A hybrid indoor ambient light and vibration energy harvester for wireless sensor nodes.
A hybrid indoor ambient light and vibration energy harvester for wireless sensor nodes.
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DOI：
10.3390/s140508740
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发表时间：
2014-05-19
期刊：
影响因子：
--
通讯作者：
Wang W
中科院分区：
文献类型：
--
作者：
Yu H;Yue Q;Zhou J;Wang W
为了充分利用光和振动能量同时可用的应用，本文提出了一种混合室内环境光和振动能量收集方案。该方案仅使用一个功率调节电路来调节从两个能量源收集的组合输出功率，以降低功率耗散。为了更准确地预测太阳能电池板的瞬时功率，提出了一种适用于弱光环境下的小型太阳能电池板的改进五参数模型。利用MEMS压电悬臂梁阵列结构提高了输出电压。它克服了传统MEMS振动能量采集器输出电压低的缺点。利用模拟分立器件实现了室内环境光的最大功率点跟踪（MPPT），与数字信号处理器相比，大大提高了整个采集器的效率。利用阻抗匹配技术提高了振动能量采集器的输出功率。文中还讨论了一种有效的能量积累和释放机制。在4.8 × 2.0 cm 2非晶硅太阳能电池板和11 × 12.4 mm 2压电MEMS发电机上的实验结果表明，混合能量采集器的最大效率约为76.7%。
To take advantage of applications where both light and vibration energy are available, a hybrid indoor ambient light and vibration energy harvesting scheme is proposed in this paper. This scheme uses only one power conditioning circuit to condition the combined output power harvested from both energy sources so as to reduce the power dissipation. In order to more accurately predict the instantaneous power harvested from the solar panel, an improved five-parameter model for small-scale solar panel applying in low light illumination is presented. The output voltage is increased by using the MEMS piezoelectric cantilever arrays architecture. It overcomes the disadvantage of traditional MEMS vibration energy harvester with low voltage output. The implementation of the maximum power point tracking (MPPT) for indoor ambient light is implemented using analog discrete components, which improves the whole harvester efficiency significantly compared to the digital signal processor. The output power of the vibration energy harvester is improved by using the impedance matching technique. An efficient mechanism of energy accumulation and bleed-off is also discussed. Experiment results obtained from an amorphous-silicon (a-Si) solar panel of 4.8 × 2.0 cm2 and a fabricated piezoelectric MEMS generator of 11 × 12.4 mm2 show that the hybrid energy harvester achieves a maximum efficiency around 76.7%.
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