一种车载化妆镜用防误触控制电路

Abstract

本实用新型公开了一种车载化妆镜用防误触控制电路，属于车载电子技术领域，包括触控独立电路板和驱动独立电路板；所述触控独立电路板上设置有主控芯片、触控感应器、调试接口及第一线排，所述触控感应器的信号输出端与所述主控芯片的信号输入端电连接，所述调试接口与所述主控芯片的调试引脚电连接，所述第一线排用于所述触控独立电路板的外部扩展连接。本实用新型通过分离触控与驱动电路板减少电磁干扰；霍尔开关与触控时长双重判断避免误触；集成亮度、色温调节提升实用性；电源管理模块保障电路安全。整体解决了现有车载化妆镜控制器易误触、功能单一的问题，具有显著的实用性和创新性。

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 mistaken touch prevention control circuit for a vehicle-mounted cosmetic mirror according to claim 1, characterized by, 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 mistaken touch prevention control circuit for a vehicle-mounted cosmetic mirror according to claim 2, characterized by 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 mistaken touch prevention control circuit for a vehicle-mounted cosmetic mirror according to claim 3, characterized by 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 mistaken touch prevention control circuit for a vehicle-mounted cosmetic mirror according to claim 4, characterized by 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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