Zero-voltage-transition converters using a simple magnetic feedback technique

This paper presents a simple active energy recovery circuit which can be magnetically coupled to any isolated or nonisolated switching power converter to achieve zero-voltage switching (ZVS) of the power devices. Converters using this soft-switching technique exhibit low voltage and current stresses characteristic of hard-switched PWM converters, yet achieve ZVS thus enabling higher frequency operation. Based on this technique, an experimental 300 W, 250 kHz boost converter is designed for offline power factor correction. Steady-state analysis as well as simulations are also presented