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

A strategy for realizing a medium-power AC/DC power converter module using the zero-voltage-switching pulse-width modulation (ZVS-PWM) technique is presented. A full-bridge topology is employed and dominated by the phase-shift technique. A voltage-mode control scheme is installed to acquire good voltage regulation. The valid duty and the sub-duty intervals in the full-bridge loop are 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, realizing a 625 W ZVS-PWM power converter module with parallel sharing ability is conducted in order to assess the system performance