Analysis of conducted EMI emissions on a soft-switched full bridge dc-dc converter with a fixed switching frequency

This paper presents a comparative study between a soft-switched full bridge DC-DC converter using phase-shifted pulse-width-modulation (PSFB-PWM) and another one with PWM control without phase-shifted strategy. The converter using phase-shifted control achieves zero-voltage and zero-current switching (ZVZCS), whereas the other without using phase-shifted control achieves ZVS. The paper describes the operating characteristics and analyzes the performance of both circuits, includes a comparison of conducted electromagnetic interference (EMI) emissions from both converters, and provides experimental results that are in good agreement with the theoretical ones.