Power conversion device with ripple filtering

摘要

An uninterruptible power supply device including a filter for rejecting, in the voltage of a power supply node between a converter and an inverter, a ripple voltage of a frequency twice a frequency of an output voltage of the inverter to generate a DC voltage. This filter includes an extraction unit for extracting the ripple voltage from the voltage of the power supply node, and a subtraction unit for subtracting the ripple voltage extracted by the extraction unit from the voltage of the power supply node to generate the DC voltage.