CMF-0220

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Common mode chokes (CMF) are an essential part of many devices today, playing an essential role in reducing radio frequency interference and voltage spikes. A CMF-0220 is a common mode choke designed for specific applications and operates through the principle of inductive interference cancellation to reduce interference in circuits and systems.

The Application Field

The CMF-0220 is a high performance common mode current filter with a wide operating frequency range of 10 kHz to 150 kHz. It is ideal for use in electronic systems that require noise reduction and power line multiphase noise reduction, including high end industrial equipment, medical imaging equipment, FPGA systems, power supplies, and more. The CMF-0220 is available in two versions, a shielded version for a high current system and a non-shielded version for low current systems.

Working Principle

The CMF-0220 uses inductive interference cancellation to reduce noise in power lines. The choke works by creating a magnetic field in the vicinity of the power line, which inhibits the high-frequency current from passing through the line and thus reduces the overall noise. The choke also contains two windings, a primary winding and a secondary winding, which are designed to filter out the common mode noise and allow the wanted signal to pass through.

The two windings of the CMF-0220 are wound in opposite directions to induce a current flow which cancels out the common mode noise. This is achieved by the magnetic fields generated in the windings which are out of phase with each other - the incoming current is weakened at each turn, thus reducing the overall noise level. Additionally, the two windings also serve to reduce the leakage inductance and further reduce the EMI generated in the system.

Conclusion

The CMF-0220 is a common mode choke designed for specific applications. It works through the principle of inductive interference cancellation, creating two windings out of phase with each other to reduce the common mode noise. This is an effective way to reduce the interference in circuits and systems, particularly high end industrial equipment, medical imaging equipment, FPGA systems, and power supplies.

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