Abstract
A highly efficient light-emitting-diode back-light power supply is proposed for liquid-crystal display. The proposed power supply consists of a bridgeless boost rectifier for power-factor correction and the asymmetrical half-bridge flyback converter with synchronous rectifier (SR) for DC-DC power conversion. In the proposed bridgeless boost rectifier, the diode reverse-recovery losses are reduced by achieving zero-current turn-off of the output diodes, as well as zero-current turn-on of the additional diodes. The reverse-recovery transients of the diodes are improved by a simple passive snubber circuit. For a DC-DC converter, the asymmetrical half-bridge flyback converter operates under zero-voltage switching for the power switches, and the SR switch operates under zero-current switching. The analysis of the proposed converter is presented and its design considerations are discussed in detail. Experimental results based on 28V, 300W back-light power are provided to demonstrate the performance of the proposed converter.
| Original language | English |
|---|---|
| Pages (from-to) | 133-142 |
| Number of pages | 10 |
| Journal | IET Electric Power Applications |
| Volume | 1 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2007 |
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