T HYRISTOR S TRUCTURE AND S PECIFICATION Eric Canniff Cody
Johnson
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I NTRODUCTION AND O UTLINE History Basic Characteristics
Structure Specifications Applications
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H ISTORY 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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B ASIC C HARACTERISTICS Thyristor is composed of four alternate
layers of N-type and P-type material
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T WO T RANSISTORS E QUIVALENT C IRCUIT
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I-V C HARACTERISTICS
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S TRUCTURE
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B ILATERAL S TRUCTURE Allows for positive and negative voltages
to pass
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T RIAC S TRUCTURE
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M OS TURN - OFF THYRISTOR
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M OS G ATED T HYRISTOR V Groove Mos gated thyristor
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L IGHT T RIGGERED 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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S PECIFICATIONS 50A Medium Power Thyristor
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A PPLICATIONS DC transmission of power from Manitoba Hydro dams
Heart of High-voltage direct current conversions now a days
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S UMMARY AND C ONCLUSION 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
Slide 16
R EFERENCE S LIDE 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.. Sentaurus Technology Template: Light-Triggered Thyristor.
N.p., 2013. Web. 28 Apr. 2013..
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K EY C ONCEPTS Structures Switching Characteristics Triggering
Types Applications