Phase-shift Soft-switching Pwm Technology

Soft-switching PWM technique integrates the advantage of resonant converter and constant frequency modulator , which realizes zero-voltage-switching in constant frequency, and is one of the development trends of power electronics. Only adding a resonant inductor, stress of voltage and current in devices turns lower than traditional PWM hard-switching, without no increasing cost and complication of circuit. Phase-shifted zero-voltage-switching PWM converter (PS-ZVS-PWM converter) is one of the topologies using soft-switching PWM technique, and is suited for middle to high power dc-to-dc conversion applications.This dissertation analyzes the operation principle of PS-ZVS-PWM converter systemically. The realization conditions and ways of ZVS, the reasons and the realization methods of loss duty of secondary are discussed. Designing a 42V/360A power supply for phased-array Radar, expatiate characteristic of PS-ZVS-PWM technology and key technical point of solution.