压电超声换能器的阻抗匹配分析

Analysis on the Matching Impedance of Piezoelectric Ultrasonic Transducer

介绍了压电超声换能器在串、并联谐振时的等效电路,并对换能器工作在两种谐振频率时的实时跟踪和工作性能进行了详细分析,通过对换能器的外部LC串联匹配分析和相应的阻抗匹配变换,提出了压电超声换能器在并联谐振角频率附近,具有很好的功率自动调节性能。

The equivalent circuit of the piezoelectric ultrasonic transducer in series, parallel resonant of the transducer is introduced. The in-time tracking and working characteristics work in the two resonant frequencies are analyzed in detail. Through the external LC series matching analysis of the transducer and the corresponding impedance matching transformation, the piezoelectric ultrasonic transducer shows good performance of automatic regulation with power at near parallel resonant angular frequency.