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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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2m?)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。
According to the requirements of load stability of a power supply(low voltage of 3 V, current of1500 A, and current ripple less than 1 ppm) for the 14 T MRI(magnetic resonance imaging) magnet(inductance307 H and a connection impedance of 2 m?), 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.
According to the requirements of load stability of a power supply(low voltage of 3 V, current of1500 A, and current ripple less than 1 ppm) for the 14 T MRI(magnetic resonance imaging) magnet(inductance307 H and a connection impedance of 2 m?), 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.
引文
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[5]吴景林.40T混合磁体外超导磁体的开关电源方案研究与设计[D].合肥:中国科学技术大学,2014.47-50.
[2]张国安,翟长生,等.冲量控制技术消除开关电源低频纹波的研究[J].电力电子技术,2009,43(4):75-78.
[3]张兴.电力电子技术[M].北京:科学出版社,2012.62-68.
[4]Sinanna A,Bermond S,Donati A,et al.Field stabilization of an MRI magnet operating in driven mode[J].IEEE Transactions on Applied Superconductivity,2009,19(3):2301-2304.
[5]吴景林.40T混合磁体外超导磁体的开关电源方案研究与设计[D].合肥:中国科学技术大学,2014.47-50.