基于Matlab压电超声换能器匹配电路的研究

摘要

In order to obtain good vibration performance of ultrasonic vibrator, the efficient matching circuit must be designed. The single inductance and capacitance of the series and parallel matching circuit is studied. Using the method of equivalent circuit,matching circuit impedance formula is derived. According to the impedance formula,the different parameters of the impedance matching circuit characteristic curve are obtained by Matlab simulation platform. Through analyzing the impedance characteristic curve,the influence laws of matching circuit and parameters on system resonance frequency,impedance matching and electromechanical coupling coefficient are found out. The experimental results show that the simulation results are consistent with the experimental results. The conclusion provides some theoretical basis for design of matching circuits of piezoelectric transducer.%为了使超声振子获得良好的振动效果，必须设计高效的匹配电路。对单个电感、电容的串联和并联匹配电路进行了研究。利用等效电路法推导出匹配电路的阻抗公式，根据该公式，采用Matlab平台仿真得到不同参数的各匹配电路阻抗特性曲线。通过分析阻抗特性曲线得出匹配电路及匹配参数对系统谐振频率、阻抗及机电耦合系数的影响规律。实验结果表明院仿真结果与实验结果一致，所得结论为压电换能器匹配电路的设计提供了理论依据。