Transactions of China Electrotechnical Society  2021, Vol. 36 Issue (2): 435-444    DOI: 10.19595/j.cnki.1000-6753.tces.201110
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High Frequency Nanosecond Pulse Generator Based on Modular Multilevel Converter Structure with Auxiliary Charging Branch
Mi Yan, Chen Jiacheng, Xu Ning, Dai Jinyan
State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China

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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 wordsAuxiliary charging branch      modular multilevel converter (MMC)      conduction loss      nanosecond pulse train      generator     
Received: 30 August 2020     
PACS: TM832  
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Mi Yan
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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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