A Comparative Analysis on a Single-Phase Inverter With a Reduced Component Count Power Decoupling Circuit

An experimental and simulation analysis of an active power decoupling method that does not require additional power semiconductors is presented in this paper. The inverter performance is analyzed in terms of capacitors requirement, efficiency, and steady-state operation and compared to the conventional inverter. The control method of the power decoupling method uses DC-link voltage to generate compensation voltage for controlling the voltage between the two inverter arms. In this way the low-frequency DC-link current ripple is attenuated to a negligible value, allowing the replacement of DC-link electrolytic capacitors with smaller and more reliable thin film capacitors. The design was also analyzed from the perspective of capacitors volume. A losses analysis was carried out on a 1kW rated inverter implemented with silicon carbide MOSFETs, which showed the performance of the proposed inverter and revealed further optimizations to be addressed.