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Thyristors: Types and Applications Explained

Learn about different types of thyristors and their applications in controlling large amounts of voltage and power. Understand the working principles and circuit symbols of thyristors. Explore how thyristors switch on and off in various states. Discover DC and AC thyristor circuits.

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Thyristors: Types and Applications Explained

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  1. Types Of Thyristors And Their Applications

  2. Types Of Thyristors And Their Applications Introduction: • Thyristor is a small device which can control large amounts of voltage and power. Thyristors are used as current reversal to turn off the device. Actually, it takes direct current so it is very difficult to apply to the device. Lets learn Types Of Thyristors And Their Applications in details. http://www.elprocus.com/

  3. Types Of Thyristors And Their Applications What is a Thyristor? • A thyristor is a four layer solid-state semiconductor device with P and N type material. • Whenever a gate receives a triggering current. • It starts’ conducting until the voltage across the thyistor device is under forward bias. • So it acts as a bistable switch under this condition.  • To control the large amount of current of the two leads. http://www.elprocus.com/

  4. Types Of Thyristors And Their Applications What is a Thyristor? • We have to design a three lead thyristor by combining the small amount of current to that current. • This process is known as control lead. • If the potential difference between the two leads is under breakdown voltage. • Then a two lead thyristor is used to switch on the device. http://www.elprocus.com/

  5. Types Of Thyristors And Their Applications Thyristor Circuit Symbol • Thyistor circuit symbol is as given below. It has three terminals Anode, cathode and gate. http://www.elprocus.com/

  6. Types Of Thyristors And Their Applications Different States in a Thyristor • There are three states in a thyristor • Reverse blocking mode– In this mode of operation, the diode will block the voltage which is applied. • Forward blocking mode– In this mode, the voltage applied in a direction makes a diode to conduct. But conduction will not happen here because the thyristor has not triggered. • Forward conducting mode– The thyristor has triggered and current will flow through the device until the forward current reaches below the threshold value which is known as “Holding current”. http://www.elprocus.com/

  7. Types Of Thyristors And Their Applications Thyristor Layer Diagram http://www.elprocus.com/

  8. Types Of Thyristors And Their Applications Thyristor Layer Diagram • Thyristor consists of three p-n junctions namely J1, J2, and J3. • If the anode is at a positive potential with respect to the cathode and the gate terminal is not triggered with any voltage. • Then J1 and J3 will be under forward bias condition. • While J2 junction will be under reverse bias condition. • So J2 junction will be in the off state (no conduction will take place). http://www.elprocus.com/

  9. Types Of Thyristors And Their Applications Thyristor Layer Diagram • If the increase in voltage across anode and cathode beyond the VBO (Breakdown voltage). • Then avalanche breakdown occurs for J2. • Then thyristor will be in ON state (starts conducting). • If a VG (Positive potential) is applied to the gate terminal. • Then a breakdown occurs at the junction J2 which will be of low value VAK. http://www.elprocus.com/

  10. Types Of Thyristors And Their Applications Thyristor Layer Diagram • The thyristor can switch to ON state, by selecting a proper value VG. • Under avalanche breakdown condition. • The thyristor will conduct continuously without taking consideration of gate voltage, until and unless, • The potential VAK is removed or • Holding current is greater than the current flowing through the device. • Here VG– Voltage pulse which is the output voltage of the UJT relaxation oscillator. http://www.elprocus.com/

  11. Types Of Thyristors And Their Applications Thyristor Switching Circuits • The two types of thyristor switching circuits are DC Thyristor Circuit. AC Thyristor circuit. http://www.elprocus.com/

  12. Types Of Thyristors And Their Applications DC Thyristor Circuit http://www.elprocus.com/

  13. Types Of Thyristors And Their Applications DC Thyristor Circuit • When connected to the DC supply, to control the larger DC loads and current we use thyristor. • The main advantage of thyristor in a DC circuit as a switch gives a high gain in current. • A small gate current can control large amounts of anode current. • So the thyristor is known as a current operated device. http://www.elprocus.com/

  14. Types Of Thyristors And Their Applications AC Thyristor Circuit http://www.elprocus.com/

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