Switching power supply drive circuit of daytime running light and turn light

Abstract

The present invention relates to the field of automotive electronic technologies, especially to a switching power supply drive circuit of a daytime running light and a turn light. The drive circuit comprises a single chip microcomputer, a DC-DC power module, a first switching element, a second switching element, a daytime running light LED string and a turn light LED string; the single chip microcomputer, the DC-DC power module, the daytime running light LED string and the first switching element are connected in order to form a daytime running light control loop; and the single chip microcomputer, the DC-DC power module, the turn light LED string and the second switching element are connected in order to form a turn light control loop. The switching power supply drive circuit of a daytimerunning light and a turn light reduces the cost of a headlight, employs the single chip microcomputer to only need one set of power modules compared to two sets or more than two sets of power modulesneeded in the prior art, achieves drive of the daytime running light and the turn light at the same time and greatly reduces the development difficulty and the experimental expense.

Description

technical field [0001] The invention relates to the technical field of automotive electronics, in particular to a switching power supply drive circuit for daytime running lights and turn lights. Background technique [0002] With the popularization of automobiles, it has become a future trend for LED lights to gradually replace light bulbs. Daytime running lights make the vehicle easier to be recognized when driving in the daytime, and also make the car look cooler. In recent years, many countries have formulated relevant standards for daytime running lights, among which European daytime running lights have been compulsorily required to be installed. In order to truly ensure safety, the brightness and usage logic of the daytime running lights are defined. Since most daytime running lights have high brightness, when the daytime running lights are on, it will affect the observability of the turn signals, so the common The definition is that when the turn signal is on, the da...

AI Technical Summary

Problems solved by technology

The advantages of switching power supply include high efficiency, small size, high power, stable output voltage, etc., but there are also disadvantages such as poor anti-electromagnetic interference ability, high cost, and difficult development.

[0004] At present, daytime running lights and turn signals are usually driven by two sets of switching power supplies. The design of two or more sets

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