A Brief Introduction to the Common Mode Choke

                            A Brief Introduction to the Common Mode Choke

A choke is a power magnetics component which is used in electronic circuits. It is an inductor that is utilized to block high-frequency, alternating current (AC) in a circuit while allowing lower frequencies, or direct current (DC), through. The choke normally consists of insulated wire that is wound around a magnetic core.

The name isn't something that just came out of nowhere—choking refers to blocking high frequencies while allowing lower frequencies. If a device is being used for blocking then it is referred to as a choke. However, if the device is used in filters or LC circuits, it is referred to simply as an inductor.

There are two different types of chokes: audio frequency chokes (AFC) and radio frequency chokes (RFC). AFCs are engineered to specifically block audio and power line frequencies while allowing DC to pass through. On the other hand, RFCs are engineered to block only radio frequencies while allowing DC and audio to pass through.

Common mode chokes are useful for the prevention of electromagnetic interference (EMI) and radio frequency interface (RFI) from power supply lines and for preventing electronic equipment from malfunctioning.

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