A simple model of high-power thyristor and its application in EML transient analysis

Zhou, Yuejin; Yan, Ping; Sun, Yaohong; Wang, J.; Li, M.T.

doi:10.1109/ppc.2009.5386407

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…This figure shows that the pulse power supply is modulated from 110 ACV to the experiment requires AC potential (0~600 ACV), then rectifies DCV, and then charges the capacitor stack. Regarding the function to provide pulse electricity power for the energizing section of the electromagnetic rail [26][27][28][29][30], in this study, the capacitor stack contained 42 capacitors (2200 µF/450 DCV) and was configured in parallel to obtain a total capacitance of 0.0924 F. In order to respond the electrical limitations of component, the operating voltage set in this experiment was 300 DCV. It can be calculated from Equation (1) that the output energy of the pulse power supply in this experiment is 4158 Joules.…”

Section: Preparation Of Small Electromagnetic Catapult Experiments Eq...mentioning

confidence: 99%

Effect of Nickel–Phosphorus and Nickel–Molybdenum Coatings on Electrical Ablation of Small Electromagnetic Rails

et al. 2020

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The electromagnetic rail catapult is a device that converts electrical energy into kinetic energy, which means that the strength of electrical energy directly affects the muzzle speed of armature. In addition, the electrical conductivity, electromagnetic rails and armature surface roughness, and the holding force of the rail are influencing factors that cannot be ignored. However, the electric ablation on the surface of the electromagnetic rails caused by high temperatures seriously affects the service life performance of the electromagnetic catapult system. In this study, electrochemically deposited nickel-phosphorus and nickel-molybdenum alloy coatings are plated on the surface of electromagnetic iron rails and their effects on the reduction of ablation are investigated. SEM (scanning electron microscopy) with EDS (energy dispersive spectroscopy) detector, XRD (X-ray diffraction), 3D optical profiler, and Vickers microhardness tester are used. Our results show that the sliding velocity of the armature decreases slightly with the increased roughness of the rail coating surface. On the other hand, the area of electric ablation on the rail surface is inversely related to the hardness of the rail material. The electrically ablated surface areas of the rails are in: annealed nickel–molybdenum < nickel–molybdenum < annealed nickel–phosphorus < nickel–phosphorus < iron material. Heat treatment at 400 and 500 °C, respectively for Ni–P and Ni–Mo alloys, significantly increases hardness due to the precipitation of intermetallic compounds such as Ni3P and Ni4Mo phases. Comprehensive data analysis shows that the annealed nickel–molybdenum coating has the best electrical ablation wear resistance. The possible reason for that might be attributed to the high hardness of the heat-treated nickel–molybdenum coating. In addition, the thermal resistance capability of molybdenum is better than that of phosphorus, which might also contribute to the high wear resistance to electric ablation.

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Section: Preparation Of Small Electromagnetic Catapult Experiments Eq...mentioning

confidence: 99%

Effect of Nickel–Phosphorus and Nickel–Molybdenum Coatings on Electrical Ablation of Small Electromagnetic Rails

et al. 2020

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Parameter Optimization of Thyristor Snubber Circuit in LSTF Quench Protection System

Wei

et al. 2019

IEEE Access

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The Large-scale Superconductor Test Facility (LSTF) is an important part of comprehensive research facilities in support of China Fusion Engineering Test Reactor (CFETR). In order to protect the superconducting magnets from being damaged in quench accident, the Quench Protection System (QPS) should be designed to commutate the energy stored in the coils. The snubber circuit is used to reduce the reverse recovery current and voltage of thyristor in QPS, and it can impact the reliability and stability of the QPS. In general, the studies of snubber circuit are focused on the DC turn-off process of thyristor used in HVDC, which has small turn-off current. However, the turn-off current can reach to 100 kA in the QPS of LSTF. In this paper, a thyristor reverse recovery model is described, and the key parameters of reverse recovery current are obtained from the testing experiment. Based on the transient analysis of snubber circuit, a systematic approach is used to minimizing the resistance and capacitance of snubber circuit of QPS working condition is proposed. By the MATLAB simulation and comparison, minimum parameters of snubber circuit were obtained, and proved that the approach can improve the reliability and stability of system, while reduce the cost of QPS.

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Modeling and experiment research on turn-off characteristics of pulsed power thyristor

Tian

Dai

Lin

et al. 2016

2016 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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A simple model of high-power thyristor and its application in EML transient analysis

Cited by 3 publications

References 8 publications

Effect of Nickel–Phosphorus and Nickel–Molybdenum Coatings on Electrical Ablation of Small Electromagnetic Rails

Effect of Nickel–Phosphorus and Nickel–Molybdenum Coatings on Electrical Ablation of Small Electromagnetic Rails

Parameter Optimization of Thyristor Snubber Circuit in LSTF Quench Protection System

Modeling and experiment research on turn-off characteristics of pulsed power thyristor

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