Design and implementation of dual-mode inductors for dual-band wireless power transfer systems

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Abstract

We propose a dual-band wireless power transfer (WPT) system employing a dual-mode inductor. The dual-mode inductor is possible through enforcing a self-resonance condition by loading an inductor in series by a tank circuit. In return, two distinct resonances are achieved, simultaneously, utilizing a single compensation capacitor as the inductance of the dual-mode inductor appears with a smaller value after its self-resonance. Also, by maintaining the same mutual coupling, the coupling coefficient becomes larger at the higher resonance, which allows for the employment of the same source/load admittance inversion network to achieve maximum power transfer at both of the operating frequency bands, concurrently. We verify the operation by fabricating a dual-band WPT system, which shows measured efficiencies of 70% and 69% at 90.3 MHz and 138.8 MHz, correspondingly. The size of the WPT system is \boldsymbol {50} \boldsymbol {\times } \boldsymbol {50} mm ^{\boldsymbol {2}} and has a transfer distance of 40 mm.

Original languageEnglish
Article number8546792
Pages (from-to)1287-1291
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume66
Issue number8
DOIs
Publication statusPublished - Aug 1 2019

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Inductance
Frequency bands
Capacitors
Networks (circuits)
Compensation and Redress

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

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title = "Design and implementation of dual-mode inductors for dual-band wireless power transfer systems",
abstract = "We propose a dual-band wireless power transfer (WPT) system employing a dual-mode inductor. The dual-mode inductor is possible through enforcing a self-resonance condition by loading an inductor in series by a tank circuit. In return, two distinct resonances are achieved, simultaneously, utilizing a single compensation capacitor as the inductance of the dual-mode inductor appears with a smaller value after its self-resonance. Also, by maintaining the same mutual coupling, the coupling coefficient becomes larger at the higher resonance, which allows for the employment of the same source/load admittance inversion network to achieve maximum power transfer at both of the operating frequency bands, concurrently. We verify the operation by fabricating a dual-band WPT system, which shows measured efficiencies of 70{\%} and 69{\%} at 90.3 MHz and 138.8 MHz, correspondingly. The size of the WPT system is \boldsymbol {50} \boldsymbol {\times } \boldsymbol {50} mm ^{\boldsymbol {2}} and has a transfer distance of 40 mm.",
author = "Adel Barakat and Kuniaki Yoshitomi and Ramesh Pokharel",
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AU - Barakat, Adel

AU - Yoshitomi, Kuniaki

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N2 - We propose a dual-band wireless power transfer (WPT) system employing a dual-mode inductor. The dual-mode inductor is possible through enforcing a self-resonance condition by loading an inductor in series by a tank circuit. In return, two distinct resonances are achieved, simultaneously, utilizing a single compensation capacitor as the inductance of the dual-mode inductor appears with a smaller value after its self-resonance. Also, by maintaining the same mutual coupling, the coupling coefficient becomes larger at the higher resonance, which allows for the employment of the same source/load admittance inversion network to achieve maximum power transfer at both of the operating frequency bands, concurrently. We verify the operation by fabricating a dual-band WPT system, which shows measured efficiencies of 70% and 69% at 90.3 MHz and 138.8 MHz, correspondingly. The size of the WPT system is \boldsymbol {50} \boldsymbol {\times } \boldsymbol {50} mm ^{\boldsymbol {2}} and has a transfer distance of 40 mm.

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