An Electrodynamic Wireless Power Receiver ‘Chip’ for Wearables and Bio-implants
An Electrodynamic Wireless Power Receiver ‘Chip’ for Wearables and Bio-implants
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DOI：
10.1109/wow47795.2020.9291290
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
M. A. Halim;Adrian A. Rendon-Hernandez;D. Arnold
中科院分区：
文献类型：
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作者：
M. A. Halim;Adrian A. Rendon-Hernandez;D. Arnold
介绍了一种用于低频电动力无线功率传输(EWPT)的片式无线功率接收器的设计、制作和实验特性。利用激光微机械加工的弯曲悬架、一个NdFeB磁体和两个PZT-SA压电片，这个0.08cm3的微接收器工作在724赫兹的扭转模式机械谐振下。该器件在距离发射机线圈1厘米处产生平均功率(4.2mWcm−3功率密度)，工作频率为724赫兹，并且安全地在2 mTrms的允许人体暴露限值内。与之前报道的宏观规模原型相比，这款体积高效的微型接收器体积小31倍，在超薄、紧凑的占地面积内提供3.2倍的功率密度，适用于可穿戴设备和生物植入设备的无线充电。
This paper presents the design, fabrication and experimental characterization of a chip-sized wireless power receiver for low-frequency electrodynamic wireless power transmission (EWPT). Utilizing a laser micro-machined meandering suspension, one NdFeB magnet, and two PZT-SA piezoelectric patches, this 0.08 cm3 micro-receiver operates at its torsion mode mechanical resonance of 724 Hz. The device generates 360 µW average power (4.2 mWcm−3 power density) at 1 cm distance from a transmitter coil operating at 724 Hz and safely within allowable human exposure limits of 2 mTrms field. Compared to a previously reported macro-scale prototype, this volume-efficient micro-receiver is 31x smaller and offers 3.2x higher power density within a low-profile, compact footprint for wirelessly charging wearable and bio-implantable devices.