AC/DC converter for a compressor driver and air conditioner with a troubleshooting mechanism for faulty bidirectional switches

摘要

An AC/DC converter that performs failure detection of a bidirectional switch includes resisters 6, 7 connected in series between the output terminals of a rectifier 3, capacitors 9, 10 connected in series between the output terminals of a rectifier 3, a bidirectional switch 4 having one end connected to one input terminal of the rectifier 3, a bidirectional switch 5 having one end connected to the other input terminal of the rectifier 3, a bidirectional switch 8 having one end connected to a junction of the resistors 6, 7 and the other end connected to the junction of the capacitors 9, 10, voltage detection means for detecting at least two voltages of the voltages of the resistors 6 and 7 and the voltage between the output terminals of the rectifier 3, and abnormal detection means 20 for detecting a failure of the bidirectional switches, wherein the other ends of the bidirectional switches 4 and 5 are connected to the junctions of the resistors 6, an 7, and the abnormal detection means 20 detects a failure based on a result of detection of the voltage detection means.