Electric equipment power supply frequency abnormity detection circuit and method

• Main Authors: YANG YONGYUE, HUANG MENG, CHEN MANLIN, FU PENGLIANG, JIANG YINGYI
• Format: Patent
• Language: Chinese; English
• Published: 29.04.2022
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses an electric equipment power supply frequency abnormity detection circuit and method. The circuit comprises an XOR logic module which is used for inputting a power supply frequency detection signal and a square wave signal with the same frequency and phase as the power supply frequency detection signal, and performing XOR logic processing to generate a sampling signal; wherein the duty ratio of the square wave signal is equal to the duty ratio of the power supply voltage when the frequency is normal; the input end of the difference detection module is connected with the XOR logic module, and the difference detection module is used for converting the sampling signal into a direct current signal and outputting the direct current signal to a digital signal processor; and the digital signal processor is used for judging whether the power supply frequency is abnormal or not according to the voltage value carried by the direct current signal. According to the invention, false alarm of power s