CIRCUIT AND METHOD FOR DETECTING INSULATION RESISTANCE

The present application discloses a circuit and a method for detecting insulation resistance. The circuit includes: a first voltage dividing module, a second voltage dividing module, a third voltage dividing module, a fourth voltage dividing module, a first switch module, a fifth voltage dividing module, a second switch module, a third switch module, and a detecting module, where the first voltage dividing module comprises a first voltage dividing unit and a second voltage dividing unit, and the third voltage dividing module comprises a third voltage dividing unit and a fourth voltage dividing unit. According to the embodiments of the present application, errors caused by fluctuations in the pull-up of the reference power supply can be avoided, and the accuracy of the circuit for detecting insulation resistance can be effectively improved. At the same time, the self-diagnosing of the circuit for detecting insulation resistance is performed, and the insulation resistance detection can be performed when the circuit for detecting insulation resistance works normally, which can further improve the accuracy and reliability of the circuit for detecting insulation resistance.