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access icon free Analysis and behavioural modelling of matching networks for resonant-operating capacitive wireless power transfer

  • Author(s): Eli Abramov 1 ; Jose Marcos Alonso 2 ; Mor Mordechai Peretz 1
    • View affiliations
  • Source: Volume 12, Issue 10, 28 August 2019, p. 2615 – 2625
    DOI:  10.1049/iet-pel.2018.6136 , Print ISSN 1755-4535, Online ISSN 1755-4543
© The Institution of Engineering and Technology
Received 23/10/2018, Accepted 17/01/2019, Revised 07/01/2019, Published 18/01/2019

This study introduces a two-port network-based behavioural modelling approach for resonant-operated capacitive wireless power transfer (WPT) systems. A simple, generic and unified modelling approach is developed to describe the behaviour of WPT systems, under changes of the source and load circuits, variations of the coupling interface and drifts of the components in the matching networks. The resultant model provides insights into the electrical cross-coupling relationships between input and output parameters of the capacitive power transfer systems, including the effect of distance and alignment of the coupling plates. Regardless of the circuit complexity, it is demonstrated that the model core can be reduced to a basic gyrator relationship with added coefficients when required, thus obtaining a compact, closed-form relationship between the input and output. To provide a simulation framework for capacitive medium variations, a simulation-compatible model of the capacitive coupling using a continuous-time variable capacitor has been constructed. The behavioural model and methodology have been validated through simulations and experiments. A 200 W experimental capacitive WPT prototype has been designed and examined for various air-gaps up to 100 mm at a resonant operation of 1.56 MHz. A very good agreement is obtained between the theoretical predictions, simulations, and experimental results.

Inspec keywords: power capacitors; circuit complexity; inductive power transmission; air gaps

Other keywords: frequency 1.56 MHz; circuit complexity; matching networks; capacitive power transfer systems; resultant model; closed-form relationship; resonant-operating capacitive wireless power transfer; output parameters; load circuits; experimental capacitive WPT prototype; capacitive coupling; WPT systems; size 100.0 mm; two-port network-based behavioural modelling approach; resonant-operated capacitive wireless power transfer systems; coupling interface; source circuits; coupling plate distance; capacitive medium variations; simulation-compatible model; resonant operation; coupling plate alignment; electrical cross-coupling relationships; power 200.0 W; input parameters; unified modelling approach; behavioural model; basic gyrator relationship; continuous-time variable capacitor

Subjects: Protection apparatus; Other power apparatus and electric machines; Wireless power transmission; Electromagnetic induction

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