Cigarette lighter control circuit with Lightning interface
By connecting the cigarette lighter control circuit via the Lightning interface to an Apple phone, the problems of frequent replacement and safety risks associated with traditional lighters are solved, achieving a safe and long-lasting cigarette lighting function.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN GUOPAN SEMICONDUCTOR TECHNOLOGY CO LTD
- Filing Date
- 2026-02-04
- Publication Date
- 2026-04-24
AI Technical Summary
Traditional lighters require regular replacement, pose safety risks due to their flammability and explosiveness, and are also detrimental to environmental protection.
Design a cigarette lighter control circuit with a Lightning interface, including a Lightning male connector module, a cigarette lighter verification module, a control module, and a heating wire control module. It connects to the Lightning interface of an Apple mobile phone to realize power supply and signal transmission, perform data interaction verification, and control the heating wire.
It enables safe cigarette lighting without the need for pre-filling chemical fuels, extends the lifespan of the cigarette lighter, and avoids the problems of frequent replacement and flammability/explosion.
Smart Images
Figure CN121916486A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of cigarette lighters, specifically to a cigarette lighter control circuit with a Lightning interface. Background Technology
[0002] Lighting a cigarette is a crucial part of the smoking process. Traditionally, cigarettes are lit using a lighter with built-in fuel and an electric spark device. These lighters are typically disposable and need to be replaced when the fuel runs out. For smokers, this means regularly replacing lighters, which is environmentally unfriendly. Furthermore, because the lighter contains pre-installed fuel, there is a possibility of explosion when exposed to an open flame or heat, endangering personal safety. In certain high-safety-requirement locations, these lighters are explicitly prohibited. Summary of the Invention
[0003] This application provides a cigarette lighter control circuit with a Lightning interface to solve the problems mentioned in the background art, such as the need for regular replacement of traditional lighters and their flammability and explosiveness.
[0004] To address the aforementioned technical problems, this application provides a cigarette lighter control circuit with a Lightning interface, comprising: The Lightning male connector module is used to connect to the Lightning female connector of Apple phones, providing power supply and signal connection between the phone and the cigarette lighter. The cigarette lighter verification module is used for data interaction verification with Apple mobile phones, enabling the phone to recognize the cigarette lighter as an OTG type accessory device; The control module is used to detect the trigger signal of the cigarette lighter and control the heating element. A cigarette lighting signal acquisition module is used to acquire a cigarette lighting signal and send it to the control module; The heating wire control module is used to heat the heating wire according to the heating signal sent by the control module.
[0005] In one embodiment, the Lightning male connector module includes a physical layer bridging unit for transmitting and converting signal, power, and identification information of the Lightning interface, enabling the cigarette lighter authentication module to communicate with Apple devices in a standard manner.
[0006] In one embodiment, the cigarette lighter verification module includes a signal transmission unit for directly connecting the UART interface and SDQ single-bus interface to the Apple mobile phone's Lightning interface via a data link.
[0007] In one embodiment, the control module includes a control unit for acquiring the trigger signal from the cigarette lighter and controlling the heating element.
[0008] In one embodiment, the control module further includes an indicator light unit, which is electrically connected to the control unit and is used to display the working status of the cigarette lighter according to the control signal from the control unit.
[0009] In one embodiment, the control module further includes a fourth capacitor for filtering out noise on the power line and ensuring stable power supply to the control unit.
[0010] In one embodiment, the control module further includes a current-limiting resistor unit to prevent excessive current from burning out the indicator light unit.
[0011] In one embodiment, the cigarette lighting signal acquisition module includes a microphone unit, a third MOSFET, a third capacitor, a seventh resistor, an eighth resistor, and a tenth resistor. One end of the third capacitor is connected to the output terminal of the microphone unit, and the other end is connected to the gate of the third MOSFET. One end of the seventh resistor is connected to the power supply, and the other end is connected to the drain of the third MOSFET. The source of the third MOSFET is connected to ground. The eighth resistor is connected in parallel with the seventh resistor, and one end of the eighth resistor is connected to the output terminal of the microphone unit. One end of the tenth resistor is connected to one end of the third capacitor, and the other end is connected to ground.
