PWM type active high-voltage interlocking detection system and method

A PWM type active high-voltage interlocking detection system disclosed by the present invention comprises a high-voltage interlocking detection circuit and a control terminal which are in communication connection, and the high-voltage interlocking detection circuit comprises a constant current source switch circuit which is electrically connected with a high-voltage interlocking input end, receives a PWM signal and inputs a constant current to the high-voltage interlocking input end, the contact resistance acquisition circuit is electrically connected with the high-voltage interlocking output end, and the first acquisition branch is used for acquiring a trigger signal generated by a PWM signal; the second acquisition branch is used for acquiring the sampling voltage output by the second acquisition branch; a PWM rising edge acquisition module of the control terminal acquires a trigger signal acquired by a first acquisition branch, and an ADC acquisition module acquires a sampling voltage output by a second ac