A self core reset and zero voltage switching forward converter topology

Author

Xi, Youhao ; Jain, Praveen K. ; Liu, Yan F. ; Orr, Ray

Author_Institution

EMS Technol. Canada Ltd., Montreal, Que., Canada

Volume

15

Issue

6

fYear

2000

fDate

11/1/2000 12:00:00 AM

Firstpage

1192

Lastpage

1203

Abstract

A self core reset and zero voltage switching (ZVS) forward converter topology is presented in this paper. By employing a simple auxiliary circuit, the proposed topology is able to achieve self reset of the power transformer without the use of the conventional tertiary reset winding, and its main switch can be turned on and turned off under ZVS independent of line and load conditions. This simplifies the power transformer, and the switching losses are substantially removed to improve the overall efficiency. Steady state analysis of the circuit is performed. Based on the analysis, a design procedure is presented, and the effects of the circuit parameters on the flux excursion of the power transformer are investigated to make sure self reset can be achieved without increasing the core losses. Simulation and experiment on a 5 V, 100 W prototype circuit operated at 200 kHz are carried out to verify the design, about 5% higher overall efficiency is obtained in the prototype converter than in its conventional counterpart

Keywords

losses; magnetic flux; power convertors; power transformers; switching circuits; transformer cores; 100 W; 200 kHz; 5 V; ZVS; auxiliary circuit; core losses; efficiency; flux excursion; forward power converter topology; power transformer; self core reset; switching losses; zero voltage switching; Circuit topology; Power transformers; Steady-state; Switches; Switching circuits; Switching converters; Switching loss; Transformer cores; Virtual prototyping; Zero voltage switching;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.892834

Filename

892834