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Quench-of-superconductivity protection circuit and quench-of-superconductivity protection method for superconducting magnet system

A quench protection, superconducting magnet technology, applied in the usage of superconductor elements, emergency protection circuit devices, electrical components, etc., can solve the problems of high cost and quench start lag, achieve constant resistance, enhance stability, easy-to-achieve effects

Active Publication Date: 2017-04-05
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a superconducting magnet system to solve the problems of quench start-up lag and high cost in the prior art solutions

Method used

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  • Quench-of-superconductivity protection circuit and quench-of-superconductivity protection method for superconducting magnet system
  • Quench-of-superconductivity protection circuit and quench-of-superconductivity protection method for superconducting magnet system
  • Quench-of-superconductivity protection circuit and quench-of-superconductivity protection method for superconducting magnet system

Examples

Experimental program
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Embodiment 1

[0037] Such as image 3 It is a schematic structural diagram of a quench protection circuit for a superconducting magnet system according to Embodiment 1 of the present application. The superconducting magnet system includes a superconducting magnet circuit and a quench protection circuit, wherein the superconducting magnet circuit includes multiple superconducting coil units such as L1-L8, and the superconducting magnet circuit composed of multiple superconducting coil units is respectively connected to positive current leads 22 And the negative current lead 23, to realize the excitation of the superconducting magnet by the excitation power supply (not shown in the figure). In order to maintain current flow in the superconducting magnet after disconnecting the external excitation power supply, a magnet back-to-back diode stack 20 and a cryogenic switch are also provided between the positive current lead 22 and the negative current lead 23 (both ends of the superconducting coi...

Embodiment 2

[0057] On the basis of the first embodiment, the quench protection circuit of this embodiment further includes a third-order branch S3. Such as Figure 4 Shown is a schematic diagram of the quench protection structure of the superconducting magnet system in the second embodiment of the present application. The third-order branch S3 is arranged in parallel with the first-order branch S1 or the second-order branch S2. The heater can be connected with the third branch The connection constitutes a third quench protection circuit, and the third-order branch S3 includes a third fuse F3 and a second resistor R2. The resistance r of the second resistor R2 2 greater than the resistance r of the first resistor R1 1 , the resistance r of the third fuse f3 and the resistance r of the first fuse f1 or the resistance of the second fuse r f2 near.

[0058] In this embodiment, when a quench occurs in a superconducting magnet, the working process of the above quench protection circuit is...

Embodiment 3

[0072] Such as Figure 5 It is a schematic diagram of the quench protection structure of the superconducting magnet system according to the third embodiment of the present application. The structure of the quench protection circuit in this embodiment is similar to the structure of the quench protection circuit in Embodiment 2, the difference is that in this embodiment, eight additional heaters such as H12-H82 are arranged in series in the second branch circuit S2, respectively It is thermally coupled with the superconducting coil unit L1-L8, and the resistance values ​​of eight additional heaters such as H12-H82 are respectively denoted by r 12 、r 22 、r 32 、r 42 、r 52 、r 62 、r72 and r 82 , and satisfy the following relationship:

[0073] r 12 + r 22 + r 32 + r 42 + r 52 + r 62 + r 72 + r 82 = r 1 (Formula 5)

[0074] Similarly, eight additional heaters such as H13-H83 are arranged in series in the third branch S3 to be thermally coupled with the superconducti...

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Abstract

The invention discloses a quench-of-superconductivity protection circuit for superconducting magnet system. The superconducting magnet system comprises a plurality of superconducting coil units in series connection. The quench-of-superconductivity protection circuit is in parallel to at least one of the superconducting coil unit and comprises a plurality of heaters and a multi-order branch. The heaters are thermally coupled with the superconducting coil units. The multi-order branch comprises a first-order branch and a second-order branch wherein the impedances of the two are different from each other. The heaters can be connected with the first-order branch and / or the second-order branch and the first-order branch and the second-order branch can be configured in parallel connection state and be electrically connected with the heaters; or only one branch of the first-order branch and the second-order branch is electrically connected with the heaters. In the invention, the multi-order branch can be formed as a relay type protection circuit so as to increase the stability and validity for quench-of-superconductivity transmission. In addition, the invention also proposes a quench-of-superconductivity protection method for superconducting magnet system.

Description

technical field [0001] The embodiments of the present application relate to a superconducting magnet used for magnetic resonance imaging, and in particular to a quench protection circuit and a quench protection method for a superconducting magnet system. Background technique [0002] As we all know, the magnet is one of the most important core components in the magnetic resonance imaging (MRI) system, which provides a uniform main magnetic field for the Larmor precession of the hydrogen atoms, so that the magnetic resonance phenomenon occurs under the excitation of the radio frequency field . Due to the super high cost performance, super stable uniformity and magnetic induction intensity, most of the mainstream magnets on the market are superconducting magnets, which use the zero resistance effect of superconducting coils arranged at predetermined positions at low temperatures to form a closed-loop mode with superconducting switches (persistentmode), and refer to Biot Savar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/00
CPCH02H7/001Y02E40/60
Inventor 宋啸坤
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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