Strongly Coupled Magnetic Resonance based Wireless Power Transfer System for Implantable Medical Devices

The paper primarily investigates the power transfer efficiency (PTE) of a wireless power transfer (WPT) system for implantable medical devices. The intended WPT is based on strongly coupled magnetic resonance (SCMR) method, where the key emphasis is to maximize the PTE instead of minimizing the power consumption of implants. The operating frequency is planned at 13.56MHz, which is well indicated for the industrial, scientific, and medical band (ISM band). Using Keysight advanced design system (ADS) software, the prospective PTE performance was explored using a set of optimization approaches. In that, a parametric study of the WPT system was firstly introduced to preserve the optimum dimensions of system coils. Besides, an impedance matching was basically explored by tuning source and load resistors instead of expending complicated matching networks at both sides of the WPT system. Furthermore, identical transmitter-receiver coil was designed to attain a resonant frequency associating with the operating frequency. Moreover, multi-receiver coil was employed in place of a single one to inspect the potential frequency bandwidth alongside the PTE. Eventually, multi-transmitter coil was arranged to avoid the potential misalignment between the transmitter and receiver coils. As a consequence, the optimum performance in terms of the PTE was estimated in range of 90.6% at a lower coupling coefficient of 0.004 indicating a further distance.