Power Management Circuit for Wireless Sensor Nodes Powered by Energy Harvesting: On the Synergy of Harvester and Load
Power Management Circuit for Wireless Sensor Nodes Powered by Energy Harvesting: On the Synergy of Harvester and Load
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DOI：
10.1109/tpel.2018.2885827
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发表时间：
2019-09-01
影响因子：
6.7
通讯作者：
Zhu, Meiling
中科院分区：
文献类型：
--
作者：
Chew, Zheng Jun;Ruan, Tingwen;Zhu, Meiling
本文提出了一种自适应电源管理电路，可在实际应用中最大限度地提高从能量采集器到无线传感器节点的能量传输。电源管理电路采用低功耗技术，最大限度地将收集到的能量传递给负载，而不是被电路消耗。所提出的电路包含一个模拟控制电路（ACC），用于从能量采集器到存储电容器的最大功率传输，以及一个能量感知接口（EAI），用于控制从存储电容器到负载的能量流。为了评估所提出电路的性能，使用压电能量收集作为研究案例。压电能量收集器（PEH）在不同的应变载荷和频率下受到机械激励。实验结果表明，由于EAI和ACC具有微瓦级的低功耗，该电路可以自启动并直接由PEH供电。该电路适用于不同输出和各种电力负载的能量采集器，将采集的能量从 PEH 传输到存储电容器时的峰值效率为 76.18%。存储电容器释放的96%以上的能量有效地转移到电气负载。
This paper presents an adaptive power management circuit, which maximizes the energy transfer from the energy harvester to wireless sensor nodes in real-world applications. Low power consumption techniques were adopted in the power management circuit to maximize the delivery of the harvested energy to the load instead of being consumed by the circuit. The presented circuit incorporates an analogue control circuit (ACC) for maximum power transfer from the energy harvester to the storage capacitor and an energy-aware interface (EAI) for controlling the energy flow from the storage capacitor to the load. To evaluate the performance of the presented circuit, piezoelectric energy harvesting was used as a studied case. The piezoelectric energy harvester (PEH) was mechanically excited at different strain loadings and frequencies. The experimental results show the circuit can self-start and powered directly by the PEH since the EAI and ACC have low power consumption in the range of microwatts. The circuit is adaptive to energy harvesters of varying output and various electrical loads, with a peak efficiency of 76.18% in transferring the harvested energy fromthe PEH to the storage capacitor. More than 96% of the energy released from the storage capacitor is effectively transferred to the electrical load.