| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a voltage reduction detection circuit capable of suppressing devices having a switching power supply circuit from being reset even when the switching power supply circuit temporarily stops oscillating.SOLUTION: The voltage reduction detection circuit includes: a voltage reduction detection section that detects voltage reduction of an AC voltage on the basis of a secondary voltage of a transformer provided in a switching power supply circuit supplied with the AC voltage; a reset section that resets a control section of a device having the switching power supply circuit when voltage reduction is detected by the voltage reduction detection section; and a nullification section that nullifies the voltage reduction detection section when the switching power supply circuit temporarily stops a switching operation.</p> |
