An Innovative Transom Type Venturi Cooling Design for High-Power LED Headlamp

摘要

High power LED headlamp has the advantage of environmental protection and long-term usage and usually adopted as illuminating system in automobiles and motorcycles. But the problem of using high power LED is the heating issue which always costs a lot on heat dissipation design and thus limits its popularity. How to improve the heat performance and reach a feasible design with reasonable cost of high power LED is our purpose. This project proposes an innovative window type Venturi cooling system to help reduce the high power LED emitting heat on working. It uses lamp-shape heat sink base that is coated by aluminum nitride (AlN) ceramics to be an insulation layer which can reduce the damage of emanating heat and promote the working hours of high power LED. In the experiment a heat sink base is mounted on the lamp base and a set of fin type aluminum contained in the Venturi to help dissipate heat is connected with the lamp. A convection window stands in the Venturi system to help the aluminum cool down. It is obviously seen that the force convection contributes a lot on heat dissipation when vehicles running. The record shows that the highest temperature comes to 96.4 °C ‘ 93.3 °C and 89.8 °C on the high power LED headlamps of 85W, 80W and 100W separately without the convection window design. The other record shows that the temperature comes to 74.6 °C ‘ 73.7 °C and 64.8°C on the same lamps but with cooling down window embedded. The effective cooling down temperature is 21.6 °C, 19.8°C and 25°C. The heat dissipation performance contributes 22.61% ‘ 21% and 27.83%. By the analysis of finite elements on window type Venturi system shows that experiments data coincides with theory assumption. This project absolutely shows that an innovative window type Venturi cooling system is highly effective on heat dissipation and can provide more competitive high power LED products in the market.