Pulse Energy Modulation for a Single-Phase Bridge Inverter with Power Decoupling Capability

Abstract

This paper presents pulse energy modulation (PEM) for a single-phase bridge inverter with voltage boosting and power decoupling capabilities. With PEM, the bridge inverter is operated under discontinuous conduction mode (DCM) when the instantaneous output power is low, and under continuous conduction mode (CCM) when the instantaneous output power is high. The switching losses of the bridge inverter are reduced due to the lower switching frequency of bridge stage and zero-current switching under DCM. In addition, PEM theoretically removes the low-order harmonics in voltage-reference active power decoupling method. Simulation and experimental results show the feasibility of PEM on single-phase bridge inverter with power decoupling capability.