A phase-shift modulated double tuned resonant DC/DC converter: analysis and experimental results

Analysis, design, and experimental results of a double-tuned resonant DC/DC converter are presented. The resonant circuit employed in the converter consists of a series branch in which an inductor and a capacitor are connected in parallel. The components of both branches are tuned at the operating frequencies of the converter. The proposed resonant circuit provides reduced switching and conduction losses for a wide range of input voltage and output load variations. A detailed description of the converter circuit, explaining operating modes, it is given. A prototype converter was built. It operates at a 256 kHz clock frequency and delivers 5 V, 100 A DC from a nominal 48 V DC input. Experimental results show an overall efficiency of about 86% from full-load to 1/4 load