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Gradient amplifier and modulation method thereof

A gradient amplifier and modulation method technology, which is applied to amplifiers, amplifiers with semiconductor devices/discharge tubes, instruments, etc., can solve the problems of radio frequency interference imaging, large ripple current, etc., to reduce interference, reduce voltage and current stress, The effect of reducing the ripple

Active Publication Date: 2017-05-31
SHANGHAI NEUSOFT MEDICAL TECH LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of this application is to provide a gradient amplifier and its modulation method to solve the technical problem of radio frequency interference imaging caused by the large ripple current output when the gradient amplifier in the prior art is working.

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  • Gradient amplifier and modulation method thereof
  • Gradient amplifier and modulation method thereof

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] A gradient amplifier provided in an embodiment of the present application is applied to a gradient system of a magnetic resonance system. The gradient amplifier in this embodiment may include the following structure:

[0030] Multiple working half-bridge groups, such as 2, 3 or 4 or other working half-bridge groups, each working half-bridge group includes two working half-bridges, and each working half-bridge includes two IGBTs respectively , and the em...

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Abstract

The invention discloses a gradient amplifier and a modulation method thereof. The gradient amplifier comprises a plurality of service half-bridge groups, every service half-bridge group consists of two service half-bridges, every service half-bridge is composed of two IGBTs (insulated gate bipolar transistors), and an emitting electrode of one IGBT in every service half-bridge is connected with a collecting electrode of the other IGBT in the service half-bridge. In every service half-bridge group, a gradient coil is connected between connection points of the two IGBTs in every service half-bridge, so that output current of a power supply flows through one IGBT of one service half-bridge in every service half-bridge group and the gradient coil and then the other IGBT of the other service half-bridge in the service half-bridge group. The gradient amplifier has the advantages that the service half-bridges serve as main power devices, the current flowing through the gradient coils is superimposed N-channel current, and accordingly operation frequencies of the gradient coils are superimposed and ripple waves of the current flowing through the gradient coils are reduced.

Description

technical field [0001] The present application relates to the technical field of nuclear magnetic resonance, in particular to a gradient amplifier and a modulation method thereof. Background technique [0002] The magnetic resonance system is mainly composed of a magnet, a gradient system, a radio frequency system, a refrigeration system, a reconstruction system and an operating system. Among them, the magnet provides a uniform and stable main magnetic field for magnetic resonance imaging, while the gradient system provides spatial encoding for the magnetic resonance system. It passes coils of different shapes inside the main magnetic field to form gradients in the directions of X, Y and Z. magnetic field. The gradient system mainly includes three parts: the gradient waveform generator, the gradient amplifier and the load, namely the gradient coil. [0003] Among them, the gradient amplifier is used as the power electronic component of the driving coil. It consists of a hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/385
CPCG01R33/3852H03F3/2173H03F2200/351G01R33/246H03F3/3081
Inventor 蔡冬日
Owner SHANGHAI NEUSOFT MEDICAL TECH LTD
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