A Universal Adaptive Driving Scheme for Synchronous Rectification in LLC Resonant Converters

Author

Feng, Weiyi ; Lee, Fred C. ; Mattavelli, Paolo ; Huang, Daocheng

Author_Institution

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

Volume

27

Issue

8

fYear

2012

Firstpage

3775

Lastpage

3781

Abstract

In this paper, a universal adaptive driving scheme for synchronous rectification (SR) is proposed. The drain to source voltage of the synchronous rectifier is sensed so that the paralleled body diode conduction is detected. Using the proposed SR driving scheme, the SR turn-OFF time is tuned to eliminate the body diode conduction. The SR gate driving signal can be tuned within all operating frequency regions. Moreover, a simple digital implementation is introduced. Compared with analog ones, it enables more intelligent and precise SR control, improving converter efficiency. For rapid prototyping purposes, the digital SR tuning system is realized in Cyclone III field-programmable gate array (FPGA).

Keywords

field programmable gate arrays; rectification; resonant power convertors; Cyclone III field-programmable gate array; FPGA; LLC resonant converters; SR control; converter efficiency improvement; digital SR tuning system; drain to source voltage; gate driving signal; paralleled body diode conduction; synchronous rectification; turn-OFF time; universal adaptive driving scheme; Logic gates; Resonant frequency; Strontium; Switching frequency; Threshold voltage; Transient analysis; Tuning; Digital control; LLC resonant converter; synchronous rectification (SR);

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2012.2184304

Filename

6130604