Voltage monitoring method and circuit for low-voltage power supply of new energy automobile

The invention provides a voltage monitoring method and circuit for a low-voltage power supply of a new energy automobile, and the circuit comprises a sampling unit, a voltage dividing unit and a comparison unit, and the comparison unit comprises a first comparator and a second comparator; the sampling unit samples the monitored voltage to obtain a sampling reference value and transmits the sampling reference value to the first comparator and the second comparator respectively; the voltage division unit performs voltage division on a reference power supply and obtains a first voltage division value and a second voltage division value; the first voltage division value output by the voltage division unit is connected to a first comparator, and the second voltage division value output by the voltage division unit is connected to a second comparator; when the monitored voltage is within the range of the first partial voltage value and the second partial voltage value, the first comparator and the second comparator