A new quasi-parallel resonant DC link for soft-switching PWMinverters

摘要

A new quasi-parallel resonant DC-link inverter with the morenflexible pulse-width-modulation (PWM) capability and easier control isnproposed in this paper. With the addition of one coupling core and onendiode, the circuit can be directly applied to the single/three-phaseninverter to achieve the soft-switching action. For the proposedntopology, it needs neither the help of the inverter switch devices nornthe requirement of voltage/current sensors. Random duration of the zeronDC-link voltage can be obtained, and the voltage stresses of theninverter switches can be maintained to the minimum. The relativenanalysis of the presented circuit has been performed and verified by thenexperiment