Two-switch flyback transformer soft switching PWM DC-DC converter with passively energy regeneration lossless snubbers

In this paper, a two-switch high frequency flyback type zero voltage soft switching PWM DC-DC converter using IGBTs is proposed. This power converter is basically composed of two active power switches and a flyback high frequency transformer. In addition to these, two passive lossless snubbers with power regeneration loops for energy recovery, consisting of a three winding auxiliary high frequency transformer, auxiliary capacitors and diodes are introduced to achieve zero voltage soft switching from light to full load conditions. Furthermore, this power converter has some advantages such as low cost circuit configuration, simple control scheme and high efficiency. Its operating principle is described and to determine circuit parameters, some practical design considerations are discussed. The effectiveness of the proposed power converter is evaluated and compared with the hard switching PWM DC-DC converter from an experimental point of view.

[1]  G. Venkataramanan,et al.  A critical evaluation of high power hard and soft switched isolated DC-DC converters , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[2]  Yoon-Ho Kim,et al.  An improved soft switching PWM FB DC/DC converter for reducing conduction losses , 1996 .

[3]  D. V. Ghodke,et al.  1.5 kW two switch forward ZCZVS converter using primary side clamping , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[4]  Fred C. Lee,et al.  Utilization of an active-clamp circuit to achieve soft switching in flyback converters , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[5]  Mutsuo Nakaoka,et al.  Transformer parasitic reactive components-assisted soft-switching PWM inverter type DC-DC converter with ZCS power switches , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[6]  M. Nakaoka,et al.  A novel zero-voltage and zero-current switching PWM DC-DC converter with reduced conduction losses , 2002 .