Designing filters however requires complex and time consuming calculations unless you use the powerbench filter design tool the filter design tool makes the design of filters to eliminate emi easy all you need to do is select the frequency you need to suppress and the amount of attenuation you require and the tool does the rest. Essentially an ac power or mains emi filter is a low pass filter that blocks the flow of noise while passing the desired input 50 60 400 hertz power frequency an ideal emi filter will reduce the amplitude of all frequency signals greater than the filter cut off frequency. Emi filter design nearly all power circuits contain an input electromagnetic interference emi filter the main purpose of the emi filter is to limit the inter ference that is conducted or radiated from the power circuit excessive conducted or radiated interference can cause erratic behavior in other. Emc filter design the emc filter design is critical to the electromagnetic compatibility emc performance the emc filter must be capable of providing the required level of attenuation of the unwanted signals while allowing through the wanted signals in addition to this the emc filter design must match both the source and load impedances. How to design an emi filter electrical and electronic circuits are constantly bombarded with electromagnetic interference emi a simple example of emi is when someone plugs in a household appliance such as a vacuum cleaner and upon turning it on noise is picked up by a nearby radio receiver emi filters are used
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