A single-stage power-factor-corrected AC/DC converter

This paper presents a single-stage isolated converter topology designed to achieve a regulated DC output voltage having no low-frequency components and a high-input power factor. The topology is derived from the basic two-switch forward converter, but incorporates an additional transformer winding, inductor and a few diodes. The proposed circuit inherently forces the input current to be discontinuous and AC modulated to achieve high-input power factor. The converter output is operated in discontinuous mode to minimize the bulk capacitor voltage variations when the output load is varied. Analysis of the converter is presented, and performance characteristics are given. Design guidelines to select critical components of the circuit are presented. Experimental results on a 150 W 50 kHz universal input (90-265 V) 54.75 V output AC/DC converter are given which confirm the predicted performance of the proposed topology.

[1]  Milan M. Jovanovic,et al.  Reduction of voltage stress in integrated high-quality rectifier-regulators by variable-frequency control , 1994, Proceedings of 1994 IEEE Applied Power Electronics Conference and Exposition - ASPEC'94.

[2]  R. Redl,et al.  Design considerations for single-stage isolated power-factor-corrected power supplies with fast regulation of the output voltage , 1995, Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95.

[3]  M. J. Willers,et al.  A BIFRED converter with a wide load range , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[4]  G. Joos,et al.  A single stage power factor corrected AC/DC converter , 1996, Proceedings of Intelec'96 - International Telecommunications Energy Conference.

[5]  K. Kit Sum.  Switch Mode Power Conversion: Basic Theory and Design , 1984 .

[6]  G. Joos,et al.  A single stage single switch power factor corrected AC/DC converter , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.

[7]  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.

[8]  Deepak Divan,et al.  A unity power factor forward converter , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[9]  M. H. Kheraluwala,et al.  A fast-response high power factor converter with a single power stage , 1991, PESC '91 Record 22nd Annual IEEE Power Electronics Specialists Conference.

[10]  K.-H. Liu,et al.  Current waveform distortion in power factor correction circuits employing discontinuous-mode boost converters , 1989, 20th Annual IEEE Power Electronics Specialists Conference.

[11]  R. Redl.  An economical single-phase passive power-factor-corrected rectifier: topology, operation, extensions, and design for compliance , 1998, APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition.