Patent ID: 7868569

Claim:
A motor driving apparatus which comprises a converter for converting an AC voltage from an AC power source into a DC voltage, an inverter for converting the converted DC voltage back into an AC voltage, a capacitor connected in parallel in a link section between the converter and the inverter, and a charge/discharge control circuit for controlling charge to and discharge from the capacitor, wherein a smoothing capacitor is connected between the converter and the inverter, and the capacitor connected in parallel in the link section is connected in parallel with the smoothing capacitor via the charge/discharge control circuit, and wherein said motor driving apparatus further comprises a current control means for controlling discharge current from the charge/discharge control circuit based on at least one of the following values (1) to (5) so that input/output current or input/output power of the converter is equal to a prescribed value: (1) input current or input power to the inverter; (2) output power from the inverter; (3) motor output power; (4) input current or input power to the converter; and (5) output current or output power from the converter.