Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title 4-Channel LED Current Balancing Scheme Using C-Fed Hybrid Quasi-Z-Source Converter
Authors Daheon Hong ; Honnyong Cha
DOI 10.6113/TKPE.2021.26.1.66
Page pp.66-73
ISSN 1229-2214
Keywords Charge balance condition; Current-fed; Hybrid Z-source converter; LED current balancing; Quasi-Z-source network
Abstract This study presents a novel four-channel light-emitting diode (LED) current balancing topology using a current-fed hybrid quasi-Z-source converter. With the proposed structure, currents flowing through four LED strings are automatically balanced owing to the charge (amp-sec) balance condition on capacitors. Thus, automatic current balancing of the proposed driver is simple and precise. In addition, the proposed LED driver uses only one active switch and three diodes. The operating principle and characteristics of the proposed four-channel LED driver are analyzed in detail. To verify the operation of the proposed LED driver, a prototype is built and tested with different numbers of LEDs.