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Origin Of EMI Filters
Dec 20, 2018

The power cord is the main way to interfere with incoming and outgoing devices, through the power cord, the interference of the power grid can be passed into the equipment, interference with the normal operation of the equipment, the same equipment caused by the interference may also be transmitted to the power grid through the power cord, interfering with the normal work of other equipment.

Reason The EMI filter must be added to the power inlet of the device.