Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Nonisolated Multichannel LED Current Balancing Scheme Using Coupled Inductor and Series Resonant Converter
Authors Yooyong Shin ; Daheon Hong ; Byungcho Choi ; Honnyong Cha
DOI 10.6113/TKPE.2021.26.4.249
Page pp.249-255
ISSN 1229-2214
Keywords Charge balance condition; Coupled inductor; LED current balancing; Series resonant converter; Zero-voltage switching
Abstract A novel current balancing technique for multichannel light-emitting diode (LED) that uses a series resonance and coupled inductor is proposed in this paper. The proposed LED driver balances output currents through frequency control and enables zero-voltage switching. The proposed converter utilizes the charge balance condition of the resonant capacitor and the current sharing function of the coupled inductor to achieve whole LED current balancing without an additional controller. The proposed coupled inductor can integrate the current balancing function and the resonant inductor, so the power density can be increased by reducing the number of magnetic devices. A 40 W prototype is built to verify the validity of this LED driver, and the experimental results are successfully obtained.