Wireless Power Transfer for Biomedical Application

Abstract

In the modern world, many electronic devices like smartphones, computer mouses and even implanted biomedical devices can be powered up wirelessly. The aim of this study is to optimize the transmitter and receiver ratio so that the power of 100mW can be transmitted safely between the transmitter and receiver and the generated magnetic flux from the transmitter does not exceed the 2010 ICNIRP general public magnetic flux density exposure level standard of 27 uT for the frequency range of 3-10 MHz, as our system is being operated at 6.78 MHz. Hence, this paper presents a resonance-based wireless power delivery system for powering up implanted biomedical devices. The advantage of wirelessly powering up implanted biomedical devices is that it will not be required to frequently change batteries or have inconvenient and unsafe wired connections. The system being proposed in this paper used three coils in total, including two large transmitting Helmholtz coils and a small receiving coil which will be implanted in the body of an experimental mouse in future work. We have done analytical calculations by using MATLAB and then have verified the calculations by a Finite Element Simulation software like COMSOL Multiphysics. An experimental prototype has also been built to verify the simulation result. All of the experimental results are presented and discussed in this paper. Moreover, all of these investigations will lay the foundation for understanding how to efficiently minimize the transmitter size, as the receiver size being used in our set up is bounded by the animal's head size.