Electromagnetic coupled digital output circuit with output feedback

The invention relates to a digital system digital output circuit for isolating system side from output side by electromagnetic coupler, mainly comprising system side drive circuit, electromagnetic coupler and output side control circuit, where the electromagnetic coupler at least has system side sensing element, output side first sensing element, and output side second sensing element; the system side drive circuit is connected with the system side sensing element to receive ON/OFF multi-word control signal of a multi-word system to switch on or off drive of the system side sensing element; the electromagnetic coupling function of the electromagnetic coupler converts and transmits system side driving energy to the output side first sensing element, providing working energy for the output side control circuit; the output side second sensing element feeds back the output side electric appliance state to the system side through the electromagnetic coupling function.