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Power electronics

  • Lionel Warnes
Chapter
Part of the Electrical and Electronic Engineering book series (EAEE)

Abstract

POWER ELECTRONICS is the name given nowadays to the study of circuits and systems using solid-state devices to control electrical power. Though power devices such as SCRs became common in high-voltage traction motors as long as thirty years ago, it is only in the last ten years that the marriage of microprocessors and power devices has brought about a revolution in the control of electrical power. This is especially noteworthy in electric motor drives. We have seen that speed control of AC motors was not easy from a supply of fixed frequency, and that DC motors were preferred when a large range of speeds was required. Power electronics has removed that restriction by making it possible to operate AC and DC machines over a large range of speeds by varying the frequency or the voltage, or both, of its supply. In essence the methods are
$$\begin{gathered} 1.\;\;AC\left( {{{f}_{1}},\;{{V}_{1}}} \right)\to converter\to AC\left( {{{f}_{2}},\;{{V}_{2}}} \right) \hfill \\ 2.\;\;AC\left( {{{f}_{1}},\;{{V}_{1}}} \right)\to rectifier\to DC\to converter\to AC\left( {{{f}_{2}},\;{{V}_{2}}} \right) \hfill \\ \end{gathered}$$
There is no space here to go into the details of control circuitry but some of the essentials of power electronics can be discussed, starting with the three-phase bridge rectifier.

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Copyright information

© L.A.A. Warnes 1998

Authors and Affiliations

  • Lionel Warnes
    • 1
  1. 1.Department of Electronic and Electrical EngineeringLoughborough University of TechnologyUK

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