POWER CONVERSION DEVICE

摘要

A DC link unit (3) is provided for outputting a rippling DC link voltage (Vdc), the DC link unit having a capacitor (3a) connected in parallel to the output of a converter circuit (2). An inverter circuit (4) is provided for switching and converting the output of the DC link unit (3) to alternating current, and feeding the alternating current to a connected motor (7). A controller (5) is provided for controlling the switching of the inverter circuit (4) so that the motor current (iu, iv, iw) ripples in synchrony with the rippling of a power source voltage (vin). The switching of the inverter circuit (4) is controlled by the controller (5) to reduce the ripple amplitude of the motor current (iu, iv, iw) in accordance with the load imposed by the motor (7) or the operating state of the motor (7).