抄録
The Discontinuous-Switching-Modulation (DSM) scheme has been developed and practically applied to the 3-phase Voltage-Source-Inverters to improve the dc-voltage utilization factor or to get a higher ac-output-voltage from a limited dc-voltage. On the other hand, the DSM is easily applicable to 3-phase Current-Source-Inverters/Rectifiers by referring to the Delta-Current-Modulation scheme that has been developed by one of the authors. This paper shows that the maximum controllable dc-voltage in the 3-phase Buck-type PFC rectifiers can be increased by 15% by means of the DSM and it has been confirmed through experimental results obtained from a 4kW class setup. Because of the maximum dc-voltage increase, the efficiency can be increased too and the fact has been confirmed experimentally. Additionally, the remaining problems/possibilities to be solved/explored in this project are discussed.
