Patent ID: 8159850

Claim:
A converter control device, including an arrangement in which a plurality of converters are connected together in parallel, the converters being connected between a first power source and a second power source and each having a plurality of switching elements and a reactor to convert a voltage in both directions between the first and second power sources, and changes the number of converter phases to be driven according to converter passing power, the converter control device comprising: a control unit feeding back a measured value of duty ratio of an actual operation with respect to an instruction value of the duty ratio provided to the plurality of switching elements for the voltage conversion, to inhibit a deviation between the measured value of the duty ratio and the instruction value of the duty ratio by PID control; a storage section which, in order to correct the integration term in the PID control, predetermines and stores a correction function for the integration term in each drive phase quantity, the correction function corresponding to a relationship between converter passing power and a correction value for the integration term; and a correction function switching section which, when number of drive phases is changed according to the converter passing power, switching to the correction function for the integration term corresponding to the changed number of drive phases of the converters, wherein the first and second power sources are different from one another.