平顶脉冲磁场连续微调控系统设计

万昊; 张绍哲; 刘沁莹; 魏文琦; 王正磊; 韩小涛

doi:10.11884/HPLPB202234.210468

平顶脉冲磁场连续微调控系统设计

doi: 10.11884/HPLPB202234.210468

万昊^{1, 2,},
张绍哲^{1, 2},
刘沁莹^{1, 2},
魏文琦^{1, 2},
王正磊^{1, 2},
韩小涛^{1, 2, ,}

1.
华中科技大学国家脉冲强磁场科学中心, 武汉 430074
2.
华中科技大学强电磁工程与新技术国家重点实验室, 武汉 430074

基金项目: 国家自然科学基金项目 (52107152, U21A20458, 51821005); 国家重点研发计划项目 (2021YFA1600301)

详细信息

作者简介:
万　昊，m201971591@hust.edu.cn

通讯作者:
韩小涛，xthan@mail.hust.edu.cn

中图分类号: TM15
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- 文章访问数: 753
- HTML全文浏览量: 398
- PDF下载量: 42
- 被引次数: 0
出版历程
- 收稿日期: 2021-11-06
- 修回日期: 2021-12-31
- 录用日期: 2022-01-17
- 网络出版日期: 2022-07-04
- 刊出日期: 2022-05-12

Design of continuous micro-control system for flat-top pulsed magnetic field

Wan Hao^{1, 2
,},
Zhang Shaozhe^{1, 2},
Liu Qinying^{1, 2},
Wei Wenqi^{1, 2},
Wang Zhenglei^{1, 2},
Han Xiaotao^{1, 2
, ,}

1.
Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
2.
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China

摘要

摘要: 针对现有电容器放电开环控制产生的平顶脉冲磁场稳定度难以满足核磁共振要求这一问题，提出一种平顶磁场闭环连续微调控方案。在脉冲磁体中放置一个补偿线圈，其由蓄电池供电，采用前馈控制加反馈控制的策略，利用IGBT有源区对补偿线圈的磁场进行线性调控，补偿背景磁场的波动，形成高稳定度平顶磁场。为此，设计了IGBT工作于有源区的驱动电路，搭建了原型机进行实验，结果表明，该方法能够将磁场稳定度提升至50×10⁻⁶，验证了方案的可行性。
- 平顶脉冲磁场 /
- 核磁共振 /
- IGBT有源区 /
- 前馈控制 /
- PI控制
Abstract: Aiming at the problem that the stability of the flat-top pulsed magnetic field generated by open-loop control of capacitor discharge is difficult to meet the requirements of nuclear magnetic resonance, this paper proposes a closed-loop continuous micro-control scheme for the flat-top magnetic field. A compensation coil is placed in the pulse magnet, which is powered by batteries, adopts the strategy of feedforward control and feedback control, uses the IGBT active region to linearly regulate the magnetic field of the compensation coil, compensates for the fluctuation of the background magnetic field, and forms a highly stable flat-top magnetic field. To this end, this paper designs a driving circuit for IGBTs working in the active region, and builds a prototype for experiments. The results show that the method proposed can increase the magnetic field stability to 50×10⁻⁶, which verifies the feasibility of the scheme.
- flat-top pulsed magnetic field /
- nuclear magnetic resonance /
- IGBT active region /
- feedforward control /
- PI control

HTML全文

图 1 平顶脉冲磁场生成原理图

Figure 1. Schematic diagram of flat-top pulsed magnetic field generation

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图 2 背景磁场和补偿磁场波形

Figure 2. Background magnetic field and compensation magnetic field waveform

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图 3 IGBT输出特性

Figure 3. Output characteristic of IGBT

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图 4 有源区内IGBT驱动方案

Figure 4. IGBT drive scheme in active region

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图 5 系统控制原理图

Figure 5. System control schematic diagram

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图 6 控制系统状态图

Figure 6. Statechart diagram of control program

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图 7 实验装置实物图

Figure 7. Physical image of experimental device

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图 8 3 T平顶脉冲磁场原型机实验结果

Figure 8. 3 T flat-top pulsed magnetic field prototype experiment result

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图 9 62 T平顶磁场等效实验结果

Figure 9. Result of 62 T flat-top magnetic field equivalent experiment

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表 1 电路参数

Table 1. Circuit parameters

capacitor/ mF	magnet inductance/mH	magnet resistance/mΩ	crowbar resistance/mΩ	battery voltage/V	compensate coil inductance/μH	compensate coil resistance (298 K)/Ω	magnet coil constant/(kA·T⁻¹)	compensate coil constant/(A·T⁻¹)
4.8	33.126	819.3	500	96	215.15	2.76	2	196

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参考文献(11)

[1]	Liu Qinying, Liu Shiyu, Luo Yongkang, et al. Pulsed-field nuclear magnetic resonance: status and prospects[J]. Matter and Radiation at Extremes, 2021, 6: 024201. doi: 10.1063/5.0040208
[2]	Wu Tao, Mayaffre H, Krämer S, et al. Magnetic-field-induced charge-stripe order in the high-temperature superconductor YBa₂Cu₃O_y[J]. Nature, 2011, 477(7363): 191-194. doi: 10.1038/nature10345
[3]	Goto T, Mori M, Chiba K, Suzuki T, et al. High-field Cu/La-NMR study on high-T_c cuprate La_2-xBa_xCuO₄(x = 0.125)[J]. Physica B:Condensed Matter, 2000, 284/288: 657-658. doi: 10.1016/S0921-4526(99)02322-4
[4]	Rourke P M C, Mouzopoulou I, Xu Xiaofeng, et al. Phase-fluctuating superconductivity in overdoped La_2−xSr_xCuO₄[J]. Nature Physics, 2011, 7(6): 455-458. doi: 10.1038/nphys1945
[5]	Sebastian S E, Harrison N, Palm E, et al. A multi-component Fermi surface in the vortex state of an underdoped high-T_c superconductor[J]. Nature, 2008, 454(7201): 200-203. doi: 10.1038/nature07095
[6]	Jiang Fan, Peng Tao, Xiao Houxiu, et al. Design and test of a ﬂat-top magnetic ﬁeld system driven by capacitor banks[J]. Review of Scientific Instruments, 2014, 85: 045106. doi: 10.1063/1.4870410
[7]	Wang Shuang, Peng Tao, Jiang Fan, et al. Upgrade of the pulsed magnetic field system with flat-top at the WHMFC[J]. IEEE Transactions on Applied Superconductivity, 2020, 30: 4900404.
[8]	Zhang Shaozhe, Wang Zhenglei, Qi Xin, et al. An innovative method for generating high-stability flat-top pulsed magnetic field[C]//Proceedings of 2018 IEEE International Power Modulator and High Voltage Conference (IPMHVC). 2018: 411-415.
[9]	Kohama Y, Kindo K. Generation of flat-top pulsed magnetic fields with feedback control approach[J]. Review of Scientific Instruments, 2015, 86: 104701. doi: 10.1063/1.4931689
[10]	Linder S. Power semiconductors[M]. Lausanne, Switzerland: EPFL Press, 2006.
[11]	Zhang Shaozhe, Wang Zhenglei, Ding Tonghai, et al. Realization of high-stability flat-top pulsed magnetic fields by a bypass circuit of IGBTs in the active region[J]. IEEE Transactions on Power Electronics, 2020, 35(3): 2436-2444. doi: 10.1109/TPEL.2019.2931488