LLC Resonant Converter With Matrix Transformer

Author

Daocheng Huang ; Shu Ji ; Lee, Fred C.

Author_Institution

Bradley Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ. (Virginia Tech), Blacksburg, VA, USA

Volume

29

Issue

8

fYear

2014

fDate

Aug. 2014

Firstpage

4339

Lastpage

4347

Abstract

In this paper, a high-efficiency high power density LLC resonant converter with a matrix transformer is proposed. A matrix transformer can help reduce leakage inductance and the ac resistance of windings so that the flux cancellation method can then be utilized to reduce core size and loss. Synchronous rectifier (SR) devices and output capacitors are integrated into the secondary windings to eliminate termination-related winding losses, via loss and reduce leakage inductance. A 1 MHz 390 V/12 V 1 kW LLC resonant converter prototype is built to verify the proposed structure. The efficiency can reach as high as 95.4%, and the power density of the power stage is around 830 W/in³.

Keywords

capacitors; inductance; interference suppression; rectifying circuits; resonant power convertors; transformer windings; AC resistance reduction; LLC resonant converter; SR device; capacitor; core size reduction; flux cancellation method; frequency 1 MHz; leakage inductance reduction; loss reduction; matrix transformer; power 1 kW; power density; secondary windings; synchronous rectifier; termination related winding loss elimination; voltage 12 V; voltage 390 V; Inductance; Matrix converters; Resistance; Transformer cores; Transmission line matrix methods; Windings; Flux cancellation; LLC resonant converter; magnetic integration; matrix transformer;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2013.2292676

Filename

6677543