LLC converters with automatic resonant frequency tracking based on synchronous rectifier (SR) gate driving signals

Author

Feng, Weiyi ; Mattavelli, Paolo ; Lee, Fred C. ; Fu, Dianbo

Author_Institution

Center for Power Electron. Syst., Virginia Polytech. Inst. State Univ., Blacksburg, VA, USA

fYear

2011

fDate

6-11 March 2011

Firstpage

1

Lastpage

5

Abstract

In this paper, a novel switching frequency control scheme to track the resonant frequency point (f₀) is proposed. First, the synchronous rectifier (SR) gate driving signals are well tuned with proposed universal adaptive SR driving scheme by eliminating the body diode conduction. Then, the novel pulse width locked loop with digital implementation is presented to minimize the pulse width difference between main switch and well tuned SR gate driving signals, making LLC always operate at f₀ point.

Keywords

frequency control; rectifiers; resonant power convertors; LLC converters; automatic resonant frequency tracking; body diode conduction; digital implementation; pulse width locked loop; resonant converter; resonant frequency point; switching frequency control; synchronous rectifier gate driving signals; Converters; Logic gates; Phase locked loops; Resonant frequency; Strontium; Switches; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE

Conference_Location

Fort Worth, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-8084-5

Type

conf

DOI

10.1109/APEC.2011.5744567

Filename

5744567