T HYRISTOR S TRUCTURE AND S PECIFICATION Eric Canniff Cody Johnson.

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Presentation transcript:

T HYRISTOR S TRUCTURE AND S PECIFICATION Eric Canniff Cody Johnson

I NTRODUCTION AND O UTLINE History Basic Characteristics Structure Specifications Applications

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

B ASIC C HARACTERISTICS Thyristor is composed of four alternate layers of N-type and P-type material

T WO T RANSISTORS E QUIVALENT C IRCUIT

I-V C HARACTERISTICS

S TRUCTURE

B ILATERAL S TRUCTURE Allows for positive and negative voltages to pass

T RIAC S TRUCTURE

M OS TURN - OFF THYRISTOR

M OS G ATED T HYRISTOR V Groove Mos gated thyristor

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

S PECIFICATIONS 50A Medium Power Thyristor

A PPLICATIONS DC transmission of power from Manitoba Hydro dams Heart of High-voltage direct current conversions now a days

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

R EFERENCE S LIDE Neamen, Donald A. Semiconductor Physics and Devices. Fourth ed. New York: McGraw-Hill, Print. Vishay,. Medium Power Thyristors. N.p., 19 Sept Web. 27 Apr Sentaurus Technology Template: Light-Triggered Thyristor. N.p., Web. 28 Apr

K EY C ONCEPTS Structures Switching Characteristics Triggering Types Applications