Power and Switching Devices

  • M. Ramamoorty


As already mentioned in Chapter 1 the term ‘thyristor’ is used for the family of semiconductor devices that exhibit bistable characteristics and can be switched on and off like the gas-tube thyratron. The SCR, which has been discussed in detail in Chapter 2, is a member of this family, and is widely used because of its large power-handling capacity. The operating characteristics of some of the other important thyristors are described in this chapter. All, except the triac, are low-power devices often used for switching in control circuits. They also find applications as efficient triggering devices for SCRs and triacs, and in digital and pulse circuits.


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  1. Aldrich, R.W., Holonyak, Jr., N., Multiterminal PNPN switches, Proc. IRE, 1958, p. 1236.Google Scholar
  2. Galloway, J.H., Using triac for control of AC power, Application Note 200.35, G.E. Company, Syracuse, USA.Google Scholar
  3. Gentry, F.E., Bidirectional triode PNPN switches, Proc. IEEE, 1965, p. 355.Google Scholar
  4. Howel, E.K., The light activated SCR, Application Note 200.34, G. E. Company, Syracuse, USA.Google Scholar
  5. Spoffard, W.R., Programmable unijunction transistor, Application Note 90.70, G.E. Company, Syracuse, USA.Google Scholar
  6. Stasior, R.A., Silicon controlled switches, Application Note 90.16, G.E. Company, Syracuse, USA.Google Scholar

Copyright information

© Affiliated East-West Press Private Limited 1977

Authors and Affiliations

  • M. Ramamoorty
    • 1
  1. 1.Indian Institute of TechnologyKanpurIndia

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