1.8 A EMI Mains Filters 3

EMI mains filters are electronic filters that are used to suppress electromagnetic interference (EMI) from mains power lines. They are designed to provide a high level of attenuation of unwanted frequencies while allowing the desired power signal to pass through with minimal distortion.

EMI mains filters use a combination of passive and active components, including capacitors, inductors, resistors, and diodes, to filter out noise and interference from power lines. They can be designed for a wide range of power ratings and frequencies, depending on the application.

EMI mains filters can be designed as low-pass filters, which allow low-frequency power signals to pass through while attenuating high-frequency EMI signals, or as band-stop filters, which block a specific range of frequencies while allowing other frequencies to pass through. They can also be designed with multiple stages of filtering to provide increased attenuation of unwanted frequencies.

EMI mains filters are commonly used in a variety of electronic systems, including power supplies, motor drives, medical equipment, and industrial control systems. They are also used in residential and commercial buildings to suppress EMI noise from power lines and prevent interference with other electronic devices.