Heat radiating device of white light LED of automobile head light

Abstract

The invention relates to a radiating device for a vehicle headlight, namely a white LED, belonging to the technical field of vehicle illumination. The radiating device comprises the white LED, a heat pipe, a condensation base and an evaporation base, wherein the evaporation base is provided with an evaporation substrate and a first radiating fin integrated into a whole with the evaporation substrate; the condensation base comprises a condensation substrate and a second radiating fin integrated into a whole with the condensation base; the surface area of the condensation substrate is four to six times of that of the evaporation substrate; a heat pipe evaporation section and a heat pipe condensation section on two sides of the heat pipe are fixedly connected into the evaporation substrate and the condensation substrate respectively; and the white LED is glued on the evaporation substrate through heat-conducting glue. The radiating device changes the prior structure, can swiftly transmit the heat generated by the white LED, avoid the defect of uneven heat distribution of fins which can not be avoided by pure metal fins, not only guarantee enough radiating area, but also have high fin efficiency, thereby effectively controlling junction temperature of the white LED, and making the white LED illuminate normally and stably.

Description

technical field [0001] The invention relates to a heat dissipation device for a white light LED of a vehicle headlight, belonging to the technical field of vehicle lighting. Background technique [0002] The light source of headlights for motor vehicles adopts traditional tungsten filament bulbs or halogen bulbs. In order to meet the requirements of use, 16-21W bulbs are usually used to reflect the light source to the front through the reflector. This kind of light source has defects such as short service life, low brightness, large power consumption, long excitation response time, and poor driving safety. The other is to use advanced white LED as the light source, which has the advantages of high light source utilization rate, long service life, short excitation response time, good driving safety, and is conducive to vehicle appearance design. However, under the current luminous efficiency, high-power white LEDs can only convert a small part of the input power into light e...

AI Technical Summary

Problems solved by technology

In this method, since the size of the heat dissipation surface of the LED is much smaller than the surface size of the heat sink attached to it, the central fin with a short heat conduction path bears the main heat dissipation effect, while the fins on the side of the heat sink have a smaller role. Increase the heat dissipation area in the middle area, and the use of heightened fins for heat dissipation will reduce the heat transfer efficiency of the fins, which not only increases the size and weight of the heat sink, but also weakens the enhanced heat transfer effect

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