High-Efficiency T-Source Inverter With Low Voltage Spikes Across the Switch Bridge

Coupled-inductor-based impedance-source inverters have been suggested as a solution for improving the voltage boost capability. However, large voltage spikes can sometimes appear across the switch bridge if the leakage inductance of the coupled inductor cannot be nullified. Higher voltage-rated switches are, therefore, necessary for implementing each inverter with generally lower efficiency anticipated. To solve the above issues, this article proposes a high-efficiency T-source inverter (HE-TSI) with leakage energy recycled through several passive elements and, hence, avoided voltage spikes across the switch bridge. To reveal the prominent characteristics of the HE-TSI, it has been compared with the traditional T-source inverter in the terms of extents of voltage spikes across the switch bridge, voltage stresses, current stresses, and efficiency. The simulation and experimental results have verified the validity of the proposed HE-TSI.