Comprehensive evaluation of interleaved zero current switching inverter against interleaved hard switching inverters in terms of efficiency, power density and EMI spectrum

This paper presents a comparison between two types of interleaved voltage source inverter (VSI) topologies, an Interleaved Zero-Current-Transition Inverter (IZCTI) and an Interleaved Hard-Switching Inverter (IHSI). Zero current transition in IZCTI is presented in switching trajectory and compared with hard switching trajectory to evaluate the switching loss reduction. Then four pulse test is devised to evaluate the switching loss in zero current transition, and experimental result is shown. As for IZCTI, an inter-phase inductance selection principle is proposed based on resonating circuit. Moreover, a scaled-down version 1 kW single phase inverter prototypes of both topologies are built to demonstrate the validity of topologies and their technique. A comprehensive comparison between IZCTI and IHSI is presented in terms of efficiency, power density and EMI performance.