A Resonant Current-Mode Wireless Power Receiver and Battery Charger With-32 dBm Sensitivity for Implantable Systems
A Resonant Current-Mode Wireless Power Receiver and Battery Charger With-32 dBm Sensitivity for Implantable Systems
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DOI：
10.1109/jssc.2016.2598224
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发表时间：
2016-12-01
影响因子：
5.4
通讯作者：
Sylvester, Dennis
中科院分区：
文献类型：
--
作者：
Choi, Myungjoon;Jang, Taekwang;Sylvester, Dennis
由于人体组织上的入射功率较低且接收器线圈尺寸较小，植入式系统的无线功率传输必须收集非常低的功率水平。这项工作提出了谐振电流模式充电，以降低最小可收集输入功率并提高低输入功率水平下的功率效率。这项工作避免了传统电压模式方法的整流和电压调节，而是使 LC 谐振回路谐振多个周期以积聚能量，然后直接用电感器电流为电池充电。原型机采用 0.18 μm CMOS 技术制造。最小可采集输入功率为 600 nW，输入功率为 4.2 mu W 时最大功率效率为 67.6%。经过测量，通过牛组织的电力传输效率损失可以忽略不计，使得该技术适合植入应用。
Wireless power transfer for implantable systems must harvest very low power levels due to low incident power on human tissues and a small receiver coil size. This work proposes resonant current-mode charging to reduce minimum harvestable input power and increase power efficiency at low input power levels. Avoiding rectification and voltage regulation from conventional voltage-mode methods, this work resonates an LC tank for multiple cycles to build up energy, then directly charges a battery with inductor current. A prototype is fabricated in 0.18 mu m CMOS technology. Minimum harvestable input power is 600 nW and maximum power efficiency is 67.6% at 4.2 mu W input power. Power transmission through bovine tissue is measured to have negligible efficiency loss, making this technique amenable to implantable applications.