Non-isolated ZVS-PWM boost chopper-fed dc-dc converter with auxiliary edge resonant snubber

This paper describes a high-frequency boost type ZVS-PWM chopper-fed dc-dc power converter with a single active auxiliary edge-resonant snubber in the load side which can make use of the pre-regulator of the small scale power conditioners such as solar photovoltaic generation, fuel cell generation, new type rechargeable battery and super capacitor energy storages. Its principle operation in steady-state is described in addition to its design example. The experimental results of boost type ZVS-PWM chopper-fed DC-DC power converter proposed here are evaluated and verified with a practical design model in terms of its measured switching voltage and current waveforms, the switching v-i trajectory and the temperature performance of the IGBT module, the actual power conversion efficiency, and the EMI of radiated and conducted emissions. The performance of this ZVS-PWM chopper-fed dc-dc power converter are discussed and compared with those of the hard switching one from an experimental point of view. Finally, this paper presents a practical method to suppress unwanted parasitic oscillation due to the active auxiliary resonant switch at ZCS turn-off mode transition with the aid of an additional lossless clamping diode loop, and can reduce the EMI conducted emission in this paper.