ABSTRACT A current‐source converter (CSC)‐derived AC/DC matrix‐type converter is well‐suited for applications requiring a wide range of battery or three‐phase AC voltages. However, the H‐bridge side of the isolated CSC matrix converter suffers from large voltage spikes and ringing. These transients are excited by switching actions on the LC resonant circuit formed by the H‐bridge parasitic capacitance, transformer leakage inductance, and output inductance. This paper provides an in‐depth state‐trajectory analysis to illustrate the generation of these spikes and ringing during inverter operation. Two distinct mechanisms of spike and ringing generation are identified and analyzed; the mechanism caused by current mismatch is of primary concern due to its significantly higher peak voltage. To address this, a two‐step commutation scheme with adaptive switching timing is proposed to significantly reduce the magnitude of the voltage spikes and ringing on the boost H‐bridge. Additionally, the proposed commutation scheme achieves zero‐voltage switching (ZVS) for all bidirectional switches of the three‐phase isolated matrix converter. The effectiveness of the proposed scheme and the resulting voltage spike reduction on the H‐bridge are verified through simulations and experiments on a SiC‐based matrix converter prototype.
Gong et al. (Thu,) studied this question.