| 摘要 |
When a refrigeration cycle problem occurs, an inverter motor which an air-conditioner is provided with is reliably halted, and the contacts of a main relay are prevented from degrading or welding. The power circuit (1) of the air-conditioner is provided with a rectifier circuit (RC), a capacitor (C) (smoothing unit), a main relay (10) provided on the current path between the rectifier circuit (RC) and the capacitor (C), an inverter circuit (30), a microcomputer (100), and a delay circuit (40). The microcomputer (100) is provided with an inverter circuit controller (110), a main relay switching controller (120), a waveform forced cutoff unit (130), and a cutoff signal output unit (140). When, with the main relay (10) closed, a high-pressure switch (200) (malfunction detector) detects a high-pressure anomaly and outputs a high-pressure anomaly signal to the waveform forced cutoff unit (130), the waveform forced cutoff unit (130) electrically cuts off the inverter circuit controller (110), and the cutoff signal output unit (140) outputs a cutoff signal to the main relay (10), via the delay circuit (40), that opens the main relay (10). |
