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Thyristor Operation

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Published in: Physics
4,604 Views

This PPT explains the operation of Thyristor, which is a Power Electronics Device. Power Electronics is an important Electrical Engineering subject.

Probeer S / Delhi

4 years of teaching experience

Qualification: M. Tech from Netaji Subhas Institute of Technology (NSIT)

Teaches: Algebra, Mathematics, Physics, Chemistry, Electrical, Electronics

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  1. Thyrlstors - I Probeer Sahw Probeer Sahw 1
  2. Today have eeeee Thyristor — Introduction — Representation — Construction Details — Operation & I-V Characteristics 00 Probeer Sahw
  3. 1. 2. 3. 4. 5. 6. 7. 8. Disclaimer The instructor hereby acknowledges that the following sources have been used as references for more than one instance for the presented course: M.H. Rashid, "Power Electronics: Circuits, Devices & Applications," Prentice Hall of India Ltd. , 3rd Edition, 2004. M.D. Singh and K.B.Khanchandani, "Power Electronics," Tata MC Graw Hill, 2005 Ned Mohan, T.M.Undeland and W.P.Robbins, "Power Electronics:Converters, Applications and Design," Wiley India Ltd, 2008. P.S.Bhimbra,"Power Electronics," Khanna Publishers, 4th Edition, 2009. David Perreault. 6.334 Power Electronics, Spring 2007. (Massachusetts Institute of Technology: MITOpenCourseWare), http://ocw.mit.edu (Accessed 26 Jan, 2015). License: Creative Commons BY-NC-SA. B.G.Fernandes and K.Chatterjee, "Power Electronics," NPTEL, http://nptel.ac.in/ . License: Creative Commons Attribution-ShareAlike - CC BY-SA. "Power Electronics," S.Sengupta, N.K..De, D.Prasad, and D.Kastha, NPTEL, http://nptel.ac.in/ . License: Creative Commons Attribution-ShareAlike - CC BY-SA. Bose, B. K., Modern Power Electronics and AC-Drives, Pearson Education Asia, Low Price Edition (LPE), Asia, 2003. Probeer Sahw 3
  4. Thyristor Probeer Sahw
  5. Introduction ' Bell laboratories first fabricated thyristor GEC introduced first prototype in 1957 Thyristor has characteristics similar to THYRatron and constructional features similar to a translSTOR The term thyristor was coined in a conference held by International Electrotechnica/ Commission in 1963 i. ii. Definition It constitutes three or more p-n junctions It has two stable states, ON state and OFF state and can change its state fro one to another Probeer Sahw
  6. Representation Gate de p n J2 p n Cathode Four layers p-n-p-n Three terminals — Anode(A), Cathode(K) and Gate(G) Three junctions Jl, J2 and J3 Voltage rating — 10 kv Current rating(rms) — 3000 A Power rating — 30 MW For Gate —1 A and 10 w Amplification - 3 x 106 Probeer Sahw
  7. Constructional Details Threade stud Gate terminal welded to p region Anode (Aluminium) J2 J3 Cathode Probeer Sahw
  8. Operation & I-V Characteristics There are three operating modes of a thyristor which are as following: — Reverse blocking mode — Forward blocking mode — Forward conduction mode Probeer Sahw
  9. Reverse blocking mode LOAD
  10. Gate Cathode
  11. Gate Cathode
  12. Probeer Sahw
  13. ? ? ? ? ? ? ? ? ? ? ? ? ? ??? ? ? ? ? ? ? 01 ? ? ? ? ?
  14. ? ? ? ? ? ? ? ? ? ? ? ? ? ??? ? ? ? ? ? ? 01 ? ? ? ? ?
  15. ?? ? 2 ? ?
  16. ? ? ? ? ? ? ? ? ? ?
  17. V-l characteristics Reverse leakage current Reverse blocking mode OFF o
  18. ?- ? ? ????»???? ??
  19. V-l characteristics Reverse breakdown v Itage Reverse leakage current Reverse blocking mode o
  20. Forward blocking mode LOAD
  21. Gate Cathode
  22. Gate Cathode
  23. Probeer Sahw
  24. ? ? ? ? ? ? ? ? ? ? ? ? ? ??? ? ? ? ? ? ? 01 ? ? ? ? ?
  25. JI O O o O O O O O o Ho O O O O O
  26. O O O O O O O O
  27. oo O oo O O O O O 0 0 0 oo oo oo oo Forward leakage current
  28. v -l characteristics Reverse leakage current Reverse blocking mode OFF lg=o BO + Va Forward leakage current Forward blocking mode o
  29. Forward conduction mode LOAD
  30. ??? ?? Avalanche
  31. v ON -l characteristics +1 a Reverse leakage current Reverse blocking mode K Forward conduction mode (on-state) Latching current Holding current lg=o BO + Va Forward leakage current Forward blocking mode Forward breakover voltage VBR= Reverse breakdown voltage Gate current o
  32. v -l characteristics +1 a Reverse leakage current Reverse blocking mode K Forward conduction mode (on-state) Latching current Holding current lg=o BO + Va Forward leakage current Forward blocking mode Forward breakover voltage VBR= Reverse breakdown voltage Gate current o
  33. Thank You Probeer Sahw 33

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