B82789C113H1

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Common mode chokes are passive components used for suppressing common mode noise, mainly used in applications where high voltage, high frequency alternating field signals are produced. Models like the Siemens B82789C113H1 are widely used.

B82789C113H1 is a high-power common mode choke with a rated impedance of 50Ohm. It is designed to reduce high frequency common mode and differential mode noise of small amplitudes. The product is composed of two wirewound inductors over a ferrite core. The main application fields of this product are for the protection of sensitive electronic devices, and for the protection of AC power lines against interference. Typical applications include interference immunity in automobiles, in telecom, in audio/video and other electronics, as well as power line protection.

The working principle of a common mode choke is magnetic coupling between two windings. An electric current can run freely through both windings separately, but the common mode component is stopped. The windings of a common mode choke act as a balanced signal transformer with common mode noise transferred by mutual inductance. The common mode choke will reject a differential mode transmission, which is an inherent characteristic.

Due to the external magnetic field generated by the transformer system inside of the common mode choke, a small but significant attenuation can be achieved, limiting the impedance of common mode noise. The amplitude of the unwanted common mode noise will decrease, reducing its impact on electrostatic noise generated in the equipment connected to the power line.

At higher frequencies, a common mode choke is able to suppress common mode noise because of its impedance changes. The two windings act as an inductance, blocking the common mode noise, and lowering the voltage across the ground wire connected to the power source. By blocking the common mode noise, the transmission of power remains at the desired level while the equipment connected to the power source remains safe.

For a common mode choke, the capacitance between the two windings might reduce the attenuation efficiency at high frequency. Therefore, the design must be carefully done in order to attenuate the highest frequency noise.

In summary, a Siemens B82789C113H1 is a high-power common mode choke with a rated impedance of 50Ohm, composed of two wirewound inductors over a ferrite core. It is primarily used to reduce high frequency common mode and differential mode noise of small amplitudes in power lines, and is a popular choice for the protection of AC power lines against interference. Its working principle is based on magnetic coupling between two windings, which act as an inductance, blocking the common mode noise.

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