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How to isolate the communication ground and power ground of an intelligent low-voltage monitoring unit?

Time：2026-01-02 Views：521次

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Communication ground and power ground are isolated to prevent high-current noise interference.

A single-point connection using a ferrite bead is employed: the two ground planes are connected via a PBZ1608E600Z0T ferrite bead (600Ω@100MHz).

The communication interface uses an isolation scheme: the RS485 uses an ADM2483 isolated transceiver (2.5kVrms).

PCB design: the two ground planes are separated with a 1.5mm spacing; cross-zone signals use an optocoupler TLP281.

This isolation reduces ground noise coupling by 35dB, and the communication bit error rate is less than 10^-6.

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