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- 2016
磁共振成像系统中梯度放大器前级电源的非线性控制
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Abstract:
为了实现磁共振成像系统中梯度放大器前级电源对负载电流阶跃的高速响应, 提出了一种单电压环非线性PID控制器, 该控制器的控制参数是基于误差变化的指数函数。为了进一步提高性能, 在此非线性PID控制器的基础上, 增加了一个电流内环比例控制器。在一台120 V/30 A的前级电源样机上进行了实验验证, 将这2种控制策略对负载电流阶跃时输出电压动态响应结果与系统的动态物理极限进行了对比。实验结果表明: 所设计的电压电流双闭环非线性控制器比单电压环非线性PID控制器有更好的动态响应性能, 更接近系统的动态物理极限。
Abstract：A nonlinear digital PID single loop control method was developed to improve the dynamic load response of the front end power supply of magnetic imaging resonance (MRI) gradient amplifiers with the controller parameters are based on the exponential functions of the error. The dynamic load response is improved by an inner-loop current controller added to the nonlinear digital PID controller. The two control methods are verified in a 120 V/30 A prototype of the power supply for a step load current change and compared with the dynamic physical limits of the system. The results indicate that the controller has better dynamic performance which is closer to the dynamic physical limits of the system that the original nonlinear PID controller.
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