Ferrite Core for High Frequency Power Supply and Communication Markets

EMI Ferrite / Ferrite Core - KITAGAWA INDUSTRIES America, Inc.

If you need a low-cost, easy-to-install filter for your power connection, ferrite cores are your best friends. But, what can I achieve by inserting a ferrite core inside a wire? That’s a good question folks, and the answer is that you’ll achieve the noise filtering of power cord signals. 

When using ferrite cores to filter out noise in cables, no other parts of the circuit are required, saving time and money. Awesome, right? 

The good news is that ferrite cores don’t necessitate any sort of mechanical retooling either. You can increase the quality of the signal that is traveling through a cable by using something as basic as a ferrite core. You can take a peek at this link if you’re curious to know more about the topic https://www.allaboutcircuits.com/tech-chats/ferrite-cores-with-distributed-air-gaps-tdk-electronics-and-tech-chats/

Have we tickled your fancy so far? If so, then let’s go deeper into the definition, uses, and properties of ferrite cores.

What exactly is a ferrate core? 

Ah, the million-dollar question, folks. You should know that ferrate cores are pretty much ceramic compounds that have permanent magnetic properties. 

But, how are they made? 

Well, ferric oxide is combined with either magnesium-zinc or nickel-zinc oxides to create the ceramics used to construct ferrite cores. In order to create the necessary core forms, you should know that the mixture is first compressed and then extruded.

Let’s see, what else? Oh, it’s possible to construct ferrite cores from many different materials. The shape of the ferrite core is also a significant factor to think about because of the variety of ferrite materials. When ferrite cores are used as EMI filters, the package design also plays a significant role.

Also, the most typical ferrite core for reducing interference from electromagnetic fields is a cylinder shape. Power decoupling and filtering are both accomplished by simply wrapping a cylinder of ferrite core around a cable. The material and geometry choices make a significant difference in how a ferrite core performs. The ferrite impedance parameter is sensitive to both material and shape variations.

What to understand about ferrite impedance?

All Ferrite Beads Are Not Created Equal - Understanding the Importance of Ferrite  Bead Material Behavior - In Compliance Magazine

When developing ferrite cores, it is crucial to take into account the ferrite’s impedance. Material properties, temperature, core size and shape, and operating frequency all play a role in how the ferrite’s impedance is affected.

You should also be aware that a ferrite core’s efficiency grows as its operating frequency rises. Since ferrite cores are mostly inductive at low frequencies, they can be used as low-pass LC filters. The ferrite core’s inductive reactance decreases, and it becomes resistant as the frequency rises. A ferrite core acts like a resistor at high frequencies, making it ideally suited for use in noise-canceling applications.

But, how do they suppress noise?

Ferrite cores have a low-quality factor and minimal resonance problems at high frequencies. A one-turn coil inductor is created when a ferrite coil is put into a conductor. 

Moreover, magnetic flux is generated within the ferrite core as a result of current flowing through the coil inductor. In the center, the electric power is transformed into magnetic flux. As the electric current in the wire fluctuates, so does the magnetic flux associated with the coil. 

Oh, and you should also know that in accordance with Faraday’s law of electromagnetic induction, magnetic energy is converted to electrical energy whenever there’s pretty much a change in current. Hysteresis losses are magnetic losses that occur during the transformation to electrical energy.

The current via a conductor or cable experiences magnetic losses, which cancel out a portion of the noise in the current. The ferrite core considerably aids in the reduction of EMI or noise in the cable. 

If you look at the impedance of ferrite cores used to block noise or EMI, you might find that resistive components are the most important at the working frequency. The noise suppression gets better when the operating frequency gets closer to the ferrite core’s natural loss frequency.

Their function as low-pass filters

A low-pass LC filter based on a ferrite core requires a certain connection pattern, specifically a wire inserted and then followed through the ferrite coil. 

When an inductor coil is constructed, its impedance rises as a function of frequency. The inductor coil acts as a low-pass filter, preventing the high-frequency current from passing through it. The ferrite core filter has excellent attenuation properties at high frequencies.

Their function as surge compressors

We can all pretty much agree that a part of explaining what a ferrite core is involves talking about its characteristics and uses. The slew rate of voltage surges or electrostatic discharges in cables is slowed by the ferrite core, which is another of its properties. 

Current pulses and voltage surges created in cables as a result of electrostatic discharge are widespread and harmful to associated circuits or devices. If the surge exceeds the amount of current or voltage that a linked part can handle, it will burn out the part. 

Ferrite cores are used to slow down the rate at which current spikes or voltage surges change direction by soaking the transient energy instead of reflecting it or sending it to other parts or subsystems. Oh, and do you know what else is interesting to note? It has been found that cables with ferrite cores significantly reduce the severity of voltage spikes caused by electrostatic discharge.

Lastly, we want you to understand that when developing a ferrite core, the material choice of ferrite is crucial. The way a ferrite core works depends on the impedance features at the operating frequency. You can discover more relevant info on this page


Now this all might sound like science fiction to you, but the more interesting and helpful information you discover about ferrite cores, the easier it will be to understand them. We hope we’ve cleared some things for you by the end of the article. There’s no doubt that you’ll figure out whether you need to get one of these bad boys or not. 

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