Design and implementation of improved LsCpLp resonant circuit for power supply for high-power electromagnetic acoustic transducer excitation

Yongming Zao; Qi Ouyang; Jiawei Chen; Xinglan Zhang; Shuaicheng Hou

doi:10.1063/1.4999446

Design and implementation of improved L_sC_pL_p resonant circuit for power supply for high-power electromagnetic acoustic transducer excitation

Rev Sci Instrum. 2017 Aug;88(8):084707. doi: 10.1063/1.4999446.

Authors

Yongming Zao¹, Qi Ouyang¹, Jiawei Chen¹, Xinglan Zhang², Shuaicheng Hou¹

Affiliations

¹ Institute of Smart Engineering, College of Automation, Chongqing University, Chongqing 400030, People's Republic of China.
² Institute of Computer Science and Engineering, Chongqing University of Technology, Chongqing 400030, People's Republic of China.

PMID: 28863655
DOI: 10.1063/1.4999446

Abstract

This paper investigates the design and implementation of an improved series-parallel inductor-capacitor-inductor (L_sC_pL_p) 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.