Electronic cigarette heating body protection structure and electronic cigarette

Abstract

The utility model discloses an electronic cigarette heating element protection structure and an electronic cigarette, the electronic cigarette heating element protection structure comprises an MCU module, a heating element, a power-on switch and a protection circuit, the protection circuit comprises a protection switch and a discharge differentiating circuit, and the discharge differentiating circuit comprises a discharge differential resistor and a discharge differential capacitor which are arranged in parallel. One end of the heating body is connected to the positive electrode end of a power supply, the other end of the heating body is connected to the negative electrode end of the power supply to form an energizing loop, the energizing loop is connected with a protection switch and an energizing switch, the energizing switch and the protection switch are electrically connected with the MCU module, and a discharge differentiating circuit is connected between the protection switch and the MCU module.

Description

Technical Field

[0001] This utility model relates to a protective structure for the heating element of an electronic cigarette and an electronic cigarette. Background Technology

[0002] Current disposable e-cigarettes, such as Figure 1 The microphone or button forms the start input signal, which is input to the MCU. After being judged by the software, the MCU outputs a PWM control signal to the PMOS transistor. The PMOS transistor conducts, and the heating element is powered on. The power and duration of the heating element are determined by the microphone or button and the MCU software control, generally not exceeding 15 seconds. If there is a bug in the MCU software or the MCU hardware itself is damaged (breakdown), the control signal output by the MCU will be a fixed, continuous low level (an abnormal PWM control signal). The PMOS transistor will time out and be fully turned on, resulting in the heating element burning out due to overpower. Summary of the Invention

[0003] The purpose of this utility model is to provide a protective structure for the heating element of an electronic cigarette, thereby solving the problems mentioned in the background art. To achieve the above objective, this utility model provides the following technical solution:

[0004] An electronic cigarette heating element protection structure includes an MCU module, a heating element, a power switch, and a protection circuit. The protection circuit includes a protection switch and a discharge differential circuit. The discharge differential circuit includes a discharge differential resistor and a discharge differential capacitor connected in parallel. One end of the heating element is connected to the positive terminal of a power supply, and the other end is connected to the negative terminal of a power supply to form a power-on circuit. The power-on circuit is connected to the protection switch and the power switch. The power switch and the protection switch are electrically connected to the MCU module, and the discharge differential circuit is connected between the protection switch and the MCU module.

[0005] Furthermore, the protection switch is an NMOS transistor, the heating element is provided with an input terminal and an output terminal, the input terminal is connected to the positive terminal of the power supply after being connected to the power switch, the output terminal is connected to the drain terminal of the NMOS transistor, the source terminal of the NMOS transistor is connected to the negative terminal of the power supply, the gate terminal of the NMOS transistor is connected to the MCU module, and one end of the discharge differentiating circuit is connected to the gate terminal of the NMOS transistor and the other end is connected to the source terminal of the NMOS transistor.

[0006] Furthermore, the heating element power-on circuit includes a heating element, a PMOS transistor, and a bias resistor. The heating element has an A terminal and a B terminal. The gate (G) of the PMOS transistor is electrically connected to the MCU module, and the source (S) of the PMOS transistor is electrically connected to the positive terminal of the power supply. One end of the bias resistor is electrically connected to the gate (G) of the PMOS transistor, and the other end is electrically connected to the source (S) of the PMOS transistor.

[0007] The B terminal is connected to the drain (D) of the PMOS transistor, and the B terminal is electrically connected to the drain (D) of the NMOS transistor.

[0008] Furthermore, a first unidirectional diode is connected between the MCU module and the gate (G) of the PMOS transistor. The anode of the first unidirectional diode is connected to the MCU module, and the cathode of the first unidirectional diode is connected to the gate (G) of the PMOS transistor. A second unidirectional diode is connected between the MCU module and the gate (G) of the PMOS transistor. The anode of the second unidirectional diode is connected to the MCU module, and the cathode of the second unidirectional diode is connected to the gate (G) of the NMOS transistor.

[0009] This utility model also provides an electronic cigarette, including the protective structure for the electronic cigarette heating element, and further including a charging interface and a charging module, wherein the charging module is connected to the charging interface and a power source respectively.

[0010] Furthermore, the power source is a lithium battery.

[0011] Furthermore, the electronic cigarette also includes a display device, which is electrically connected to the MCU module.

[0012] Furthermore, the display device is an LED or TFT display screen.

[0013] Furthermore, the electronic cigarette also includes a signal input device, which is electrically connected to the MCU module.

[0014] Furthermore, the signal input device includes a microphone and buttons.

[0015] Beneficial effects: When the heating element is working normally, if there is a software bug in the MCU module or the MCU module itself is damaged (broken down), the MCU module will emit a continuous low level. At this time, the discharge differential circuit composed of Rj and Cj will discharge, and the protection switch will be quickly turned off (usually within 3 seconds), thereby avoiding the heating element from overheating due to continuous operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a circuit diagram of the heating element in an electronic cigarette.

