梯度放大器高性能控制系统的开发

Development of a High Performance Control System of the Gradient Amplifier

梯度放大器是核磁共振成像系统的重要组成部分,它负责放大前级控制系统发出的参考信号,驱动后级的梯度线圈,其典型输出波形为梯形波。介绍了一种双H桥串联的主电路拓扑结构及其控制算法,并为梯度放大器设计了一套高性能的控制系统。实验结果表明,所设计的主电路和控制系统适用于梯度放大器的实验研究。

The gradient amplifier is an essential equipment of the Magnetic Resonance Imaging （MRI） System which amplifies the reference signal from the control system and drives the gradient coils.The typical output waveform of the gradient amplifier is in the trapezoid shape.This paper introduces a topology with two H-bridges stacked,proposes a feed forward control scheme and designs a high performance control system according to the needs of the gradient amplifier. Experiments have been carried out and the results show that the main circuit and control system are suitable for the experimental research of the gradient amplifier.