Design and performance analysis of ultrasonic generator for giant magnetostrictive transducer
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摘要: 面向超磁致伸缩换能器的超声电源相对于传统的压电换能器超声电源存在一定的区别，但是目前这方面的相关研究报道较少。本研究建立了带有无线能量传输装置的等效电路模型，设计了一种面向超磁致伸缩换能器的超声电源。频率源基于直接数字合成（DDS）技术并利用全桥开关放大电路进行功率放大，使用相位和有效值（RMS）计算实现频率追踪策略，从而使该电源具备定频信号输出以及实时频率追踪的功能。最后，对超磁致伸缩换能器超声电源的输出性能进行了测试与分析，结果表明，在开环定频驱动功能下可以输出15~50 KHz的超声信号，在闭环追频驱动功能下可以在工作频率点处长时间稳定驱动超磁致伸缩换能器。此外，文章对面向超磁致伸缩换能器的超声电源进行了升级，并进行实验验证该电源可以实现超过1 kW的大功率输出。Abstract: The ultrasonic generator for giant magnetostrictive transducer (GMT) is different from the traditional ones for piezoelectric transducers. However, there are few relevant reports of generators for GMT. In this investigation, the equivalent circuit model of GMT with contactless energy transfer was established, and an ultrasonic generator for GMT was designed. The frequency source circuit was based on direct digital synthesis (DDS), and a full-bridge switching circuit was used for power amplification. The frequency tracking strategy was implemented based on the phase sampling and RMS calculation modules, so that the ultrasonic generator could output signals with fixed frequencies and realize frequency tracking. Finally, the performance of the generator was tested and analyzed. The results showed that, the generator could output ultrasonic signals within a range of 15-50 kHz under the open-loop fixed function and could stably drive GMT to work at the working frequency for a long duration under the closed-loop frequency tracking function. Besides, this investigation also upgraded ultrasonic generator for GMT, and it was verified that upgraded generator could output more than 1 kW power by experiments.
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表 1 开环定频驱动实验的频率测试结果
组别 预设频率/
kHz平均输出
频率/kHz相对
误差标准差/
kHz最大值/
kHz最小值/
kHz#1组 15.0 15.04 0.27% 0.19 15.27 14.74 #2组 20.5 20.48 0.10% 0.19 20.75 20.27 #3组 30.0 30.17 0.57% 0.27 30.49 29.84 #4组 40.0 40.25 0.63% 0.50 40.98 39.50 #5组 50.0 49.83 0.36% 0.41 50.45 49.34 
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表 2 开环定频驱动实验的电流有效值测试结果
组别 平均输出电流/mA 标准差/mA 最大值/mA 最小值/mA #1组 383.79 1.18 385.66 382.47 #2组 286.05 1.90 288.07 283.15 #3组 175.62 0.29 176.07 175.35 #4组 121.06 0.11 121.20 120.91 #5组 88.44 0.35 88.95 88.00
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表 3 升级后的超声电源驱动性能实验结果
组别 输出电流有效值/A 输出电压有效值/V 输出功率有效值/W #1组 1.18 183.51 216.65 #2组 1.64 255.78 419.90 #3组 1.93 303.23 585.69 #4组 2.39 378.48 905.98 #5组 2.66 421.92 1 122.40
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