基于倍频移相的梯度放大器控制技术
收稿日期: 2014-07-02
修回日期: 2015-01-08
网络出版日期: 2015-03-05
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
Received date: 2014-07-02
Revised date: 2015-01-08
Online published: 2015-03-05
Supported by
*Corresponding author：HU Hong-bing, Tel: +86-024-83665640, E-mail: huhb@neusoft.com.
胡红兵 , 王延龙 , 赵红菊 . 基于倍频移相的梯度放大器控制技术[J]. 波谱学杂志, 2015 , 32(1) : 78 -86 . DOI: 10.11938/cjmr20150109
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.
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