用锁相环电路跟踪压电换能器并联谐振频率区  

Tracking the fp region of the piezoelectric transducer by the phase-locked loop circuit

作　　者：鲍善惠[1] 

机构地区：[1]陕西师范大学应用声学研究所,西安710062

出　　处：《应用声学》2001年第3期1-5,共5页Journal of Applied Acoustics

摘　　要：本文在介绍用 ＰＬＬ（Ｐｈａｓｅ－Ｌｏｃｋｅｄ Ｌｏｏｐ锁相环）电路进行频率跟踪的原理和实质的基础上，给出一种能够跟踪压电换能器并联谐振频率ｆｐ区间的具体电路，并通过实验研究了匹配电感和负载等对电路跟踪性能的影响．结果表明，这个电路具有很好的频率跟踪和功率自动调节性能．Based on a discussion on the principle and essentiality of piezoelectric transducer's frequency tracking by the PLL circuit, a practical circuit for tracking the fp region is given. The effect of matching inductor and load on the circuit's tracking ca- pability was studied through experiment. The result shows that this circuit has a good performance in both frequency tracking and automatic power adjusting.

关 键 词：压电换能器 并联谐振频率区 频率跟踪 锁相环电路 超声换能器 

分 类 号：TB552[理学—物理]