Mistaken touch prevention control circuit for vehicle-mounted cosmetic mirror

Abstract

The invention discloses a mistaken touch prevention control circuit for a vehicle-mounted cosmetic mirror, which belongs to the technical field of vehicle-mounted electronics and comprises a touch control independent circuit board and a driving independent circuit board. A main control chip, a touch sensor, a debugging interface and a first wire row are arranged on the touch independent circuit board, the signal output end of the touch sensor is electrically connected with the signal input end of the main control chip, and the debugging interface is electrically connected with a debugging pin of the main control chip; the first wire row is used for external expansion connection of the touch independent circuit board. The electromagnetic interference is reduced by separating the touch control circuit board from the driving circuit board; mistaken touch is avoided through double judgment of the Hall switch and the touch duration; brightness and color temperature adjustment are integrated to improve practicability; the power management module guarantees circuit safety. The vehicle-mounted cosmetic mirror controller integrally solves the problems that an existing vehicle-mounted cosmetic mirror controller is prone to being touched by mistake and single in function, and has remarkable practicability and innovativeness.

Description

Technical Field

[0001] This invention relates to the field of automotive electronics technology, specifically to an anti-accidental touch control circuit for automotive vanity mirrors. Background Technology

[0002] Existing car vanity mirrors mostly use touch-integrated circuits for their fill light controls. The touch control and driving functions share a single circuit board, making them susceptible to electromagnetic interference and vibration in the vehicle environment, leading to accidental triggering of the fill light. Furthermore, most control circuits only provide on / off functionality, unable to adjust brightness and color temperature, failing to meet the needs of different users. Therefore, a control circuit with strong anti-interference capabilities, good anti-accidental touch performance, and comprehensive functions is needed. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-accidental touch control circuit for a car vanity mirror, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An anti-accidental touch control circuit for a car vanity mirror includes a separate touch circuit board and a separate drive circuit board.

[0006] The independent touch circuit board is provided with a main control chip, a touch sensor, a debugging interface and a first busbar. The signal output terminal of the touch sensor is electrically connected to the signal input terminal of the main control chip, the debugging interface is electrically connected to the debugging pin of the main control chip, and the first busbar is used for external expansion connection of the independent touch circuit board.

[0007] The independent drive circuit board is equipped with a voltage conversion module, an LED driver module, a Hall switch module, a shunt circuit, a power management module, and a second busbar. The LED driver module includes a color temperature adjustment circuit and a brightness adjustment circuit. The input terminal of the power management module is used to connect to the vehicle's 12V power supply. The input terminal of the power management module is electrically connected to the input terminal of the shunt circuit. The shunt circuit is connected to the Hall sensor switch and the LED lamp group respectively. The Hall sensor switch is also connected to the voltage conversion module. The output terminal of the power management module is connected to the second busbar.

[0008] The control signal output terminal of the main control chip is electrically connected to the control input terminal of the color temperature adjustment circuit and the control input terminal of the brightness adjustment circuit through the first busbar and the second busbar, respectively.

[0009] The control output terminal of the color temperature adjustment circuit and the output terminal of the brightness adjustment circuit are connected to the LED light group.

[0010] As a further aspect of the present invention: the touch sensor is a capacitive touch sensor, and there are two of them, which are symmetrically arranged on both sides of the edge of the car vanity mirror; the sensing distance of the touch sensor is 3-15mm, and it has a built-in anti-shake filter unit. The filtering frequency of the anti-shake filter unit is 10-20Hz, which is used to filter interference signals generated by vehicle vibration.

[0011] As a further embodiment of the present invention: the Hall switch module includes a Hall sensor U1, a magnet and peripheral circuitry, the magnet being fixed to the inside of the cover of the vehicle cosmetic mirror, and the Hall sensor U1 being fixed at a position corresponding to the position of the magnet.

[0012] As a further aspect of the present invention: the peripheral circuit includes a resistor R1 and a capacitor C1. The power supply terminal of the Hall sensor U1 is connected to a 5V power supply through the resistor R1, the output terminal is grounded through the capacitor C1, and the output terminal is electrically connected to the main control chip.

[0013] As a further aspect of the present invention: when the lens cover is closed, the Hall sensor U1 outputs a low-level signal; when the lens cover is open, it outputs a high-level signal, and the main control chip only responds to the input signal of the touch sensor when it receives a high-level signal.

[0014] Compared with existing technologies, the advantages of this invention are: it reduces electromagnetic interference by separating the touch control and driving circuit boards; it avoids accidental touches through dual judgment of Hall switch and touch duration; it enhances practicality by integrating brightness and color temperature adjustment; and it ensures circuit safety through a power management module. Overall, it solves the problems of easy accidental touches and limited functionality in existing in-vehicle vanity mirror controllers, demonstrating significant practicality and innovation. Attached Figure Description

[0015] Figure 1 This is a block diagram of the system of the present invention;

[0016] Figure 2 This is a schematic diagram of the controller structure of the present invention;

[0017] Figure 3 The circuit schematic of the main control chip;

[0018] Figure 4 This is the schematic diagram of the first busbar circuit;

[0019] Figure 5 This is the circuit schematic of the voltage conversion module;

[0020] Figure 6 Here is the circuit schematic of the Hall switch module;

[0021] Figure 7 This is the circuit schematic of the LED driver module.

