3. Filter structures

The primary purpose of a filter is to attenuate disturbances generated by electronic equipment. The idea is to create an impedance break. Indeed, if input and output impedances are low, the aim is to obtain a high impedance filter to effectively filter the system, and vice versa for high input and output impedances. Typically, inductors and common-mode cores (CMTs) are of high impedance, while capacitors are of low impedance (depending on the frequency range).

Depending on the type of disturbance, filtering must be oriented either towards the differential mode, the common mode or both. The structures presented in this section can be used alone or in combination to act on the 2 modes simultaneously.

The filter structure must be chosen according to the desired attenuation and the source and load impedances. The more cascaded filter cells there...

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Filter structures

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page The main property of a filter: its attenuation

Modeling passive components

Bibliography

(1) - DURAND (P.), LEMAN (S.), MAURICE (O.), RAVELO (B.), REINEIX (A.), SOHOR (Y.), STOJANOVIC (M.) - Application de la méthode de Kron à la résolution de problèmes de CEM : exercices corrigés. - Bookelis (2017).
(2) - LAFON (F.) - Développement de...

The book [1], which presents various applications of Kron's method to EMC problems, includes two chapters dedicated to the study of filters against electromagnetic interference. It provides a comprehensive overview of how to calculate attenuation, bearing in mind that there are an infinite number of possible structures. In fact, filters are designed according to need, and can therefore be very different from one another depending...