Parameter optimization design of snubber circuit for high voltage protection switch

Li Zhiheng; Ma Shaoxiang; Zhang Hongqi; Zhu Bangyou; Zhang Ming; Yu Kexun; Pan Yuan

doi:10.11884/HPLPB202436.230158

Volume 36 Issue 2

Jan. 2024

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Li Zhiheng, Ma Shaoxiang, Zhang Hongqi, et al. Parameter optimization design of snubber circuit for high voltage protection switch[J]. High Power Laser and Particle Beams, 2024, 36: 025009. doi: 10.11884/HPLPB202436.230158

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Li Zhiheng, Ma Shaoxiang, Zhang Hongqi, et al. Parameter optimization design of snubber circuit for high voltage protection switch[J]. High Power Laser and Particle Beams, 2024, 36: 025009. doi: 10.11884/HPLPB202436.230158

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Parameter optimization design of snubber circuit for high voltage protection switch

doi: 10.11884/HPLPB202436.230158

International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Received Date: 2023-05-30
Accepted Date: 2023-09-19
Rev Recd Date: 2023-09-07

Available Online: 2023-11-09

Publish Date: 2024-01-12

Abstract

Abstract

The ion source and electron gyrotron of the fusion auxiliary heating system are prone to failure and expensive. To protect them, it is necessary to study the high voltage switch scheme. The parameter design methods of high voltage protection switch snubber circuit are lack of relevant theoretical design methods currently, and the snubber circuit schemes are isoparametric design schemes because the influence of distributed capacitance is not taken into account in the design process. The voltage-balancing effect of this method is not ideal. To solve the problems existing in the current parameter design, we have established the MOSFET model with snubber circuit and stray inductor and analyze its turn-off process, thus to obtain the theoretical design method and expression of snubber circuit for suppressing voltage spike. Taking the distributed capacitance into consideration in series voltage-balancing and constructing the isoelectric point, we have established and analyzed the equivalent circuit, and obtained the non-equal parameter design method and expression of snubber circuit according to the charge equation. This parameter design method can compensate the uneven voltage distribution caused by distributed capacitance and guide the voltage-balancing scheme design of high voltage protection switch better. To verify the rationality of the parameter design, we have a carried out, simulation analysis. which shows that the overall design scheme can meet the design requirements of peak suppression and voltage-balancing.
- high voltage switch,
- snubber capacitance,
- snubber resistance,
- distributed capacitance,
- voltage-balancing

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References(17)

References

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