Why there is a cylinder at the end of your charger?

The cylinders are designed to reduce the possibility of electrical interference with other electrical sources and devices. The cylinder is called a ferrite bead, ferrite core, or, more generally, a choke. Cables can act like unintentional antennas, broadcasting electrical interference (“noise”) or picking it up.

What is this cylindrical plastic thing at the end of power cables?

In a computer system or charger, you normally see these “cylinders” on the cables. You can even find them on power supply wires. These “cylinders” are called ferrite beads or sometimes ferrite chokes. A ferrite bead is simply a hollow bead or cylinder made of ferrite, iron oxide (rust) alloyed with other metals.

What does the block on a laptop charger do?

Your laptop and its battery can’t use the full amount of electricity provided by a regular household or office outlet, which produces 120 volts of alternating current. Inside the adapter’s “line lump,” a stepdown transformer reduces the strength of the current to a level the system can use.

What is the lump on a power cable for?

A ferrite bead has the property of eliminating the broadcast signals. Essentially, it “chokes” the RFI transmission at that point on the cable — this is why you find the beads at the ends of the cables. Instead of traveling down the cable and transmitting, the RFI signals turn into heat in the bead.

What are the cylinders on charging cables?

These cylinders are also common on keyboard cables as well. Each casing includes what are called ferrite beads, which are used to eliminate energy loss in the cord. They are sometimes called EMI filters or chokes, but they are always used to make charging and power transfer more efficient.

Are ferrite beads necessary?

Ferrite beads and cores are used in equipment design to suppress and dissipate high frequency noise levels caused by electromagnetic devices. Ferrite components are used to attenuate EMI and can be extremely effective. However, ferrite cores may also need to be installed on cabling as well.

Do ferrite cores work?

Ferrite cores are most effective in providing attenuation of unwanted noise signals above 10 MHz. For low-frequency cable emission problems, typically below 10 MHz, ferrite chokes have not been very useful, since their impedance is too low, at these frequencies, to be effective.

Why laptop charger has a small cylinder?

What purpose does the small cylindrical module near the end of my laptop charger cable serve? They are called ferrite beads/EMI filters/ferrite chokes and contain the semi-magnetic substance Ferrite made from iron oxide (rust) alloyed with other metals . They prevent the cable from sending/recieveing signals.

What does a laptop charger consists of?

Laptop charger basically contains a power supply that is either linear or switch mode. The common components of both include transformer, ac-dc converter (most probably a bridge rectifier circuit),dc-dc converter, feedback loop to maintain output at the required value.

Why do laptop chargers have small cylinders?

Why do cables have ferrite core?

Ferrite cores (chokes) provide an inexpensive, and effective, way of coupling high-frequency resistance into a cable in order to reduce the common-mode current, and hence the radiation (or pickup) from the cable. Ferrite cores are most effective in providing attenuation of unwanted noise signals above 10 MHz.