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Thyristor Structure and Specification

Thyristor Structure and Specification. Eric Canniff Cody Johnson. Introduction and Outline. History Basic Characteristics Structure Specifications Applications. History. William Shockley proposed the concept of the Silicon Controlled Rectifier (SCR) in 1950

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Thyristor Structure and Specification

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  1. Thyristor Structure and Specification Eric Canniff Cody Johnson

  2. Introduction and Outline • History • Basic Characteristics • Structure • Specifications • Applications

  3. 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

  4. Basic Characteristics • Thyristor is composed of four alternate layers of N-type and P-type material

  5. Two Transistors Equivalent Circuit

  6. I-V Characteristics

  7. Structure

  8. Bilateral Structure Allows for positive and negative voltages to pass

  9. Triac Structure

  10. Mos turn-off thyristor

  11. Mos Gated Thyristor • V Groove Mos gated thyristor

  12. 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

  13. Specifications • 50A Medium Power Thyristor

  14. Applications • DC transmission of power from Manitoba Hydro dams • Heart of High-voltage direct current conversions now a days

  15. 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

  16. 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>.

  17. Key Concepts • Structures • Switching Characteristics • Triggering • Types • Applications

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