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Thyristor Operation

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

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    Thyrlstors - I Probeer Sahw Probeer Sahw 1
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    Today have eeeee Thyristor — Introduction — Representation — Construction Details — Operation & I-V Characteristics 00 Probeer Sahw
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    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
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    Thyristor Probeer Sahw
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    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
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    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
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    Constructional Details Threade stud Gate terminal welded to p region Anode (Aluminium) J2 J3 Cathode Probeer Sahw
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    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
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    Reverse blocking mode LOAD
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    Gate Cathode
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    Gate Cathode
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    Probeer Sahw
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    О О О О о О О О О О О О О оУо О О О О О О 01 О О О О О
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    О О О о О О О О О О О О О оУо О О О О О О 01 О О О О О
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    оо о 2 О О
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    О О О О О О О О О О
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    V-l characteristics Reverse leakage current Reverse blocking mode OFF o
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    ة- ت ، عدتت»ثهتر شد
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    V-l characteristics Reverse breakdown v Itage Reverse leakage current Reverse blocking mode o
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    Forward blocking mode LOAD
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    Gate Cathode
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    Gate Cathode
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    Probeer Sahw
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    О О О О о О О О О О О О О оУо О О О О О О 01 О О О О О
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    JI O O o O O O O O o Ho O O O O O
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    O O O O O O O O
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    oo O oo O O O O O 0 0 0 oo oo oo oo Forward leakage current
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    v -l characteristics Reverse leakage current Reverse blocking mode OFF lg=o BO + Va Forward leakage current Forward blocking mode o
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    Forward conduction mode LOAD
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    Гро оо Avalanche
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    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
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    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
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    Thank You Probeer Sahw 33

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