POWER CONVERSION DEVICE, POWER CONVERSION DEVICE MODULE, AIR CONDITIONER, AND FREEZING DEVICE

摘要

A power conversion device includes: a plurality of reactors (L1, L2, L3) each having one end thereof connected to each phase of an AC power supply (1); a converter circuit (4) connected to the other ends of the plurality of the reactors to convert AC power to DC power; a smoothing capacitor (5) connected between the DC terminals on the output side of the converter circuit; a current detection circuit (7, 32) for detecting a DC bus current Ish constituting the sum of the load current and the current flowing in the smoothing capacitor; a voltage detection circuit (8) for detecting the output DC voltage of the converter circuit; and a control unit (6) for controlling the converter circuit using the current value detected by the current detection circuit and the voltage detection value detected by the voltage detection circuit. The occurrence of a change in the source voltage of the power supply is determined based on the change amount of the voltage detection value and the change amount of the current value.