고출력 LED 탐조등의 설계에 관한 연구

Abstract

This thesis dealt with the design of a high power LED searchlight to replace a conventional searchlight with 1kW halogen lamps. The design specification follows KDS 6230-1046-1 and KS V 8469. An LED package and a lens with the beam angle of 6˚ were used to meet the center luminous intensity of 800,000cd specified in KS V standard.

Heat sink was selected by a simulation because the optical power and the life span of LED changes depending on the heat amount. The heat dissipation of a prototype LED searchlight improved the durability as it is made with air cooling type using natural convection instead of using the fan or heat-pipe.

As a result of the test, the power consumption of a prototype LED searchlight (150W) was saved by 85% compared to the halogen lamp searchlight (1kW). The center luminous intensity was 945,000cd, satisfying KS V 8469 and the luminous efficacy was improved by 4.7 times compared to that of conventional searchlights.

Also, the beam angle, the color temperature, and the color rendering were measured 5.4°, 5,500K, and 70, respectively. The surface temperature of a prototype LED searchlight (below 60℃) and the surrounding temperature of the SMPS (below 50℃) satisfied KS C IEC 60092-306.