Diode Electronic Component
Learn What is Diode Electronic Component – Definition, Types, Symbol, Uses and Application of Diodes in Electronics.
Here we Learn What is Diode Electronic Component – Definition, Types, Symbol, Uses and Application of Diodes in Electronics.
What is a Diode?
They are most commonly used to convert AC to DC, because they pass the positive (+) part of the wave, and block the negative (–) part of the AC signal, or, if they are reversed, they pass only the negative part and not the positive part.
Both p-type and n-type silicon will conduct electricity just like any conductor; however, if a piece of silicon is doped p-type in one section and n-type in an adjacent section, current will flow in only one direction across the junction between the two regions.
Diodes one of the most basic semiconductor devices.
What is a Forward Biased Diode?
A diode is called forward biased if it has a positive voltage across it from from the p- to n-type material. In this condition, the diode acts rather like a good conductor, and current can flow, as in following figure:
There will be a small voltage across the diode, about 0.6 volts for Si, and this voltage will be largely independent of the current, very different from a resistor.
What is a Reverse Biased Diode?
If the polarity of the applied voltage is reversed, then the diode will be reverse biased and will appear non-conducting. Almost no current will flow and there will be a large voltage across the device.
Types of Diodes, Symbol and Uses
|Type of Diode||Uses||Symbol|
|Diode||Allows flow of electric current only in one direction, from left to right|
|Light Emitting Diode (LED)||Emits light when electric current flows|
|Photodiode||Current flow when exposed to light|
|Schottky Diode||Diode with low voltage drop|
|Tunnel Diode||Diode in which electric current decreases with increase in voltage.|
|Varactor / Varicap Diode||Diode with Variable capacitance.|
|Zener Diode||Current flows in one direction, but also can flow in the reverse direction when above breakdown voltage.|
Characteristics and Applications of Diodes
The non-symmetric behavior of diodes is due to the detailed properties of the pn-junction. The diode acts like a one-way valve for current and this is a very useful characteristic.
One application is to convert alternating current (AC), which changes polarity periodically, into direct current (DC), which always has the same polarity.
Normal household power is AC while batteries provide DC, and converting from AC to DC is called rectification. Diodes are used so commonly for this purpose that they are sometimes called rectifiers, although there are other types of rectifying devices.
Below figure shows the input and output current for a simple half-wave rectifier. The circuit gets its name from the fact that the output is just the positive half of the input waveform.
A full-wave rectifier circuit (Figure Below) uses four diodes arranged so that both polarities of the input waveform can be used at the output. The full-wave circuit is more efficient than the half-wave one.
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