| 摘要 |
<p>This invention relates to a power supply circuit protecting method and a power supply circuit protecting apparatus. The apparatus is provided with a power supply circuit 3 for converting a voltage from a three-phase alternating current inputting power supply 1 into a predetermined voltage, and an output operation circuit 6 for performing a predetermined operation by adopting an output voltage from the power supply circuit 3 as input. In the apparatus, based on a current value on the input side or the output side of the power supply circuit 3, abnormality of the supply voltage is judged, and when there is an abnormality, the output operation circuit 6 is controlled.</p> |
