The design of power supply for HF MRI superconducting magnet

摘要

High-field (HF) magnet resonance imaging (MRI) is designed as a large aperture human body imaging system. The superconducting magnet provides magnetic field B_0 for HF MRI. The power supply is a key component, provides excitation and demagnetization functions for superconducting magnet. According to the requirements, the superconducting magnet power supply needs to be designed and developed with small volume and high reliability and bidirectional energy flow. A combination topology is proposed, including a pulse-width-modulation (PWM) rectifier, a dual-active-bridge (DAB), and a H-bridge. In this paper, the principle of the combination topology is introduced briefly. Meanwhile, the analysis and test results of a PWM rectifier based on hybrid active-neutral-point-clamped (ANPC) three-level are given.