How does the common mode inductance in industrial PLC equipment cope with the requirement of wide voltage input (85-265VAC)?

Optimization of magnetic core material: Utilize ferrite (such as PC40) or nanocrystalline magnetic cores with high saturation magnetic induction intensity (Bs≥500mT) to prevent magnetic core saturation at low input voltages of 85V. Winding design: Segmented winding: Divide the winding into multiple segments to reduce interlayer voltage stress and enhance voltage resistance (for example, the insulation level needs to reach Class B when inputting 265VAC). Wire diameter calculation: Adjust the cross-sectional area of the conductor based on the input voltage range to ensure that the winding temperature rise is ≤40K at 265VAC. Dynamic compensation: Parallel RC snubber circuits (such as 100Ω/0.1μF) are used to suppress transient spike interference during wide voltage switching.