| 李小雪,李平,汪东,肖灵.夹心式压电换能器的谐振频率跟踪方案设计[J].,2009,28(4):314-320 |
| 夹心式压电换能器的谐振频率跟踪方案设计 |
| Resonance frequency tracing scheme for sandwich piezoelectric transducer |
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| 中文摘要: |
| 分析了夹心式压电换能器的阻抗特性,讨论了基于相位方式的现有跟踪方案的不足,提出了一种新的频率跟踪方案,介绍了实现该方案的电路系统。该方案的特点是:采用先扫频后跟踪的策略,解决了频率范围设定难的问题;增加解锁控制,使得系统在死锁或误跟踪时自动回到频率搜索状态;采用直接数字合成器(DDS)作为频率调整和信号产生的器件,实现了全数字系统,调整方便,精度高;采用复杂可编程逻辑器件(CPLD)做相位比较和DDS控制,使频率跟踪速度快,并且跟踪精度和速度均可控制。 |
| 英文摘要: |
| This paper analyzes the impedance characteristics of the sandwich piezoelectric transducer,discuses the inadequacy of present frequency tracing schemes using phase locking method.It then proposes a novel scheme,and presents the circuitry that realizes the scheme. The distinguishing features of this scheme are as follows:utilizes a strategy of sweeping frequency before tracing and thus keeps away from the difficulty of settling the frequency tracing band;adds an unlock function which renders the system back to frequency sweeping state in the case of dead-locking or false tracing;uses a direct digital synthesizer(DDS) to adjust the frequency and generate driving signal,thus forms an all-digital system which is convenient to manipulate and can achieve high degree of accuracy;uses complex programmable logic device(CPLD) to detect phase difference and to control DDS,thus achieves high tracing speed and makes the tracing speed and the tracing accuracy controllable. |
| DOI：10.11684/j.issn.1000-310X.2009.04.013 |
| 中文关键词: 夹心式压电换能器 频率跟踪 直接数字合成器(DDS) |
| 英文关键词: Sandwich piezoelectric transducer Frequency tracing Direct digital synthesizer(DDS) |
| 基金项目:国家自然科学基金(基金批准号60673152)资助 |
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