How to reduce crosstalk in wiring between PMS (Power Measurement System) modules?

Different functional modules within a PMS (such as power modules, control boards, and metering boards) are interconnected via connectors or cables, and these interconnections can become crosstalk channels. Reducing crosstalk between modules requires addressing the interface circuitry, connectors, and cables. On the interface circuitry, a small resistor (22-100Ω) or a ferrite bead (PBZ1005B-501Z0T) should be connected in series with each interconnect signal line to mitigate edge interference and absorb reflections. For parallel buses, grounding wires (GND) can be inserted between signal groups for isolation.

Connectors with shielded housings should be preferred, and the shields should be securely connected to the chassis or ground plane of both modules. Interconnect cables should use twisted-pair cables (for differential signals) or shielded cables, with the shield connected to the chassis at both ends or at least one end (depending on the grounding strategy). During layout, avoid placing high-frequency noise lines (such as PWM) and sensitive analog lines (such as sampling signals) in the same wiring harness or on adjacent pins of connectors. By implementing these measures, the crosstalk voltage generated by interconnecting modules can be reduced to below 50mV, ensuring independent and stable operation of the modules and meeting the overall EMC performance standards of the system.