An over-inhalation protection circuit for electronic cigarette microphone malfunctions
By integrating a dual timing subunit with a microprocessor and a MOSFET-controlled heating circuit into the electronic cigarette, the problem of insufficient over-inhalation protection in existing electronic cigarettes is solved, achieving dual protection against microphone malfunctions and improving safety and visibility.
Patent Information
- Application Number
- CN202521863047.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-31
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-08-31
AI Technical Summary
Existing electronic cigarettes' over-inhalation protection function has a short duration and cannot effectively cope with the intermittent triggering of microphone malfunctions, leading to the risk of overheating of the oil cup, burning of the oil reservoir cotton, or oil leakage causing burns.
It adopts a dual timing subunit integrated with a microprocessor, sets the single over-suction protection threshold to 10 seconds, monitors the cumulative suction time of 30 seconds in non-sleep mode, and controls the heating circuit through a MOS tube. Combined with red and white LED status indicators, it achieves dual protection against microphone malfunctions.
It effectively prevents safety hazards caused by prolonged heating, improves safety during use, has good practicality and visibility, avoids misoperation, and provides dual protection.
Smart Images
Figure CN224936606U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic cigarette technology, specifically to an over-inhalation protection circuit for an electronic cigarette microphone malfunction. Background Technology
[0002] In the e-cigarette industry, a malfunction in the microphone can cause the e-cigarette to self-start. Prolonged heating can damage the e-liquid cup or reservoir, and in severe cases, lead to leakage and burns to the user. Currently, only over-inhalation protection offers some protection against microphone self-starting malfunctions. However, the protection time for over-inhalation is generally short, usually around 3 seconds. Repeated over-inhalation triggers can cause the e-liquid cup to overheat, posing even greater risks. If the microphone self-starting is intermittent, repeated, and continuous, current technology cannot provide protection. Even if the microphone malfunctions and repeatedly triggers the over-inhalation protection, or intermittent, repeated, and continuous triggers, the risk of overheating the e-liquid cup or leaks and burns remains. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide an over-inhalation protection circuit for electronic cigarette microphone malfunctions, so as to solve the technical defects of existing electronic cigarettes that only rely on short-term over-inhalation protection functions and cannot effectively deal with the self-starting of microphone malfunctions, thereby causing the risk of overheating of the oil cup, burning of the oil storage cotton, or even oil leakage and burns.
[0004] To solve the above-mentioned technical problems, embodiments of this utility model provide the following technical solution: an over-inhalation protection circuit for an electronic cigarette microphone malfunction, comprising a microprocessor, a power supply module, a microphone detection module, a data communication module, a status indicator module, a heating control module, and a button module. The microprocessor is electrically connected to the power supply module, the microphone detection module, the data communication module, the status indicator module, the heating control module, and the button module. The microprocessor also integrates a timing circuit. The signal output terminal of the microphone detection module is connected to the signal input terminal of the microprocessor, and is used to output a suction start signal to the microprocessor. The timing circuit is coupled to the control unit and is used to monitor the single over-absorption time and the cumulative aspiration time in the non-dormant state. The heating control module is connected to the output of the microprocessor and is used to execute the action of prohibiting smoking; The status indicator module illuminates a red light when the single over-inhalation time and the cumulative inhalation time in the non-dormant state exceed the threshold, triggering a smoking ban action.
[0005] Furthermore, the timing circuit includes an over-inhalation timing subunit and a cumulative inhalation timing subunit; the over-inhalation timing subunit is used to monitor the duration of a single inhalation in real time and determine whether the 10-second over-inhalation threshold has been reached; the cumulative inhalation timing subunit is used to continuously accumulate the inhalation time when the electronic cigarette is not in sleep mode and determine whether it exceeds the 30-second threshold.
[0006] Furthermore, the heating control module includes a MOSFET, which is connected in series in the heating circuit of the electronic cigarette. The gate of the MOSFET is connected to the output pin of the microprocessor. When the microprocessor outputs an inhibit signal, the MOSFET is turned off and the heating circuit is disconnected. When the control unit outputs an enable signal, the MOSFET is turned on and the heating circuit is connected.
