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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Consideration of Impedance Matching Techniques for Efficient Piezoelectric Energy Harvesting
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Consideration of Impedance Matching Techniques for Efficient Piezoelectric Energy Harvesting

机译：高效压电能量收集的阻抗匹配技术的考虑

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摘要

This study investigates multiple levels of impedance-matching methods for piezoelectric energy harvesting in order to enhance the conversion of mechanical to electrical energy. First, the transduction rate was improved by using a high piezoelectric voltage constant (g) ceramic material having a magnitude of g33 = 40 times 10-3 V m/N. Second, a transducer structure, cymbal, was optimized and fabricated to match the mechanical impedance of vibration source to that of the piezoelectric transducer. The cymbal transducer was found to exhibit ~40 times higher effective strain coefficient than the piezoelectric ceramics. Third, the electrical impedance matching for the energy harvesting circuit was considered to allow the transfer of generated power to a storage media. It was found that, by using the 10-layer ceramics instead of the single layer, the output current can be increased by 10 times, and the output load can be reduced by 40 times. Furthermore, by using the multilayer ceramics the output power was found to increase by 100%. A direct current (DC)-DC buck converter was fabricated to transfer the accumulated electrical energy in a capacitor to a lower output load. The converter was optimized such that it required less than 5 mW for operation.
机译：这项研究调查了用于压电能量收集的多级阻抗匹配方法，以增强机械能到电能的转换。首先，通过使用幅度为g33 = 40乘以10-3 V m / N的高压电电压常数（g）陶瓷材料来提高转导率。其次，优化并制造了一种换能器结构c，以使振动源的机械阻抗与压电换能器的机械阻抗相匹配。换能器的有效应变系数比压电陶瓷高40倍。第三，考虑用于能量收集电路的电阻抗匹配，以允许将产生的功率传输到存储介质。已经发现，通过使用10层陶瓷而不是单层陶瓷，可以将输出电流增加10倍，并且可以将输出负载减少40倍。此外，通过使用多层陶瓷，发现输出功率增加了100％。制造了直流（DC）-DC降压转换器，以将电容器中累积的电能转移到较低的输出负载。对转换器进行了优化，以使其运行所需的功率小于5 mW。

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