Novel FB-ZVZCS-PWM Converter Based on Phase-Shift Control

A novel topological structure for full-bridge (FB) zero-voltage and zero-current switching (ZVZCS) converter based on phase-shifted pulse-width modulation (PS-PWM) was proposed to overcome the shortcomings of the existing topological structures, such as high current stress, complex control and narrow load range. This topological structure can not only realize soft switching steadily to both leading and lagging legs when the load rate is higher than 15%, but also make current stress decrease largely. In addition, a small signal model for the topological structure was established, and its dynamic performance was simulated numerically using software Matlab. Finally, a converter prototype with a capacity of 8 kW and an output voltage of 110 V was developed to prove the correctness of the theoretical analysis and the rationality of the parameter design.