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良好接地不如简单隔离？Texas Instruments Incorporated Interface (Data Transmission)
When good grounds turn bad―isolate!
By Thomas Kugelstadt
Senior Applications Engineer
Industrial communication via fieldbus-transceiver systems converting the line voltage into the required DC output.
often requires long transmission lines. Designers, unaware Figure 1 shows a simplified block diagram of a low-cost
of the large ground-potential differences (GPDs) between switched-mode power supply (SMPS) typically used in
remote bus locations, either rely on the local earth ground personal computers, laser printers, and other equipment.
as a reliable signal return path or
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