744224 Filters

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Common Mode Chokes, sometimes referred to as linear filters, are a type of electronic component used in power supplies and other electrical circuits to reduce electromagnetic interference (EMI). They work by filtering out large high frequency signals and allowing only small, lower frequency ones to pass through. Common mode chokes are also used to provide a ground-level reference for other components in the circuit.

Common mode chokes work on the principle of impedance matching and inductive reactance. Impedance is the resistance to alternating current, while inductive reactance is the opposition to current changes caused by a magnetic field. Common mode chokes essentially act as an impedance match between the input and output signals. The small, low frequency signals pass through the choke easily, while the large, high frequency signals encounter a great deal of resistance, thus preventing their passage. The choke also performs a grounding function, which is essential for reducing EMI.

Common mode chokes are found in numerous applications, both commercial and consumer. They are commonly used in consumer electronics, such as televisions, DVD players, game consoles, and computers. Common mode chokes also have a wide range of industrial and commercial applications, including medical imaging and diagnostic equipment, power supplies, radio transmitter circuits, and automotive electronics.

Common mode chokes are available in a variety of sizes, materials, and configurations. The most common type consists of an inner core of powdered iron or iron oxide and an outer coil of copper wire. The inner core absorbs and stores the high frequency signals, while the outer coil dissipates them. The core is protected by an outer shell of epoxy or plastic, which keeps the core from being damaged by moisture or other contaminants. Other varieties of common mode chokes include ferrite beads, axial-mode helical chokes, and multi-layer common mode chokes.

The manufacturing process for common mode chokes is typically a relatively simple one. The core material is typically mixed with an epoxy or plastic and heated to form the inner core. The outer coil is then wound around the core. The wound chuck is then placed in a shell and cured under pressure to ensure the winding is properly sealed. Finally, the shell is sealed with additional epoxy to provide additional protection.

Common mode chokes are widely used to reduce electromagnetic interference and improve reliability in a variety of electronic circuits. They allow only small, lower frequency signals to pass through, while absorbing and storing high frequency signals which could interfere with the circuit. The wide range of applications and sizes ensures that there is a common mode choke to fit virtually any application or design.

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