An improved soft-switching PWM FB DC/DC converter for reducing conduction losses

Author

Kim, Eun-Soo ; Joe, Kee-yeon ; Kye, Moon-Ho ; Kim, Yoon-Ho X. ; Yoon, Byung-Do

Author_Institution

Div. of Power Electron., Korea Electrotechnol. Res. Inst., Kyung Nam, South Korea

Volume

14

Issue

2

fYear

1999

fDate

3/1/1999 12:00:00 AM

Firstpage

258

Lastpage

264

Abstract

An improved soft-switching topology of a full-bridge (FB) pulsewidth-modulated (PWM) DC/DC converter is described. The new topology employs an energy-recovery snubber to minimize a circulating current flowing through the transformer and switching devices. By using an energy-recovery snubber instead of adding a tapped inductor and a saturable reactor to reduce RMS current stress, the converter achieves zero-current switching (ZCS) for the right leg due to the minimized circulating current and achieves zero-voltage switching (ZVS) for the left leg due to the reflected output current during the interval of left leg transition. Both analysis and experiments are performed to verify the proposed topology by implementing a 7 kW (120 VDC, 58 A) 30 kHz insulated gate bipolar transistor (IGBT) based experimental circuit

Keywords

DC-DC power convertors; PWM power convertors; bridge circuits; insulated gate bipolar transistors; losses; switching circuits; 120 V; 30 kHz; 58 A; 7 kW; IGBT; RMS current stress reduction; ZCS; ZVS; circulating current minimisation; conduction losses reduction; energy-recovery snubber; full-bridge converter; insulated gate bipolar transistor; left leg transition; reflected output current; saturable reactor; soft-switching PWM FB DC/DC converter; soft-switching topology; tapped inductor; zero-current switching; zero-voltage switching; DC-DC power converters; Inductors; Insulated gate bipolar transistors; Leg; Pulse width modulation; Pulse width modulation converters; Snubbers; Topology; Zero current switching; Zero voltage switching;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.750178

Filename

750178