Providing accurate gradient currents is challenging due to the nonlinearity of the gradient system arising from gradient power amplifiers and power supply stages which causes droop in the output currents. This work introduces a nonlinear model for the gradient array system by using the state-space averaging technique and the nonlinear inversion of the model compensates for droop. The feasibility of the method is depicted by simulation and experimental results. The proposed method can provide desired currents by lower voltages which results in minimizing the needed power. It is also possible to use small capacitors to lower the cost of system.
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