Design of wireless charging system for energy harvest of implanted biomedical devices

Abstract

With ever-increasing concerns on health and environmental safety, there is a fast-growing interest in new technologies for medical devices and applications. Particularly, the wireless power transfer (WPT) technology provides a reliable and convenient power charging for implant medical devices without additional surgery. Expecting the implanted devices will be highly promoted in the future with the high-speed development of IoT. A system that could charge all embedded devices simultaneously is necessary and prospective. This project presents a wireless charging system for multiple biomedical implants. The design could greatly reduce the discomforts and risks of having battery replacement surgeries. The procedure of the Fdesign involves simulations and experiments which improve the accuracy of results. Both transmitter coil and receiver coil are designed as single coils with ferrite core which could effectively enhance the capability of power transmission while keeping the small size. Due to the concern of the complexity of transmitting media and the relatively small receiver, the operating frequency is set to be 595kHz. The system has a good tolerance in load variation, including increasing loads, horizontal misalignment, and rotation. Optimization and future development of a similar system are also discussed. The experiment results show that the proposed system could sufficiently transfer the energy to the receiver with current and voltage in the charging range of implanted biomedical devices.