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Common mode chokes, also known as common mode filters, are high impedance electromagnetic devices designed to reject common mode interference in two-wire systems. Common mode chokes, also known as common mode filters, are used as part of EMI/RFI attenuation filters to reduce the intensity of interference signals that are common to both power and signal lines. Common mode chokes are used in a wide range of applications, from power line communications to aerospace, and are essential components for many motor control, semiconductor, and telecommunications systems.

Common mode chokes are composed of two inductors connected together in series. The inductors are wound on either a printed circuit board, a core, or in some cases both. The inductance of the chokes blocks signals in the high frequency range, while the low frequency signals are allowed to pass through. The two inductors are connected in series so that the current that travels through one inductor is equal to the current that flows through the other.

The inductance of the chokes can be adjusted by changing the number of turns on the coil or the size of the core. This allows the manufacturer to control the amount of current flowing through the coils and thus reduce the amount of radiation that is emitted. The inductance can also be adjusted by using different materials for the core, such as ferrite, beryllium copper, ferrite-mica, or etching copper onto the substrate.

Common mode chokes can be used in applications such as EMI/RFI filtering, surge suppression, limiting noise and ground current leakage, and controlling EMI radiation in the frequency range of 150MHz to 10GHz. Common mode chokes are used in automotive systems, commercial and residential power systems, communication systems, and in industrial applications. They provide an effective solution to reduce EMI/RFI interference in complex system designs.

Common mode chokes are used to reduce electromagnetic interference (EMI) in many applications such as medical sensors, guidance systems, automotive navigation systems, industrial control systems, power systems and computers. The chokes are used to reduce EMI from external sources such as power lines, electromagnetic interference from other electronics, and other sources of interference. The reduction of EMI is essential in many systems for reliable operation.

Common mode chokes work by providing a electromagnetic field with a certain impedance across the entire frequency spectrum, which provides an efficient and cost-effective solution to EMI mitigation. They can be designed in a variety of shapes, sizes, and styles to meet the needs of different applications. Common mode chokes can range in size from small components integrated in other devices, to large chokes weighing several hundred pounds.

Common mode chokes provide a reliable and cost-effective solution to EMI/RFI interference in circuits. The inductors block high frequency interference while allowing low frequency signals to pass unhindered. They can be used in a variety of applications, from power line communications to aerospace, providing an efficient solution to reduce EMI radiation and improve signal integrity.

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