A Wirelessly Rechargeable AA Battery Using Electrodynamic Wireless Power Transmission
A Wirelessly Rechargeable AA Battery Using Electrodynamic Wireless Power Transmission
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DOI：
10.3390/en14092368
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发表时间：
2021-04
期刊：
影响因子：
3.2
通讯作者：
S. E. Smith;M. A. Halim;S. Chyczewski;Adrian A. Rendon-Hernandez;D. Arnold
中科院分区：
文献类型：
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作者：
S. E. Smith;M. A. Halim;S. Chyczewski;Adrian A. Rendon-Hernandez;D. Arnold
我们报告了原型的设计、制造和表征，该原型满足家用 1.5 V AA 电池的形状、安装和功能，但无需从主机设备上取下即可进行无线充电。该原型系统包括低频电动无线电力传输 (EWPT) 接收器、锂聚合物储能电池和电源管理电路 (PMC)，全部包含在 3D 打印封装内。 EWPT 接收器和整个系统使用 238 Hz 正弦充电场和 1000 µF 电解电容器或锂聚合物 (LiPo) 电池作为存储单元进行实验表征。该系统展示了低至 50 µTrms 的最小工作磁场（与地球磁场的大小相似）。在此最小充电场下，原型可向电容器传输 50 µA 的最大直流电流，相当于 118 µW 的功率传输。电源管理系统的电源效率约为49%；功率效率定义为实际输出功率与 EWPT 接收器在给定场强下可以传输到纯电阻负载的最大可能功率之间的比率。
We report the design, fabrication, and characterization of a prototype that meets the form, fit, and function of a household 1.5 V AA battery, but which can be wirelessly recharged without removal from the host device. The prototype system comprises a low-frequency electrodynamic wireless power transmission (EWPT) receiver, a lithium polymer energy storage cell, and a power management circuit (PMC), all contained within a 3D-printed package. The EWPT receiver and overall system are experimentally characterized using a 238 Hz sinusoidal magnetic charging field and either a 1000 µF electrolytic capacitor or a lithium polymer (LiPo) cell as the storage cell. The system demonstrates a minimal operating field as low as 50 µTrms (similar in magnitude to Earth’s magnetic field). At this minimum charging field, the prototype transfers a maximum dc current of 50 µA to the capacitor, corresponding to a power delivery of 118 µW. The power effectiveness of the power management system is approximately 49%; with power effectiveness defined as the ratio between actual output power and the maximum possible power the EWPT receiver can transfer to a pure resistive load at a given field strength.