A rotating-magnet based wireless electrical power transfer for biomedical implants

Transformer-based inductively coupled near-field wireless links have been extensively studied in the past three decades as a means of transferring power to implanted biomedical devices. Even with deliberative optimizations, the reported maximum transferred power is limited to 275 mW over 1-cm. In this paper, a novel wireless power transfer link is described that uses a rotating magnet to transfer power. The rotating-magnet-based power transfer link is able to deliver 678 mW over a 1-cm distance wirelessly. The advantages of this new method are briefly analyzed by comparing with the existing transformer-based power transfer links.