摘要
为了研究高压纳秒脉冲的前后沿时间对于离体肿瘤细胞杀伤效果的影响,需要一种能够产生前后沿可调高压纳秒脉冲的发生器。提出了一种基于半桥型模块化多电平换流器(HB-MMC)结构的新型发生器拓扑结构,通过HB-MMC子模块的级联构成2组桥臂,以产生任意极性的高压纳秒脉冲方波;采用MOSFET作为固态开关,并通过控制MOSFET的开关时序,改变导通和关断延迟时间来改变输出脉冲的前后沿。该文首先对提出的发生器拓扑结构以及工作原理进行了详细的介绍;然后采用PSpice仿真软件进行仿真验证,证实了该拓扑结构的正确性与可行性;最后研制了一台5级的脉冲发生器并进行性能测试。测试结果表明,该发生器能够输出幅值0~±4kV可调、脉宽100~500ns可调、频率0~5kHz可调的方波脉冲,且脉冲的上升沿能在15~65ns范围内平滑调节,脉冲的下降沿能在30~100ns范围内平滑调节。
In order to study the influence of the rise/fall time of high-voltage nanosecond pulses on in vitro tumor cell killing effect,a high-voltage nanosecond pulse generator with adjustable rise/fall time is required.A novel generator topology based on half-bridge modular multilevel converter(HB-MMC)is proposed.Several HB-MMC submodules are connected in series as two arms to generate unipolar/bipolar high voltage nanosecond pulses.MOSFETs are used as solid-state switches.By controlling the switching sequence of the MOSFETs,the rise/fall time of the pulse can be adjusted.In this paper,the proposed topology and its operating principle are introduced in detail and verified by PSpice simulation software.A 5-stage generator was implemented and tested.The test results show that the generator can output nanosecond pulses with adjustable amplitude of 0~±4kV,pulse width of 100~500ns and frequency of 0~5kHz.The rising time of the pulse can be smoothly adjusted in the range of 15~65ns,and the falling time of the pulse can be smoothly adjusted in the range of 30~100ns.
作者
米彦
万晖
卞昌浩
彭文成
桂路
Mi Yan;Wan Hui;Bian Changhao;Peng Wencheng;Gui Lu(State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing 400044 China;Economic Research Institute of State Grid Jiangxi Electric Power Company,Nanchang 330096 China;State Grid Jiangsu Electric Power Company Technician Training Center,Suzhou 215000 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第6期1279-1289,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51477022)
重庆市科委自然科学基金(cstc2016jcyjA0500)资助项目。
关键词
前后沿可调
半桥型模块化多电平换流器
高压纳秒脉冲
开关时序
Adjustable rise/fall time
half-bridge modular multilevel converter(HB-MMC)
high voltage nanosecond pulses
switching sequence
