Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title A High Efficiency LED Driver Circuit using LLC Resonant Converter
Authors Dae-Seong Shin ; Young-Jin Jung ; Sung-Soo Hong ; Sang-Kyu Han ; Byung-Jun Jang ; Jong-Hae Kim ; 李Il-Oun Lee ; 盧Chung-Wook Roh
DOI 10.6113/TKPE/2010.15.1.35
Page pp.35-42
ISSN 1229-2214
Keywords LED Driver; High efficiency; LLC converter; PWM Dimming
Abstract This paper presents the Two-stage LED Driving system using LLC resonant converter for LED lighting application. Due to the existence of the nonisolation DC/DC converter to control the LED current and the light intensity, the conventional three-stage LED Driving system has the problem of low power conversion efficiency. To solve this problem, a novel scheme without any nonisolation DC/DC converter is proposed, in which, the isolated DC/DC converter, e.g., LLC resonant converter in the paper, can perform the LED current control and stage, e.g., PFC stage and LLC stage, the efficiency can be significantly improved. Moreover, the cost and the volume of the whole LED driving system can be reduced compared to those of the conventional ones. The operational principle and the characteristics of the proposed scheme are presented. The proposed scheme is verified experimentally with a 45W output prototype LED driver.