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