[0018] Figure 2 This is a diagram of the protective structure of the electronic cigarette heating element according to Embodiment 1 of this utility model;

[0019] Figure 3 This is a diagram of the protective structure of the electronic cigarette heating element according to Embodiment 2 of this utility model;

[0020] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0023] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0024] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0025] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0026] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0027] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations. Example

[0028] like Figure 2 As shown, this embodiment provides a protection structure for an electronic cigarette heating element, including an MCU module, a heating element R1, a power switch, and a protection circuit. The protection circuit includes an NMOS transistor M2 and a discharge differentiating circuit. The discharge differentiating circuit includes a discharge differentiating resistor Rj and a discharge differentiating capacitor Cj connected in parallel. The heating element R1 has an input terminal A and an output terminal B. The input terminal A is connected to the power switch and then electrically connected to the positive terminal B+ of the power supply. The output terminal B is electrically connected to the drain (D) terminal of the NMOS transistor M2. The source (S) terminal of the NMOS transistor M2 is electrically connected to the negative terminal B- of the power supply. The gate (G) terminal of the NMOS transistor M2 is electrically connected to the MCU module. One end of the discharge differentiating circuit is electrically connected to the gate (G) terminal of the NMOS transistor M2, and the other end is connected to the source (S) terminal of the NMOS transistor M2. Preferably, the heating element is a resistance wire or a metal mesh.

[0029] When the heating element is working normally, if a software bug occurs in the MCU module or the MCU module itself is damaged (breakdown), the MCU module will emit a continuous low level. At this time, the discharge differentiating circuit composed of Rj and Cj will discharge, and the NMOS transistor will be quickly turned off (usually within 3 seconds), thereby preventing the heating element from overheating due to continuous operation.

[0030] In a further embodiment of this scheme: the power switch includes a PMOS transistor M1 and a bias resistor R2. The gate (G) of the PMOS transistor M1 is electrically connected to the MCU module, and the source (S) of the PMOS transistor M1 is electrically connected to the positive terminal B+ of the power supply. One end of the bias resistor R2 is electrically connected to the gate (G) of the PMOS transistor M1, and the other end is electrically connected to the source (S) of the PMOS transistor M1. The input terminal A is connected to the drain (D) of the PMOS transistor M1.

[0031] The MCU module inputs a PWM signal to the PMOS transistor M1, controlling the power flowing through the heating element according to the PWM duty cycle. The bias resistor R2 ensures that the PMOS transistor is effectively turned off when there is no control signal.

[0032] In a further embodiment: a first unidirectional diode D1 is connected between the MCU module and the gate of the PMOS transistor M1, the anode of the first unidirectional diode D1 is connected to the MCU module, and the first unidirectional diode D1...

[0033] The negative terminal of the first unidirectional diode D1 is connected to the gate (G) of the PMOS transistor M1. A second unidirectional diode D2 is connected between the MCU module and the G of the PMOS transistor M1. The negative terminal of the second unidirectional diode D2 is connected to the MCU module, and the positive terminal of the second unidirectional diode D2 is connected to the G of the NMOS transistor. The first unidirectional diode D1 pulls down the G level of the PMOS transistor when the MCU outputs a high PWM level; at the same time, it effectively turns off the PMOS transistor to prevent the NMOS transistor from conducting when the MCU outputs a continuous high level. Example

[0034] See Figure 3 This embodiment provides a protection structure for an electronic cigarette heating element, including an MCU module, a heating element R1, a power switch, and a protection circuit. The protection circuit includes a PMOS transistor M1 and a discharge differentiating circuit. The discharge differentiating circuit includes a discharge differentiating resistor Rj and a discharge differentiating capacitor Cj connected in parallel. The heating element R1 has an input terminal A and an output terminal B. The output terminal B is connected to the power switch and then electrically connected to the negative terminal B- of the power supply. The output terminal B is also electrically connected to the drain (D) terminal of the PMOS transistor M1. The source (S) terminal of the PMOS transistor M1 is electrically connected to the positive terminal B+ of the power supply. The gate (G) terminal of the PMOS transistor M1 is electrically connected to the MCU module. One end of the discharge differentiating circuit is electrically connected to the gate (G) terminal of the PMOS transistor M1, and the other end is connected to the source (S) terminal of the PMOS transistor M1. Preferably, the heating element is a resistance wire or a metal mesh.

