Title :
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
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;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE
Conference_Location :
Fort Worth, TX
Print_ISBN :
978-1-4244-8084-5
DOI :
10.1109/APEC.2011.5744567