[0012] In one embodiment, the heating wire control module includes a first MOSFET, a second MOSFET, a first resistor, a second resistor, a third resistor, a first capacitor, and a heating wire. One end of the first capacitor and one end of the heating wire are respectively connected to a power supply. The other end of the heating wire is respectively connected to one end of the first resistor and the drain of the first MOSFET. The other end of the first resistor is connected to the drain of the second MOSFET. One end of the second resistor is connected to the gate of the second MOSFET, and the other end is connected to the source of the second MOSFET. One end of the third resistor is connected to the gate of the first MOSFET, and the other end is connected to the source of the first MOSFET.
[0013] In one embodiment, the first MOS transistor and the second MOS transistor are N-channel MOS transistors.
[0014] The advantages of the aforementioned Lightning interface cigarette lighter control circuit are as follows: Through the integrated cigarette lighter verification module, it can complete the MFi protocol handshake with an Apple mobile phone, enabling the phone to recognize it as a certified OTG accessory, thereby legally opening the power output and data communication channel. Cigarettes are lit by powering the Apple mobile phone battery through the Lightning interface, eliminating the need for pre-filling with chemical fuel. There is no risk of flammability or explosion when not in use. At the same time, after the cigarette lighting signal acquisition module (captures / collects) the cigarette lighting information, the control module controls the heating wire control module to light the cigarette by heating the heating wire, greatly extending the service life of the cigarette lighter and eliminating the need for frequent replacements like lighters. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of a cigarette lighter control circuit with a Lightning interface, as shown in an embodiment of this application. Figure 2 for Figure 1 This application embodiment shows a circuit diagram of a Lightning male connector module for a cigarette lighter control circuit with a Lightning interface; Figure 3 for Figure 1 This application embodiment shows a circuit diagram of a cigarette lighter verification module for a cigarette lighter control circuit with a Lightning interface; Figure 4 for Figure 1 The embodiment of this application shows a control module circuit diagram of a cigarette lighter control circuit with a Lightning interface; Figure 5 for Figure 1 This application embodiment shows a circuit diagram of the cigarette lighter signal acquisition module of the cigarette lighter control circuit with a Lightning interface; Figure 6 for Figure 1 This application embodiment shows a circuit diagram of the heating wire control module of a cigarette lighter control circuit with a Lightning interface. Detailed Implementation
[0016] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0017] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediary component present. Conversely, when a component is said to be "directly" connected to another component, there is no intermediary component.
[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0019] like Figure 1 As shown, this application provides a cigarette lighter control circuit with a Lightning interface, including: like Figure 2 As shown, Lightning male module 1 is used to connect to the Lightning female connector of an Apple phone, providing power supply and signal connection between the phone and the cigarette lighter; The Lightning male connector module 1 includes a physical layer bridging unit U1, which is used to transmit and convert the signal, power and identification information of the Lightning interface, so that the cigarette lighter verification module can communicate with Apple devices in a standard manner.
[0020] like Figure 3 As shown, the cigarette lighter verification module 2 is used for data interaction verification with the Apple mobile phone, allowing the mobile phone to recognize the cigarette lighter as an OTG type accessory device; The cigarette lighter verification module 2 includes a signal transmission unit U2, which is used as a data link port for direct communication between the UART interface and the SDQ single bus interface and the Apple mobile phone Lightning interface.
[0021] VCC_ACP provides a unified operating power supply for the physical layer bridging unit U1 and the signal transmission unit U2, ensuring consistent ground potential across the entire link. (The male-connected physical layer bridging unit U1 achieves the same interface functionality whether inserted into an Apple phone with side A facing up or side B facing up.)
[0022] The TXD / RXD signals output from pins B3 and B2 of the physical layer bridging unit U1 are connected to the TX / RX pins of the signal transmission unit U2, used by an external host (such as an MCU) to send commands to the signal transmission unit U2 and receive return data. The UART interface and SDQ single-bus interface of the signal transmission unit U2 are directly connected to the Apple phone's Lightning interface for data linking. The drive capability is enhanced by pull-up resistor R4 and diode D1, and the data is finally sent back to the Apple device through the ID0 pin. This allows the cigarette lighter verification module 2 to communicate with the Apple device via standard protocols, and enables the phone to recognize the cigarette lighter as an OTG accessory device and power it via VCC_ACP.
