A chip-sized piezoelectric receiver for low-frequency, near-field wireless power transfer: design, modeling and experimental validation
A chip-sized piezoelectric receiver for low-frequency, near-field wireless power transfer: design, modeling and experimental validation
复制标题
DOI：
10.1088/1361-665x/abe60f
复制
发表时间：
2021-04-01
影响因子：
4.1
通讯作者：
Arnold, David P.
中科院分区：
文献类型：
--
作者：
Halim, Miah A.;Rendon-Hernandez, Adrian A.;Arnold, David P.
这项工作介绍了用于低频近场无线电力传输的芯片大小的压电接收器的设计、建模和表征。利用激光微加工的钛悬浮，一个钕铁硼磁铁，和两个PZT-5A压电陶瓷贴片，接收器在其扭转模式机械谐振。设计了两个单压电晶片压电陶瓷换能器，以最大限度地提高接收器的功率密度，同时保持低频电动无线功率传输的低机械谐振频率。一个等效的集总元件电路模型被用来模拟系统的性能。制作、组装并测试了一个原型器件，并将实验结果与系统模型进行了比较。0.08 cm（3）器械在距离发射器线圈1 cm处产生的最大平均功率为360 mu W，发射器线圈工作频率为724 Hz，低于人体头部和躯干暴露限值。该数据对应于4.2mW cm（-3）功率密度。总的来说，这种体积高效的设计为潜在的无线充电可穿戴和生物植入式设备提供了一个低轮廓和紧凑的足迹。
This work presents the design, modeling and characterization of a chip-sized piezoelectric receiver for low-frequency, near-field wireless power transmission. Utilizing a laser micro-machined titanium suspension, one NdFeB magnet, and two PZT-5A piezo-ceramic patches, the receiver operates at its torsion mode mechanical resonance. Two unimorph piezo-ceramic transducers are designed to maximize the power density of the receiver while maintaining a low mechanical resonant frequency for low-frequency electrodynamic wireless power transmission. An equivalent lumped-element circuit model is used to model the system performance. A prototype device is fabricated, assembled and tested, and the experimental results are compared with the system model. The 0.08 cm(3) device generates a maximum of 360 mu W average power at 1 cm distance from a transmitter coil operating at 724 Hz and below human head and torso exposure limits. This data corresponds to 4.2 mW cm(-3) power density. Overall, this volume-efficient design offers a low-profile and compact footprint for potentially wirelessly charging wearable and bio-implantable devices.