New Adaptive Broadband Full-Bridge Converter Impedance Matching Network for Giant Magnetostrictive Transducer

Abstract

This article proposes an adaptive broadband full-bridge converter impedance matching network (FCIMN) between a power amplifier and the giant magnetostrictive transducer (GMT). Compared with the conventional passive impedance matching methods, the proposed one can realize the load impedance matching of power amplifiers under a wide frequency range. In this article, first, the elementary principle of operation of FCIMN is introduced mathematically. After that, a control method is proposed to achieve adaptive broadband impedance matching, including dynamic active power calculation, reactive power calculation, segmented proportional–resonant controller and combined feedback and feedforward voltage control. On this basis, the parameter design method is proposed for the operating frequency range. Finally, the simulation and laboratory-scale experimental results are provided to validate the effectiveness of the proposed FCIMN, discussions, and control method. It clearly shows that the proposed FCIMN can adaptively match load impedance for the different GMTs, broadband range, and the power amplifier power utilization factor is significantly improved.