High-voltage high-current small-ripple-wave gradient amplifier

A gradient amplifier, high-current technology, applied in instruments, measuring magnetic variables, measuring devices, etc., can solve the problems of high volume and cost, single high-voltage power conversion structure, inability to realize high-frequency switching, etc., to reduce hardware costs and simplify Design difficulty and the effect of improving system efficiency

Active Publication Date: 2014-11-12
LIAONING KAMPO MEDICAL SYST
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Problems solved by technology

The gradient amplifiers commonly used at this stage all adopt a single high-voltage power conversion structure
In the current period or even for a period of time, high-voltage power devices cannot achieve high-frequency switching. With the continuous increase in high-voltage voltage requirements, a single high-voltage power conversion structure cannot ac

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  • High-voltage high-current small-ripple-wave gradient amplifier
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  • High-voltage high-current small-ripple-wave gradient amplifier

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] Gradient amplifier of the present invention such as figure 1 As shown, it consists of signal processing and control part 1-1, high voltage power conversion part 1-2, low voltage power conversion part 1-3 and low pass filter part 1-4.

[0034] The system adopts the combination of high-voltage power conversion and low-voltage power conversion, which can automatically select high-voltage power conversion and low-voltage power conversion according to the characteristic identification information of the signal, and through signal processing and frequency conversion optimization, a PWM control signal for driving the power part is formed, and the power part outputs Partially filtered by the low-pass filter, the gradient coil is driven to produce the desired fast switching, low-ripple target gradient field.

[0035] like figure 2 Shown, sign...

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Abstract

The invention relates to a high-voltage high-current small-ripple-wave gradient amplifier which is used for driving a gradient coil and further generating a gradient field needed by imaging of a magnetic resonance system. The high-voltage high-current small-ripple-wave gradient amplifier is composed of a signal processing and controlling part, a high-voltage power conversion part, a low-voltage power conversion part and a low-pass filtering part. The high-voltage high-current small-ripple-wave gradient amplifier can use different power conversion parts according to different characteristics of input and output signals, the needed target gradient field is generated rapidly and accurately by outputting filtering waves, and output ripple-wave current is reduced as mush as possible. The gradient amplifier can simplify the design of a high-voltage high-current amplifier, reduce hardware cost, improve system efficiency and optimize the performance of a gradient system to the maximum extent.

Description

technical field [0001] The invention relates to a gradient amplifier for generating and controlling pulse currents in gradient coils in a magnetic resonance imaging system. Background technique [0002] The gradient system refers to all circuit units related to the gradient magnetic field. Its function is to provide the system with a rapidly switchable gradient field with linearity and precision that meets the requirements, so as to dynamically modify the main magnetic field and realize the spatial positioning of imaging voxels. In the gradient system, the control signal generated by the gradient waveform generator is used as the input of the gradient amplifier, and the current output of the gradient amplifier drives three sets of gradient coils to generate a gradient field in the imaging space, giving the spatial coordinates of the imaging site, so that each pixel in the image is consistent with the human body. One-to-one correspondence of imaging parts. [0003] The grad...

Claims

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Application Information

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IPC IPC(8): G01R33/385
Inventor 孔祥林吴继锋施金泉卢广
Owner LIAONING KAMPO MEDICAL SYST
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