Types of Thyristor

 Thyristors are bistable switches that conduct currents when they're within the ahead place, which means the voltage has not been reversed. They're made of 4 layers of P and N-type materials, which renders the machine semiconductive. 

The N-type materials are created by doping a component with electrons to increase the number of negative charge-carrying electrons. P-type materials can be produced by doping, though the ensuing charge-carrying electrons are positively charged. By alternating layers of P- and N-type materials, a semiconductor thyristor machine is created. 

Types Of Thyristor


Two in a different way charged terminals, the anode, and cathode, carry the cost from one finish of the thyristor to the opposite. A 3rd management terminal, typically known as the gate, connects to the P materials in shut proximity to the cathode.

A thyristor can assume the following states:

1. Reverse blocking mode

2. Forward blocking mode

3. And forward conducting mode.


  • Reverse blocking mode means the voltage is utilized in a given path that can trigger a diode to dam the current.
  • Forward blocking mode entails making use of voltage in a given path that can trigger a diode to conduct the present, however, the thyristor has not been activated but, and conduction can not happen.
  • Forward conducting mode happens when the voltage has been utilized and the thyristor has been triggered, thus conducting voltage till the voltage dips under a degree often called the “holding present.”


Types Of Thyristor

There are a number of kinds of thyristors for various applications, including inverter, asymmetrical, and phase-control thyristors. Different variants embody gate turn-off thyristors and light-triggered thyristors.

Inverter Thyristors 

That includes quick turn-on and turn-off time, inverter thyristors typically function with DC energy provided and are present in high-speed switching functions. Voltage is usually varied as an inverse perform of the turn-off time.


Asymmetrical Thyristors 

This does not block substantial quantities of the reverse current. Generally abbreviated ASCR, asymmetrical thyristors work properly in functions the place the reverse voltage is comparatively low, between 20 and 30 Volts (V), and the place ahead voltage is between 400 and 2000 V.


Phase Control Thyristors

 The sort of thyristor doesn't have fast-switching capabilities and as an alternative operates at line frequency. Consequently, section management thyristors are applicable for energy frequency functions, reminiscent of DC drives, resistance welding, and sure energy transmission functions.


Gate Turn-Off Thyristor (GTO)

 A gate turn-off (GTO) thyristor is well-suited to functions with voltage over 2500 V or a present over 400 A. it can be crucial that every one element of the GTO are activated at an identical time by the gate pulse; likewise, it's equally vital that every one element turn off on the identical time, in any other case the thyristor is prone to turning into overloaded and subsequently broken.


Light-Triggered Thyristors 

Additionally known as photothyristors, light-triggered thyristors (LTTs) are particularly designed to react to extra carriers which can be optically produced. If sufficient carriers are produced, the situations are met to set off the thyristor and the thyristor activates.

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