| 摘要 |
A power conversion device for outputting AC power having variable voltage and variable frequency, the power conversion device comprising: a forward converter for rectifying and converting AC voltage of an AC power source into DC voltage; a DC intermediate circuit having a smoothing capacitor for smoothing the DC voltage of the forward converter; a current-limiting circuit for suppressing a charge current to the smoothing capacitor of the DC intermediate circuit; a voltage detection circuit for detecting the voltage of the DC intermediate circuit; and a reverse converter for converting the DC voltage of the forward converter into AC voltage. A plurality of relays are connected in parallel to a resistor of the current-limiting circuit, and the plurality of relays are switched on when the rate of change of the voltage detection value of the DC intermediate circuit is equal to or less than a value set in advance. |
