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Abstract #4239

Adaptive Deadtime Compensation Control for MRI Gradient Amplifier

Huan Hu1, Juan A Sabate1, and Ruxi Wang2
1GE Global Research, Niskayuna, NY, United States, 2GE Aviation, Dayton, OH, United States

MRI gradient amplifier needs to provide current with extremely high fidelity to the commanded values of any arbitrary shape. Therefore, the control requires very accurate compensations of nonlinearities. One of the major sources is the deadtime among the power semiconductor devices. The existing deadtime compensation was to pre-test the specific system with different current commands and summarize a look-up table for use, which required lots of time and effort and cannot be used for different systems. This abstract demonstrates an adaptive deadtime compensation method which works well under different current commands and different systems without additional hardware cost.

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