Miniature Implantable Wireless Energy Transmission System

Over the last decade, implantable electronic devices have developed rapidly. However there are still some problems such as power supply, size and bio-compatibility. Wireless energy transfer technology has significant advantages in solving these problems. Compared with traditional inductive coupling systems, Wireless magnetic resonant energy transfer system shows more superiority in energy transfer efficiency and relative position parameters. A system using resonant coupling can be nearly omnidirectional and efficient, with low losses in environmental objects and independence of the geometry of the surrounding space.This thesis proposed two design methods for 3D Flexible Overlapping Double Coils (3D-FODCs). One method utilizes Polyimide material to design PCB 3D-FODCs. By theoretical analyzing and discussing the inductance, AC resistance, capacitance and quality factor values collected from the impedance analyzer, this thesis analyzed the number of strands and turns of coils for the assessment of the influence of coil performance. The S parameters based on four coils transfer system were measured by network analyzer and the transfer efficiency was calculated. Another method utilizes Parylene material with excellent bio-compatibility to design 3D-FODCs of different parameters, followed by designing the fabrication process of harmonic oscillator. The harmonic oscillator of double-sided pads was obtained by thermal release tape. The preliminary experiment results of the tape-out process was recorded and analyzed. Finally, A Class-E amplifier with an inverter driver was designed as the transmitter. The rectifier and regulator circuit which comprised the receiver provided a regulated output.This thesis studied on the wireless magnetic resonant energy transfer technology of miniature implantable electronic device.3D-FODCs was designed in two different methods, followed by measuring related data. The wireless energy transfer system was built up by two identical 6mm diameters PCB 3D-FODCs. The maximum energy transfer efficiency reaches 21.24% and the corresponding output voltage is 1.477V at the working frequency of 13.56 MHz under certain conditions. A wireless energy transfer system with small size and excellent power supply performance was achieved, which is important for the development of miniature implantable electronic device.