A full-bridge current-source isolated DC/DC converter with reduced number of switches and voltage stresses for photovoltaic applications

Author

Feng Guo ; Lixing Fu ; He Li ; Alsolami, Mohammed ; Xuan Zhang ; Jin Wang ; Jie Zhang

Author_Institution

Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA

fYear

2014

fDate

13-15 Oct. 2014

Firstpage

133

Lastpage

138

Abstract

A full-bridge current-source isolated dc/dc converter for Photovoltaic applications is proposed in this paper. The converter utilizes a Quasi-Switched-Capacitor circuit as the secondary side, which features a reduced number of switches and voltage stresses, and an additional boost function. Through the proposed control algorithm, soft-switching can be realized for all switches. A 1.2 kW, 1 MHz, 40 V/ 400 V prototype is built and tested in the lab. To increase the efficiency at high switching frequency, GaN HEMT from Transphorm is implemented, and a peak efficiency of 92.7 % at 500 kHz and 89.0% at 1 MHz is achieved.

Keywords

DC-DC power convertors; photovoltaic power systems; full-bridge current-source isolated DC/DC converter; photovoltaic applications; quasi-switched-capacitor circuit; switching frequency; voltage stresses; Capacitors; Inductors; Integrated circuit modeling; Stress; Switches; Voltage control; Zero voltage switching; GaN HEMT; Photovoltaics; Quasi-Switched-Capacitor circuit; current-source converter;

fLanguage

English

Publisher

ieee

Conference_Titel

Wide Bandgap Power Devices and Applications (WiPDA), 2014 IEEE Workshop on

Conference_Location

Knoxville, TN

Type

conf

DOI

10.1109/WiPDA.2014.6964640

Filename

6964640