[0035] In a further embodiment of this scheme: the power switch includes an NMOS transistor M2 and a bias resistor R2. The gate (G) of the NMOS transistor M2 is electrically connected to the MCU module, and the source (S) of the NMOS transistor M2 is electrically connected to the negative terminal B- of the power supply. One end of the bias resistor R2 is electrically connected to the gate (G) of the NMOS transistor M1, and the other end is electrically connected to the source (S) of the PMOS transistor M1. The output terminal B is connected to the drain (D) of the PMOS transistor M1.

[0036] In a further embodiment: a first unidirectional diode D1 is connected between the MCU module and the gate of the PMOS transistor M1. The positive terminal of the first unidirectional diode D1 is connected to the MCU module, and the negative terminal of the first unidirectional diode D1 is connected to the gate of the PMOS transistor M1. A second unidirectional diode D2 is connected between the MCU module and the gate of the PMOS transistor M1. The negative terminal of the second unidirectional diode D2 is connected to the MCU module, and the positive terminal of the second unidirectional diode D2 is connected to the gate of the NMOS transistor. Example

[0037] This embodiment also provides an electronic cigarette, including the above-described electronic cigarette heating element protection structure, and further including a charging interface and a charging module, wherein the charging module is connected to the charging interface and a power source respectively.

[0038] The power supply is charged via a charging interface and charging module to meet continuous use requirements.

[0039] In a further embodiment of this invention, the power source is a lithium battery.

[0040] In a further embodiment of this invention, the electronic cigarette also includes a display device, which is electrically connected to the MCU module. Preferably, the display device is an LED or TFT display screen.

[0041] In a further embodiment of this invention, the electronic cigarette also includes a signal input device, which is electrically connected to the MCU module. Specifically, the signal input device includes a microphone and a button.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. The scope of protection of the present utility model should be determined by the scope of the claims. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A protective structure for an electronic cigarette heating element, characterized in that, The device includes an MCU module, a heating element, a power switch, and a protection circuit. The protection circuit includes a protection switch, a discharge differential circuit, and a power-on circuit for the heating element. The discharge differential circuit includes a discharge differential resistor and a discharge differential capacitor connected in parallel. One end of the heating element is connected to the positive terminal of the power supply, and the other end is connected to the negative terminal of the power supply to form a power-on loop. The power-on loop is connected to the protection switch and the power switch. The power switch and the protection switch are electrically connected to the MCU module, and the discharge differential circuit is connected between the protection switch and the MCU module.

2. The electronic cigarette heating element protection structure according to claim 1, characterized in that, The protection switch is an NMOS transistor. The heating element has an input terminal and an output terminal. The input terminal is connected to the positive terminal of the power supply after being connected to the power switch. The output terminal is connected to the drain (D) terminal of the NMOS transistor. The source (S) terminal of the NMOS transistor is connected to the negative terminal of the power supply. The gate (G) terminal of the NMOS transistor is connected to the MCU module. One end of the discharge differentiating circuit is connected to the gate (G) terminal of the NMOS transistor, and the other end is connected to the source (S) terminal of the NMOS transistor.

3. The electronic cigarette heating body protection structure according to claim 2, characterized in that: The heating element power-on circuit includes a heating element, a PMOS transistor, and a bias resistor. The heating element has an A terminal and a B terminal. The gate (G) of the PMOS transistor is electrically connected to the MCU module, and the source (S) of the PMOS transistor is electrically connected to the positive terminal of the power supply. One end of the bias resistor is electrically connected to the gate (G) of the PMOS transistor, and the other end is electrically connected to the source (S) of the PMOS transistor. The A terminal is connected to the drain (D) of the PMOS transistor, and the B terminal is electrically connected to the drain (D) of the NMOS transistor.

4. The electronic cigarette heating body protection structure according to claim 2, characterized in that: A first unidirectional diode is connected between the MCU module and the gate (G) of the PMOS transistor. The anode of the first unidirectional diode is connected to the MCU module, and the cathode of the first unidirectional diode is connected to the gate (G) of the PMOS transistor. A second unidirectional diode is connected between the MCU module and the gate (G) of the PMOS transistor. The anode of the second unidirectional diode is connected to the MCU module, and the cathode of the second unidirectional diode is connected to the gate (G) of the NMOS transistor.

5. An electronic cigarette comprising the electronic cigarette heating element protection structure according to any one of claims 1 to 4, characterized in that: It also includes a charging interface and a charging module, wherein the charging module is connected to the charging interface and the power source, respectively.

6. The electronic cigarette of claim 5, wherein: The power source is a lithium battery.

7. An electronic cigarette according to claim 5, characterized in that: The electronic cigarette also includes a display device, which is electrically connected to the MCU module.

8. The electronic cigarette of claim 7, wherein: The display device is an LED or TFT display screen.

9. The electronic cigarette of claim 5, wherein: The electronic cigarette also includes a signal input device, which is electrically connected to the MCU module.

10. The electronic cigarette of claim 9, wherein: The signal input device includes a microphone and buttons.

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