Information about Electronics;
In this blog I will be describe about capacitor. Its types
and features.
Capacitors;
A capacitor
is a passive two-terminal electronic component that stores electrical energy in
an electric field. The effect of a capacitor is known as capacitance.
Types of capacitor;
Capacitors
are used in virtually every electronics circuit that is built today. Capacitors
are manufactured in their millions each day, but there are several different
capacitor types that are available.
Ceramic capacitor: As the name indicates, this type of
capacitor gains its name from the fact that it uses a ceramic dielectric. This
gives the many properties including a low loss factor, and a reasonable level
of stability, but this depends upon the exact type of ceramic used. Ceramic
dielectrics do not give as high a level of capacitance per unit volume as some
types of capacitor and as a result ceramic capacitors typically range in value
from a few Pico farads up to values around 0.1 µF.
Electrolytic capacitor:
This type of capacitor is the most popular leaded type for values
greater than about 1 microfarad, having the one of the highest levels of
capacitance for a given volume. This type of capacitor is constructed using two
thin films of aluminium foil, one layer being covered with an oxide layer as an
insulator. An electrolyte-soaked paper sheet is placed between them and then
the two plates are wound around on one another and then placed into a can.
Plastic film capacitors:
There are two main formats for the construction of plastic film
capacitors:
Metallized film:
In this type of film capacitor the plastic film has a very thin layer of
metallization deposited into the film. This metallization is connected to the
relevant connection on one side of the capacitor or the other.
Film foil:
This form of film capacitor has two metal foil electrodes that are
separated by the plastic film. The terminals are connected to the end-faces of
the electrodes by means of welding or soldering.
Tantalum:
Ordinary aluminum electrolytic capacitors are rather large for many
uses. In applications where size is of importance tantalum capacitors may be
used. These are much smaller than the aluminum electrolytic and instead of
using a film of oxide on aluminum they us a film of oxide on tantalum. They do
not normally have high working voltages, 35V is normally the maximum, and some
even have values of only a volt or so.
Super cap;
Super capacitors with capacitance levels of a Farad or more are now
becoming more commonplace. These super capacitors are generally used for
applications like memory hold up and the like.
good
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