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 ……