Wireless Power Transfer for Biomedical Implants using Series–Parallel Spider-Web Coil Configuration

Abstract

Biomedical sensors and implants are regarded as a significant technology for improving the quality of healthcare, as they enable proactive illness management and ongoing monitoring of the patient vital signs. Like many other devices, they are restricted to a limited amount of energy, and this leads to a challenge in terms of the lifespan of the device. This study aims to address this issue by designing and implementing a wireless energy transmission system specifically designed for such devices. The proposed design is based on utilizing spider-web and the series–parallel configuration to provide sufficient energy transmission for the device. The model has been examined under various conditions, including changes to the transmission distance between coils, the source voltage level, and operating frequency. Examined performance metrics including the output DC voltage and power transfer, as well as the overall efficiency of power transfer, proving that the strategy is feasible. As many biomedical implants such as pacemakers required 5 volts to operate, the study target voltage was 5 V. Two source voltages (10, and 20 V) were demonstrated. The design was examined at six operating frequencies, ranging from 1.78 MHz to 6.78 MHz. The most acceptable results were achieved at 1.78 MHz. Power transfer efficiencies at a 10 mm transmission distance were 91.5% and 91.15% for source voltages of 10 V and 20 V, respectively. The proposed design demonstrates high efficiency which is appropriate for powering BMI wirelessly.