Single-Stage Single-Switch PFC Flyback Converter Using a Synchronous Rectifier
Jong-Jae Lee
Jung-Min Kwon
Eung-Ho Kim
Woo-Young Choi
Bong-Hwan Kwon
Samsung Electron. Co., Ltd., Asan;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: March 2008
Volume: 55,
Issue: 3
On page(s): 1352-1365
ISSN: 0278-0046
INSPEC Accession Number: 9897246
Digital Object Identifier: 10.1109/TIE.2007.911908
Current Version Published: 2008-03-03
Abstract
A single-stage single-switch power factor correction (PFC) flyback converter with a synchronous rectifier (SR) is proposed for improving power factor and efficiency. Using a variable switching-frequency controller, this converter is continuously operated with a reduced turn-on switching loss at the boundary of the continuous conduction mode and discontinuous conduction mode (DCM). The proposed PFC circuit provides relatively low dc-link voltage in the universal line voltage, and also complies with Standard IEC 61000-3-2 Class D limits. In addition, a new driving circuit as the voltage driven-synchronous rectifier is proposed to achieve high efficiency. In particular, since a driving signal is generated according to the voltage polarity, the SR driving circuit can easily be used in DCM applications. The proposed PFC circuit and SR driving circuit in the flyback converter with the reduced switching loss are analyzed in detail and optimized for high performance. Experimental results for a 19 V/90 W adapter at the variable switching-frequency of 30~70 kHz were obtained to show the performance of the proposed converter.
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