[0023] like Figure 4 As shown, control module 3 is used to detect the trigger signal of the cigarette lighter and control the heating element. The control module 3 includes a control unit U4, which is used to acquire the trigger signal of the cigarette lighter and control the heating of the heating wire.
[0024] Pin P12 of control unit U4 is connected to cigarette lighting signal acquisition module 4 for acquiring cigarette lighting signals; pins P01 and P05 of control unit U4 are connected to heating wire control module 5 for controlling the start of heating wire control module 5. Pin P04 is connected to indicator light unit to control the indicator light unit to turn on and off.
[0025] The control module 3 also includes an indicator light unit, which is electrically connected to the control unit U4 and is used to display the working status of the cigarette lighter according to the control signals from the control unit U4. The indicator light unit includes a red LED D2 and a green LED D3. For example, when the cigarette lighter is heating, the control unit U4 controls the red LED D2 to light up; when the cigarette lighter is not heating, the control unit U4 controls the green LED D3.
[0026] The control module 3 also includes a fourth capacitor C4, which is used to filter out noise on the power line and ensure stable power supply to the control unit. The fourth capacitor C4 is connected between VCC_ACP and ground and is a high-frequency decoupling capacitor used to filter out noise on the power line and ensure stable power supply to the control unit U4.
[0027] The control module 3 also includes a current-limiting resistor unit to prevent excessive current from burning out the indicator light unit. The current-limiting resistor unit includes a fifth resistor R5 and a sixth resistor R6. The fifth resistor R5 is connected in series with the red LED D2, and the sixth resistor R6 is connected in series with the green LED D3.
[0028] like Figure 5 As shown, the cigarette lighting signal acquisition module 4 is used to acquire the cigarette lighting signal and send it to the control module 3; The cigarette lighting signal acquisition module 4 includes a microphone unit U3, a third MOSFET Q3, a third capacitor C3, a seventh resistor R7, an eighth resistor R8, and a tenth resistor R10. One end of the third capacitor C3 is connected to the output terminal of the microphone unit U3, and the other end is connected to the gate of the third MOSFET Q3. One end of the seventh resistor R7 is connected to the power supply VCC_ACP, and the other end is connected to the drain of the third MOSFET Q3. The source of the third MOSFET Q3 is connected to ground. The eighth resistor R8 is connected in parallel with the seventh resistor R7, and one end is connected to the output terminal of the microphone unit U3. One end of the tenth resistor R10 is connected to one end of the third capacitor C3, and the other end is connected to ground.
[0029] The third MOSFET, Q3, is an N-channel MOSFET. The common connection point between the third MOSFET Q3 and the seventh resistor R7 is connected to pin P12 of the control unit U4. The MIC+ pin of the microphone unit U3 is the signal output terminal, and the MIC- pin is grounded, forming a single-ended output. The third MOSFET Q3 is used as a source follower, serving as a buffer and impedance matcher. It converts the high-impedance signal output by the microphone unit U3 into a low-impedance signal, facilitating subsequent circuit processing. The seventh resistor R7 connects VCC_ACP to the drain of the third MOSFET Q3, providing operating power to Q3; the tenth resistor R10 provides DC bias to the source; the eighth resistor R8 connects VCC_ACP to the MIC+ pin of the microphone unit U3, providing DC bias voltage to the microphone unit U3.
[0030] When the cigarette lighter needs to be activated, blow forcefully into microphone unit U3. Microphone unit U3 converts the sound into a weak AC signal, which is output from the MIC+ pin. The signal passes through the third capacitor C3, a DC blocking capacitor, to filter out the DC bias, retaining only the AC audio signal, which is then sent to the gate of the third MOSFET Q3. The third MOSFET Q3 acts as a source follower, converting the high-impedance input signal into a low-impedance signal, which is output from the drain to the P12 pin of control unit U4, sending the cigarette lighter signal to control unit U4.
[0031] like Figure 6 As shown, the heating wire control module 5 is used to heat the heating wire according to the heating signal sent by the control module 3.
