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

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1 Author(s)
Woo-Young Choi ; Div. of Electron. Eng., Chonbuk Nat. Univ., Jeon-ju, South Korea

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.

Published in:

Display Technology, Journal of  (Volume:9 ,  Issue: 5 )