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How do interference suppression filters work in the extension lead?

 

Extension leads with overvoltage protection and interference suppression filter - Prevent high-frequency interference in electronic equipment

Extension leads with overvoltage protection protect electronic devices against overvoltages and high current peaks in the domestic power supply system, which can occur, for example, as a result of switching operations or indirect lightning. Surge protection is therefore intended to reduce any overvoltages that occur to a level that is harmless to the terminal device.

In addition, faulty or poorly shielded devices can cause visual and acoustic disturbances on screens and in loudspeakers, such as picture flickering, noise or crackling.

Therefore, there are also surge protection extension leads which are additionally equipped with an interference filter. These interference suppression filters prevent the high-frequency interference pulses from the mains from reaching the connected devices and vice versa.

How do interference suppression filters work in the extension lead?

An interference suppression filter reliably suppresses high-frequency interference by using special coils, capacitors and resistors and thus filters or prevents picture and sound interference.

Not every interference suppression filter has the same structure and therefore does not have the same effect. The selection and correct combination of the components is decisive for achieving a good effect of the interference suppression filter. The capacitors and interference suppression coils are particularly important for interference suppression.

Design of an interference suppression filter: