Electronics & High Technology Components
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 Thyristor is a type of semiconductor
device that is widely used in power control applications. It is also known as a
Silicon Controlled Rectifier (SCR). Here is some information about its invention,
inventor, uses, construction, fabrication, and schematic symbol:
Invention and Inventor: The thyristor was invented by William Shockley, John
Bardeen, and Walter Brattain in 1947 while they were working at Bell Laboratories.
They were awarded the Nobel Prize in Physics in 1956 for their invention of the
transistor, which is a related device.
Uses: Thyristors are used in a variety of applications that require precise control
of electrical power. Some common uses include motor control, lighting control, temperature
control, and power conversion.
Construction and Fabrication: A thyristor is a four-layer semiconductor device
that consists of two PN junctions, with an additional P or N layer between them.
The device is made of silicon, and it is manufactured using a process similar to
that used to make transistors. The construction of the thyristor allows it to be
turned on and off by applying a small signal to the gate terminal.
Schematic Symbol: The schematic symbol for a thyristor consists of two P-N junctions
connected in series, with a gate terminal at the junction between the P and N layers.
The symbol is similar to that of a diode, but with an additional terminal for the
gate.
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