Patent ID: 6560130
Filing Date: 2003-05-06
Classification: H02M

Abstract:
A control circuit for controlling a power converting apparatus producing a three-phase power output from input direct current power by opening and closing switches coupled to the input direct current power the control circuit comprising:current detecting means for detecting output currents of each phase of a three-phase power converting apparatus; three-phase current command generating means for generating three current command values; adding/subtracting means for calculating current deviations between respective current command values and output currents; voltage detecting means for detecting a voltage of each phase of a three-phase power supply, each phase being connected, via a respective reactor, to the power converting apparatus and for producing power supply voltage vectors from the voltages of each of the phases of the three-phase power supply that is detected; and switching command generating means for producing a current deviation vector from the current deviations, establishing an allowable region for the current deviation vector, and determining whether the current deviation vector is located within the allowable region, obtaining moving directions for the current deviation vector with respect to each of a plurality of output voltage vectors of the power converting apparatus, based upon the output voltage vectors, and selecting and outputting, from the plurality of output voltage vectors, at least one output voltage vector producing a moving direction for moving the current deviation vector toward and into the allowable region for controlling opening and closing of the switches.