非线性压电振动能量采集器与非线性接口转换电路的耦合动力学特性研究  

Harmonic analysis of coupling dynamics between the nonlinear piezoelectric vibration energy harvester and the nonlinear power extraction circuits

作　　者：朱强国 王光庆[1,2] 刘周龙 郑友成 周铄 Zhu Qiangguo;Wang Guangqing;Liu Zhoulong;Zheng Youcheng;Zhou Shuo(School of Information and Electronic Engineering,Zhejiang Gongshang University,Hangzhou 310018,China;Sussex Artificial Intelligence Institute,Zhejiang Gongshang University,Hangzhou 310018,China)

机构地区：[1]浙江工商大学信息与电子工程学院,杭州310018 [2]浙江工商大学萨塞克斯人工智能学院,杭州310018

出　　处：《仪器仪表学报》2022年第9期178-192,共15页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(51777192);浙江省自然科学基金(LY20E070001)项目资助。

摘　　要：压电振动能量采集器是实现低功耗电子产品无线自供电的核心部件,其与非线性接口转换电路的耦合机理是提升无线自供电系统输出性能的关键理论。以非线性三稳态压电振动能量采集器及其4种非线性接口转换电路为对象,建立动力学模型,利用谐波平衡方法求解不同接口电路下系统耦合动态响应的稳态解;仿真分析了系统参数对接口电路输出特性的影响。研究结果表明,当机电耦合系数较小时,串联同步电感开并接口电路(S-SSHI)适合于频率小于7 Hz、负载电阻小于7.4×10^(6)Ω的场合,而并联同步电感开关接口电路(P-SSHI)则相反;当机电耦合系数较大时,直流电(DC)电路具有优势,功率达到4.5×10^(-3)mW;交流电(AC)电路和DC电路具有较宽的机电耦合系数范围,而P-SSHI电路和S-SSHI电路却较窄但输出功率高,最大输出功率可达到19.0×10^(-3)和14.3×10^(-3)mW。实验验证了仿真结果的正确性。Piezoelectric vibration energy harvester is the important component of wireless self-power supply for low-power electronic products,and its coupling mechanism with nonlinear power extraction circuit is the key theory to improve the output performance of the wireless self-power supply system.Taking the nonlinear tristable piezoelectric vibration energy harvester and four different power extraction circuits as the object,the coupling dynamic model of the presented system is firstly formulated,and the steady state solutions of the coupled dynamic response of the system under different interface circuits are obtained by using the harmonic balance method.The effects of system parameters on the output characteristics of the interface circuit are simulated and analyzed.Results show that when the electromechanical coupling coefficient is too small,the S-SSHI circuit is suitable for occasions with frequency less than 7 Hz and load resistance less than 7.4×10^(6)Ω,while P-SSHI circuit is opposite.The DC circuit has advantages when electromechanical coupling coefficient is too large,and the output power is 4.5×10^(-3)mW.AC and DC circuits have a wide range of electromechanical coupling coefficients,while P-SSHI and S-SSHI circuits have a narrow range but have high output power,and the maximum output power can reach 19.0×10^(-3)and 14.3×10^(-3)mW.The simulation results are verified by experiments.

关 键 词：无线自供电 压电振动能量采集器 谐波平衡法 非线性电路 耦合动力学特性 

分 类 号：TH825[机械工程—仪器科学与技术]