Abstract
Conference Title: 2014 IEEE Workshop on Wide Bandgap Power Devices and Applications (WiPDA) Conference Start Date: 2014, Oct. 13 Conference End Date: 2014, Oct. 15 Conference Location: Knoxville, TN, USA 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.