| DESIGN OF AUTOMOTIVE HEADLAMP WITH HIGH-POWER LEDS |
| J. WANG, Y. X. CAI, X. H. LI, X. J. ZHAO, C. ZHANG |
| Jiangsu University |
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| ABSTRACT |
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A novel vehicle headlamp low beam system is presented. The optical system is composed of three identical cells to ensure enough illumination. A poly-ellipsoid reflector and a aspherical lens are used to concentrate the rays and a baffle is employed to produce the cut-off line. The optical performance shows a good agreement with the requirement for headlamp in Chinese national standard. The smart constant current driver sustains automotive headlamps' requirements, moreover it has high power efficiency. The performance of three kinds of cooling systems with different structures are simulated and evaluated by FloTHERM software. Then a loop heat pipes combined with fins cooling system is manufactured for cooling the designed LED headlamp. It can greatly improve the cooling efficiency. Even in the 80oC environmental temperature, it can meet the working requirements of LED headlamp low beam system, so it is a kind of feasible cooling scheme. |
| Key Words:
LED headlamp, Optical design, Junction temperature, LED driver, Heat pipe |
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