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Digital variable frequency PWM (Pulse Width Modulation) gradient amplifier with adaptively-controlled load

A technology of adaptive control and gradient amplifier, which is applied in the direction of instruments, measuring magnetic variables, measuring devices, etc., can solve the problems that the performance of the gradient system cannot be optimized to the greatest extent, and achieve the effects of improving work efficiency, reducing hardware costs, and optimizing performance

Active Publication Date: 2012-06-20
LIAONING KAMPO MEDICAL SYST
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Problems solved by technology

This control implementation method cannot optimize the performance of the gradient system to the greatest extent, and cannot maximize the performance of the system

Method used

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  • Digital variable frequency PWM (Pulse Width Modulation) gradient amplifier with adaptively-controlled load
  • Digital variable frequency PWM (Pulse Width Modulation) gradient amplifier with adaptively-controlled load
  • Digital variable frequency PWM (Pulse Width Modulation) gradient amplifier with adaptively-controlled load

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] Gradient amplifier of the present invention such as figure 1 As shown, it consists of digital control and processing part (1-1) (including processing devices and algorithms for realizing adaptive control and digital variable frequency PWM), power part (1-2) (realizing voltage-current conversion) and output signal detection Part (1-3) composition.

[0032] The system adopts full digital signal processing, which can automatically adjust the best PID control parameters according to the load conditions of different gradient coils, and through digital signal processing and digital frequency conversion, it forms a PWM control signal for driving the power part, and the current output of the power part drives Gradient coils that generate the desired target gradient field. The system can automatically adjust and optimize the corresponding PID ...

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Abstract

The invention relates to a digital variable frequency PWM (Pulse Width Modulation) gradient amplifier with an adaptively-controlled load. The digital variable frequency PWM gradient amplifier is used for driving a gradient coil to further generate a gradient filed required for imaging of a magnetic resonance system. The digital variable frequency PWM gradient amplifier with the adaptively-controlled load comprises a digital controlling and processing part, a power part and an output signal detecting part. The digital variable frequency PWM gradient amplifier with the adaptively-controlled load, disclosed by the invention, can be used for automatically adjusting the optimal PID (Proportional-Integral-Derivative) parameter according to different output loads, forming a PWM control signal ofdriving the power part through digital signal processing and digital frequency conversion and generating the required target gradient field. The gradient amplifier provided by the invention is capable of reducing hardware cost, increasing work efficiency and optimizing the gradient system performance to the maximum extent.

Description

technical field [0001] The invention relates to a gradient amplifier especially for a magnetic resonance imaging system. The gradient amplifier is used to generate and control the pulse current in the gradient coil in the 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...

Claims

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Application Information

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IPC IPC(8): G01R33/385
Inventor 孔祥林吴继峰施金泉张丙春卢广
Owner LIAONING KAMPO MEDICAL SYST
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