Design Considerations and Experimental Testing of a Wide-Area Inductive Power Transfer (IPT) System for Body-Worn Electronics

Author:

Burrow Steve1,Clare Lindsay1,Stark Bernard2,Beeby Steve3ORCID,Grabham Neil3ORCID

Affiliation:

1. School of Civil, Aerospace and Design Engineering, University of Bristol, Bristol BS8 1TR, UK

2. School of Electronic, Electrical and Mechanical Engineering, University of Bristol, Bristol BS8 1UB, UK

3. Electronics and Computer Science, University of Southampton, Southampton SO17 1BJ, UK

Abstract

The provision of wireless and battery-free power is key to extending the applications of body-worn sensing electronics. This paper investigates the design of an IPT system for a body-worn scenario where the challenges include highly variable coupling, the requirement for the coil/s to be flexible, and close proximity to the body. Variable coupling results in a system that must operate with received powers ranging over orders of magnitude, whilst the use of flexible coils reduces the Q-factor and results in the potential for inductance variation. The human exposure considerations limit both the maximum field strengths that the wearer of a receiver coil might experience and the field strengths that a third party might be exposed to. In this paper, analytical models are used to identify key design variables and to guide the design synthesis of an IPT system for a wrist-worn medical sensor. Practical circuits to drive the transmit coil and to interface the receive coil with the load electronics are described. A prototype system is tested to validate the theoretical analysis, providing power greater than 2 mW to the sensor over a hemispherical region up to 250 mm in radius from the transmit coil.

Funder

EPSRC

Publisher

MDPI AG

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