A Full-Bridge Boost LCL-Type DC/AC/DC Converter

Abstract

This paper presents a full-bridge boost LCL-type dc/ac/dc converter with a capacitive output filter and operating with a constant output voltage. When the input voltage has changed, the frequency changes with a constant turn-off time of transistors to keep the output voltage constant. Based on this idea, a 50 to 100V dc input, 100-120kHz, 400-W, 200-V dc output converter has been built, and a fourier’s mathematical description is exploited to help the design. Finally, a report on the implementation of a laboratory prototype with 400-W power is presented.