Digital implementation of load sharing method for interleaved LLC converters

Author

Zhiyuan Hu ; Yajie Qiu ; Yan-Fei Liu

Author_Institution

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

fYear

2013

fDate

23-26 June 2013

Firstpage

1

Lastpage

7

Abstract

LLC converter has been found advantageous in isolated DC-DC applications due to its high efficiency and low cost. However in high-power high-current applications, the high component stress and high conduction loss limit the maximum power capacity and reduce the efficiency. Interleaving technique can be employed to solve this problem, but the component tolerances of the resonant tanks will cause severe load sharing problem. This paper describes digital implementations of switch-controlled capacitor (SCC) modulated multiphase LLC converters (SCC-LLC) to achieve load sharing. A 600W two-phase interleaved SCC-LLC prototype is built to demonstrate the feasibility and advantages.

Keywords

DC-DC power convertors; capacitors; switching convertors; SCC-LLC converters; SCC-modulated multiphase LLC converters; component stress; component tolerances; conduction loss; digital implementation; efficiency reduction; high-power high-current application; interleaved LLC converters; interleaving technique; isolated DC-DC applications; load sharing method; maximum power capacity; power 600 W; resonant tanks; switch-controlled capacitor; two-phase interleaved SCC-LLC prototype; Capacitance; Capacitors; Logic gates; MOSFET; Pulse width modulation; Switching frequency; Synchronization;

fLanguage

English

Publisher

ieee

Conference_Titel

Control and Modeling for Power Electronics (COMPEL), 2013 IEEE 14th Workshop on

Conference_Location

Salt Lake City, UT

ISSN

1093-5142

Print_ISBN

978-1-4673-4914-7

Type

conf

DOI

10.1109/COMPEL.2013.6626420

Filename

6626420