Filtering in Electromagnetic Compatibility (EMC)

Electromagnetic Compatibility (EMC) is crucial for the proper functioning of electronic devices. In today's world, full of radio signals, switched-mode power supplies, and fast interfaces, ensuring that one device does not interfere with the operation of another is a challenge. The filtering process plays a fundamental role in this. It involves eliminating unwanted electromagnetic interference (EMI), both those introduced into the network by devices (emission) and those coming from outside (immunity).

Mains filters: Guardians of clean power

Electromagnetic interference is often transmitted via power lines. Mains filters are used for their effective suppression. Installed at the power input of devices, these filters are designed to cut off the noise propagation paths. They work on a bidirectional principle: they block noise generated by the device itself, which could enter the power grid, and they protect the device against interference coming from outside. The choice of the appropriate mains filter depends on the nominal current, operating voltage, and the required suppression for various frequency bands, both for differential and common-mode interference.

Ferrite cores: Simple and effective solution for high-frequency interference

Another, extremely popular and simple way to combat EMI are ferrite cores. These cores, made of magnetic materials with high loss in the high-frequency range, are mounted on signal or power cables. Their operation involves increasing the cable's impedance for high-frequency interfering currents, which causes them to dissipate as heat. Ferrite cores are effective in suppressing radio noise and high-frequency harmonics that are not easily eliminated by standard mains filters. They are available in various shapes (e.g., rings, snap-ons) and sizes, allowing for their flexible application.

Application and selection of filtering elements

In the DACPOL offer, you will find a wide assortment of filtering elements. From advanced mains filters for panel and enclosure mounting, dedicated to industry and medical devices, to versatile cores. Proper filtering is essential not only for obtaining EMC certification but, above all, for ensuring the long-term and reliable operation of every electronic system. The use of high-quality filters and cores is an investment in the stability and safety of device operation.