Abstract: A voltage control portion generates a current command for controlling a voltage to an inverter input voltage command. A dividing portion divides the current command into first and second current commands in accordance with a division ratio from a division ratio setting portion. A first current control portion generates a modulated wave for controlling a current of a first converter to the first current command. A second current control portion generates a modulated wave for controlling a current of a second converter to the second current command.

Abstract: First and second converters are connected in parallel to positive and negative lines, respectively. When a required power is smaller than a reference value, an ECU controls the first and second converters such that one of the first and second converters operates and the other stops. When the required power is equal to or larger than the reference value, the ECU controls the first and second converters such that both the first and second converters operate.