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Related Experiment Videos

A shunt-excited inductive power link.

K Sylvan1, J R Jordan, H W Whittington

  • 1Department of Electrical Engineering, University of Edinburgh, UK.

Journal of Medical Engineering & Technology
|July 1, 1989
PubMed
Summary
This summary is machine-generated.

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This study presents a network theory-based derivation for the separation-insensitive property in inductive power transfer circuits. The findings extend this principle to shunt-excited links, demonstrating stable voltage transfer under specific coupling conditions.

Area of Science:

  • Electrical Engineering
  • Network Theory
  • Wireless Power Transfer

Background:

  • Series-excited self-oscillating inductive power transfer (IPT) circuits exhibit a separation-insensitive property.
  • Existing analyses often involve explicit frequency determination, which can be complex.

Purpose of the Study:

  • To present an alternative derivation of the separation-insensitive property using network theory.
  • To extend the separation-insensitivity principle to shunt-excited IPT links.
  • To analyze the impact of circuit configurations on performance.

Main Methods:

  • Network theory-based derivation without explicit frequency calculation.
  • Extension of the separation-insensitivity principle to shunt-excited configurations.
  • Analysis of primary and secondary resonator element configurations (series vs. parallel).

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Main Results:

  • A theoretical voltage transfer function of unity is achieved in shunt-excited links when the coupling factor exceeds the reciprocal of the secondary quality factor.
  • Inclusion of a series resistor in the primary capacitive arm is necessary for this unity transfer.
  • Replacing series RC elements with parallel forms offers a convenient output impedance.
  • Experimental validation confirms separation-insensitivity occurs when the coupling factor exceeds the reciprocal of the loaded secondary quality factor.

Conclusions:

  • The network theory approach provides an effective method for analyzing separation-insensitivity in IPT circuits.
  • Shunt-excited links can achieve robust performance with appropriate circuit design.
  • Circuit component configuration significantly impacts output impedance and overall performance.