Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Floating Voltage Stacked LED Driver for Low Voltage Stress and Multi-channel Current Balancing
Authors Won-Sun Hwang ; Sang-Soo Hwang ; Jeong-Il Kang ; Sang-Kyoo Han
DOI 10.6113/TKPE/2015.20.2.122
Page pp.122-129
ISSN 1229-2214
Keywords Multi-channel LED driver; Current balancing
Abstract In this study, we propose a low voltage stress and cost-effective light emitting diode (LED) driver capable of multi-channel current balancing. Conventional LED drivers require as many boost converters as the number of LED channels, whereas the proposed LED driver requires only one buck converter and several balancing capacitors instead of several expensive boost converters. Additionally, while the components of the boost converter have high voltage stress and depend on the LED driving voltage, components of the proposed driver have about one-half of the voltage stress across all components. The proposed driver exhibits high reliability and cost effectiveness because it only uses few DC blocking capacitors with no additional active devices to balance the current of multi-channel LEDs. The proposed driver exhibits high reliability and cost effectiveness. The validity of the proposed driver is confirmed through a theoretical analysis. An explanation of the design considerations and experimental results were obtained using a prototype applicable to a 46” LED-TV.