[0032] The heating wire control module 5 includes a first MOSFET Q1, a second MOSFET Q2, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, and a heating wire L1. One end of the first capacitor C1 and one end of the heating wire L1 are connected to the power supply VCC_ACP. The other end of the heating wire L1 is connected to one end of the first resistor R1 and the drain of the first MOSFET Q1. The other end of the first resistor R1 is connected to the drain of the second MOSFET Q2. One end of the second resistor R2 is connected to the gate of the second MOSFET Q2, and the other end is connected to the source of the second MOSFET Q2. One end of the third resistor R3 is connected to the gate of the first MOSFET Q1, and the other end is connected to the source of the first MOSFET Q1. The first MOSFET Q1 and the second MOSFET Q2 are N-channel MOSFETs.
[0033] First capacitor C1: Input filter capacitor, which filters out high-frequency noise on the power line to ensure stable power supply; heating wire L1: Heating element.
[0034] The first MOSFET Q1 controls the power supply to the heating element. When the P01 pin of the control unit U4 sends a high level to the gate of the first MOSFET Q1, Q1 conducts, and the current flows sequentially through VCC_ACP → heating wire L1 → first MOSFET Q1 → ground, and the heating element operates. When the gate is low, Q1 is off, and the heating element stops operating. The second MOSFET Q2 controls the power supply to the heating element. When the P01 pin of the control unit U4 sends a high level to the gate of the second MOSFET Q2, Q2 conducts, and the current flows sequentially through VCC_ACP → heating wire L1 → first resistor R1 → second MOSFET Q2 → ground, and the heating element operates. When the gate is low, Q2 is off. Both Q1 and Q2 are used to control heating. The second MOSFET Q2 is connected in series with a 1-ohm first resistor R1 to reduce the heating power by decreasing the current. The output heating power is adjusted by continuously switching the control switches of the first and second MOSFETs Q1 and Q2.
[0035] The first resistor R1 is a pull-up resistor that pulls the gate of the first MOSFET Q1 high when the PWM_CONTROL signal is high, ensuring that the first MOSFET Q1 is reliably turned on. The second resistor is a pull-down resistor that pulls the gate of the second MOSFET Q2 low when the POWER_CONTROL signal is low, ensuring that the second MOSFET Q2 is reliably turned off. The third resistor R3 is a pull-down resistor that pulls the gate of the first MOSFET Q1 low when the second MOSFET Q2 is turned off, ensuring that the first MOSFET Q1 is reliably turned off and preventing false triggering.
[0036] When the cigarette lighter starts working, VCC_ACP is powered on. The first capacitor C1 and the heating wire L1 filter the power supply to provide a stable power supply for the circuit. When the POWER_CONTROL signal is high, the second MOSFET Q2 is turned on. At this time, the PWM_CONTROL signal can be transmitted to the gate of the first MOSFET Q1 through the second MOSFET Q2.
[0037] When PWM_CONTROL is high, the gate of the first MOSFET Q1 is pulled high, the first MOSFET Q1 is turned on, and the heating element is powered on and generates heat.
[0038] When PWM_CONTROL is low, the gate of the first MOSFET Q1 is pulled low, and Q1 is turned off, so the heating element stops heating. When the POWER_CONTROL signal is low, the second MOSFET Q2 is turned off, and the gate of the first MOSFET Q1 is pulled low by the third resistor R3. Regardless of the PWM_CONTROL state, the heating element will not work.
[0039] When the cigarette lighter is needed, insert it into the Lightning connector of the Apple phone. The cigarette lighter verification module 2 performs data interaction verification with the Apple phone, allowing the phone to recognize the cigarette lighter as an OTG accessory and supply power to it. When lighting a cigarette, blow air into the microphone unit U3 of the cigarette lighting signal acquisition module 4. After acquiring the cigarette lighting signal, the cigarette lighting signal acquisition module 4 sends the signal to the control module 3. The control module 3, through the heating wire control module 5, controls the heating wire to heat up until the temperature requirement for lighting the cigarette is met.
