Diode
is an electronic component, which allows current to flow in one direction
It
has two Terminals; Anode & Cathode.
It is used in two
modes; Forward bias and Reverse bias.
1.
Forward bias: When +ve Voltage is connected to Anode
and –ve to Cathode.
2.
Reverse bias: When -ve Voltage is connected to Anode
and +ve to Cathode.
Zener Diode &
Photo Diode are used in reverse bias mode.
In Forward bias, it
shows least resistance and in Reverse bias it shows higher resistance.
Some diodes are
used in forward bias and some are used in Reverse bias.
There are many
types of Diodes, and according to the requirement, they are used.
Type of Diode
1.
Normal Rectifier Diode
2.
Light Emitting Diode (LED)
3.
Zener Diode
4.
Schottky Diode
5.
Photo Diode
6. Transient Voltage
Suppression Diode (TVS)
Rectifier/Power Diode
This is also known
as Power Diode
This is used for
rectification in power supplies
This is used in
Forward Bias
1N4001
is a power diode used for rectification
Other
are also available, 1N4002/03/04/05/06/07
Light Emitting Diode (LED)
This is used in
many applications for output indication
This is used in
Forward Bias
These are available
in various colours and sizes
Zener Diode
This diode is used
in low power voltage regulation
This is used to
protect circuit from overload
This is used in
Reverse Bias
These are available
in different voltages
Schottky Diode
This diode is also
known as Schottky barrier diode, hot-carrier diode
It functions in
forward bias
It has a
low forward voltage drop
It performs very
fast switching action
Voltage clamping,
Rectification in SMPS
Photo Diode
This diode converts
light into electrical current
This is also known
as Photo-Detector, Light Detector, Photo-Sensor
This is used in
Reverse Bias
TVS Diode
This is used to
protect electronics from voltage spikes induced on connected wires
This is also known
as transil, thyrector
It is a clamping
device
It suppresses all
overvoltage above its breakdown voltage
These can be unidirectional
or bidirectional