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Common Mode Chokes

Introduction

Common Mode Chokes, also known as EMI (Electromagnetic Interference) filters or line-to-ground filters, are widely used in electronic circuits and systems as noise suppressors. They function by suppressing the flow of common-mode noise, which is generated by each transmission line in the circuit, wired together and then filtered through the line-to-ground filter, thereby eliminating any interference that would otherwise affect the signal on the line and introducing radio frequency (RF) noise into the system.

CMT-8119-B Application Field and Working Principle

Application Field

The CMT-8119-B Common Mode Choke is commonly used in power supplies, instrumentation, communications equipment, medical equipment, and in other general-purpose applications. It is also widely used in industrial and automotive applications as a means of suppressing high-frequency noise that can interfere with operations or cause damage to other connected components. It is commonly used in Ethernet, DSL/ADSL, and other technologies that rely on permissive emissions and noise suppression.

Working Principle

The CMT-8119-B choke relies on the principle of inductive coupling between the unbalanced line and the line-to-ground filter. This inductive coupling inhibits the passage of common-mode currents through the filter, reducing the amount of transmitted interference. As common-mode currents flow through the inductive element, a magnetic field is generated which opposes the flow of these common-mode currents. The magnitude of the generated magnetic field is dependent on the magnitude of the line current, the impedance of the line, and the inductance of the filter element.

The CMT-8119-B filter is designed with an impedance of 8–10 ohms and an inductance of 5–10 microHenries, and it is capable of filtering out any common-mode noise that is present on the line. The filter is also able to absorb noise before it is radiated out, preventing it from potentially interfering with other equipment connected to the line.

Conclusion

The CMT-8119-B is a common mode choke designed for use in reducing electromagnetic interference on power lines, instrumentation, communications equipment, medical equipment, and other applications. It is designed with an impedance of 8–10 ohms and an inductance of 5–10 microHenries, and relies on the principle of inductive coupling between the unbalanced line and the filter line-to-ground, so that it can prevent any common-mode currents from passing through the filter. By blocking out this noise, it is possible to reduce the amount of interference that is generated and transmitted, allowing for more efficient and reliable operation of the connected equipment.

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