摘要
分析了压电换能器夹持电容在线测量原理,提出了一种新的并联谐振频率跟踪方法。讨论了不同状态下并联谐振频率的变化规律。采用嵌入式芯片PSoC5为主控制器,结合数字合成技术,使激励信号分辨率达到0.5Hz。驱动直流电源采用软开关技术实现电压可调功能。对换能器的电压和电流进行检测并在此基础上实现扫频跟踪策略及自动解锁控制。在不同工作状态下的实验结果验证了设计方案的合理性。
A new method for tracking the parallel resonant frequency of a piezoelectric transducer driving system is proposed in this paper.First,the online measuring principle of the clamping capacitance of piezoelectric transducer is analyzed.Then,the variation of the parallel resonant frequency under different load and temperature is discussed.The resolution of the exciting signal is up to 0.5Hz by using the embedded chip PSoC5 as the main controller and combining the digital synthesis technology.The driving DC power supply adopts soft switching technology for an adjustable voltage.Finally,the sweeping frequency tracking strategy and the automatic unlock control are realized based on the detection of the voltage and current of the transducer.The rationality of the design has been verified by the experimental results under different working conditions.
出处
《压电与声光》
CSCD
北大核心
2017年第4期506-509,共4页
Piezoelectrics & Acoustooptics
基金
国家重点基础研究发展计划("973"计划)基金资助项目(2015CB057503)
关键词
压电换能器
夹持电容
数字合成技术
软开关技术
频率跟踪
piezoelectric transducer
clamping capacitance
digital synthesis technology
soft switching technology
frequency tracking
