Power supply monitoring circuit

The utility model discloses a power supply monitoring circuit, and the circuit comprises a detection circuit and a power conversion circuit. The detection circuit is connected with the power conversion circuit; the detection circuit comprises a first threshold circuit, a second threshold circuit and a third threshold circuit; the second threshold circuit is respectively connected with the first threshold circuit and the third threshold circuit; the detection circuit is used for setting a power-on threshold value and a power-off threshold value through the first threshold circuit, the second threshold circuit and the third threshold circuit, and filtering fluctuation of power supply voltage; and the power conversion circuit is used for converting 12V voltage input by the detection circuit into 5V voltage. According to the utility model, the technical problems that the power-down logic level delay and the voltage instability cannot be realized by the existing detection circuit are solved. 本实用新型公开了一种电源监测电路，其中，所述