[0022] Figure 2 In the middle: 1-LED light, 2-control circuit board, 3-makeup mirror. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely one circuit embodiment of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: Please refer to Figure 1-7 An anti-accidental touch control circuit for a car vanity mirror reduces interference by separating the touch control and drive circuit boards, combines Hall switches with touch signal duration judgment to achieve anti-accidental touch, and integrates brightness and color temperature adjustment functions.

[0025] The circuit includes a separate touch control circuit board and a separate driver circuit board: the touch control circuit board is responsible for signal acquisition and processing, and the driver circuit board is responsible for power supply and fill light control. The two are connected by a first busbar and a second busbar to improve anti-interference. The Hall switch module detects the state of the lens cover and only responds to touch when the lens cover is open to avoid accidental touches. The main control chip controls the fill light by comprehensively judging the stability of the touch signal, and also supports brightness and color temperature adjustment.

[0026] The independent touch circuit board houses the main control chip, two capacitive touch sensors, a debugging interface, and a first busbar. The two touch sensors are symmetrically mounted on both sides of the cosmetic mirror's surface, with their outputs connected to the first signal input of the main control chip for transmitting touch signals. The Hall sensor of the Hall switch module is fixed to the touchpad, corresponding to the magnet inside the mirror cover. Its output is connected to the second signal input of the main control chip, outputting a high level when the mirror cover is open and a low level when it is closed.

[0027] The independent driver circuit board includes a voltage conversion module, an LED driver module, a Hall switch module, a color temperature adjustment circuit, a brightness adjustment circuit, a shunt circuit, a power management module, and a first busbar. The reverse polarity protection diode D2 of the power management module is connected in series to the 12V vehicle power input, and its output is connected to the shunt circuit. The shunt circuit splits the 12V power supply into two paths: one input to the voltage conversion module, and the other input to the LED driver module.

[0028] The main control chip has a built-in signal processing unit. When it receives a high level from the Hall switch (the lens cover is open) and there are no three consecutive jitters, it outputs a control signal to control the fill light to turn on and adjust the color temperature and brightness; otherwise, it remains off to prevent accidental touches.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A control circuit for preventing accidental touches in a car vanity mirror, characterized in that, Includes a separate touch control circuit board and a separate driver circuit board; The independent touch circuit board is provided with a main control chip, a touch sensor, a debugging interface and a first busbar. The signal output terminal of the touch sensor is electrically connected to the signal input terminal of the main control chip, the debugging interface is electrically connected to the debugging pin of the main control chip, and the first busbar is used for external expansion connection of the independent touch circuit board. The independent drive circuit board is equipped with a voltage conversion module, an LED driver module, a Hall switch module, a shunt circuit, a power management module, and a second busbar. The LED driver module includes a color temperature adjustment circuit and a brightness adjustment circuit. The input terminal of the power management module is used to connect to the vehicle's 12V power supply. The input terminal of the power management module is electrically connected to the input terminal of the shunt circuit. The shunt circuit is connected to the Hall sensor switch and the LED lamp group respectively. The Hall sensor switch is also connected to the voltage conversion module. The output terminal of the power management module is connected to the second busbar. The control signal output terminal of the main control chip is electrically connected to the control input terminal of the color temperature adjustment circuit and the control input terminal of the brightness adjustment circuit through the first busbar and the second busbar, respectively. The control output terminal of the color temperature adjustment circuit and the output terminal of the brightness adjustment circuit are connected to the LED light group.

2. The anti-accidental touch control circuit for a car vanity mirror according to claim 1, characterized in that, The touch sensor is a capacitive touch sensor, and there are two of them, which are symmetrically arranged on both sides of the edge of the car vanity mirror. The sensing distance of the touch sensor is 3-15mm, and it has a built-in anti-shake filter unit with a filtering frequency of 10-20Hz, which is used to filter interference signals generated by vehicle vibration.

3. The anti-accidental touch control circuit for a car vanity mirror according to claim 2, characterized in that, The Hall switch module includes a Hall sensor U1, a magnet, and peripheral circuitry. The magnet is fixed to the inside of the cover of the vehicle-mounted vanity mirror, and the Hall sensor U1 is fixed at a position corresponding to the position of the magnet.

4. The anti-accidental touch control circuit for a car vanity mirror according to claim 3, characterized in that, The peripheral circuit includes a resistor R1 and a capacitor C1. The power supply terminal of the Hall sensor U1 is connected to a 5V power supply through the resistor R1, and the output terminal is grounded through the capacitor C1. The output terminal is also electrically connected to the main control chip.

5. The anti-accidental touch control circuit for a car vanity mirror according to claim 4, characterized in that, When the lens cover is closed, the Hall sensor U1 outputs a low-level signal; when the lens cover is open, it outputs a high-level signal. The main control chip only responds to the input signal of the touch sensor when it receives a high-level signal.

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