A novel soft-switching full-bridge DC/DC converter: Analysis, design considerations, and experimental results at 1.5 kW, 100 kHz

Author

Redl, Richard ; Sokal, Nathan O. ; Balog, Laszlo

Author_Institution

Elfi SA, Switzerland

fYear

1990

fDate

0-0 1990

Firstpage

162

Lastpage

172

Abstract

The authors present an improved soft-switching full-bridge converter which is especially suitable for high-power application (e.g. more than 1 kW output) because of its inherently high efficiency. The addition of an external commutating inductor and two clamp diodes to the phase-shifted PWM (pulse width modulation) full-bridge DC-DC converter substantially reduced the switching losses of the transistors and the rectifier diodes, under all loading conditions. The authors analyze the conditions for lossless transitions, discuss the effect of the added components on the operation of the converter, and present practical considerations and test results for a 1.5 kW converter with 100 kHz clock frequency. The converter has an efficiency above 95% at 60 V output, is free from voltage overshoots, and exhibits well-controlled transitions for all switch and rectifier voltages and currents.<>

Keywords

bridge circuits; power convertors; switching; 1.5 kW; 100 kHz; 60 V; 95 percent; clamp diodes; clock frequency; design considerations; external commutating inductor; full-bridge DC/DC converter; high-power application; lossless transitions; phase-shifted PWM; pulse width modulation; rectifier diodes; soft-switching; switching losses; transistors; Clamps; DC-DC power converters; Diodes; Inductors; Pulse width modulation; Pulse width modulation converters; Rectifiers; Switches; Switching converters; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1990. PESC '90 Record., 21st Annual IEEE

Conference_Location

San Antonio, TX, USA

Type

conf

DOI

10.1109/PESC.1990.131185

Filename

131185