冲击激励式压电俘能器的接口电路设计  

Design of Interface Circuit for Piezoelectric Energy Harvester Under Shock Excitations

作　　者：肖泽坤 董维杰[1] XIAO Zekun;DONG Weijie(School of Electrical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学电气工程学院,辽宁大连116024

出　　处：《压电与声光》2024年第3期356-361,共6页Piezoelectrics & Acoustooptics

基　　金：国家重点研发计划基金资助项目(2019YFB2005900)。

摘　　要：设计了一种自供能同步非对称电压翻转及电荷提取电路(SP-SAFCE),其在压电俘能器电压正峰值完全翻转,在负峰值将能量完全提取,结合了并联同步开关电感电路和同步电荷提取电路的特点。相比于传统的压电接口电路,SP-SAFCE具有自供能的峰值检测模块和开关、无整流桥、无需阻抗匹配等优势。在拨动频率和磁铁间距离变化条件下进行对比实验,实验表明,在相同冲击激励下,SP-SAFCE电路的工作电压比同步电荷提取电路低0.8 V,输出功率约为同步电荷提取电路的1.15倍,适合作为冲击激励式压电俘能器的接口电路。In this study,a self-powered synchronous asymmetric voltage flip and charge extraction(SP-SAFCE)circuit is designed.The circuit combines the features of parallel synchronized switch harvesting on inductor and synchronous electric charge extraction to achieve a function that completely flips the voltage polarity at positive peaks and completely extracts charge at negative peaks.Compared with conventional piezoelectric interface circuits,the SPSAFCE circuit has the advantages of a self-powered peak detection module and switch,no rectifier bridge,and no requirement of impedance matching.Comparison experiments are conducted under varying conditions of driving frequency and distance between magnets.It is proved that under the same shock excitations,the SP-SAFCE circuit operates at a voltage 0.8 V lower than that of the synchronous electric charge extraction circuit,and its output power is approximately 1.15 times that of the synchronous charge electric extraction circuit,which makes it suitable for use as the interface circuit for a piezoelectric harvester under shock excitations.

关 键 词：压电能量收集 接口电路 冲击激励 无整流桥 自供能 无需阻抗匹配 

分 类 号：TN384[电子电信—物理电子学] TN702