brief introduction： Choke coil is a ferrite core of common-mode interference suppression devices, it is made up of two same size, same number of turns of the coil symmetrically on the same ferrite ring core, forming a four terminal device, as shown in figure 15 e, to the common mode signal present a large inductance with inhibition, and for the differential mode signal present a little small leakage inductance. Choke coils can effectively suppress common-mode interference signals (such as lightning interference) in

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