Thyristor: Definition & Working Principles

In summary, a thyristor is a type of transistor made up of two or more heavy duty transistors in one package. It is used to switch on or off a large current between its two main power terminals by applying a small current to a third terminal called a gate. This is similar to the function of electromagnetic relays. The most notable feature of thyristors is their "latching" property, where they stay on until the current is turned off by other means. In AC circuits, this is not usually an issue as the current reduces to zero twice per cycle.
  • #1
AlejandroMC
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0
What is a thyristor and how do they work?
 
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  • #2
It's a variation on a transistor, (well two or more heavy duty transistors in a package).
Generally they are used to switch on/off a large current across it's two main power terminals by applying a small current to a third terminal called a gate.
(Switching OFF is a little more complicated, entailing that the main power source has dropped or has reversed.)
They more or less replace the job that used to be done by electromagnetic relays.
 
  • #3
https://en.wikipedia.org/wiki/Thyristor

Their most interesting property is the "latching" property. Once turned ON they stay ON until the current through them is turned OFF by other means. In an AC circuit the current reduces to zero twice per cycle so turning them OFF isn't usually a problem
 

What is a thyristor?

A thyristor is a semiconductor device that is used as a switch, controlling the flow of electrical current in a circuit. It is composed of four layers of alternating P-type and N-type materials, with three terminals: an anode, a cathode, and a gate.

How does a thyristor work?

A thyristor works by using a small current at the gate terminal to control a larger current between the anode and cathode terminals. When the gate current is applied, it triggers a process called "latching," which allows the thyristor to conduct electricity until the current is interrupted.

What are the different types of thyristors?

There are several types of thyristors, including SCR (Silicon Controlled Rectifier), TRIAC (Triode for Alternating Current), DIAC (Diode for Alternating Current), and GTO (Gate Turn-Off Thyristor). Each type has a slightly different structure and function, but they all operate on the same basic principles.

What are the main applications of thyristors?

Thyristors are commonly used in power control and conversion circuits, such as in dimmer switches, motor speed control, and voltage regulation. They are also used in electronic devices such as televisions, computers, and industrial equipment.

What are the advantages of using thyristors?

Thyristors have several advantages, including high efficiency, fast switching speeds, and high power handling capabilities. They also have a long lifespan and are relatively inexpensive compared to other types of electronic switches.

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