Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Multi-channel Current Balancing Single Switch LED Driver for LED Backlight
Authors Sang-Soo Hwang ; Sang-Kyoo Han
DOI 10.6113/TKPE/2016.21.4.320
Page pp.320-327
ISSN 1229-2214
Keywords Multi-channel LED driver; Current balancing
Abstract We propose a multi-channel current-balancing single switch light-emitting diode (LED) driver for a 3D TV. Conventional LED drivers require non-isolated DC/DC converters as many as the number of LED channels, whereas the proposed LED driver needs only one power switch and several balancing capacitors instead of expensive non-isolated DC/DC converters. Therefore, the proposed driver features a simple structure with low cost and high efficiency. In particular, because its power switch can be turned off under the zero-current switching condition, the proposed driver has desirable advantages, such as improved electromagnetic interference characteristics and high efficiency. Moreover, it only uses a small number of DC blocking capacitors with no additional active devices for the current balancing of multi-channel LEDs. Therefore, the proposed driver exhibits high reliability and cost effectiveness. To confirm the validity of the proposed driver, we perform a theoretical analysis and present design considerations and experimental results obtained from a prototype that is applicable to a 46” LED TV.