基于多频同步选择性消谐脉宽调制的D类多频涡流检测功率放大器
A Class D Power Amplifier for Multi-Frequency Eddy Current Testing Based on Multi-Simultaneous-Frequency Selective Harmonic Elimination Pulse Width Modulation
摘要：
效率和多频输出能力是衡量多频涡流检测中功率放大器性能的两个主要指标。开关模式功率放大器被认为具有非常高的效率，但它们很少被采用在仪器的发展MECT。此外，开关模式功率放大器本身缺乏MSF能力的研究文献。本文针对这两个问题设计了一种D类功率放大器。提出了一种MSF选择性谐波消除脉宽调制方法，用于产生富含选择性谐波的交变磁场。一个基于现场可编程门阵列的实验系统已经开发，以验证设计。结果表明，所提出的方法是能够产生高的MSF电流的发射线圈与低失真的信号。
英文摘要：
Efficiency and multisimultaneous-frequency (MSF) output capability are two major criteria characterizing the performance of a power amplifier in the application of multifrequency eddy current testing (MECT). Switch-mode power amplifiers are known to have a very high efficiency, yet they have rarely been adopted in the instrumental development of MECT. In addition, switch-mode power amplifiers themselves are lacking in the research literature for MSF capability. In this article, a Class D power amplifier is designed so as to address the two issues. An MSF selective harmonic elimination pulsewidth modulation method is proposed to generate alternating magnetic fields, which are rich in selected harmonics. A field-programmable-gate-array-based experimental system has been developed to verify the design. Results show that the proposed methodology is capable of generating high MSF currents in the transmitting coil with a low distortion of signal.
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