A Paradoxical Approach to Enhance the Output Power of Vibrational Energy Harvester Beyond the Impedance Matching Conditions
A Paradoxical Approach to Enhance the Output Power of Vibrational Energy Harvester Beyond the Impedance Matching Conditions
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DOI：
10.1109/mems46641.2020.9056419
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发表时间：
2020-01
期刊：
影响因子：
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通讯作者：
H. Honma;Y. Tohyama;H. Toshiyoshi
中科院分区：
文献类型：
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作者：
H. Honma;Y. Tohyama;H. Toshiyoshi
经典电路理论告诉我们，当负载电阻设置为与电源的内部阻抗匹配时，发电机的输出最大化。对于给定的电源系统，存在且仅存在一个阻抗匹配条件。然而，在本文中，我们发现了另一个最佳条件，特别是当机械-电转换效率提高驻极体振动能量收集装置。发现这样的条件比传统的匹配条件提供更多的功率。换句话说，阻抗匹配条件不是系统的唯一解，而是随着能量采集器的激励幅度而变化。
The classical circuit theory tells us that the output from a power generator is maximized when a load resistance is set to match with the internal impedance of the power source. It is also believed that there exists one and only one impedance matching condition for a given power source system. In this paper, however, we discover another optimal condition that arises particularly when the mechano-electric conversion efficiency is enhanced in the electret based vibrational energy harvesting device. Such a condition is found to deliver more power than the conventional matching conditions do. In other words, the impedance matching condition is not a unique solution for the system but it changes with the excitation amplitude to the energy harvester.