FE2X39-3-3NL

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Common Mode Chokes

The FE2X39-3-3NL is a common mode choke (CMC) which is used in a variety of applications. CMCs work by providing a low-impedance path for common-mode currents while providing a high-impedance path to differential-mode currents.

Application Field

Common mode chokes are commonly used in industrial applications, such as motor drive systems and power electronics circuits. They are also used in audio systems as well as communications networks. CMCs are typically used in applications where high-frequency signals are present, as they are able to better filter out these high-frequency signals than a regular inductor. CMCs can also be used to reduce the amount of conducted EMI in control circuits.

Working Principle

By taking the advantages of its two winding sections, a CMC is able to provide two leakage paths for both differential and common mode interference. The leakage paths of a CMC are composed of the leakage inductance and capacitor, as well as the series inductance with its turn ratio between the two sections of the CMC. The ratio of the turns between the two windings determines the amount of common and differential mode current that is allowed to pass.

The insertion loss of a CMC is determined by the inductance and the parasitic capacitance of the two winding sections. The higher the leakage inductance and the lower the parasitic capacitance, the better the performance of the choke. As such, high-frequency signals can be more effectively filtered out.

Conclusion

The FE2X39-3-3NL is an example of a common mode choke which is used in a variety of applications. CMCs offer excellent high-frequency interference rejection, which makes them ideal for a variety of applications. The working principle of a CMC relies on the use of two winding sections, and by adjusting the turn ratio between the windings, the amount of common and differential mode current that is allowed to pass can be controlled. Furthermore, the insertion loss of a CMC can be further improved by increasing the leakage inductance and reducing the parasitic capacitance.

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