Bang-Bang Charge Control for LLC Resonant Converters

Author

Zhiyuan Hu ; Yan-Fei Liu ; Sen, P.C.

Author_Institution

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

Volume

30

Issue

2

fYear

2015

fDate

Feb. 2015

Firstpage

1093

Lastpage

1108

Abstract

This paper proposes a Bang-Bang Charge Control (BBCC) method for LLC resonant converters. Instead of switching frequency control, the BBCC method utilizes the series resonant capacitor voltage level to trigger the MOSFETs´ switching actions. Advantages of the proposed method include fast dynamic performance and simple implementations. Small-signal analysis shows that the loop bandwidth can achieve around 1/6 of the switching frequency in all operating conditions. Experimental results show that 5 to 25 A load step transients are completed within only seven switching cycles at both 400- and 300-V input-voltage conditions. Practical considerations are also discussed in detail.

Keywords

bang-bang control; field effect transistor switches; power capacitors; resonant power convertors; BBCC; LLC resonant converters; MOSFET switching actions; bang-bang charge control; fast dynamic performance; loop bandwidth; series resonant capacitor voltage level; small-signal analysis; step transients; voltage 300 V; voltage 400 V; Capacitors; Latches; Logic gates; Switches; Switching frequency; Voltage control; Charge control; resonant power conversion; switched-mode power supply; transient response;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2313130

Filename

6777331