A Frequency Control Method for Regulating Wireless Power to Implantable Devices

TLDR

Wireless power for implantable devices must cope with large coupling variations between internal and external systems. The study proposes regulating wireless power transfer by tuning the primary converter’s resonant frequency. The method adjusts frequency by varying tuning capacitance via soft‑switched phase control. The approach maintains power regulation across load, coupling, and circuit variations, and experiments confirm its effectiveness.

Abstract

This paper presents a method to regulate the power transferred over a wireless link by adjusting the resonant operating frequency of the primary converter. A significant advantage of this method is that effective power regulation is maintained under variations in load, coupling and circuit parameters. This is particularly important when the wireless supply is used to power implanted medical devices where substantial coupling variations between internal and external systems is expected. The operating frequency is changed dynamically by altering the effective tuning capacitance through soft switched phase control. A thorough analysis of the proposed system has been undertaken, and experimental results verify its functionality.