Realization study of medium-power module AC/DC converter by zero-voltage-switching PWM technique

A strategy for realizing a medium-power module AC/DC converter by zero-voltage-switching pulse-width modulation (ZVS-PWM) technique is presented. A full-bridge topology is employed and dominated by phase-shift technique. A voltage-made control is installed to acquire good voltage regulation. The valid duty and the sub-duty intervals in the full-bridge Loop is exactly estimated. The complete primary current profile with respect to each transition interval of the phase-shift process is derived and modeled. A maximum current sharing technique is used as the modulus parallel strategy in the design. A design example of realizing a module 625-watt ZVS-PWM converter with parallel sharing ability is conducted to assess the system performance.