Abstract
This paper focuses on the galvanically isolated quasi-Z-source dc–dc converter with a novel zero voltage and zero current switching technique. The unique feature of the impedance network lies in combining the buck–boost operation capability with the short- and open-circuit immunity of transistors; at the same time, it can perform zero voltage and zero current switching on the primary side. The boundary conduction mode of the current in the second inductor of the quasi-Z-source network was used along with snubber capacitors in the two out of four transistors and a special control algorithm to achieve full zero-switching operation of the inverter. Simulation and experimental results prove the discussed ideas. Possible modifications of the algorithm and future applications are also described.
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