Abstract
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.
© 2013 IEEE
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