DefinePK

Abstract

In this study a new soft-switching full-bridge dc-ac inverter working in the combination of current-fed mode and voltage-fed mode is proposed. The proposed circuit is inserted by two small flyback transformers to reduce the current spike, minimize switching loss at the turn-on instance and eliminate the interference on the non-working MOSFET from the working MOSFET, thus leading to high efficiency and reliable benefit over traditional full-bridge dc-ac inverters. At the same time, the implementation of control schemes is very simple. In this study, the proposed dc-ac inverter operating principle is analyzed and simulation and experimental results are given to demonstrate the validity and features of the soft switching and lower current spikes.