Single-Phase Inverter With Wide Input Voltage and Power Decoupling Capability

Abstract

This paper proposes a single-phase inverter to achieve high power factor, wide input voltage range, and ripple power decoupling without using large passive components. The proposed inverter is obtained by rearranging the positions of the switches and passive components in the exiting circuit. Given that, a wider dc input voltage range can be obtained since it is no longer bounded by half the grid peak voltage. In addition, the inherent low-frequency ripple power is buffered, rather than through increasing the capacitance, by swinging the decoupling capacitor voltage resulting in an improvement of the power density and system lifetime. Furthermore, with adopting a closed-loop control method, no dedicated power-buffering controller is required. This paper starts with introducing the derivation of the proposed inverter followed by the operation principles and circuit analysis. A comparison between the derived circuit and the original one is carried out to show the pros and cons. Finally, a 200-W prototype is constructed to demonstrate the effectiveness of the proposed topology.