| 摘要 |
A voltage monitoring device 30 includes an AC input portion 31, a rectifier circuit 32, and a detection circuit 33. The AC input portion 31 receives alternating current output from a DC-AC inverter unit 13. The rectifier circuit 32 rectifies the alternating current received at the AC input portion 31. The rectifier circuit 32 is formed by a full-wave rectifier circuit. The detection circuit 33 detects the output voltage of the rectifier circuit 32. The detection circuit 33 includes a differential amplifier circuit 34. First and second capacitors C1 and C2 are respectively connected to two wires 36a and 36b, which connect the AC input portion 31 and the rectifier circuit 32. The capacitors C1 and C2 are set to have the same capacitance.
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