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THYRISTOR STRUCTURE AND SPECIFICATION
Eric CanniffCody Johnson
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INTRODUCTION AND OUTLINE
History Basic Characteristics Structure Specifications Applications
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HISTORY William Shockley proposed the concept of the
Silicon Controlled Rectifier (SCR) in 1950 Engineers at Bell Labs supported this idea In 1956 Under the supervision of Gordon Hall,
General Electric created an SCR Soon became a commercial product, due to
the efforts of Frank W. Gutzwiller Predecessor was a gas filled tube device
called a Thyratron
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BASIC CHARACTERISTICS Thyristor is composed of four alternate layers
of N-type and P-type material
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TWO TRANSISTORS EQUIVALENT CIRCUIT
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I-V CHARACTERISTICS
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STRUCTURE
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BILATERAL STRUCTUREAllows for positive and negative voltages to pass
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TRIAC STRUCTURE
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MOS TURN-OFF THYRISTOR
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MOS GATED THYRISTOR V Groove Mos gated thyristor
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LIGHT TRIGGERED THYRISTOR (LTT) Have an optically sensitive region in the gate Used for protection of control circuit for HVDC Usually triggered by Infrared Light
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SPECIFICATIONS 50A Medium Power Thyristor
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APPLICATIONS DC transmission of
power from Manitoba Hydro dams
Heart of High-voltage direct current conversions now a days
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SUMMARY AND CONCLUSION Thyristor is a 4-layered alternating pn-
material device Semiconductor Controlled Rectifier (SCR) Needs only a small gate pulse to stay on 4 Basic structures Mainly used in high voltage application
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REFERENCE SLIDE Neamen, Donald A. Semiconductor Physics
and Devices. Fourth ed. New York: McGraw-Hill, 2012. 691-701. Print.
Vishay, . Medium Power Thyristors. N.p., 19 Sept. 2008. Web. 27 Apr. 2013. <http://www.vishay.com/docs/93711/50ria.pdf>.
Sentaurus Technology Template: Light-Triggered Thyristor. N.p., 2013. Web. 28 Apr. 2013. <http://www.synopsys.com/Tools/TCAD/Pages/thyristor.aspx>.
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KEY CONCEPTS Structures Switching Characteristics Triggering Types Applications