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Thyristor Structures, Specifications, and Applications

Thyristor Structures, Specifications, and Applications. Presenters: Jerald Thomas, Steve Jungst April 25, 2014.

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Thyristor Structures, Specifications, and Applications

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  1. Thyristor Structures, Specifications, and Applications Presenters: Jerald Thomas, Steve Jungst April 25, 2014 Abstract: Thyristor devices are common, yet largely misunderstood semiconductor devices. In this presentation we go into the background, lithography and structure, basic operations, and finally common applications of the thyristor. At the end we will give our concluding thoughts as well as five key concepts related to the thyristor that we believe all EE students should understand.

  2. Outline • Thyristor origins, background and family • Semiconductor structure • Basic operations • Applications • Questions

  3. Thyristor Origins • Thyristor – “thyratron” + “transistor” Attribution: BenediktSeidl Attribution: Eric Barbour

  4. History • Proposed by William Shockley in 1950. • Physically created by General Electric in 1956. • Popularized in the 1960’s. Source: Stanford News Service

  5. Basic Internal Thyristor Structure Source: Semiconductor Physics and Devices: Basic Principles

  6. Basic Operations Attribution: Mikhail Ryazanov Source: electrodata.blogspot.com

  7. Three Modes of Operation • 1. Reverse Blocking Mode • 2. Forward Blocking Mode • 3. Forward Conducting Mode Source: Semiconductor Physics and Devices: Basic Principles Source: Semiconductor Physics and Devices: Basic Principles

  8. Applications • High current and high voltage • Controlling AC currents • Snubber circuits • Motor speed controllers • Light dimmers • Pressure-control systems/ liquid-level regulators Source: www.helvar.nl Source: www.belimo.pl

  9. Circuit Application (Crowbar) Attribution: Steve Jungst

  10. Summary The thyristor is a unique device, with a unique lithography, capable of many applications. Applications regarding alternating current with lower frequencies are where the thyristor really stands above others.

  11. Questions? Source: Google Patent Search Source: Google Patent Search

  12. Key Concepts: • A SCR will continue to conduct current across the anode-cathode junction when the gate potential has been removed as long as the aforementioned current is above the thyristor latching current. • When compared to a transistor, a thyristorhas lower switching speeds. • Thyristors main application area is regarding alternating current • A thyristor has three main modes of operation: forward blocking, reverse blocking, and forward conducting. • The thyristor is the successor to the thyratron, a gas filled tube device that could switch large currents using a small control voltage.

  13. Supplemental Reading/Sources • Neamen, Donald A. "15.6 | THE THYRISTOR." Semiconductor Physics and Devices: Basic Principles. 4th ed. Vol. 1. New York, NY: McGraw-Hill, 2012. 691-701. Print. • Poole, Ian. "What Is a Thyristor or Silicon Controlled Rectifier, SCR." What Is a Thyristor. Radio-Electronics.com, n.d. Web. 19 Apr. 2014. • "Thyristor Basics." PowerGuru. N.p., 12 Sept. 2012. Web. • "Thyristor." Tech-FAQ. Tech-FAQ, 27 Sept. 2012. Web. 20 Apr. 2014. • "What Is a Thyristor, SCR?" :: Electronics and Radio Today. N.p., n.d. Web. 22 Apr. 2014.

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