[0007] Furthermore, the status indicator module includes a red LED and a white LED, which are respectively connected to the PWM output pin of the control unit. In the protection state, the red LED flashes, and in the normal state, the white LED is always on.
[0008] Furthermore, the microphone detection module employs a capacitive airflow sensor.
[0009] Furthermore, the power module is a lithium battery.
[0010] Furthermore, the microprocessor is a single-chip microcomputer.
[0011] Furthermore, the data communication module is a serial communication module.
[0012] The beneficial effects of the above-mentioned technical solution of this utility model are as follows: 1. This circuit effectively solves the limitations of existing electronic cigarette over-inhalation protection functions, significantly improving user safety. Existing technology typically provides over-inhalation protection for only 3 seconds and cannot handle intermittent triggering caused by microphone malfunctions, easily leading to risks such as overheating of the e-liquid cup and burns from leakage. This circuit, however, uses a dual-timing subunit integrated into the microprocessor to set a single over-inhalation protection threshold of 10 seconds, while simultaneously monitoring the cumulative inhalation time over 30 seconds in non-sleep mode. Regardless of whether the microphone continuously malfunctions and restarts automatically or triggers intermittently, if either threshold is exceeded, the microprocessor will control the MOSFET of the heating control module to cut off, disconnecting the heating circuit. This fundamentally avoids the safety hazards caused by prolonged heating, providing dual protection for both the user and the device.
[0013] 2. This circuit balances status visibility with ease of operation, and possesses excellent practicality and debuggability. The status indicator module uses red and white LEDs to distinguish the operating status; the white LED is constantly lit during normal operation, and the red LED flashes during protection. Users can intuitively judge the device's operating status and avoid misoperation due to unclear status. The button module only requires pressing to start the device, making operation simple and easy to understand; it also includes a serial communication module for convenient later debugging of circuit parameters and data transmission. Attached Figure Description
[0014] Figure 1 This is a block diagram of the over-inhalation protection circuit for an electronic cigarette microphone according to this utility model. Figure 2 This is a schematic diagram of the microprocessor circuit for the over-inhalation protection circuit of the electronic cigarette microphone according to this utility model. Figure 3 This is a circuit diagram of the data communication module of the electronic cigarette microphone fault over-inhalation protection circuit of this utility model; Figure 4 This is a schematic diagram of the interface circuit of the microphone detection module for the electronic cigarette microphone fault over-inhalation protection circuit of this utility model; Figure 5 This is a circuit diagram of the status indicator module for the over-inhalation protection circuit of the electronic cigarette microphone according to this utility model; Figure 6 This is a schematic diagram of the button module circuit for the over-inhalation protection circuit of the electronic cigarette microphone according to this utility model. Detailed Implementation
[0015] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.
[0016] like Figure 1 As shown, this utility model proposes an over-inhalation protection circuit for an electronic cigarette microphone, including a microprocessor 1, a power supply module 2, a microphone detection module 3, a data communication module 4, a status indication module 5, a heating control module 6, and a button module 7. The microprocessor 1 is electrically connected to the power supply module 2, the microphone detection module 3, the data communication module 4, the status indication module 5, the heating control module 6, and the button module 7. The microprocessor 1 also integrates a timing circuit, wherein: The signal output terminal of the microphone detection module 3 is connected to the signal input terminal of the microprocessor 1, and is used to output a suction start signal to the microprocessor 1; The timing circuit is coupled to the control unit to monitor the single over-absorption time and the cumulative aspiration time in the non-dormant state; The heating control module 6 is connected to the output of the microprocessor 1 and is used to execute the action of prohibiting smoking. When the status indicator module 5 exceeds the threshold for both single over-inhalation time and cumulative inhalation time in non-dormant state, triggering the prohibition of smoking action, a red light will illuminate.
