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How can the isolation devices of an intelligent low-voltage monitoring unit improve its immunity to disturbances?

Time：2026-01-28 Views：523次

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Isolation devices improve immunity by breaking ground loops and suppressing common-mode interference.

High isolation voltage devices are selected: ADUM1410 (3kVrms) for digital isolation, ISO7240C (3kVrms) for analog isolation, and WRB2405S-3W (1.5kVDC) for power isolation.

Layout: Isolation devices are connected across the split ground planes.

Filtering: RC filters are added before and after isolation.

Through isolation, the common-mode transient rejection capability (CMTI) is greater than 25kV/μs, and the system immunity is improved by 25dB.

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