Analysis and Optimization of LLC Resonant Converter With a Novel Over-Current Protection Circuit

Author

Xie, Xiaogao ; Zhang, Junming ; Zhao, Chen ; Zhao, Zhuo ; Qian, Zhaoming

Author_Institution

Coll. of Electr. Eng., Zhejiang Univ., Hangzhou

Volume

22

Issue

2

fYear

2007

fDate

3/1/2007 12:00:00 AM

Firstpage

435

Lastpage

443

Abstract

A novel over-current protection (OCP) method for a LLC resonant converter has been proposed in this paper. This method is very attractive for its inherent current limit ability, especially under short-circuit condition. Combined with the frequency increasing method, good current limit features can be achieved. Compared to the conventional LLC resonant converter with frequency increasing method, LLC with the proposed OCP method can reduce the maximum frequency to an acceptable value. Detailed theoretical analysis and optimization design considerations have been presented. An experimental prototype converter based on the proposed method has been built up to verify the theoretical analysis. Experimental results meet the theoretical analysis very well

Keywords

overcurrent protection; resonant power convertors; short-circuit currents; LLC resonant converter; current limit ability; overcurrent protection circuit; short-circuit condition; Capacitors; Clamps; Design optimization; Frequency conversion; Magnetic resonance; Protection; Pulse width modulation; RLC circuits; Topology; Zero voltage switching; LLC; over-current protection (OCP);

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2006.889919

Filename

4118335