Ultralow Power, Fully Autonomous Boost Rectifier for Electromagnetic Energy Harvesters
Ultralow Power, Fully Autonomous Boost Rectifier for Electromagnetic Energy Harvesters
复制标题
DOI：
10.1109/tpel.2012.2219594
复制
发表时间：
2013-07
影响因子：
6.7
通讯作者：
G. Szarka;S. Burrow;B. Stark
中科院分区：
文献类型：
--
作者：
G. Szarka;S. Burrow;B. Stark
本文介绍了一种用于振动能量采集器的完整功率调节系统，该系统可在超低功率水平下运行。功率调节系统，实现了分立元件，是自启动和完全自主的，并基于全波升压整流器拓扑结构。该设计利用了采集器线圈的杂散电感，无需单独的电感器，并采用开环控制，将静态功率开销降至仅21 μW，同时仍从采集器提取84%的最大可用功率。的子系统，包括自启动电路的设计，进行了详细描述，它示出，需要仔细的有源器件的选择，以尽量减少损失。它是实验证明，功率转换器实现转换效率高达76%，在亚毫瓦级的功率水平，包括静态损耗。在0.9 mW时，整个系统效率达到65%的峰值，而在200 μW时仍达到51%。该系统在超低平均功率水平下高效运行的能力为进一步简化振动采集器并将其部署到振动水平低于目前可能的环境中开辟了新的可能性。
In this paper, a complete power conditioning system for a vibration energy harvester is presented that operates at ultralow power levels. The power conditioning system, implemented with discrete components, is self-starting and fully autonomous, and based upon a full-wave boost rectifier topology. The design utilizes the stray inductance of the harvester's coil, eliminating the need for separate inductors, and employs open-loop control that reduces the quiescent power overhead to just 21 μW, while still extracting 84% of the maximum available power from the harvester. The design of the subsystems, including self-start circuitry, is described in detail, and it is shown that careful active device selection is required to minimize losses. It is experimentally demonstrated that the power converter achieves conversion efficiencies of up to 76% at submilliwatt power levels, including quiescent losses. The overall system efficiency peaks at 65% at 0.9 mW, while still achieving 51% at 200 μW. The ability of this system to operate efficiently at ultralow average power levels opens up new possibilities to further miniaturize vibration harvesters and deploy them into environments with lower vibration levels than is currently possible.