弱能量接收下的植入式医疗设备无线能量传输设计

Design of wireless power transfer for implantable medical devices in weak power receiving

为了提高经皮无线能量传输的耦合强度和接收端的电压输出能力,针对设备的弱能量接收,设计了具有倍压整流器的四线圈结构磁谐振耦合式无线能量传输系统.通过四线圈谐振能量传输结构,使能量在线圈间的传输隔离来自发射电路和接收电路的影响,从而提高传输电路的品质因数,并且提高系统的耦合系数.实验结果表明:设计结构使用10 mm接收线圈时可使设备在40 mm植入深度下能量传输效率达到15%以上,倍压整流器的输出纹波系数小于0.7%,这说明本文所设计的能量传输系统结构能够在弱能量接收下正常运行.

To enhance the coupling strength of wireless power transfer （WPT） via skin and the voltage output capability on receiver, a magnetically resonant coupled WPT with four-coils structure and rectifier doubler is designed, with an improved transmission efficiency. The experimental results showed that the power transfer efficiency can achieve higher than 15% in 40 mm implantable depth and 10 mm receiving coil using designed structure, and the output ripple factor of rectifier doubler is less than 0.7%.