波谱学杂志 ›› 2015, Vol. 32 ›› Issue (1): 78-86.doi: 10.11938/cjmr20150109

• 研究论文 • 上一篇    下一篇

基于倍频移相的梯度放大器控制技术

胡红兵*,王延龙,赵红菊   

  1. 东软医疗设备系统有限公司,辽宁 沈阳 110179
  • 收稿日期:2014-07-02 修回日期:2015-01-08 出版日期:2015-03-05 发布日期:2015-03-05
  • 作者简介:胡红兵(1967-),男,湖北人,博士,电话:024-83665640,E-mail: huhb@neusoft.com. *通讯联系人.
  • 基金资助:

    *Corresponding author:HU Hong-bing, Tel: +86-024-83665640, E-mail: huhb@neusoft.com.

A Control Technology for Gradient Amplifier Based on Multi-Frequency Shift

HU Hong-bing*,WANG Yan-long,ZHAO Hong-ju   

  1. Neusoft Medical System Cooperation Limited, Shenyang 110179, China
  • Received:2014-07-02 Revised:2015-01-08 Online:2015-03-05 Published:2015-03-05
  • Supported by:

    *Corresponding author:HU Hong-bing, Tel: +86-024-83665640, E-mail: huhb@neusoft.com.

摘要:

提出了一种基于倍频移相的梯度放大器控制技术,该系统利用PLL 形成相位差通过IGBT 全桥拓扑结构以及输出功率电感并联电流输出.通过输出端闭合反馈系统和各个桥臂的均流控制反馈,实现大功率、低纹波、低噪声的电流输出.将该控制方法用于自主研制开发的梯度放大器上进行实验验证,测试得到的电流精度、纹波、噪声均达到指标要求,结果证明该设计方案具有可行性.

关键词: 倍频移相, 梯度放大器, 核磁共振成像, IGBT

Abstract:

Based on multi-frequency shift, a novel technology was proposed for controlling gradient amplifier in magnetic resonance imaging. Phase-locked-loop (PLL) circuit was used to achieve phase shift, and insulated-gate bipolar transistor (IGBT) full-bridge to achieve parallel output current and output power inductor. An output negative feedback system and average current control on every bridge were used to achieve high power, low ripple and low noise current output for the amplifier. The technology was validated on a custom-made gradient amplifier.

Key words: multi-frequency shift, gradient amplifier, magnetic resonance imaging, insulated-gate bipolar transistor

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