[0017] The timing circuit includes an over-inhalation timing subunit and a cumulative inhalation timing subunit. The over-inhalation timing subunit is used to monitor the duration of a single inhalation in real time and determine whether the 10-second over-inhalation threshold has been reached. The cumulative inhalation timing subunit is used to continuously accumulate the inhalation time when the electronic cigarette is not in sleep mode and determine whether the 30-second threshold has been exceeded.
[0018] The heating control module 6 includes a MOSFET connected in series in the heating circuit of the electronic cigarette. The gate of the MOSFET is connected to the output pin of the microprocessor 1. When the microprocessor 1 outputs an inhibit signal, the MOSFET is turned off and the heating circuit is disconnected. When the control unit outputs an enable signal, the MOSFET is turned on and the heating circuit is connected.
[0019] Status indicator module 5 includes a red LED and a white LED, which are respectively connected to the PWM output pin of the control unit. In the protection state, the red LED flashes; in the normal state, the white LED remains constantly lit. The circuit of status indicator module 5 is as follows: Figure 5 As shown.
[0020] Microphone detection module 3 uses a capacitive airflow sensor. The interface circuit of microphone detection module 3 is as follows: Figure 4 As shown, when the user inhales, the change in airflow causes a change in the capacitance value inside the microphone, which is converted into a voltage signal change by the internal circuit and input to the microprocessor through the MIC pin.
[0021] Power module 2 is a lithium battery, and its output terminal B+ is connected to... Figure 2 Pins 6, 7, and 20-24 of the circuit shown are also connected to Figure 3 The serial communication circuit shown Figure 4 Microphone detection module 3 interface circuit and Figure 6 The button circuit.
[0022] Microprocessor 1 is a single-chip microcomputer, such as Figure 2 The diagram shown is a schematic of the microprocessor circuit of this invention. Pins 16 and 17 are LEDR and LEDW, respectively, connected to the red and white LEDs of the aforementioned status indicator module; pin 9, KEY, is the key circuit signal pin, connected to... Figure 6 The button circuit shown provides a low-level input to the KEY pin when the button is pressed, activating the electronic cigarette. The MIC pin is connected to... Figure 4 The microphone detection module interface circuit is used to receive the microphone detection signal.
[0023] Pin 21 is MOS_EXT, connected to the gate of the MOSFET. Pins 1, 2, and 3 are simultaneously connected to TO+, serving as the positive terminal of the heating module, and connected to the drain of the MOSFET. The source of the MOSFET is then connected to TO-, ground, forming a complete control loop. When the control signal output by MOS_EXT turns the gate and source of the MOSFET on, the entire heating loop is powered on and heating occurs. Conversely, when the microprocessor outputs a heating disable signal through MOS_EXT, the MOSFET is turned off, and the heating loop stops working.
[0024] Pins 13 and 14 connect to the data communication module. Data communication module 4 is a serial communication module. The serial communication module's communication circuit is as follows: Figure 3 As shown.
[0025] The circuit of this invention uses a microcontroller as the microprocessor, paired with a lithium battery-powered power module. Through the collaborative operation of multiple modules, it achieves over-draw protection in case of microphone failure. The specific workflow is illustrated in the following embodiment: First, the power module (lithium battery) supplies power to all units, including the microprocessor, microphone detection module, and heating control module, through the output terminal B+, ensuring the overall operation of the circuit. When the user presses the button module, the KEY pin inputs a low level, and the electronic cigarette starts working.
[0026] Secondly, the microphone detection module uses a capacitive airflow sensor. When the user inhales, the change in airflow causes the capacitance value inside the sensor to change, which is converted into a voltage signal by the circuit and transmitted to the microprocessor through the MIC pin as an inhalation start signal. If the microphone malfunctions and restarts automatically, it will also continuously output this signal to the microprocessor.
