CM9900R-474

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Common Mode Chokes are electrical devices used to filter out high frequency noise that is present in AC and DC power signals. One such type of Common Mode Choke is the CM9900R-474, a coil-based filter that blocks the noise generated by nearby electrical devices and keeps power supplies clean. It is used extensively in communication and automotive electronics for its low insertion loss and high common mode noise rejection. In this article, we will take a closer look at the CM9900R-474 and discuss its application field and working principle.

Application Field

The CM9900R-474 can be found in many applications such as:

• Automobile Electronics: The CM9900R-474 can be used in automotive electronics to improve electromagnetic compatibility and reduce the chances of malfunctioning due to EMI interference.
• Communication Networks: This filter is used in Ethernet networks to ensure reliable data communication and reduce noise levels.
• Industrial Machinery: The CM9900R-474 is used in various types of industrial machinery such as control systems and automation systems.
• Power Supplies: This filter can be used to reduce noise levels in power supplies as it stops high frequency noise from entering the power source and creating voltage flux.

Working Principle

The CM9900R-474 is a coil-based filter that works on the principle of inductive reactance. This filter consists of two types of components, the core and the windings. The core, made of ferrite material, is designed to provide a high degree of inductive reactance, which helps resist the flow of noise while allowing the desired signal to pass through. The windings, made of copper, are wrapped around the core to provide a low-impedance path for the desired signal. The combination of these two components gives the filter its high common mode noise resistance and low insertion loss.

The filter works by creating an opposing magnetic field to the noise signal that is present in the power. This opposing field blocks the noise from entering the power supply and allows the desired signal to pass through uninterrupted. The filter also works by creating a time-varying inductance that further improves the noise cancellation capabilities of the filter. As the frequency of the noise signal changes, the inductance of the filter will also change to provide optimal noise resistance.

Conclusion

The CM9900R-474 is a coil-based filter that offers excellent common mode noise rejection and low insertion loss. It is used in a variety of applications such as automotive electronics, communication networks, industrial machinery, and power supplies. The filter works on the principle of inductive reactance, creating an opposing magnetic field to the noise signal and creating a time-varying inductance for optimum noise resistance. It is an important device for reducing EMI interference and improving the performance of electronic devices.

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