Efficient LED back-light power supply for liquid-crystal-display
SCIE
SCOPUS
- Title
- Efficient LED back-light power supply for liquid-crystal-display
- Authors
- Choi, WY; Kwon, JM; Kwon, BH
- Date Issued
- 2007-03
- Publisher
- INSTITUTION ENGINEERING TECHNOLOGY-IE
- 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 28 V, 300 W back-light power are provided to demonstrate the performance of the proposed converter.
- Keywords
- CONDUCTION LOSSES; RECTIFIER; CONVERTER
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23439
- DOI
- 10.1049/iet-epa:20060222
- ISSN
- 1751-8660
- Article Type
- Article
- Citation
- IET ELECTRIC POWER APPLICATIONS, vol. 1, no. 2, page. 133 - 142, 2007-03
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