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An improved phase-locked loop method for automatic resonance frequency tracing based on static capacitance broadband compensation for a high-power ultrasonic transducer

机译:一种基于静态电容宽带补偿的大功率超声换能器自动谐振频率跟踪的改进锁相环方法

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摘要

The phase-locked loop (PLL) method is widely used for automatic resonance frequency tracing (ARFT) of high-power ultrasonic transducers, which are usually vibrating systems with high mechanical quality factor (Qm). However, a heavily-loaded transducer usually has a low Qm because the load has a large mechanical loss. In this paper, a series of theoretical analyses is carried out to detail why the traditional PLL method could cause serious frequency tracing problems, including loss of lock, antiresonance frequency tracing, and large tracing errors. The authors propose an improved ARFT method based on static capacitance broadband compensation (SCBC), which is able to address these problems. Experiments using a generator based on the novel method were carried out using crude oil as the transducer load. The results obtained have demonstrated the effectiveness of the novel method, compared with the conventional PLL method, in terms of improved tracing accuracy (±9 Hz) and immunity to antiresonance frequency tracing and loss of lock.
机译:锁相环(PLL)方法被广泛用于大功率超声换能器的自动谐振频率跟踪(ARFT),大功率超声换能器通常是具有高机械品质因数(Q m )的振动系统。但是,由于负载具有较大的机械损耗,因此负载较大的传感器通常具有较低的Q m 。在本文中,进行了一系列的理论分析,以详细说明传统PLL方法为何会导致严重的频率跟踪问题,包括锁定丢失,反谐振频率跟踪以及大的跟踪误差。作者提出了一种基于静态电容宽带补偿(SCBC)的改进的ARFT方法,该方法能够解决这些问题。使用原油作为传感器负载进行了基于新方法的发电机实验。与传统的PLL方法相比,所获得的结果证明了该新方法的有效性,该方法具有改进的跟踪精度(±9 Hz)以及对反谐振频率跟踪的免疫力和锁定丢失。

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