Driving circuit of vehicle headlamp

Abstract

A driving circuit of a vehicle headlamp comprises a low-beam light source driving circuit and an auxiliary light source driving circuit, wherein the low-beam light source driving circuit comprises an anti-interference module, a power supply driving chip U1, a boost-buck module and a low-beam LED module, wherein the anti-interference module comprises a common-mode coil the common-mode coil comprises an inductor LL1, a capacitor CC1 and a capacitor CC2, and thus, the interference nose of the driving circuit can be greatly reduced; with a DC-DC boost-buck driving mode, different power requirements of the low-beam LED module can be met; the auxiliary light source driving circuit comprises a buck driving chip, a buck module, a dimming module, an auxiliary light source LED module, a first input end and a second input end, the first input end is connected with a control end of a front lamp, and the second input end DRL is connected with a control end of a daytime running lamp; and the buck driving chip is used for controlling an output voltage according to voltage inputs of different input ends so as to achieve switching between the daytime running lamp and the front lamp.

Description

technical field [0001] The invention relates to a headlight, in particular to a vehicle headlight drive circuit. Background technique [0002] Existing vehicle headlights have more functions, not only have a low-beam light source, but may even integrate other auxiliary light sources, such as daytime running lights and front lights. Lights with different functions have different functions. For example, low beam lights are used to produce low beam light patterns, and their light patterns need to comply with corresponding regulations; It allows the driver to see the road clearly, but to let others know that a car is coming, so this lamp is not a lighting lamp, but a signal lamp; the front lamp is the same type as the daytime running lamp, but the brightness is lower than that of the daytime running lamp. is to recognize the contour of the vehicle. Since different lamps require different functions, their drivers will also be different. When multiple drivers are integrated toge...

AI Technical Summary

Problems solved by technology

Since different lamps require different functions, their drivers will also be different. When multiple drivers are integrated together, electromagnetic interference will easily occur, which will cause abnormalities in the driver of the LED module and affect the light output of the LED light source. Therefore, stability is required. better drive power

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