基于辅助充电支路的模块化多电平变换器结构高频纳秒脉冲发生器

doi:10.19595/j.cnki.1000-6753.tces.201110

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Abstract

High-frequency nanosecond pulse trains have gradually developed into a new medical treatment for tumors, but the problem of switching loss when the generator outputs high-frequency pulses trains needs further study. Therefore, this paper proposes a new generator topology based on the modular multilevel converter (MMC) structure with auxiliary charging branch. A diode and a resistor are connected in parallel at a MOSFET of MMC to provide a charging circuit for the capacitor and eliminate the conduction loss of the switch caused by the charging current, thereby improving the stability of the pulse generator. First, the principle of the topology proposed in this paper was introduced. Second, hardware parameters were calculated and Pspice was used to simulate and verify the topology. Finally, a 5-level modular output device was developed and tested. In continuous output mode, the rising time is 20ns, the falling time is 30ns, and the amplitude is 4kV. In pulse train output mode, the pulse width of a pulse train is 100~500ns, the highest frequency is 1MHz, and the amplitude is 0~4kV. The test shows that the RD-MMC can reduce the temperature rise of the tail-cut switch by about 30% compared with MMC under the test conditions. Moreover, using the cell solution as a load, the voltage and current waveforms are stable. The pulse generator developed in this paper lays a foundation for further study on the application of high-frequency nanosecond pulse trains in the biological field.

Key words： Auxiliary charging branch modular multilevel converter (MMC) conduction loss nanosecond pulse train generator

Received: 30 August 2020

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TM832

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	Mi Yan
	Chen Jiacheng
	Xu Ning
	Dai Jinyan

Cite this article:

Mi Yan,Chen Jiacheng,Xu Ning等. High Frequency Nanosecond Pulse Generator Based on Modular Multilevel Converter Structure with Auxiliary Charging Branch[J]. Transactions of China Electrotechnical Society, 2021, 36(2): 435-444.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201110 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I2/435

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