744235900 Filters

Common mode chokes are a type of filter that is designed to reduce noise or interference impairing signals in alternating current (AC) circuits. Common mode chokes are also known as ground loop isolators, line noise chokes, ground fault isolators, or differential mode chokes. The "Common Mode Choke" designation is generally used to describe a device that consists of two or more inductor elements. It is designed to block the flow of high-frequency signals while still allowing low-frequency signals to pass through.

When AC power is introduced into a circuit, it creates electrical fields in both the common mode and differential mode. When high-frequency signals are introduced, they can interact with the currents in the common mode, introducing noise or distortion to the overall signal. Common mode chokes act by blocking these interfering signals while still allowing low-frequency signals to pass through. They are usually used in power supplies, data lines, and sensitive applications including medical equipment.

The main application field of Common Mode Chokes lies in Industrial Applications. Common mode chokes are used to block interference that is emitted from various industrial processes. The chokes are primarily used to reduce the noise from power lines and devices operating on the same ground potential. These chokes create an impedance that prevents interference from propagating through the ground line. In industrial processes, this can help reduce interference from high power electric motor systems and other sources of power.

The working principle of Common Mode Chokes involves the creation of a balanced magnetic field between two inductor elements. A Common Mode Choke is built with two coils or inductors which are wound in an opposite direction. The two coils are placed on the same axis creating a balanced magnetic field. This magnetic field creates an impedance between the two coils which inhibits the flow of high-frequency signals. This insulation helps to ensure that only low-frequency signals are allowed to pass through the device, eliminating interference.

Common Mode Chokes can be used in a variety of applications to filter out high-frequency signals that may cause interference. They are used in power supplies, data lines, and sensitive applications such as medical equipment. The balanced magnetic filed they create ensures that only low-frequency signals can pass through while the high-frequency signals are blocked. This helps to ensure clean signal transmission and more reliable operation.