Patent ID: 9557353
Date: 2017-01-31
CPC Classifications: G01R,G06F,H02H

Claim:
1. A power supply detecting circuit comprising: a power supply module configured to receive a first voltage signal from an alternating current (AC) power source and comprising a bridge rectifier circuit coupled to the first voltage signal and a buck converter connected to the bridge rectifier; a voltage converting circuit configured to convert the first voltage signal to a second voltage signal; a switch circuit connected to an output terminal of each of the voltage converting circuit and the buck converter; a micro control unit (MCU) connected to the switch circuit; and a display module connected to the MCU; wherein the switch circuit compares an output voltage of the buck converter with the second voltage signal and outputs a detecting signal to the MCU according to the result of comparing, the MCU determines whether the first voltage signal is within a predetermined range according to the detecting signal and sends a result of determination to the display module which displays the result.