Optimal Design and Experimental Assessment of a Wireless Power Transfer System for Home-Cage Monitoring

Techniques of long-term in vivo electrophysiological recording play important roles in brain research and neural rehabilitation. To avoid interruption of experiment and risk of infection, use of wireless power transfer (WPT) technique has been suggested to eliminate cumbersome wires and batteries at...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2019-10, Vol.34 (10), p.9779-9793
Main Authors: Chow, Jeff Po-Wa, Chung, Henry Shu-Hung, Chan, Leanne Lai-Hang, Shen, Ruihua, Tang, Sai Chun
Format: Article
Language:English
Subjects:
Animals
Batteries
Brain
Coils
Coils (windings)
Degradation
Electrophysiological experiments
impedance matching circuit
In vivo methods and tests
Insulation life
magnetic flux density
Maximum power transfer
Operating zones
Receivers
Recording
Rehabilitation
Specific absorption rate
specific absorption rate (SAR)
Wireless power transfer
wireless power transfer (WPT)
Wireless power transmission
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Summary:Techniques of long-term in vivo electrophysiological recording play important roles in brain research and neural rehabilitation. To avoid interruption of experiment and risk of infection, use of wireless power transfer (WPT) technique has been suggested to eliminate cumbersome wires and batteries attached to the animals in rodent electrophysiological applications. This paper presents a holistic assessment of the relationships among the physical sizes of the transmitting and receiving coils, power transfer characteristics, and specific absorption rate (SAR) in animals of a simple WPT system using two rectangular coaxial transmitting coils. With given space for the animal and size of the receiving coil, a procedure for designing the minimum driving current, and the transmitting coil dimensions and separation to deliver sufficient power to the receiver, and interactions between the transmitting and receiving coils is derived. A π -capacitor network that can match the impedances of the receiving coil and the load to operate the receiver at the maximum power transfer condition is proposed. It is also optimized for the overall volume. A 100-mW prototype with an operating zone of 400 × 240 × 40 mm 3 and a receiving coil with a diameter of 11.45 mm is built and studied. The SAR in the animal is evaluated and compared with the recommended restriction level.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2019.2894182