Initiating explosive device link detection circuit and method based on constant current source

The invention relates to an initiating explosive device link detection circuit and method based on a constant current source, and belongs to the field of initiating explosive devices. A single-chip microcomputer MCU controls GP8302 to generate a 5mA constant current source, 5mA constant current flows through a fixed-value resistor, passes through a normally closed point of a relay and then is sampled and reported to the single-chip microcomputer, and a sampling value 1 is recorded; the single-chip microcomputer outputs control IO to the relay, the normally open contact of the relay is controlled to be closed, the normally closed contact of the relay is controlled to be disconnected, the initiating explosive device is introduced into a measuring circuit, 5mA constant current flows through a fixed-value resistor and is sampled by the initiating explosive device and then reported to the single-chip microcomputer, and a sampling value 2 is recorded; if the voltage sampling value is 0 and the ALARM pin is low in t