ZVS based DC/AC Modular Hybrid converter for HVAC Applications

Abstract

The basic configurations of the voltage-mode resonant switches are presented. The circuit's operating principles are described using a voltage-mode quasi-resonant boost converter. This paper proposes a zero voltage switching (ZVS) technique for bidirectional dc/dc converters. The dc/dc unit considered consists of two distinct bidirectional dc/dc cells paralleled at both input and output and whose two input bridges are coupled by means of passive inductive branches. In this topology, the NPC is used to supply the active power while the HBs operate as series active filters, improving the voltage waveform quality by only handling reactive power.