一种压电换能器热释电防护电路设计  

Design of Pyroelectric Protection Circuit for Piezoelectric Transducer

作　　者：李世国[1] 潘灿 赵德峰 母江东[1,2] 李军 何知益[2] LI Shiguo;PAN Can;ZHAO Defeng;MU Jiangdong;LI Jun;HE Zhiyi(The 26th Institute of China Electronics Technology Group Corporation,Chongqing 400060,China;CETC Chips Technology Inc.,Chongqing 401332,China;Yunnan Radio Co.Ltd.,Kunming 650223,China)

机构地区：[1]中国电子科技集团公司第二十六研究所,重庆400060 [2]中国电科芯片技术(集团)有限公司,重庆401332 [3]云南无线电有限公司,云南昆明650223

出　　处：《压电与声光》2024年第2期253-258,263,共7页Piezoelectrics & Acoustooptics

基　　金：重庆市技术创新与应用发展(军民融合专项(重点))手持式智能气象传感器研发与应用。

摘　　要：该文探讨了压电材料热释电效应产生的机理,得出压电换能器中压电陶瓷材料受温度变化会产生极化电荷,引起的热释电压会使压电换能器输出信号幅值增大,导致输出失效。因此针对热释电问题提出了两点解决方案。经过对比分析设计了一种ESD保护电路来解决热释电问题。该ESD保护电路通过设计一种改进型二极管钳位电路,针对压电换能器存在的极化电荷构建热释电释放环路,消除了热释电压对有用信号收发的影响。最后,通过对比实验验证了设计方案的可行性。This study explores the mechanism of the pyroelectric effect in piezoelectric materials and analyzes the polarization charge generated by temperature changes in the piezoelectric ceramic material employed in a piezoelectric transducer.It was observed that the resulting pyrovoltage heightened the output signal amplitude of the piezoelectric transducer,thereby compromising the output’s validity.Consequently,two solutions to mitigate the pyroelectric issue were investigated.Following a comparative analysis,an ESD protection circuit incorporating an enhanced diode clamp was devised.This circuit integrated a pyroelectric release loop to discharge the charge,effectively eliminating the impact of pyroelectric voltage on the transmission and reception of useful signals.Finally,the feasibility of the design scheme was verified by comparative experiments.

关 键 词：压电换能器 热释电效应 信号幅值增大 ESD保护电路 改进型二极管钳位电路 

分 类 号：TN384[电子电信—物理电子学]