电磁超声激励系统阻抗匹配网络的设计

发布时间：2018-04-10 14:56

  本文选题：电磁超声 + 电磁力　； 参考：《电工技术学报》2016年16期

【摘要】：电磁超声换能器的换能效率低是限制电磁超声技术广泛应用的一个重要因素,如何提高换能器的换能效率一直都是电磁超声领域的研究重点。激励线圈作为激励系统中十分重要的一部分,其激励电流的大小决定试件表面产生电磁力的大小。但是,由于线圈和功率放大器之间存在严重的阻抗失调,使其流过的电流及获得的功率不是很理想。为此,根据电抗元件网络可精确实现调谐和变阻的特性,结合二进制的组合方式,设计了能够匹配多种频率线圈的电抗网络。该网络的接入可实现功率源和负载之间的最大功率传递,提高加载在线圈上的电流,为电磁超声激励提供较大的能量。仿真和实验结果表明:该匹配网络能在0.5~5MHz宽频率范围内有效地提高电源的输出效率,提升电磁加载的信噪比及转换效率,为电磁超声的后续研究奠定基础。
[Abstract]:The low efficiency of electromagnetic ultrasonic transducer is an important factor limiting the wide application of electromagnetic ultrasonic technology. How to improve the efficiency of electromagnetic ultrasonic transducer has always been the focus of research in the field of electromagnetic ultrasound.The exciting coil is an important part of the excitation system. The magnitude of the exciting current determines the electromagnetic force produced on the surface of the specimen.However, due to the serious impedance misalignment between the coil and the power amplifier, the current flowing and the power obtained are not ideal.Therefore, according to the characteristic that reactance element network can accurately realize tuning and variable-resistance, combined with binary combination mode, the reactance network which can match various frequency coils is designed.The access of the network can realize the maximum power transfer between the power source and the load, increase the current on the loading loop, and provide a large amount of energy for the electromagnetic ultrasonic excitation.The simulation and experimental results show that the matching network can effectively improve the output efficiency of power supply in the wide frequency range of 0.5~5MHz, enhance the signal-to-noise ratio and conversion efficiency of electromagnetic loading, and lay a foundation for the further study of electromagnetic ultrasound.
【作者单位】： 河北工业大学电磁场与电器可靠性省部共建重点实验室;天津工业大学电工电能新技术天津市重点实验室;
【基金】：国家自然科学基金(51307043) 河北省自然科学基金(E2016202260) 天津市自然科学基金(16JCYBJC19000)资助项目
【分类号】：TB551
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本文编号：1731681