Cross regulation in flyback converters: analytic model and solution

Author

Ji, Chuanwen ; Smith, K. Mark, Jr. ; Smedley, Keyue M. ; King, Ken

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA

Volume

16

Issue

2

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

231

Lastpage

239

Abstract

An analytical model for studying cross regulation among the multiple outputs of flyback converters is presented in this paper. Both the theoretical and experimental results show that the cross regulation can be improved by lowering the clamp voltage, which has not been previously reported. Many other factors, such as the leakage inductance in primary and secondary windings, the magnetizing inductance, and the air gap can also affect the cross regulation. Detailed analysis and test results are provided. Based on this model, a cost-effective passive energy regenerative clamp is proposed that allows the clamp voltage to be much lower than that of traditional RC clamps, thus improving the cross regulation and energy efficiency

Keywords

inductance; magnetisation; power convertors; voltage control; AC-DC converter; DC-AC converter; air gap; clamp voltage; clamp voltage lowering; cross regulation; energy efficiency; flyback converters; leakage inductance; magnetizing inductance; multiple outputs; passive energy regenerative clamp; primary windings; secondary windings; voltage control; Analytical models; Clamps; Energy efficiency; Inductance; Inductors; Magnetic analysis; Switches; Switching converters; Testing; Voltage;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.911147

Filename

911147