7442335900 Filters

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Common Mode Chokes

Common mode chokes, also known as line filters or flicker filters, are widely used in electrical control systems. They are commonly used to reduce the occurrence of common mode interference, which can occur when two or more conductors are subject to the same external electromagnetic disturbances. The 7442335900 application field and working principle of common mode chokes is detailed below.

Application Field

Common mode chokes are frequently used in numerous types of power, signal, and communication circuits to reduce electromagnetic interference (EMI). EMI is caused when electrical noise, generated by other electrical components, is picked up by the line. Common mode chokes are specifically effective in situations where there are two or more conductors that are subject to the same external interference. A common example of such a situation is the interference caused by power cables near communication cables. When the current flows through the power cables and external EMI is present, the current will cause the EMI to be coupled on the communication cables as well. Common mode chokes act to reduce this interference.

Working Principle

Common mode chokes are based on the principle of "electromagnetic induction". This means that a voltage is induced in a conductor that moves through a magnetic field. The principle of inductance states that the amount of induced voltage is directly proportional to the rate of change of the magnetic field strength. As the current flows through the common mode choke, the inductance of the element causes the current to decrease, resulting in the impedance of the common mode choke increasing. This impedance forms a barrier to any further current flow, thereby reducing common mode interference.

The inductance of a common mode choke is known as the "inductance factor". This factor can be adjusted by changing the number of windings in the element. The more windings, the greater the inductance factor. This factor can also be increased by adding additional core material to the element. The amount of core material will depend on the application and environmental conditions.

What is unique about common mode chokes is that the effect of the element is not based solely on resistance, as with other types of inductors. This is because the magnetic field creates a barrier that not only blocks the passage of current but also reduces the level of interference that is caused by the current. The greater the inductance factor, the higher the current impedance, and the lower the interference.

Conclusion

Common mode chokes are widely used in electrical control systems. Their main purpose is to reduce the occurrence of common mode interference, which can occur when two or more conductors are subject to the same external electromagnetic disturbances. The 7442335900 application field and working principle of common mode chokes utilizes the inductance of the element to form a barrier to any further current flow, thereby reducing common mode interference and allowing the system to operate at optimal levels.

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