Papers by Keyword: Thyristor

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Authors: Anant K. Agarwal, Sei Hyung Ryu, Ranbir Singh, Olof Kordina, John W. Palmour
Authors: Jeff B. Casady, Anant K. Agarwal, L.B. Rowland, R.R. Siergiej, S. Seshadri, S. Mani, J. Barrows, D. Piccone, P.A. Sanger, C.D. Brandt
Authors: Anant K. Agarwal, Sumi Krishnaswami, Ben Damsky, Jim Richmond, Craig Capell, Sei Hyung Ryu, John W. Palmour
Abstract: We report on the development of the first 1 cm x 1 cm SiC Thyristor chip capable of blocking 5 kV. This demonstrates the present quality of the SiC substrate and epitaxial material. A forward drop of 4.1 V at 100 A and 25°C has been measured. The turn-on delay is found to be a strong function of the gate current. At a gate current of 0.5 A, a turn-on delay of 250 ns is observed for an anode to cathode current of 200 A. The turn-on delay reduces to 72 ns for an IG = 1.5 A. The turn-on rise time is a strong function of the anode to cathode voltage, VAK. At VAK =230 V, the turn-on rise-time is 300 ns for IAK =200 A. The rise-time reduces to 26 ns for VAK = 500 V.
Authors: Pierre Brosselard, Thierry Bouchet, Dominique Planson, Sigo Scharnholz, Gontran Pâques, Mihai Lazar, Christophe Raynaud, Jean-Pierre Chante, Emil Spahn
Abstract: Overcoming the physical limits of silicon, silicon carbide shows a high potential for making high voltage thyristors. After a simulation based optimization of the main thyristor parameters, including JTE protection and a SiO2 layer passivation, 4H-SiC GTO thyristors were realized and characterized. Designed for a theoretical blocking capability of nearly 6 kV, the electrical characterization of all device structures revealed a maximum blocking voltage of 3.5 kV. Comparing simulation and measurement suggests that a negative oxide charge density of ~ 2×1012 cm-2 causes the decrease in electrical strength.
Authors: Ke Zhu, Xiao Hui Lu, Bo Zhang
Abstract: It is very important for a distributed generating system to have an islanding detection part. Focused on the problem of islanding, this paper proposes a new and effective islanding detection scheme: a thyristor is placed between any two phases just by the port of the distributed generator (DG). An artificial short time phase to-phase short circuit is formed by triggering the thyristor periodically when the voltage between this thyristor is almost equal to zero, so the short-circuit current and voltage pulse can be extracted out. Because that short-circuit current and voltage pulse contain plentiful frequency components, the frequency response of system can be acquired according to the theory of harmonic impedance, so that the impedance measured from DG port can be obtained. Whether the DG is islanding can be determined quickly by monitoring the changes of impedance. This method is proved to be correct and effective by theoretical analysis and simulation.
Authors: Zheng Wang Xu, Hui Wang
Abstract: Among the modern industry, soft-starter has taken an important role in large-capacity motor systems. But all kinds of using soft-starters have some shortcomings, their application is restricted because of that. This article describes a type of solid-state soft-starter with a novel structure, in which a rectifier bridge structure is used in stead of the traditional antiparallel structure. Its same points and differentia are analyzed comparing with the traditional soft-starters. The new soft-starter overcomes some traditional shortcomings. It can be used for both low voltage and high voltage motor starting. Especially, when applied to a high-voltage motor starting, it has the advantage of simple structure and high reliability. This kind of soft-starters can be used in broad application prospects.
Authors: Huan Li, Hong Fa Ding, Hou Xiu Xiao
Abstract: This paper presents a Repeated Pulsed High Magnetic Field (RPHMF) generator for frequency-tunable terahertz sources, which mainly consists of a charging power supply, a capacitor bank, a discharging switch, a bitter magnet and other facilities. The four thyristors (80 mm, 4 kV) in series with a self-supplied gate driver are taken as the discharge switch which can be triggered when the high voltage capacitor C was charged to 300 V. Meanwhile, a bitter magnet with fast heat dissipation was designed and fabricated. According to the experiment, the designed system has a pulse repetition frequency of 0.1 Hz with a maximum magnetic field of 9 T.
Authors: Zhong Lin Zhang, Qian Hui Gang, Peng Qiu, Shu Han Wang, Cong Yu Bai
Abstract: The high-voltage SVC realizes the dynamic reactive power compensation through the real-time control over the breakover and cut-off of thyristor. Because the current passing through thyristor is large, the frequent break-make will lead to a lot of thermal loss, so it should be cooled in time. The self-cooled heat pipe cooling system is a traditional high-voltage SVC cooling system, which is expensive and heavy because it adopts relatively expensive copper product and aluminium product.This paper introduces a new heat pipe radiator. Compared to the traditional heat pipe radiators, it is light in weight, small in volume and low in cost. The performance test shows that the thermal resistance of the radiator is 0.064°C/W, that the main performance indexes are superior to those of the similar heat pipe radiators at home and abroad and that its self-cooling ability has achieved a high level. Therefore, it will greatly promote the promotion and application of this technology in China.
Authors: Yoshitaka Sugawara
Abstract: To achieve large current capability in spite of present small SiC devices that are limited by various crystal defects, focus was placed on SiC GTO thyristor and SICGT have been developed as an advanced SiC GTO. SICGTs with current capability of 1.6-100 A and blocking voltage of 3-12.7 kV and a 3 phase PWM SICGT inverter with output power of 35 kVA have been successfully developed. Furthermore, application of the SiC inverter aimed to a load leveling system was demonstrated.
Authors: Xin Lin Long, Jun Yong Lu, Xiao Zhang, Chao Li, Hai Feng Wu
Abstract: The power energy storage in battery transfers to capacitors through thyristor in hybrid energy storage, which makes the instantaneous power amplified. As the switch in Hybrid energy storage, the thyristor must satisfy its opening requirements , besides, the characteristics of the hybrid energy storage system is considered to design the width of trigger pulse, otherwise the thyristor can’t be opened that leads to failure of energy transfer. In this paper, the model of the system is established, the function of current to time is derived from the model, and then the minimum width of trigger pulse is calculated out. The simulation and experiment results are presented, which match with the designation well.
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