A new soft recovery PWM quasi-resonant converter with a folding snubber network

A new soft recovery (SR) quasi-resonant converter (QRC) having a multiple-order folding snubber network (MFSN) is introduced. It is obtained by combining a normal QRC with a folding snubber network of which the surrounding components are composed of passive devices only (diodes and capacitors). The reverse recovery loss of the main rectifier diode is eliminated by this method utilizing multiple resonance with a multiple-order folding snubber network. By realizing soft switching conditions, the proposed converter has pulsewidth modulation capability with high efficiency and is suitable for high-voltage and high-power DC to DC converter applications.

[1]  M.H. Kheraluwala,et al.  Modified valley fill high power factor electronic ballast for compact fluorescent lamps , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[2]  Chern-Lin Chen,et al.  Passive lossless snubbers for DC/DC converters , 1998 .

[3]  Ching-Jung Tseng,et al.  Passive lossless snubbers for DC/DC converters , 1998, APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition.

[4]  Kwang-Hwa Liu,et al.  Quasi-Resonant Converters-Topologies and Characteristics , 1987, IEEE Transactions on Power Electronics.

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

[6]  R.R. Verderber,et al.  Harmonics from compact fluorescent lamps , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.