EMI filter circuit part --- After the mains power enters the power supply, it first passes through the first-level EMI filter circuit part. The main function of EMI filtering is to filter out the interference of high frequency pulses from the external power grid to the power supply, and to reduce switching The electromagnetic interference of the power supply itself to the outside world.
In fact, it is good for the characteristics of inductance and capacitance, so that the alternating current with a frequency of about 50 Hz can pass through the filter smoothly, and the high frequency interference and clutter above 50 Hz will be filtered out by the filter.
