Nonlinear control for the front end power supplies of magnetic imaging resonance gradient amplifiers
SHI Hongliang, XU Jing, CUI Bin, JIANG Xiaohua
State Key Laboratory of Power Electronics and Electric Machine Control, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
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.
施洪亮, 许劲, 崔彬, 蒋晓华. 磁共振成像系统中梯度放大器前级电源的非线性控制[J]. 清华大学学报（自然科学版）, 2016, 56(3): 306-311,317.
SHI Hongliang, XU Jing, CUI Bin, JIANG Xiaohua. Nonlinear control for the front end power supplies of magnetic imaging resonance gradient amplifiers. Journal of Tsinghua University(Science and Technology), 2016, 56(3): 306-311,317.
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2016, Vol. 56 
