Synchronous Rectification LLC Series-Resonant Converter

Author

Hsieh, Guan-Chyun ; Tsai, Cheng-Yuan ; Hsu, Wei-Li

Author_Institution

Department of Electrical Engineering, Tung Nan Institute of Technology, 152, Sec. 3, Pei-Shen Rd., Shen-Keng, Taipei, Taiwan 222, ROC. gchsieh@mail.tnit.edu.tw

fYear

2007

fDate

Feb. 25 2007-March 1 2007

Firstpage

1003

Lastpage

1009

Abstract

The primary goals in use of half-bridge LLC series-resonant converter (LLC-SRC) are high efficiency, low noise, and wide-range regulation. A voltage-clamped drive circuit for simultaneously driving both primary and secondary switches is proposed to achieve synchronous rectification (SR) at switching frequency higher than the dominant resonant frequency. No high/low-side driver circuit for half-bridge switches of LLC-SRC is required and less circuit complexity is achieved. The SR mode LLC-SRC developed for reducing output rectification losses is described along with steady-state analysis, gate drive strategy, and its experiments. Design consideration is described thoroughly so as to build up a reference for design and realization. A design example of 240W SR LLC-SRC is examined and an average efficiency as high as 95% at full load is achieved. All performances verified by simulation and experiment are close to the theoretical predictions.

Keywords

Circuit noise; Complexity theory; Driver circuits; RLC circuits; Resonant frequency; Strontium; Switches; Switching circuits; Switching frequency; Voltage; LLC-SRC; SR; voltage-clamped drive circuit;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference, APEC 2007 - Twenty Second Annual IEEE

Conference_Location

Anaheim, CA, USA

ISSN

1048-2334

Print_ISBN

1-4244-0713-3

Type

conf

DOI

10.1109/APEX.2007.357637

Filename

4195841