Abstract
To improve the heat dissipation of high-power light-emitting diodes (LEDs), a cooling system with a fan is proposed. In the experiment, the LEDs array of 18 W composed of 6 LEDs of 3 W is used and the room temperature is 26oC. Results show that the temperature of the substrate of LEDs reaches 62oC without the fan, however, it reaches only 32oC when the best cooling condition appears. The temperature of the LEDs decreases by 30oC since the heat produced by LEDs is transferred rapidly by the fan. The experiment demonstrates that the cooling system with the fan has good performance.
Highlights
Light emitting diodes (LEDs), generally used for indicator lights, have been developed for the past 50 years
The results proved that the radiator designed can control the maximum junction temperature of light-emitting diodes (LEDs) chip within 70°C under the condition that all chips work in full-load and the environment temperature is 40°C
Several conditions at different input power of the fan are conducted to investigate its effect on thermal management of high power LEDs
Summary
Light emitting diodes (LEDs), generally used for indicator lights, have been developed for the past 50 years. Effective thermal management is the critical factor for the efficiency, reliability, and life of LEDs, especially for high power LEDs, thermal management has become the development bottleneck of LEDs [6,7,8]. Liu et al [12] introduced a method of thermal design and module of thermal resistance of High-power LED; and describes heat dissipation design for illumination Highpower LED arrays. Several conditions at different input power of the fan are conducted to investigate its effect on thermal management of high power LEDs. For achieving relatively exact temperature in LEDs, a K-type thermocouple is welded into the substrate of LEDs, and its signal is collected by using data acquisition system. Based on the detected temprature, the cooling ability of the system is evaluated
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