Patent ID: 9541618
Date: 2017-01-10
CPC Classifications: G01R

Claim:
1. A method for operating an MRI gradient magnet system for generating gradient magnetic fields, by driving gradient coil currents through gradient coils of the gradient magnet system, wherein the gradient coil currents are controlled by a controller which is realized in the form of a state space feedback controller in the digital domain and which generates a digital output value by means of which a pulse-width modulated voltage is generated for driving the gradient coil currents through the gradient coils with a predetermined waveform wherein a control deviation is integrated which is generated in the form of a difference between the gradient coil current and a reference current, the digital output value (u) is generated from the integrated control deviation, for delay compensation, and the digital output value (u) is fed back and delayed by one clock cycle, two clock cycles, and three clock cycles and then subtracted from the digital output value (u).