How to adapt concentrators to complex power grid environments and EMC?

The concentrator operates in a complex power grid environment, facing voltage fluctuations, abundant harmonics, frequent load switching, and strong electromagnetic interference. Its EMC design must be specifically adapted to these conditions. At the power input, a wide-range input (e.g., 85-265VAC) switching power supply should be used, with enhanced filtering: the common-mode inductor CMZ1211-501T inductance needs to be increased (e.g., 1mH), and the Y capacitor capacitance should be appropriately increased (e.g., 4.7nF). Protection levels should be improved: surge protection must meet IEC 61000-4-5 Class 4 (common-mode 4kV, differential-mode 2kV), using a combination of varistors (e.g., 14D511K) and gas discharge tubes. For power grid harmonics, the cutoff frequency of the anti-aliasing filter at the front end of the sampling circuit needs to be set appropriately. The communication interface must be isolated and use shielded twisted-pair cable. The chassis shielding requirements are higher. Software should include power grid disturbance identification and fault tolerance handling. The concentrator should pass rigorous industrial environment EMC testing.