How Emi Emc Filters Affects the Electric Circuits

Electromagnetic interface (EMI) is the disturbance that affects a circuit due to electromagnetic induction or radiation that is produced from external source. It is also known as RFI that is Radio Frequency Interface. It is also used to suppress the conducted interface that is generated by any equipment or circuit. It also causes malfunctions of equipment.

There are many forms of electromagnetic interference, EMI that can affect circuits and prevent them from working in the way that was intended. EMI - electromagnetic interference can arise from many sources, being either man made or natural. It can also have a variety of characteristics dependent upon its source and the nature of the mechanism giving rise to the interference.

All electronic equipment produced today includes EMI filtering circuits. Likewise, all switch-mode power supplies have internal EMI filters. However, there are circumstances where the EMI filters within these electronic devices require a supplemental filter to meet more stringent electrical noise regulations or to protect the device from excessive external noise sources.

Electromagnetic compatibility is a near perfect state in which a device or system functions satisfactory in the electromagnetic environment, without producing disturbance in the Electromagnetic interface.

Effects of Emi Filters:

·         Disturbance in radio and TV due to operation of blinder, shaver or a moving vehicle.

·         Formatting of data or resetting of computer.

·         Malfunctioning of Flight Controlling System due to use of mobile phones or laptop.

·         Biological hazards

·         Failure of pace maker due to use of Walkie-Talkie.

Sources of Emi Filters

·         Refrigerator, washing machines

·         Electric shavers, blinders, mixer grinder

·         Power supply cords of computers or laptops

·         Military equipments

·         Fast switching digital devices.

·         Laboratory Equipments

·         Overhead Cranes

·         Energy Management Systems

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