Optimal Coil Design for Wireless Powering of Biomedical Implants Considering Safety Constraints

Abstract

This paper presents an investigation on the design of a transmit coil for a wireless power transfer system. The transmitter is optimized subject to an imposed safety limit for magnetic field exposure. Three cases are considered as follows: unconstrained, geometrically constrained and current constrained. Equations for determining design parameters for an optimal solenoid wireless power transmitter are found given either system size or current constraints. If a certain magnetic field strength is required, equations for the size and current of the transmitter are found that will allow the necessary fields without violating the safety constraint.