High-voltage Linear LED for Three-phase AC Power Applications

Abstract

This paper investigates high-voltage light emitting diodes (LEDs) driven linearly by three-phase AC power, which features high reliability, cost effectiveness, all-solid-state components, and a minimum number of driving elements. To verify the optical and electrical properties of high-voltage LED, a high-voltage LED lighting system driven linearly by three-phase AC power was built as a prototype in this paper. At the rated voltage of 380V, the LED lighting system has input power of 145W, total luminance flux of 18500lm, luminous efficacy of 127lm/W, correlated color temperature (CCT) of 5617K, and color rendering index (Ra) of 70.6, power factor (PF) of 0.95. Further, the experimental results show that stable output luminance, high luminous efficacy, high PF, and flicker-free are achieved within 380V±10% voltage fluctuation.