Abstract #3632

A low cost home-built gradient amplifier for matrix gradient coils

Huijun Yu¹, Frank Huethe², Sebastian Littin¹, Kelvin J. Layton¹, Feng Jia¹, Stefan Kroboth¹, and Maxim Zaitsev¹

¹Dept. of Radiology, Medical Physics, University Medical Center Freiburg, Freiburg, Germany, ²Dept. of Clinical Neurology and Neurophysiology, University of Freiburg, Freiburg, Germany

To address the increased cost of high numbers of amplifiers for matrix gradient coils, a low cost home-built 100A/100V gradient amplifier is proposed. The water cooling amplifier consists of several parts: a controller that interfaces to a waveform generator and provides the current control signal; an H-bridge circuit that generates constant current to the load; and a ripple cancellation filter that reduces the inevitable ripple current. The switching frequency and peak ripple current of amplifier is 100 kHz and 300 mA, respectively. The amplifier can be operated with maximum continuous current (100A) for at least 1 min.

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