A hybrid driving scheme for full-bridge synchronous rectified LLC resonant DC/DC converter

Author

Huang, Xiucheng ; Wang, Jianfeng ; Zhang, Junming ; Qian, Zhaoming

Author_Institution

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

fYear

2011

fDate

6-11 March 2011

Firstpage

579

Lastpage

584

Abstract

A novel hybrid driving scheme for full-bridge synchronous rectified LLC resonant DC/DC converter is proposed in this paper. With the full-bridge type rectifier, the voltage stress of the synchronous rectifiers (SRs) is well clamped to the output voltage. Also the transformer structure is very simple due to only one secondary winding is needed. Therefore, the converter can utilize SRs with lower breakdown voltage rating to improve the efficiency as well as to reduce the transformer core loss and conduction loss. A new hybrid driving scheme combining voltage driving method and current driving method for SRs are proposed to drive the four SRs with simple structure. With the proposed SR driving scheme, the LLC resonant converter achieves good performance and high efficiency. The experimental results from a 200kHz, 120W (16V/7.5A) prototype verifies the theoretical analysis.

Keywords

DC-DC power convertors; rectifiers; transformer windings; breakdown voltage rating; conduction loss; current 7.5 A; current driving method; frequency 200 kHz; full-bridge synchronous rectified LLC resonant DC/DC converter; full-bridge type rectifier; hybrid driving scheme; power 120 W; secondary winding; synchronous rectifiers; transformer core loss; transformer structure; voltage 16 V; voltage driving method; voltage stress; Converters; Current transformers; Inductance; Magnetic resonance; Rectifiers; Strontium; Windings;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE

Conference_Location

Fort Worth, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-8084-5

Type

conf

DOI

10.1109/APEC.2011.5744654

Filename

5744654