Zero-voltage-switched quasi-resonant buck and flyback converters-experimental results at 10 MHz

Author

Tabisz, Wojciech A. ; Gradzki, Pawel M. ; Lee, Fred C Y

Author_Institution

Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

Volume

4

Issue

2

fYear

1989

fDate

4/1/1989 12:00:00 AM

Firstpage

194

Lastpage

204

Abstract

Experimental results are presented for buck and flyback zero-voltage-switched (ZVS) quasi-resonant converters (QRCs) operating above 5 MHz. A design procedure for a buck ZVS QRC is proposed that minimizes voltage stress to the power MOSFET transistor while maintaining zero voltage switching for specified ranges of input voltage and load resistance. A quasi-resonant gate drive scheme is also proposed and implemented in a buck converter. The drive is simple and provides high switching speed. Power dissipation in the gate drive is substantially reduced due to the quasi-resonant operation. The ZVS QRC technique described is suitable for very-high-frequency operation due to its ability to reduce dynamic turn-on losses, Miller effect, dv/dt, and di//dt and can be applied in distributed onboard power supplies

Keywords

losses; power convertors; 5 to 10 MHz; Miller effect; ZVS QRC; buck convertors; distributed onboard power supplies; dynamic turn-on losses; flyback converters; power MOSFET transistor; voltage stress; zero voltage switching; zero-voltage switched quasi-resonant convertors; Capacitance; Capacitors; DC-DC power converters; MOSFET circuits; Resonance; Switches; Switching circuits; Switching converters; Switching loss; Zero voltage switching;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.24904

Filename

24904