A PWM full-bridge converter with load independent soft-switching capability

Author

Moschopoulos, Gerry ; Jain, Praveen

Author_Institution

Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada

Volume

1

fYear

2000

fDate

6/22/1905 12:00:00 AM

Firstpage

79

Abstract

Although the zero-voltage switched (ZVS) pulsewidth modulated (PWM) full-bridge (FB) converter can operate with soft-switching and fixed frequency control it loses its ZVS capability under light-load conditions. This paper examines the use of auxiliary circuits attached to the bottom switches of the standard ZVS-PWM-FB converter as a means of extending the ZVS range. The auxiliary circuits, each consisting of an active switch and passive components, operate for only a small portion of the switching cycle, and handle very little power. The basic operating principles of these type of modified ZVS-PWM-FB converters are explained in detail in the paper, and general guidelines for their design are given. A design procedure is derived and demonstrated on an example converter. The feasibility of this converter is shown with results obtained from an experimental prototype

Keywords

PWM power convertors; bridge circuits; frequency control; switching circuits; PWM full-bridge converter; ZVS; active switch; auxiliary circuits; fixed frequency control; light-load conditions; load independent soft-switching capability; operating principles; passive components; pulsewidth modulation; switching cycle; zero-voltage switching; Capacitance; Circuit topology; Guidelines; Laboratories; Pulse width modulation; Pulse width modulation converters; Switches; Switching circuits; Switching converters; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 2000. APEC 2000. Fifteenth Annual IEEE

Conference_Location

New Orleans, LA

Print_ISBN

0-7803-5864-3

Type

conf

DOI

10.1109/APEC.2000.826087

Filename

826087