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Controlling wireless power transfer by tuning and detuning resonance of telemetric devices for rodents

Published online by Cambridge University Press:  07 February 2020

Basem M. Badr*
Affiliation:
Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8W 2Y2, Canada
Art Makosinski
Affiliation:
Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8W 2Y2, Canada
Nikolai Dechev
Affiliation:
Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8W 2Y2, Canada
Kerry R. Delaney
Affiliation:
Department of Biology, University of Victoria, Victoria, BC, V8W 2Y2, Canada
*
Author for correspondence: Basem M. Badr, Department of Mechanical Engineering, University of Victoria, Victoria, BC, V8W 2Y2, Canada. E-mail: bbadr@uvic.ca

Abstract

Telemetry acquisition from rodents is important in biomedical research, where rodent behavior data is used to study disease models. Telemetry devices for such data acquisition require a long-term powering method. Wireless power transfer (WPT) via magnetic resonant coupling can provide continuous power to multiple small telemetric devices. Our loosely coupled WPT (LCWPT) system consists of a stationary primary coil and multiple freely moving secondary coils. Our previous LCWPT system was designed to transfer reasonable power to secondary coils at poor orientations but transfers excessively high amounts of power at favorable orientations. Reasonable power is needed for telemetry and radio electronics, but highly induced voltage on the secondary coil creates excess energy which must be dissipated by previous devices, and caused problems (localized heat damage and variations in component properties) leading to drift in operating frequency. To remedy these two problems, a novel scheme is proposed to automatically tune or detune the resonant frequency of the secondary circuit. Our closed-loop controlled tuning or detuning (CTD) approach can be used to prevent excessive power transfer by detuning, or to improve power transfer by tuning, depending on the need. Furthermore, this novel CTD scheme facilitates the use of multiple telemetric devices.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2020

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