Zao Yongming, Ouyang Qi, Chen Jiawei, Zhang Xinglan, Hou Shuaicheng
Institute of Smart Engineering, College of Automation, Chongqing University, Chongqing 400030, People's Republic of China.
Institute of Computer Science and Engineering, Chongqing University of Technology, Chongqing 400030, People's Republic of China.
Rev Sci Instrum. 2017 Aug;88(8):084707. doi: 10.1063/1.4999446.
This paper investigates the design and implementation of an improved series-parallel inductor-capacitor-inductor (LCL) resonant circuit power supply for excitation of electromagnetic acoustic transducers (EMATs). The main advantage of the proposed resonant circuit is the absence of a high-permeability dynamic transformer. A high-frequency pulsating voltage gain can be achieved through a double resonance phenomenon. Both resonant tailing behavior and higher harmonics are suppressed by the improved resonant circuit, which also contributes to the generation of ultrasonic waves. Additionally, the proposed circuit can realize impedance matching and can also optimize the transduction efficiency. The complete design and implementation procedure for the power supply is described and has been validated by implementation of the proposed power supply to drive a portable EMAT. The circuit simulation results show close agreement with the experimental results and thus confirm the validity of the proposed topology. The proposed circuit is suitable for use as a portable EMAT excitation power supply that is fed by a low-voltage source.
本文研究了一种改进的串并联电感-电容-电感（LCL）谐振电路电源的设计与实现，用于激励电磁超声换能器（EMAT）。所提出的谐振电路的主要优点是没有高磁导率的动态变压器。通过双谐振现象可以实现高频脉动电压增益。改进后的谐振电路抑制了谐振拖尾行为和高次谐波，这也有助于超声波的产生。此外，所提出的电路可以实现阻抗匹配，还可以优化转换效率。描述了电源的完整设计和实现过程，并通过实现所提出的电源来驱动便携式EMAT进行了验证。电路仿真结果与实验结果吻合良好，从而证实了所提出拓扑的有效性。所提出的电路适用于由低压源供电的便携式EMAT激励电源。
