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Drop-field circuit and method for superconducting magnets

一种超导磁体、降场的技术，应用在超导磁体/线圈、电路、磁性物体等方向，能够解决磁体线圈电感大、超导磁体降场等问题

Active Publication Date: 2017-08-22
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention solves the problem that the superconducting magnet cannot be dropped by using the load resistance inside the high-power power supply due to the large inductance of the magnet coil

Method used

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  • Drop-field circuit and method for superconducting magnets
  • Drop-field circuit and method for superconducting magnets
  • Drop-field circuit and method for superconducting magnets

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Embodiment Construction

[0032] In order to make the above objects, features and advantages of the present invention more obvious and comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0034] As described in the background art, it is a technical problem to artificially de-field a superconducting magnet without causing the magnet coil to quench. In the prior art, the current in the magnet coil is consumed by the load resistance inside the excitation power supply to perform de-field. However, since the load resistance inside the excitation power supply is very small and the inductance of the mag...

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Abstract

The invention discloses a field reducing circuit and method of a superconducting magnet. The field reducing circuit comprises a magnet coil including multiple series-connected superconducting coils; a low temperature switch connected with the two ends of the magnet coil in parallel; an energy unloading device connected with the two ends of the magnet coil in parallel, wherein a threshold voltage conducted by the energy unloading device is lower than the induction voltage generated by the magnet coil; and a monitoring unit for monitoring whether field reduction is already finished for the superconducting magnet. The field reducing circuit and method of the superconducting magnet, provided by the technical scheme, can rapidly and effectively finish field reduction of the superconducting magnet under the condition that no magnet coil quench is caused.

Description

technical field [0001] The invention relates to the field of magnetic resonance technology, in particular to a field drop circuit and method of a superconducting magnet. Background technique [0002] The magnet is the core component in the magnetic resonance imaging (MRI, Magnetic Resonance Imaging) system, which provides the required magnetic field environment for imaging. At present, the magnets in the MRI system can be divided into permanent magnets, permanent magnets, superconducting magnets and other types. Superconducting magnets can generate a magnetic field with good uniformity and high stability. [0003] figure 1 Shown is a schematic diagram of the main circuit of an existing superconducting magnet, including: a magnet coil 10, a cryogenic switch 12, an excitation power supply 13, a wire 14 and a quench protection circuit (not shown). The magnet coil 10 consists of 9 individual superconducting coils connected in series. The low-temperature switch 12 is a section...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/3815H01F6/00
CPCG01R33/3815H01F6/006
Inventor 王相得
Owner SHANGHAI UNITED IMAGING HEALTHCARE