Where is the optimal installation location for the magnetic ring of an electric FTU?

The installation location of the ferrite core affects the high-frequency interference suppression effect. The optimal installation locations are: a nickel-zinc ferrite core (μ300), 10mm inner diameter, 5 turns, at the power input, suppressing interference from 30MHz to 300MHz. A ferrite core (μ2500), 6mm inner diameter, 3 turns, at the communication cable input, suppressing interference from 10MHz to 100MHz. A PBZ1608E600Z0T (600Ω@100MHz) chip bead is installed near the interference source on the signal line. During installation, the ferrite core should be as close to the interference source as possible, and the cable should be tightly wound on the ferrite core without gaps. On the PCB, the ferrite bead should be placed close to the IC power pin. Through optimized installation, high-frequency radiated interference is reduced by more than 15dB, conducted emissions meet the EN55032 Class B limits, and the radiated immunity test passes the IEC 61000-4-3 test.