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How do Ferrite Core Works


Ferrite core is widely used component in electronic circuit. Working principle of ferrite core or ferrite bead will clear its importance in a circuit.

How do Ferrite Core Works?

• Ferrite suppress noise without ground. It didn’t discharge the noise to the ground.

• When a wire pass through a ferrite core, it generates magnetic field.

• This magnetic field concentrate inside the ferrite core, and produce magnetic flux in the core.

• This magnetic energy is converted to the heat and it becomes magnetic loss of ferrite.

• Hence, noise is removed from the signal.

See below image to understand ferrite working;

Working of Ferrite
How a Ferrite Works

Placing a ferrite on both Signal and Ground

• We can place ferrite core on both signal and ground.

• Common mode noise is in same direction so they don’t cancel each other. They are converted in magnetic flux and then to heat.

• Differential mode noise goes in through signal line and return back through ground line and hence cancels each other i.e. the current in the wire opposing to each other.

How do ferrite core works
Placing a ferrite on both Signal and Ground

Placement of an individual ferrite on Signal and individual ferrite on Ground

• Here an individual ferrite is placed on the signal and an individual ferrite on ground.

• Common mode noise is in same direction so they don’t cancel each other. They are converted in magnetic flux and then to heat.

• In differential mode, this attachment is effective because the currents do not cancel each other. Noise is converted to magnetic flux and then to heat.

• Here as in differential mode no current cancels and if large current comes, then core will go in saturation.

How do ferrite core works
Placement of a individual ferrite on Signal and individual ferrite on Ground

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Conclusion

Ferrite plays important role in noise suppression. While designing a circuit, working principle of ferrite will help in proper selection of ferrite and also help in its proper placement in the circuit.

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