| 摘要 |
A galvanic isolated digital output circuit of a digital system is provided herein, which utilizes an electromagnetic coupling device for galvanically isolating the system side and the output side of the digital output circuit. The digital output circuit contains a system-side driving circuit, an electromagnetic coupling device, and an output-side control circuit. The electromagnetic coupling device contains at least a system-side electromagnetic coupling element, a first output-side electromagnetic coupling element, and a second output-side electromagnetic coupling element. The system-side driving circuit is connected to the system-side electromagnetic coupling element, and takes the ON/OFF digital control signals from the digital system as input to turn on and off its driving to the system-side electromagnetic coupling element. The electromagnetic coupling device converts and transmits the electrical energy from the system side to the output side and thereby provides the working energy to and required by the output control circuit connected to the first output-side electromagnetic coupling element. The second output-side electromagnetic coupling element forms a feedback circuit, through which the electrical status at the output side is fed back to the system side via the electromagnetic coupling device.
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