Topology design and ripple suppression of 14T MRI superconducting magnet power supply

doi:10.16568/j.0254-6086.201902008

NUCLEAR FUSION AND PLASMA PHYSICS ›› 2019, Vol. 39 ›› Issue (2): 144-150.DOI: 10.16568/j.0254-6086.201902008

• Nuclear Fusion Engineering and Technology • Previous Articles Next Articles

Topology design and ripple suppression of 14T MRI superconducting magnet power supply

PENG Cheng-wei1, 2, GAO Ge1, SHENG Zhi-cai1, ZHOU Yu1, 2

(1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031; 2. University of Science and Technology of China, Hefei 230026)

Online:2019-06-15 Published:2019-06-13

14T 核磁共振成像超导磁体电源拓扑设计及纹波抑制

彭程伟1, 2，高格*1，盛志才1，周宇1, 2

(1. 中国科学院等离子体物理研究所，合肥 230031； 2. 中国科学技术大学，合肥 230026)

作者简介:彭程伟(1993-)，男，安徽合肥人，硕士研究生，从事超导磁体电源技术研究。
基金资助:
中国科学院战略性先导科技专项(B 类)(XDB25000000)

Abstract

Abstract:

According to the requirements of load stability of a power supply (low voltage of 3V, current of 1500A, and current ripple less than 1ppm) for the 14T MRI (magnetic resonance imaging) magnet (inductance 307H and a connection impedance of 2mΩ), based on the problems of common topology, a topology suitable for the operation of this large inductance superconducting magnet is proposed. The topology is a combination of multi-stage processing, passive filtering and active filtering. The power topology is presented in sequence from the input stage, the intermediate conversion stage and the output stage, and the role of the topology design of each part in the suppression of the load current ripple is highlighted. Finally, Matlab simulation analysis is carried out to verify the rationality of the topology design.

Key words: Magnet power supply, Ripple suppression, Topology, Magnetic resonance imaging

摘要：

根据14T 核磁共振成像(MRI)大电感超导体磁体(电感307H、连接阻抗2mΩ)负载纹波的需求(低压为3V、电流为1500A、电流纹波小于1ppm)，基于常见拓扑结构出现的问题，提出了一种适用于这种大电感超导磁体运行电源的拓扑结构。此拓扑结构采用多级处理、无源滤波和有源滤波相结合的思想来设计。介绍了电源的输入级、中间变换级及输出级三个部分的拓扑，并阐述了各部分拓扑设计对负载电流纹波抑制的作用。通过 Matlab 仿真分析，验证了拓扑设计的合理性。

关键词: 磁体电源, 纹波抑制, 拓扑结构, 核磁共振成像

CLC Number:

TN56

PENG Cheng-wei1, 2, GAO Ge1, SHENG Zhi-cai1, ZHOU Yu1, 2. Topology design and ripple suppression of 14T MRI superconducting magnet power supply[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2019, 39(2): 144-150.

彭程伟1, 2，高格*1，盛志才1，周宇1, 2. 14T 核磁共振成像超导磁体电源拓扑设计及纹波抑制[J]. 核聚变与等离子体物理, 2019, 39(2): 144-150.

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Topology design and ripple suppression of 14T MRI superconducting magnet power supply

14T 核磁共振成像超导磁体电源拓扑设计及纹波抑制

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