POWER CONVERSION DEVICE

摘要

The uninterruptible power supply device comprises a filter (13) for removing, from the voltage at a power supply node (N1) between a converter (6) and an inverter (8), ripple voltage having frequency twice the frequency of the output voltage (VAC2) of the inverter (8) and generating a DC voltage (VDC). The filter (13) includes an extraction unit (13a) for extracting the ripple voltage from the voltage at the power supply node (N1) and a subtraction unit (13b) for subtracting the ripple voltage extracted by the extraction unit (13a) from the voltage at the power supply node (N1) and generating the DC voltage.