THYRISTOR STRUCTURE AND SPECIFICATION

Eric CanniffCody Johnson

INTRODUCTION AND OUTLINE

History Basic Characteristics Structure Specifications Applications

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

BASIC CHARACTERISTICS Thyristor is composed of four alternate layers

of N-type and P-type material

TWO TRANSISTORS EQUIVALENT CIRCUIT

I-V CHARACTERISTICS

STRUCTURE

BILATERAL STRUCTUREAllows for positive and negative voltages to pass

TRIAC STRUCTURE

MOS TURN-OFF THYRISTOR

MOS GATED THYRISTOR V Groove Mos gated thyristor

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

SPECIFICATIONS 50A Medium Power Thyristor

APPLICATIONS DC transmission of

power from Manitoba Hydro dams

Heart of High-voltage direct current conversions now a days

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

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>.

KEY CONCEPTS Structures Switching Characteristics Triggering Types Applications