压电直流无线能量传输系统研究

Research on piezoelectric direct current wireless power transfer system

在很多工程应用中存在工作于密闭金属容器内的电子器件或系统,为对其进行电能供应并与之进行数据交互,传统的方法多是对容器做物理穿透。阐述了一种无线的方法,利用压电换能器产生和接收超声波,穿透金属进行能量传输,这样就保证了容器物理结构的完整性,从而较传统方法具有稳定性好、安全性高、维护成本低等优点。讨论了双端口阻抗匹配的方法,系统的硬件设计和构成,并给出了系统的实际性能测试结果。测试证明,穿透15 mm厚的钢板,系统可以稳定传输最大5 W的直流能量,最高传输效率约为16.6%,并仍有可提升的空间。

In numerous applications, there are electronic devices or systems which work in hermetically sealed metal enclo- sures. Traditionally, people have to perforate the enclosures in order to power the devices or systems inside, and communi- cate with them. A wireless method which utilizes piezoelectric transducers to transfer electricity through metal enclosures by transmitting and receiving ultrasound is presented. The physical structures of the enclosures are remained complete, which makes this method more stable., safer, and lower costing than the traditional ways. Conjugate impedance matching method is analyzed, as well as the power transfer hardware, and the experimental results of the system. The experiments prove that the system can deliver maximum 5 watts direct current electricity through a piece of 15 mm thick steel plate with highest 16.6% efficiency. There is still room for improvement.