POWER CONVERSION DEVICE

摘要

A transformer is composed of three or more windings magnetically coupled. An AC/DC converter (2) for converting AC power of an AC power supply (1), a capacitor (3), and a switching circuit (4) are connected to one winding (6a), and a switching circuit (8) or (30) for power conversion of a DC power supply is connected to at least one of the other windings. Voltage of the capacitor (3) or the AC power supply (1) is detected. On the basis of the detected value thereof, the operation state of each switching circuit (4), (8), (30) is determined by an operation state determination circuit (101). On the basis of a result of the determination, the power supply is switched among the AC power supply (1) and the DC power supplies (11) and (34) by an output switch circuit (103).

主权项

1. A power conversion device connected to an AC power supply and a DC power supply, the power conversion device comprising:
a transformer having three or more windings magnetically coupled with each other; an AC/DC converter for converting power outputted from the AC power supply to DC; a capacitor for smoothing the power DC-converted by the AC/DC converter; a first switching circuit for converting the power smoothed by the capacitor to AC and outputting the resultant power to one of the three or more windings; a switching circuit which is connected to at least one of the others of the three or more windings and converts power inputted to the DC power supply or power outputted from the DC power supply; a voltage detection unit for detecting voltage of the capacitor; and a power supply switch unit for switching a power supply source between the AC power supply and the DC power supply on the basis of a detection value from the voltage detection unit.