A Zero-Crossing Noise Filter for Driving Synchronous Rectifiers of LLC Resonant Converter

Author

Dong Wang ; Yan-Fei Liu

Author_Institution

Dept. of Electr. & Comput. Eng., Queen´s Univ., Kingston, ON, Canada

Volume

29

Issue

4

fYear

2014

fDate

Apr-14

Firstpage

1953

Lastpage

1965

Abstract

A new driving method for synchronous rectifier (SR) in LLC resonant converter is presented. By adding a zero-crossing noise filter (ZCNF) to the drain and source of the SR FET, the false-triggering of the SR can be effectively eliminated. Moreover, the resistor and the capacitor in the filter can be used as a compensator to solve the duty-cycle loss issue caused by the trace inductance of the MOSFET package. Only three passive components are needed in the proposed filter, which makes it reliable and easy to implement. Simulation and experimental results show that the ZCNF can significantly improve the reliability as well as the efficiency of the power circuit. A prototype of 400 V to 12 V 600-W half-bridge LLC resonant converter is built to verify the advantages of the ZCNF. An efficiency improvement of 0.8% is achieved by the ZCNF.

Keywords

MOSFET; driver circuits; passive filters; rectifiers; resonant power convertors; semiconductor device reliability; LLC resonant converter; MOSFET package; SR FET; ZCNF; capacitor; compensator; driving method; duty-cycle loss issue; efficiency 0.8 percent; passive components; power 600 W; power circuit; reliability improvement; resistor; synchronous rectifiers; trace inductance; voltage 400 V to 12 V; zero-crossing noise filter; Dead time control; LLC dc–dc converter; resonant converter; synchronous rectifier (SR); zero-crossing noise filter (ZCNF);

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2013.2264774

Filename

6519326