What Is This
Cylinder On Your Computer Charger For?
While my laptop charger has never bugged me,
but I always felt strange at times to see a bump in my laptop charger right
after it connects to the laptop. I always use to wonder why the charger has a
bump and what purpose does it serve?You normally see these “bumps” on the mouse,
keyboard and monitor cables in a typical computer system found in a home or
office. You can also find them on power supply wires when a device (like a
printer or scanner) uses an external transformer.It turns out that these bumps are called ferrite bead.
It may also be called blocks, core, rings, EMI (electromagnetic interference)
filters, or chokes. A ferrite bead has the property of eliminating broadcast
signals and prevents energy loss of the same type within the charger. This makes
the charger much more effective and helps charge your computer more quickly.
Their purpose is to reduce EMI and RFI (radio-frequency interference). These
cylinders are responsible for stopping very large deviation of power over
supply through the cable and power surges in currents that pass through the
cable and prevent ‘choke’ within the wire to make it any further supply the
current to the device. The blocking is most effective when it is near the
source of the EMI, that’s why you will only find these ferrite beads near the
end of the cables.
It
also acts as a choke or inductor that blocks high frequency noise in electronic
circuits. Ferrite bead employs the dissipation of high frequency currents in a
ferrite ceramic to build high frequency noise suppression devices.
The radiation released by the wires without the bead could cause interference
with other electronic objects around them, which act as receivers of this
radiation, for instance, causing noise in speakers. This phenomenon’s example
can be seen when cell phones interfere with the signal devices such as radios
and speakers, producing a recurring noise well known for electronic users.The bead is made up of ceramic
compounds, derived from iron oxide and/or oxides of other transition metals. It
helps to prevent the wire behave on over floating current like aerials. It
slips over the cable when the cable is made, or it can be snapped around the
cable in two pieces after the cable is made. The bead is encased in plastic —
if you cut the plastic, all that you would find inside is a black metal
cylinder. This metal wire can possibly serve as an antenna by absorbing or
releasing any radiation while passing current around it.
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