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Abstract #3623

Gradient Amplifier Design with Advanced Power Semiconductor Devices and Simple Topology

Ruxi Wang1, Juan Sabate1, Eladio Delgado1, Xiaohu Liu1, and Fengfeng Tao1

1GE global research center, Niskayuna, NY, United States

Gradient Amplifier is one of the key components in a MRI system to supply the gradient coil with large current (>1000A) and high voltage (>2000V) to achieve strong gradient field and fast slew rate. In this paper, a high efficiency two H-bridge in cascaded gradient driver design with 1700V SiC MOSFET is designed and fabricated. The power module switching frequency is 31.25 kHz and amplifier total output ripple frequency is 125 kHz. The amplifier loss and efficiency (around 99.5%) is verified in experimental results.

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