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Gradient power amplifier based on multistage coupling inductor optimized design

A power amplifier and coupled inductor technology, applied in the field of gradient power amplifiers based on the optimal design of multi-stage coupled inductors, can solve problems such as high cost and complex control circuits, achieve low output current ripple, improve performance indicators, and improve fast response. effect of ability

Active Publication Date: 2016-07-20
XINGAOYI MEDICAL EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual use, the control circuit is complicated and the cost is high

Method used

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  • Gradient power amplifier based on multistage coupling inductor optimized design
  • Gradient power amplifier based on multistage coupling inductor optimized design
  • Gradient power amplifier based on multistage coupling inductor optimized design

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 and figure 2 As shown, the gradient power amplifier based on the optimal design of multi-stage coupled inductors in this embodiment includes a PWM control circuit 1 , a power variation circuit 2 and a low-pass filter circuit 3 .

[0031] Wherein the PWM control circuit 1 can adopt a general-purpose PWM control circuit 1, the PWM control circuit 1 is respectively connected with the output terminal of the gradient control signal and the feedback terminal of the output current, and is used to process the feedback signal of the gradient control signal and the output current, so as to The control logic outputs a PWM control signal.

[0032] The power changing circuit 2 in this embodiment includes a first group of H bridge circuits 2A, a second group of H bridge circuits 2B, a third group of H bridge circuits 2C and a four...

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Abstract

The invention relates to a gradient power amplifier based on multistage coupling inductor optimized design. The gradient power amplifier comprises a PWM control circuit, a power change circuit connected with the PWM control circuit, and a low-pass filter circuit connected with the power change circuit and a load, wherein the low-pass filter circuit comprises a coupling inductor portion and a low-pass filtering capacitor portion. The coupling inductor portion is connected between the power change circuit and the low-pass filtering capacitor portion, and the coupling inductor portion has at least two stages of coupling inductors. The gradient power amplifier employs multistage of coupling inductors, maximizes the rapid response capability of the gradient power amplifier, and further realizes low output current ripples.

Description

technical field [0001] The invention relates to a gradient power amplifier used in a magnetic resonance imaging system, in particular to a gradient power amplifier based on the optimized design of multi-stage coupled inductors. Background technique [0002] With the continuous improvement of medical level, nuclear magnetic resonance imaging equipment has been widely used. The gradient power amplifier is one of the core components of the magnetic resonance imaging system. With the continuous improvement of the magnetic resonance imaging technology, the system puts forward higher requirements on the performance of the gradient power amplifier. The US patent "pulse-width modulated circuit for driving a load" with the patent number US005070292 discloses a similar topology for MRI gradient power amplifiers. In this patent, the ordinary filter inductor is changed to a coupled inductor, which is beneficial to reduce the output current. ripple, increasing system bandwidth. At the ...

Claims

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Application Information

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IPC IPC(8): G01R33/38H02M1/14
CPCG01R33/38H02M1/14
Inventor 吴继锋李应良高大建
Owner XINGAOYI MEDICAL EQUIP CO LTD