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How a Ferrite Bead Inductor Works to Eliminate Interference

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How a Ferrite Bead Inductor Works to Eliminate Interference

A ferrite bead on the end of a USB cable. What does that mean? It means that the sound from your computer or laptop will be more refined and mellow when it comes into contact with this technology. When you plug in an audio device or connect a video device such as a camera, you are often sacrificing some high-quality sound due to electromagnetic interference which is commonly referred to as noise interference. You are also cutting down the power that is transmitted through the cable as well as decreasing the amount of current that flows through your computer.


There are many different types of emperors and filters on the market today for use with computers and electronic devices. Unfortunately, none of these modern technologies can eliminate all forms of electromagnetic interference. Engineers and scientists have been working for years to create electromagnetic interference-free inductors. Surprisingly, they have been successful in creating this so-called ferrite beads. A ferrite bead (sometimes called a ferrite circuit block, ferrite ring, ferrite core, or ferrite choke) acts as an effective electromagnetic interference filter even at very high frequencies.


A ferrite bead can be used as an efficient form of low-cost protection against unintentional radiator heat radiations in electronic circuits where heat dissipation is important. If there are many devices that will be connected to one power source, then an additional low-loss conductor should be added. The addition of extra conductors in the circuit is called a bidirectional circuit that is designed to reduce electromagnetic interference. Ferrite beads are often used in applications that require protection against unintentional radiator heat radiations. In many cases, this is the most cost-effective method of protection available for use with electronic circuits because the cost of electrical heating and cooling outweighs the cost of employing low-loss ferrite beads.


The amount of reactance in an inductor relates to its magnetic field. The more reactance there is, the larger the induced current. The smaller the inductor's magnetic field, the smaller the induced currents produced by that indicator. In the case of ferrite beads, their reluctance and their induced currents are nearly proportional to each other. Thus, increasing the size of the ferrite bead increases the number of consequent currents that can be induced by that single inductor.


When the size of the ferrite beads used in any one particular application is too small, then that application is not appropriate for that application. The number of ferrite beads that can be employed in any one application also needs to be considered. For safety and efficiency purposes, the entire circumference of the coil should be at least two inches. This will give rise to very low levels of induced currents, thereby ensuring protection against undesired interference.


Since ferrite beads have a high frequency range, they can only work well in applications where the frequency range is very low. These include medical implants, MRI machines, and medical surgical procedures. Ferrite beads that have a high frequency range are highly undesirable because they generate a lot of electromagnetic interference. Additionally, the low frequency range that these types of materials emit has a detrimental impact on the operation of many types of communications systems. In these cases, it would be better to use other types of indicators that can provide the necessary protection against electromagnetic interference.

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