[0040] In this way, a Lightning interface cigarette lighter control circuit, through an integrated cigarette lighter verification module, can complete an MFi protocol handshake with an Apple phone, enabling the phone to recognize it as a certified OTG accessory. This legally enables power output and data communication channels, allowing cigarettes to be lit by the Apple phone's battery powered by the Lightning interface. No pre-filled chemical fuel is required, and there are no flammable or explosive safety risks when not in use. Furthermore, after the cigarette lighting signal acquisition module (captures / collects) the lighting information, the control module controls the heating wire control module to light the cigarette by heating the heating wire, greatly extending the lifespan of the cigarette lighter and eliminating the need for frequent replacements like a lighter.
[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.
[0042] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A cigarette lighter control circuit with a Lightning interface, characterized in that... :include: The Lightning male connector module is used to connect to the Lightning female connector of Apple phones, providing power supply and signal connection between the phone and the cigarette lighter. The cigarette lighter verification module is used for data interaction verification with Apple mobile phones, enabling the phone to recognize the cigarette lighter as an OTG type accessory device; The control module is used to detect the trigger signal of the cigarette lighter and control the heating element. A cigarette lighting signal acquisition module is used to acquire a cigarette lighting signal and send it to the control module; The heating wire control module is used to heat the heating wire according to the heating signal sent by the control module.
2. The cigarette lighter control circuit with a Lightning interface according to claim 1, characterized in that... The Lightning male connector module includes a physical layer bridging unit for transmitting and converting the signal, power, and identification information of the Lightning interface, enabling the cigarette lighter authentication module to communicate with Apple devices in a standard manner.
3. The cigarette lighter control circuit with a Lightning interface according to claim 2, characterized in that... The cigarette lighter verification module includes a signal transmission unit, which is used as a data link port for direct communication between the UART interface and the SDQ single-bus interface and the Apple mobile phone Lightning interface.
4. The cigarette lighter control circuit with a Lightning interface according to claim 3, characterized in that... : The control module includes a control unit, which is used to acquire the trigger signal of the cigarette lighter and control the heating of the heating wire.
5. The cigarette lighter control circuit with a Lightning interface according to claim 4, characterized in that... The control module also includes an indicator light unit, which is electrically connected to the control unit and is used to display the working status of the cigarette lighter according to the control signal from the control unit.
6. The cigarette lighter control circuit with a Lightning interface according to claim 5, characterized in that... The control module also includes a fourth capacitor, which is used to filter out noise on the power line and ensure stable power supply to the control unit.
7. The cigarette lighter control circuit with a Lightning interface according to claim 6, characterized in that... The control module also includes a current-limiting resistor unit to prevent excessive current from burning out the indicator light unit.
8. The cigarette lighter control circuit with a Lightning interface according to claim 7, characterized in that... The cigarette lighting signal acquisition module includes a microphone unit, a third MOSFET, a third capacitor, a seventh resistor, an eighth resistor, and a tenth resistor. One end of the third capacitor is connected to the output terminal of the microphone unit, and the other end is connected to the gate of the third MOSFET. One end of the seventh resistor is connected to the power supply, and the other end is connected to the drain of the third MOSFET. The source of the third MOSFET is connected to ground. The eighth resistor is connected in parallel with the seventh resistor, and one end is connected to the output terminal of the microphone unit. One end of the tenth resistor is connected to one end of the third capacitor, and the other end is connected to ground.
9. The cigarette lighter control circuit with a Lightning interface according to claim 8, characterized in that... The heating wire control module includes a first MOSFET, a second MOSFET, a first resistor, a second resistor, a third resistor, a first capacitor, and a heating wire. One end of the first capacitor and one end of the heating wire are respectively connected to a power supply. The other end of the heating wire is respectively connected to one end of the first resistor and the drain of the first MOSFET. The other end of the first resistor is connected to the drain of the second MOSFET. One end of the second resistor is connected to the gate of the second MOSFET, and the other end is connected to the source of the second MOSFET. One end of the third resistor is connected to the gate of the first MOSFET, and the other end is connected to the source of the first MOSFET.
10. The cigarette lighter control circuit with a Lightning interface according to claim 9, characterized in that... The first MOS transistor and the second MOS transistor are N-channel MOS transistors.