Resonant Power Conversion through a Saturable Reactor

  • Luis Jorge
  • Stanimir Valtchev
  • Fernando Coito
Part of the IFIP Advances in Information and Communication Technology book series (IFIPAICT, volume 423)

Abstract

The resonant converter control is usually implemented by electronic circuits that regulate the parameters of the necessarily produced energy pulses of circulating in the resonant circuit. In the same time the power circuit is characterized by fixed (or uncontrollably varying) parameters. In this article a research is described that shows a long time ago forgotten techniques: the magnetic amplifier that controls the power circuit parameters and as a result, changes the resonant frequency depending on the needs of control. The inductance that is made to vary its value in a controllable, continuous and linear mode would be a perfect (non-dissipative) regulator for the power converter. This can be achieved through a DC magnetization applied as a control command to the magnetic core. By varying this magnetization current and hence the magnetic parameters of the core, the inductance L is possible to be adjusted to a desired value. This operation is similar to the principle of the (long ago) well known “magnetic amplifier” or the “saturable core reactor” as it is often called. The magnetic amplifier usually has an AC source in series with the load and with its primary while in the secondary the DC control signal is applied. The application of a regulated inductance device in the Wireless Power Transfer (WPT) will guarantee a simple way to adjust the frequency of the transmitter and/or the receiver to achieve the required impedance adaptation and efficient energy transfer.

Keywords

Magnetic amplifier mag amp saturable reactor wireless power transfer 

References

  1. 1.
    Steffen Jr., E.W.: Lieutenant Commander, United States Navy– United States Naval Postgraduate School, Annapolis, Maryland (1948)Google Scholar
  2. 2.
  3. 3.
    Lufcy, C.W.: A survey of Magnetic Amplifier (January 7, 1955)Google Scholar
  4. 4.
    Woodson, H.H.: Doctor of Science Thesis. Magnetic Amplifier Analysis Using a generalized Model for the Saturable Reactor Core. MIT (1956)Google Scholar
  5. 5.
    Lee, I.-I., Chen, D.Y., Wu, Y.-P., Iamerson, C.: Modelling of Control Loop Behaviour of MagAmp Post Regulators. IEEE Trans. on Power Electronics 5(4) (1990)Google Scholar
  6. 6.
    Takashima, Y., Hata, S.: Variable Gain Magnetic Amplifier and Application for Power Invariance Control System. Osaka Prefecture University Education and Research Archives (March 31, 1971)Google Scholar
  7. 7.
    International Commission on Non-Ionizing Radiation Protection (ICNIRP) – Guidelines for Limiting Exposure to Time-varying Electric, Magnetic and Electromagnetic Fields (up to 300GHz) (1998)Google Scholar
  8. 8.
    Grilo, F.C.V.: O TRANSDUTOR (Amplificador Magnético) (1953)Google Scholar
  9. 9.
    Mali, P.: Magnetic Amplifiers - Principles and Applications. John F. Rider Publisher, Inc., New YorkGoogle Scholar
  10. 10.
    Platt, S.: Magnetic Amplifiers – Theory and Application. Prentice-Hall, Inc., Englewood Cliffs (1958)Google Scholar

Copyright information

© IFIP International Federation for Information Processing 2014

Authors and Affiliations

  • Luis Jorge
    • 1
  • Stanimir Valtchev
    • 1
  • Fernando Coito
    • 1
  1. 1.Faculdade de Ciências e TecnologiaUniversidade Nova de LisboaCaparicaPortugal

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