Based on the magnetic resonance coupling principle, in this paper a wireless energy transfer system is designed and implemented for the power supply of micro-implantable medical sensors. The entire system is composed of the in vitro part, including the energy transmitting circuit and resonant transmitter coils, and in vivo part, including the micro resonant receiver coils and signal shaping chip which includes the rectifier module and LDO voltage regulator module. Transmitter and receiver coils are wound by Litz wire, and the diameter of the receiver coils is just 1.9 cm. The energy transfer efficiency of the four-coil system is greatly improved compared to the conventional two-coil system. When the distance between the transmitter coils and the receiver coils is 1.5 cm, the transfer efficiency is 85% at the frequency of 742 kHz. The power transfer efficiency can be optimized by adding magnetic enhanced resonators. The receiving voltage signal is converted to a stable output voltage of 3.3 V and a current of 10 mA at the distance of 2 cm. In addition, the output current varies with changes in the distance. The whole implanted part is packaged with PDMS of excellent biocompatibility and the volume of it is about 1 cm3.
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机译：基于磁共振耦合原理，本文设计并实现了一种无线能量传输系统，用于微植入式医疗传感器的电源供应。整个系统由体外部分（包括能量传输电路和谐振发射器线圈）和体内部分（包括微谐振接收器线圈）和信号整形芯片组成，信号整形芯片包括整流器模块和LDO稳压器模块。发射器线圈和接收器线圈由Litz线绕制而成，接收器线圈的直径仅为1.9厘米。与传统的两线圈系统相比，四线圈系统的能量传输效率大大提高。当发射线圈和接收线圈之间的距离为1.5 cm时，在742 kHz频率下的传输效率为85％。可以通过增加磁性增强谐振器来优化功率传输效率。接收电压信号在2 cm的距离处转换为3.3 V的稳定输出电压和10 mA的电流。另外，输出电流随着距离的变化而变化。整个植入部分均包裹有生物相容性极佳的PDMS，其体积约为1 cm 3 。
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