[0027] The timing circuit integrated within the microprocessor works synchronously and is divided into an over-inhalation timing subunit and a cumulative inhalation timing subunit: the over-inhalation timing subunit monitors the duration of a single inhalation in real time and determines whether it has reached the 10-second threshold; the cumulative inhalation timing subunit continuously accumulates the inhalation time when the electronic cigarette is not in sleep mode and determines whether it has exceeded the 30-second threshold.
[0028] If the threshold is not exceeded, the microprocessor outputs an enable signal through pin 21 (MOS_EXT), which turns on the MOS transistor in the heating control module, connects the heating circuit (TO+→MOS transistor drain→source→TO- ground), and the electronic cigarette heats normally. At the same time, the white LED of the status indicator module (connected to the microprocessor's PWM pin) is constantly lit, indicating a normal state.
[0029] If a single over-inhalation exceeds 10 seconds or the cumulative inhalation exceeds 30 seconds (due to microphone malfunction causing continuous / intermittent triggering), the microprocessor immediately outputs a prohibition signal, cutting off the MOSFET, disconnecting the heating circuit, and prohibiting smoking. At this time, the red LED of the status indicator module flashes to indicate the protection status. In addition, the microprocessor can also realize data transmission or debugging through the serial communication module connected to pins 13 and 14, further ensuring the controllability of the circuit.
[0030] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. An over-inhalation protection circuit for an electronic cigarette microphone malfunction, characterized in that, The system includes a microprocessor (1), a power supply module (2), a microphone detection module (3), a data communication module (4), a status indicator module (5), a heating control module (6), and a button module (7). The microprocessor (1) is electrically connected to the power supply module (2), the microphone detection module (3), the data communication module (4), the status indicator module (5), the heating control module (6), and the button module (7). The microprocessor (1) also integrates a timing circuit. The signal output terminal of the microphone detection module (3) is connected to the signal input terminal of the microprocessor (1) and is used to output a suction start signal to the microprocessor (1); The timing circuit is coupled to the control unit and is used to monitor the single over-absorption time and the cumulative aspiration time in the non-dormant state. The heating control module (6) is connected to the output of the microprocessor (1) and is used to perform the action of prohibiting smoking; When the status indicator module (5) exceeds the threshold for the single over-inhalation time and the cumulative inhalation time in the non-dormant state, triggering the prohibition of smoking action, the red light indicator will be lit. The timing circuit includes an over-inhalation timing subunit and a cumulative inhalation timing subunit; the over-inhalation timing subunit is used to monitor the duration of a single inhalation in real time and determine whether the 10-second over-inhalation threshold has been reached; the cumulative inhalation timing subunit is used to continuously accumulate the inhalation time when the electronic cigarette is not in sleep mode and determine whether the 30-second threshold has been exceeded.
2. The electronic cigarette microphone over-inhalation protection circuit according to claim 1, characterized in that, The heating control module (6) includes a MOS transistor connected in series in the heating circuit of the electronic cigarette. The gate of the MOS transistor is connected to the output pin of the microprocessor (1). When the microprocessor (1) outputs a prohibition signal, the MOS transistor is turned off and the heating circuit is disconnected. When the control unit outputs an enable signal, the MOS transistor is turned on and the heating circuit is connected.
3. The electronic cigarette microphone over-inhalation protection circuit according to claim 1, characterized in that, The status indicator module (5) includes a red LED and a white LED. The red LED and the white LED are respectively connected to the PWM output pin of the control unit. In the protection state, the red LED flashes, and in the normal state, the white LED is always on.
4. The electronic cigarette microphone over-inhalation protection circuit according to claim 1, characterized in that, The microphone detection module (3) uses a capacitive airflow sensor.
5. The electronic cigarette microphone over-inhalation protection circuit according to claim 1, characterized in that, The power module (2) is a lithium battery.
6. The electronic cigarette microphone over-inhalation protection circuit according to claim 1, characterized in that, The microprocessor (1) is a single-chip microcomputer.
7. The electronic cigarette microphone over-inhalation protection circuit according to claim 1, characterized in that, The data communication module (4) is a serial communication module.