Parallel Operation of Gradient Power Amplifiers without Large Current-Sharing Reactor

This paper presents a novel solution for the parallel operation of gradient power amplifiers to drive the gradient coil within magnetic resonance imaging system. A total-current feedback algorithm collaborating with a current-sharing algorithm, also with a small magnetic core ensure tight load sharing without large coupling reactor. The control bandwidth has not to be compromised, resulting in fast, smooth and high fidelity performance. Experimental results verify the effectiveness.