Simulation and Design of wireless energy transmission for implantable micro-electromechanical devices

摘要

The purpose of this study is to describe a novel topologic technology for wireless power transmitting through external coils to multiple implantable micro-electromechanical devices inside the patient body, which is able to solve the dilemma of recharging. Wireless power transmitters are designed based on class π-type topologic structure, which improves existing Class-E power amplifier structure and impedance matching technology. Mathematical Models based on resonating chopper MOSFET and class π-type impedance matching network are introduced to optimize the design parameters. Together with proper capacitors and high-flux, low-loss inductors, an optimal wireless power transmitter with significant characteristics of high efficiency and low loss takes advantage of this brand new type of topologic structure. The author designed and developed the RF oscillator and the actual class E power resonant amplifier. During studies, with the 12 V power supply, the voltage of 96.8 V is generated on the 50 ohm high-power RF load side, along with source current of 2.183 A. The efficiency of the system reaches 89.4%, which satisfied the need for implantable micro-electromechanical device.