Advantages of using a two-switch forward in single-stage power factor corrected power supplies

Author

Petersen, Lars

Author_Institution

Dept. of Appl. Electron., Tech. Univ. Denmark, Lyngby, Denmark

fYear

2000

fDate

2000

Firstpage

325

Lastpage

331

Abstract

A single-stage power factor corrected power supply using a two-switch forward is proposed to increase efficiency. The converter is operated in the DCM (discontinues conduction mode) and it is shown that this operation mode ensures the intermediate DC-bus to be controlled only by means of circuit parameters and therefore independent of load variations. The DCM operation often has a diminishing effect on the efficiency but by use of the two-switch topology high efficiency with minimum circuit complexity can be achieved in this mode. A 500 W 70 V prototype of the two-switch boost-forward PFC power supply has been implemented. The measured efficiency is between 85% and 88.5% in the range 30 W-500 W and the measured power factor at full load is 0.95

Keywords

DC-DC power convertors; power factor correction; power supplies to apparatus; 30 to 500 W; 500 W; 70 V; 85 to 88.5 percent; DC/DC converter; circuit parameters; discontinues conduction mode operation; efficiency increase; high efficiency; intermediate DC-bus; minimum circuit complexity; single-stage power factor corrected power supplies; two-switch boost-forward PFC power supply; two-switch forward; Circuit topology; Complexity theory; Control systems; Load management; Power measurement; Power supplies; Reactive power; Switches; Switching converters; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Telecommunications Energy Conference, 2000. INTELEC. Twenty-second International

Conference_Location

Phoenix, AZ

Print_ISBN

0-7803-6407-4

Type

conf

DOI

10.1109/INTLEC.2000.884269

Filename

884269