Automotive LED indicator light drive circuit and device

The automotive LED indicator driver circuit addresses power supply isolation issues in vehicle lighting control circuits by using three independent step-down modules to power different modules separately, improving stability and reliability.

TWM685224UActive Publication Date: 2026-07-11SHENZHEN SHENHANG HUACHUANG AUTOMOBILE TECHNOLOGY CO LTD
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Patent Information

Application Number
TW115202360
Authority / Receiving Office
TW · TW
Patent Type
Utility models
Current Assignee / Owner
Filing Date
2026-03-18
Publication Date
2026-07-11
Estimated Expiration
2036-03-17

AI Technical Summary

Technical Problem

Existing vehicle lighting control circuits lack effective hardware power supply isolation between modules, leading to noise interference, electromagnetic interference, and voltage ripple issues that affect the operational stability and reliability of the MCU and communication modules.

Method used

An automotive LED indicator driver circuit with three independent step-down modules powers different functional modules separately, ensuring hardware power supply isolation and preventing interference between the main control module, CAN decoding module, and LED indicator.

Benefits of technology

The solution improves the stability and reliability of the circuit operation by preventing power supply interference and maintaining accurate voltage levels across different modules, enhancing the overall performance of the vehicle lighting control system.

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Abstract

This invention relates to an automotive LED indicator light driving circuit and device. The driving circuit includes a main control module, a CAN decoding module, an interface module, a power supply module, and an LED light driving module. The power supply module includes three independent step-down modules: a first step-down module, a second step-down module, and a third step-down module. All three modules are connected to the interface module to obtain the power supply voltage from the vehicle's power supply. The first step-down module is connected to the CAN decoding module to convert the power supply voltage into a first operating voltage for the CAN decoding module. The second step-down module is connected to the main control module to convert the power supply voltage into a second operating voltage for the main control module. The third step-down module is connected to the LED indicator light to convert the power supply voltage into a third operating voltage for the LED indicator light. Through this method, this application enables effective hardware power supply isolation between the main control module, the CAN decoding module, and the LED indicator light.
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