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How to reduce EMI in the control output circuit of an intelligent low-voltage monitoring unit?

Time：2026-01-10 Views：511次

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EMI reduction in the control output circuit employs relay protection and filtering. A 1N4007W freewheeling diode and a 470Ω/1W resistor are connected in parallel across the relay coil. A PBZ2012E600Z0T ferrite bead (600Ω@100MHz) is connected in series on the output line. PCB layout: The control output circuit is kept away from sensitive circuits. The control section inside the chassis is partially shielded. This reduces control output EMI by more than 30dB, with less than 0.1% impact on the monitoring circuit.

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