Adaptive piezoelectric energy harvesting circuit for wireless remote power supply
Adaptive piezoelectric energy harvesting circuit for wireless remote power supply
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DOI：
10.1109/tpel.2002.802194
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发表时间：
2002-09-01
影响因子：
6.7
通讯作者：
Lesieutre, GA
中科院分区：
文献类型：
--
作者：
Ottman, GK;Hofmann, HF;Lesieutre, GA
本文描述了一种从机械激发的压电元件中收集电能的方法。振动压电装置不同于典型的电源，因为它具有电容性而不是感性源阻抗，并且可以由不同振幅的机械振动驱动。推导了整流压电器件最优功率流的解析表达式，并提出了一种能实现最优功率流的“能量收集”电路。收集电路由带输出电容的交流-直流整流器、电化学电池和控制进入电池的能量流的开关模式dc-dc转换器组成。采用自适应控制技术对dc-dc变换器进行连续实现最优功率传输理论，使电池存储的电量最大化。实验结果表明，与不使用dc-dc转换器相比，使用自适应dc-dc转换器可使功率传输增加400%以上。
This paper describes an approach to harvesting electrical energy from a mechanically excited piezoelectric element. A vibrating piezoelectric device differs from a typical electrical power source in that it has a capacitive rather than inductive source impedance, and may be driven by mechanical vibrations of varying amplitude. An analytical expression for the optimal power flow from a rectified piezoelectric device is derived, and an "energy harvesting" circuit is proposed which can achieve this optimal power flow. The harvesting circuit consists of an ac-dc rectifier with an output capacitor, an electrochemical battery, and a switch-mode dc-dc converter that controls the energy flow into the battery. An adaptive control technique for the dc-dc converter is used to continuously implement the optimal power transfer theory and maximize the power stored by the battery. Experimental results reveal that ' use of the adaptive dc-dc converter increases power transfer by over 400 % as compared to when the dc-dc converter is not used.