off through the HOT interface, and controls the detection unit to be turned on through the R_EN interface. When the detection unit is turned on, the resistance of the heating element can be detected, and the main control circuit can control the power required by the output heating element according to the detected resistance. If the detection unit cannot correctly detect the resistance of the heating element after being turned on, it means that there is an abnormal connection between the atomization drive circuit and the heating element of the electronic cigarette device, and the main control circuit will give an alarm according to the abnormal connection.

[0055] It can be understood that the detection unit can also adopt other forms, not limited to the forms mentioned in the above embodiments, as long as it can achieve the control of the conduction and closing between its two ends through the control end.

[0056] Furthermore, if Figure 8 As shown, the heating drive module in one embodiment further includes a first diode (D1). The positive electrode of the first diode (D1) is grounded, and the negative electrode of the first diode (D1) is connected between the other end of the switch unit 801 and the heating element. By providing the first diode (D1), it is possible to effectively prevent the reverse voltage during operation from causing damage to key components such as the MCU.

[0057] Exemplarily, the first diode (D1) may be a 1N4148 switching diode, which may be applied to a high-speed switching circuit.

[0058] Furthermore, the switching frequency of the switch unit in one embodiment may include 20KHz; in some examples, the switching frequency of the switch unit is specifically set to be above 20kHz. At this time, the frequency of the current output by the switch unit (i.e., the output signal of the switch unit) is also above 20kHz, so that the frequency of the output current and the sound frequency of the current sound generated by the resonance of the atomizer are also above 20kHz, which is beyond the frequency range that can be heard by the human ear, and for human users, the current sound is completely eliminated.

[0059] Furthermore, in one embodiment, the number of heating drive modules is at least two. The number of heating drive modules is determined by the number of heating elements to be driven. When the electronic cigarette device needs to output high power through multiple heating elements, a corresponding number of heating drive modules needs to be matched. For example, Fig. 9 As shown, when the output power of the electronic cigarette device is relatively large, two heating elements are provided. At this time, two PWM signal control outputs are required, so its atomization drive circuit can be provided with two heating drive modules to drive each heating element respectively, so that the electronic cigarette device can completely eliminate the current sound generated by the atomizer when it is in high-power operation, thereby improving the user's product experience.

[0060] The embodiment of the present application further provides an electronic smoking device, which includes the atomization driving circuit described in the above embodiments.

[0061] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An atomization driving circuit, characterized in that: Applied to an electronic smoking device, the electronic smoking device includes a main control circuit; the atomization drive circuit includes a heating drive module, which is electrically connected to the main control circuit and is used to receive a PWM signal output by the main control circuit; The heating drive module comprises: A switch unit, wherein a control end of the switch unit is connected to the main control circuit, one end of the switch unit is used to connect to the power supply of the electronic smoking device, and the other end of the switch unit is connected to the heating element of the electronic smoking device; wherein the main control circuit controls the switching frequency of the switch unit through the PWM signal so that the switch unit generates an output signal to heat the heating element.

2. The atomization driving circuit according to claim 1, characterized in that: The heating driving module includes a first resistor, a second resistor, a third resistor and a fourth resistor; One end of the first resistor is connected between the power supply and one end of the switch unit, and the other end of the first resistor is connected between one end of the second resistor and the main control circuit; One end of the second resistor is connected to the main control circuit, and the other end of the second resistor is connected to the control end of the switch unit; One end of the third resistor is between the power supply and one end of the switch unit, and the other end of the third resistor is connected between the other end of the switch unit and the heating element; One end of the fourth resistor is connected between the other end of the switch unit and the heating element, and the other end of the fourth resistor is used to access the PWM signal.

3. The atomization driving circuit according to claim 2, characterized in that: The heating driving module also includes a first capacitor; One end of the first capacitor is connected to the other end of the fourth resistor, and the other end of the first capacitor is grounded.

4. The atomization driving circuit according to claim 2, characterized in that: The switch unit includes at least one first MOS tube; The control end of the switch unit is the control end of the first MOS tube, one end of the switch unit is the first end of the first MOS tube, and the other end of the switch unit is the second end of the first MOS tube.

5. The atomization driving circuit according to claim 1, characterized in that: The heating drive module also includes a detection unit; The control end of the detection unit is connected to the main control circuit, one end of the detection unit is used to connect to the power supply, and the other end of the detection unit is connected between the heating element and the other end of the switch unit.

6. The atomization driving circuit according to claim 5, characterized in that: The detection unit includes a second MOS tube, a fifth resistor and a sixth resistor; The control end of the detection unit is the control end of the second MOS tube, one end of the detection unit is the first end of the second MOS tube, and the other end of the detection unit is the second end of the second MOS tube; One end of the fifth resistor is connected between the first end of the second MOS transistor and the power supply, and the other end of the fifth resistor is connected between the control end of the second MOS transistor and the main control circuit; One end of the sixth resistor is connected to the second end of the second MOS tube, and the other end of the sixth resistor is connected between the switch unit and the heating element.

7. The atomization driving circuit according to any one of claims 1 to 6, characterized in that: The heating driving module also includes a first diode; The anode of the first diode is grounded, and the cathode of the first diode is connected between the other end of the switch unit and the heating element.

8. The atomization driving circuit according to any one of claims 1 to 6, characterized in that: The switching frequency of the switching unit comprises 20 KHz.

9. The atomization driving circuit according to any one of claims 1 to 6, characterized in that: The number of the heating drive modules is at least two.

10. An electronic smoking device, characterized in that: The atomization drive circuit comprises the atomization drive circuit according to any one of claims 1 to 9.

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