Chinese Journal of Magnetic Resonance >
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.
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.
HU Hong-bing , WANG Yan-long , ZHAO Hong-ju . A Control Technology for Gradient Amplifier Based on Multi-Frequency Shift[J]. Chinese Journal of Magnetic Resonance, 2015 , 32(1) : 78 -86 . DOI: 10.11938/cjmr20150109
[1] Fukuda H, Takano H, Hatakeyama T, et al. A unique digital control scheme of multiple bridges power conversion circuit for advanced magnetic resonance imaging//Proceedings of the 6th International Conference on Power Electroncis and Variable Speed Drives[C]. UK: IET, 1996. 366－371.
[2] Kawamura A, Haneyoshi T, Hoft R G. Deadbeat controlled PWM inverter with parameter estimation using only voltage sensor[J]. IEEE T Power Electr, 1988, 3(2): 118－125.
[3] Zhuang Hui(庄慧), Huang Su-hua(黄苏华), Yuan Guo-chun(袁国春). Phaselock and Frequency Synthesize Techniques(锁相与频率合成技术)[M]. Beijing(北京): China Meteorological Press(气象出版社), 1996.
[4] Zhu Tian-xiong(朱天雄), Liu Zao(刘造), Bao Qing-jia(鲍庆嘉), et al. A preamplifier system for water-cooled ultra-high field NMR spectrometers(基于水冷磁体的超高场核磁共振波谱仪前置放大器系统设计与实现)[J]. Chinese J Magn Reson(波谱学杂志), 2014, 31(2): 186－195.
[5] Wang Hui-wang(王恢旺), Li Zheng-gang(李正刚), Mao Wen-ping(毛文平), et al. The design of an integrated gradient field/frequency lock shim system for NMR spectrometer(一体化NMR波谱仪梯度场频联锁匀场系统设计)[J]. Chinese J Magn Reson(波谱学杂志), 2012, 29(4): 489－498.
[6] Fukuda, Nakaoka M. High-Frequency ZVS PWM Power Amplifier for Magnetic-Field Current Tracking Control Scheme and Its Design Considerations[C]. Proceedings of IEEE-PEDS, 1995: 238－245.
/
| 〈 |
|
〉 |