Nonlinear control for the front end power supplies of magnetic imaging resonance gradient amplifiers

SHI Hongliang; XU Jing; CUI Bin; JIANG Xiaohua

doi:10.16511/j.cnki.qhdxxb.2016.21.029

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Journal of Tsinghua University(Science and Technology) ›› 2016, Vol. 56 ›› Issue (3) : 306-311,317. DOI: 10.16511/j.cnki.qhdxxb.2016.21.029

ELECTRICAL ENGINEERING

Nonlinear control for the front end power supplies of magnetic imaging resonance gradient amplifiers

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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.

Key words

power supply / dynamic response / dynamic physical limits / nonlinear PID control / current-mode control

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SHI Hongliang, XU Jing, CUI Bin, JIANG Xiaohua. Nonlinear control for the front end power supplies of magnetic imaging resonance gradient amplifiers[J]. Journal of Tsinghua University(Science and Technology). 2016, 56(3): 306-311,317 https://doi.org/10.16511/j.cnki.qhdxxb.2016.21.029

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