Thyristor circuits basics

  • Adolph Blicher
Part of the Applied Physics and Engineering book series (APPLIED PHYS, volume 12)

Summary

Phase control and zero-voltage switching are the basic power control methods used in the SCR and triac circuits. Phase control is achieved by resistive or resistive—capacitive networks or by triggering pulses derived from such devices as diacs, unijunction transistors, two-transistor trigger circuits, and neon bulbs.

In order to turn off the thyristor, it is necessary to reduce the main current below the holding-current level. In an ac circuit, the current passes through zero every half cycle so the turn off of the thyristor also is assured every half cycle. The commutation of a thyristor in a DC circuit requires, however, the use of additional circuitry.

To avoid either false triggering or damage to a thyristor due to transients, some simple protective networks are usually recommended.

Practical applications of SCRs and/or triacs are shown in the circuits of light dimmers, universal motor controllers, heat controllers, and DC-to-AC inverters.

Keywords

Furnace Torque Selenium Radioactive Isotope Assure 

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References

  1. 17.1
    RCA. Solid state power circuits. Technical Series SP-52, RCA Solid State Division, 1971.Google Scholar
  2. 17.2
    GE SCR Manual, 5th ed., Syracuse, N.Y.: General Electric, 1972.Google Scholar
  3. 17.3
    J. M. Neilson. Light dimmers using Triacs. RCA Application Note AN-3778.Google Scholar
  4. 17.4
    F. E. Gentry, F. W. Gutzwiller, N. Holonyak, Jr., E. E. Von Zastrow. Semiconductor Controlled Rectifiers. New York: Prentice-Hall, 1964.Google Scholar
  5. 17.5
    J. V. Yonushka. Application of RCA silicon controlled rectifiers to the control of universal motors. RCA Thyristor Application Note AN-3469, Somerville, N.J., 1968.Google Scholar
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    J. V. Yonushka. Triac power control application. RCA Thyristor Application Note AN-3697.Google Scholar
  7. 17.7
    J. E. Wojslawowicz. Analysis and design of snubber networks for dv/dt suppression in thyristor circuits. RCA Application Note AN-4745.Google Scholar
  8. 17.8
    John D. Harnden, Jr. and Forest B. Golden, Eds. Power Semiconductor Applications. New York: John Wiley, 1972.Google Scholar
  9. 17.9
    B.D. Bedford and G. R. Hoft. Principles of Inverter Circuits. New York: John Wiley, 1964.Google Scholar
  10. 17.10
    W. McMurray. The Theory and Design of Cycloconverters. Cambridge, Mass.: MIT Press, 1972.Google Scholar
  11. 17.11
    RCA Solid State, 1975 Thyristors/Rectifiers Data Book, Somerville, N.J., SSD-206C.Google Scholar
  12. 17.12
    N. W. Mapham. The classification of SCR inverter circuits. IEEE International Convention Record, Part 4, pp. 99–105, 1964.Google Scholar
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    W. McMurray. SCR inverter commutated by an auxiliary impulse. 1964 Proceedings of the Intermag Conference.Google Scholar
  14. 17.14
    N. W. Mapham. An SCR inverter with good regulation and sine wave output. IEEE Trans. Industr. Gen. Applic, IGA-3: 176–187, 1967.CrossRefGoogle Scholar

Also of interest

  1. G. J. Deboo and C. Burrows. Integrated Circuits and Semiconductor Devices. New York: McGraw-Hill, 1971.Google Scholar
  2. P. Atkinson. Thyristors and Their Applications. London: Mills & Boon,1972.Google Scholar
  3. F. F. Mazda. Thyristor Control. New York: John Wiley, 1973.Google Scholar

Copyright information

© Springer-Verlag New York Inc. 1976

Authors and Affiliations

  • Adolph Blicher
    • 1
    • 2
  1. 1.RCA Corp.USA
  2. 2.Advanced Devices and Applications Dept.Solid State Technology CenterSomervilleUSA

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