磁共振快速T/R开关驱动器研制

在磁共振T/R开关和主动失谐线圈中广泛使用PIN管,由外部驱动器向PIN管提供驱动电源,控制其导通或截止,从而达到开关切换和线圈失谐的目的.因此,驱动器的性能直接影响T/R开关和线圈的性能.该工作提出了一种新的T/R开关驱动器设计方案.电路中门控信号与驱动电源互相隔离,同时包含了场效应管死区调整电路,提高了电路稳定性和灵活性.该电路开关切换时间可达500 ns,驱动电压和电流理论上分别可达400 V和10 A以上,具有快速、驱动能力强等特点.可用于快速T/R开关和主动失谐线圈的驱动、缩短死时间、减小发射线圈和接收线圈间的耦合....

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Bibliographic Details
Published in波谱学杂志 Vol. 33; no. 1; pp. 37 - 43
Main Author 刁玉剑 谢君尧 徐俊成 蒋瑜
Format Journal Article
LanguageChinese
Published 上海市磁共振重点实验室,华东师范大学物理系,上海200062 2016
Subjects
MOSFET管
PIN管
T/R开关驱动器
光电隔离
大功率
核磁共振仪器
MOSFET
核磁共振仪器
T/R switch driver
T/R开关驱动器
NMR instrumentation
high power
大功率
PIN管
MOSFET管
PIN diode
optoelectronic isolation
光电隔离
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Summary:在磁共振T/R开关和主动失谐线圈中广泛使用PIN管,由外部驱动器向PIN管提供驱动电源,控制其导通或截止,从而达到开关切换和线圈失谐的目的.因此,驱动器的性能直接影响T/R开关和线圈的性能.该工作提出了一种新的T/R开关驱动器设计方案.电路中门控信号与驱动电源互相隔离,同时包含了场效应管死区调整电路,提高了电路稳定性和灵活性.该电路开关切换时间可达500 ns,驱动电压和电流理论上分别可达400 V和10 A以上,具有快速、驱动能力强等特点.可用于快速T/R开关和主动失谐线圈的驱动、缩短死时间、减小发射线圈和接收线圈间的耦合.
Bibliography:T/R switch is a device that switches between the radio frequency （RF） transmission path and the signal reception path, and enables rapid tuning and detuning of RF coils. PIN diodes are widely utilized in modem T/R switch and tunable coil configurations, given that they operate as variable resistors controlled by DC current at RF frequencies. Since the PIN diode can only work with a driver providing the forward or reverse bias supply, its performance is significantly influenced by the capability of the driver. This paper presents a driver design with high driving speed, and high voltage and current driving capabilities. In this design, the control signal was separated from the high power driving supplies. The driver had a switching time within 500 ns with an output voltage over 400 V and an output current over 10 A. It can be applied to drive fast and high-power T/R switches.
NMR instrumentation, T/R switch driver, optoelectronic isolation, PIN diode,high power, MOSFET
42-1180/O4
DIAO Yu-jian, XIE Jun-yao, X-UJun
ISSN:1000-4556
DOI:10.11938/cjmr20160103