INSULATION RESISTANCE DETECTION CIRCUIT, METHOD AND DEVICE AND STORAGE MEDIUM THEREOF

This application provides an insulation resistor detection circuit, method, and apparatus, and a storage medium thereof, to detect whether an insulation resistor is faulty. The insulation resistor detection circuit includes a state control unit, a first voltage division branch, a second voltage division branch, and a processor. The state control unit is connected between a positive electrode and a negative electrode of a power supply of a to-be-detected apparatus. The first voltage division branch is connected in parallel to a first capacitor to obtain a first voltage waveform, and the second voltage division branch is connected in parallel to a second capacitor to obtain a second voltage waveform. The processor is connected to the state control unit, the first voltage division branch, and the second voltage division branch; calculates, based on the first voltage waveform and the second voltage waveform that are at a current moment, voltage feature values of the first capacitor at different moments in specified duration before the current moment and voltage feature values of the second capacitor at different moments; determines a next switching moment based on the voltage feature values of the first capacitor at the different moments and/or the voltage feature values of the second capacitor at the different moments; and control, at the next switching moment, the state control unit to switch a state.