State space controller, control method and gradient power amplifier

A state space and control method technology, applied to amplifiers, instruments, measuring devices, etc., can solve the problems affecting the speed of control execution, multiple parameters of the control algorithm, and high cost of the controller, so as to achieve simple control algorithm, few calculation parameters, and structure simple effect

Pending Publication Date: 2017-12-08
SHANGHAI NEUSOFT MEDICAL TECH LTD
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Problems solved by technology

However, the current state space controller generally has a complex structure, and the calculation of the control algorithm also requires more parameters, which not only makes the cost of the controller higher, but also affects the speed of control execution.

Method used

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  • State space controller, control method and gradient power amplifier
  • State space controller, control method and gradient power amplifier
  • State space controller, control method and gradient power amplifier

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Embodiment Construction

[0026] The exemplary embodiments will be described in detail here, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. Rather, they are only examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0027] In magnetic resonance imaging, a gradient magnetic field can be superimposed on the main magnetic field to obtain the spatial encoding of the received magnetic resonance signal, and the gradient magnetic field is obtained by exciting a gradient coil to generate a gradient current through a gradient power amplifier. figure 1 Illustrates the schematic diagram of the generation...

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Abstract

The invention provides a state space controller, a control method and a gradient power amplifier. The state space controller comprises an integrating part which is used for integrating control deviation which is acquired based on the difference between gradient coil current and reference current, and a delay compensator which is used for generating a digital control amount used for generating a pulse-width modulation driving signal according to the control deviation integrated by the integrating part. The delay compensator comprises a feedback loop which is used for multiplying the digital control amount by a predetermined multiple after a delay of N calculation periods and subtracting from the digital control amount, wherein the N is 1 or 2. According to the invention, a simple and fast state space control method is realized.

Description

Technical field [0001] The present disclosure relates to magnetic resonance imaging technology, in particular to a state space controller and control method, and a gradient power amplifier. Background technique [0002] MRI (Magnetic Resonance Imaging) can use radio frequency electromagnetic waves to excite substances containing nuclei with non-zero spins placed in a magnetic field to generate nuclear magnetic resonance, and use induction coils to collect magnetic resonance signals, according to certain mathematical methods A digital image created by processing. When the human body is scanned by MRI, the electromagnetic signal is obtained from the human body by the magnetic resonance phenomenon, and the human body information can be reconstructed. In order to spatially encode the received magnetic resonance signals and determine the slice selection or thickness of the MRI scan, a gradient magnetic field can be superimposed on the main magnetic field of the MRI, which has the sam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/385
CPCG01R33/385G01R33/3852G01R33/3607H03F2200/261
Inventor 成功徐勤
Owner SHANGHAI NEUSOFT MEDICAL TECH LTD
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