A Highly Power-Efficient LED Back-Light Power Supply for LCD Display

作者：Choi Woo Young^*

来源：Journal of Display Technology, 2013, 9(5): 382-387.

DOI：10.1109/JDT.2013.2248120

• Back-light power supply
• dc-dc converter
• light-emitting diode (LED)
• liquid crystal display (LCD)
• power factor correction (PFC)

This paper proposes a highly power-efficient light-emitting diode (LED) back-light power supply for liquid crystal display (LCD). The proposed converter integrates the power factor correction (PFC) circuit with the dc-dc converter. It provides an isolated dc voltage without using any full-bridge diode rectifier. Conduction losses are reduced by eliminating the full-bridge diode rectifier. Switching power losses are also reduced by achieving zero-voltage switching (ZVS) operation of power switches. By reducing power losses, the power efficiency of the LED back-light power supply can be improved. The experimental results are presented to verify the feasibility of the proposed converter for a 100 W LED back-light power.

• 出版日期2013-5