Universal input single-stage PFC AC/DC converter with reduced DC-bus voltage stress

High DC bus voltage stress and low conversion efficiency limit the practical application for single stage power factor correction (PFC) AC-DC converters. This paper presents a cost-effective approach to alleviate these issues based on a conventional BIFRED AC/DC converter. In the proposed topology, a flyback transformer and a small serial connected inductor are implemented to replace the traditional input PFC inductor, and a cost-efficient lossless snubber is also proposed to reduce the turn-off spike of the main switch. The experimental results of a 20 V@4.5 A prototype indicate that the proposed technique can suppress the DC voltage below 400 V through the entire universal input range, while keeping the efficiency and power factor above 81% and 0.95 respectively.

[1]  Fred C. Lee,et al.  Single-stage single-switch power-factor-correction AC/DC converters with DC-bus voltage feedback for universal line applications , 1998 .

[2]  F. Lee,et al.  An improved CCM single-stage PFC converter with a low frequency auxiliary switch , 2003 .

[3]  L. Brush,et al.  The hottest markets for external power supplies now and a look at potential future markets , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).

[4]  R. Redl,et al.  A new family of single-stage isolated power-factor correctors with fast regulation of the output voltage , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[5]  Fu-Sheng Tsai,et al.  Off-line flyback converter with input harmonic current correction , 1996, Proceedings of Intelec'96 - International Telecommunications Energy Conference.

[6]  M. Chow,et al.  Single-stage single-switch isolated PFC regulator with unity power factor, fast transient response and low voltage stress , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[7]  Toshiharu Ninomiya,et al.  Novel soft-switched single-stage AC-DC converter with low line-current harmonics and low output-voltage ripple , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[8]  Fred C. Lee,et al.  An improved CCM single-stage PFC converter with a low-frequency auxiliary switch , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[9]  E. Rodriguez,et al.  A novel isolated high quality rectifier with fast dynamic output response , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.