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Edtech2

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This is the presentation about diode.

This is the presentation about diode.


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Transcript

  • 1. Semiconductor Diode
  • 2. Diode
    It is an electronic device that ideally conducts in only one direction.
  • 3. Actual Features
    Leg
    Leg
    Anode
    Cathode
  • 4. Electrical Symbol
  • 5. PN Junction of DIODE
    • In N- Type material, The electron is called majority carrier and hole is minority carrier.
    • 6. In P- type material, the electron is called minority carrier and hole is majority carrier.
  • Internal Junction of DIODE
    N
    P
    Electrons
    Hole
    Depletion Region
    Metal Contact
  • 7. Diode Applications
    • Radio demodulation
    The first use for the diode was the demodulation of amplitude modulated (AM) radio broadcasts. The history of this discovery is treated in depth in the radio article
  • 8.
    • Power conversion
    Rectifiers are constructed from diodes, where they are used to convert alternating current (AC) electricity into direct current (DC). 
  • 9.
    • Over-voltage protection
    Diodes are frequently used to conduct damaging high voltages away from sensitive electronic devices.
  • 10.
    • Logic gates
    Diodes can be combined with other components to construct
     AND and OR logic gates. This is referred to as diode logic.
  • 11.
    • Ionizing radiation detectors
    In addition to light, mentioned above, semiconductor diodes are sensitive to more
     energetic radiation.
  • 12.
    • Temperature measurement
    A diode can be used as a temperature measuring device, since the forward voltage drop across the diode depends on temperature, as in a Silicon band gap temperature sensor.
  • 13.
    • Current steering
    Diodes will prevent currents in unintended directions. To supply power to an electrical circuit during a power failure, the circuit can draw current from a battery.
  • 14. Types of Diodes
    • Light Emitting Diode (LED)
     It is one of the most popular type of diodes and when this diode permits the transfer of electric current between the electrodes, light is produced.
  • 15.
    • Avalanche Diode
    This type of diode operates in the reverse bias, and used avalanche effect for its operation. Generally, the avalanche diode is used for photo-detection, wherein high levels of sensitivity can be obtained by the avalanche process. 
  • 16.
    • Laser Diode
    This type of diode is different from the LED type, as it produces coherent light. These diodes find their application in DVD and CD drives, laser pointers, etc. Laser diodes are more expensive than LEDs. 
  • 17.
    • Zenerdiode
    This type of diode provides a stable reference voltage, thus is a very useful type and is used in vast quantities. The diode runs in reverse bias, and breaks down on the arrival of a certain voltage.
  • 18.
    • Rectifier Diode
    These diodes are used to rectify alternating power inputs in power supplies. They can rectify current levels that range from an amp upwards. If low voltage drops are required.

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