A Single-phase-to-three-phase Power Converter with an Active Buffer and a Charge Circuit

抄録

This paper proposes a new circuit configuration and a new control method for a single-phase-to-three-phase power converter with power decoupling function. The proposed converter does not require a large inductor and large smoothing capacitors in the DC link part. Such converters conventionally require large smoothing capacitors to absorb the power ripple with twice the power supply frequency. The proposed topology is constructed based on an indirect matrix converter with an active buffer to decouple the power ripple. The buffering energy is provided by the capacitor voltage variation rather than its capacitance. In addition, the transfer ratio between the input and output voltages is obtained to be 0.707 due to the connected charge circuit. The fundamental operations of the proposed converter are investigated by simulation and experiment. The experimental results reveal that the input and output current THD are 3.54 and 4.91%, respectively. An input power factor of over 99% is achieved. In addition, a maximum efficiency of 94.6% is obtained for a prototype circuit of 1kW.