Major Classification of Diodes:
·
Standard Diodes or General
Purpose Diodes:
Standard or general purpose diodes
have a comparatively high reverse recovery time, when compared to other diodes.
Due to this reason they are used in applications which are not time sensitive
and generally run on low speeds.
Usually the reverse recovery time
for general purpose diodes varies between 20 micro seconds to 30 micro seconds
which is quite a lot. Typical low speed applications for general purpose diodes
include the power diode being used as a rectifier or in a converter, where the
frequency input is quite low.
·
Fast Recovery Diodes
As their name suggests, these are
the type of power diodes which have a relatively faster reverse recovery time, which
usually varies from 2 micro seconds to 5 micro seconds. With such a fast
recovery time, they can be easily used in high speed switching applications
where the time is of great importance.
Due to their property of fast
reverse recovery, they are also comparatively expensive as compared to the
general purpose diodes.
·
Scotty Diodes:
Sometimes we face problem in charge
storage in a pn-junction. This thing can be minimized to a great extent in a Scotty
diode. A Scotty diode sets a barrier potential, i.e. a metal layer is deposited
on n-type silicon.
As the rectification depends upon
the majority charge carriers, so this layer prevents the recombination of these
majority charge carriers, and a fast recovery can also be achieved in this way.
Types of Power Diodes:
·
Silicon Diodes
The diode
detector verifies the radiation response and electrical characteristics of the
PIN diode, which is a diode made out of silicon. Silicone is capable of
handling high electrical fields without losing any of the electricity.
·
PIN Diodes
PIN
photodiodes are used as radiation detectors that are used for X-ray
measurements and for charged particles. The PIN diode spectrometer uses the
radiation detector, signal processing electronics and a computer that analyzes
and stores the information. Bias voltage is delivered to the detector. The
charged particles or X-rays are sent through a preamplifier, an amplifier and a
multichannel analyzer system (MCA). The charged particle creates a charged
motion that influences the electric field, which produces a current pulse for
the external circuit. An integrated current pulse is created that is
proportional to the energy lost, whether that energy be the charged particles
or the X-ray photons. The MCA is either a dedicated instrument or an
analog-to-digital converter that is connected and interfaced to the computer.
·
Reverse-Biased Diodes
Diode
detectors can be reverse-biased, which causes very little current to pass
through the diode until the reverse breakdown voltage is surpassed, according
to Newport.
·
Small Signal Diodes
Diode
detectors operate at low voltages in the square law region. These diodes are
known as small signal types, according to Newport. The higher voltage diodes
operate more in the linear region and are known as the large signal types.
·
Log Detector Amplifiers
Log detector
amplifiers use a series of amplifiers and diode detectors to detect output
voltage. These detectors have a very good range for detection, but they are very
large, which can make them inconvenient in some circumstances.
·
Gunn Diodes
Gunn diodes
are diodes that are used as local oscillators that have negative resistance.
This power diode produces very little noise and can operate at a very high
frequency. These diodes are commonly used with microwaves because of the
diode's efficiency and the frequency of the operation.
·
Epicap
The epicap a
voltage-variable diode used for electronic tuning. When circuits are tuned
electronically and electrically, they can function very quickly and reliably in
a small form, according to Educypedia. These diodes are also more thermally
stable and have less current leakage.
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