A ZVT quasi-resonant PWM converter for unity power factor application

In this paper, a new quasi-resonant PWM converter topology is proposed. This converter achieves zero-voltage transition (ZVT) conditions for both the main and auxiliary switching devices, and the blocking voltage of them has been clamped at a relatively low level during off period. The operating modes of the converter are analysed and described here. The proposed converter can be used for high frequency DC/DC conversion with a unity power factor. A laboratory prototype was built and experimental results were obtained for verification purposes.

[1]  I. Barbi,et al.  Sinusoidal line current rectification at unity power factor with boost quasi-resonant converters , 1990, Fifth Annual Proceedings on Applied Power Electronics Conference and Exposition.

[2]  T. Key,et al.  6 Switch-mode supply power factor improvement via harmonic elimination methods , 1991, [Proceedings] APEC '91: Sixth Annual Applied Power Electronics Conference and Exhibition.

[3]  D. Tollik,et al.  High efficiency telecom rectifier using a novel soft-switched boost-based input current shaper , 1991, [Proceedings] Thirteenth International Telecommunications Energy Conference - INTELEC 91.

[4]  Fred C. Lee,et al.  Novel zero-current-transition PWM converters , 1993 .

[5]  K. Hirachi,et al.  A quasi-resonant PWM converter with high quality input waveforms and high efficiency , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[6]  G. Joos,et al.  A single phase quasi-resonant rectifier with unity power factor , 1994, Proceedings of Intelec 94.

[7]  Fred C. Lee,et al.  Novel zero-voltage-transition PWM converters , 1992 .

[8]  Fred C. Lee,et al.  Characterization of an active clamp flyback topology for power factor correction applications , 1996 .