共查询到19条相似文献,搜索用时 177 毫秒
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GTO门极触发电路的设计 总被引:1,自引:0,他引:1
GTO门极触发电路的设计山东工业大学张庆范(济南250014)山东师范大学裴素华,庄益利(济南250014)TheDesignofGTOGateTriggeringCircuit¥//1前言该电路是为感应电动机的GTO斩波器设计的触发电路。它应用于感... 相似文献
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对1MW大功率GTO直流斩波器的缓冲器、门极驱动器及保护系统进行了探索、并采用EMTP程序对在受控核聚变负载条件下的大功率GTO直流斩波器的瞬态过程进行了动态仿真。 相似文献
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缓冲电路参数值对GTO的关断性能及整个GTO逆变器的工作性能起着至关重要的作用。本通过对GTO关断过程中阳极电流与阳极电压波形的分析,提出一种以“综合指标”作为目标函数的缓冲电路参数寻优方案,可根据对GTO装置性能的具体要求确定GTO缓冲电路元件的最佳参数。 相似文献
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本文介绍了矿用架线电机车新型IGBT斩波器。斩波器用门极可控的IGBT作为开关器件,省去了晶闸管斩波器的强迫换流电路,提高了系统的可靠性。本文给出了主电路原理图并提出了斩波器所采用的改进缓冲电路参数选择原则,对斩波器的过电流保护问题进行了分析。 相似文献
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新型功率器件(IGCT)的工作原理及其设计技术 总被引:19,自引:2,他引:17
阐述了新型功率半导体器件--集成门极换向型晶闸管IGCT(InjtegratedGate Commutated Thyristor)的基本工作原理和关键设计技术。IGCT在GTO技术的基础上,采用硬驱动技术,集成其门极驱动电路和反并联二极管,省去了吸收电路,兼具GTO爱损耗低和IGBT关断均匀的特点。由于其开关频率高,易于串联,故适合在中电压大功率领域使用。 相似文献
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IGCT和IEGT——适用于STATCOM的新型大功率开关器件 总被引:13,自引:3,他引:10
硬驱动概念的出现极大地改进了门极可关断晶闸管(GTO)的关断性能,并导致了集成门极换向型晶闸管(IGCT)的出现。IGCT在GTO技术的基础上,采用新技术集成了硬驱动门极驱动电路及反并联二析管。使器件不需关断吸收电路、可靠性更高、工作频率更高、易于串联工作.电子注入增强门极晶体管(IEGT)是东芝公司于1993年开发出的一代电力电子器件。它具有通态压降低、门极驱动简单、开关损耗小、串联运行容易等诸多优点。IGCT和IEGT的将逐步取代GTO广泛应用于中等电压大容量变流器中,文中简要地介绍了IGCT和IEGT的基本结构、工作原理、性能比较,以及在静止补偿器和逆变器中的应用情况。 相似文献
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应用专家系统理论和模糊理论建立了可关断晶闸管(GTO)无破坏测试模糊专家系统(GTO NDTFES)。GTO NDTFES主要具有两种功能:测试GTO的最大可关断阳极电流IATO和判断GTO的性能优劣。为了表达“GTO临近其关断极限”这一模糊概念,文章首次提出了“安全隶属度”的概念,并提出了用特征量的当量值变化的拟合曲线以确定安全隶属度垢模糊推理方法。提出了用极小-极大法则进行了模糊推理以评价GT 相似文献
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Hideo Okayama Taichiro Tsuchiya Yasuhito Shimomura 《Electrical Engineering in Japan》1997,120(2):41-48
Increase in the capacity of GTOs has made remarkable progress in recent years. At present, 4.5-kV, 4.0-kA GTOs are commercially available, and 6.0-kV, 6.0-kA GTOs made from 6-inch silicon wafers are appearing. The 6-inch GTOs will be applied to our three-level GTO inverter system. In order to apply GTOs to voltage-source inverters, snubber circuits are necessary for limiting on the turn-on di/dt and turn-off dv/dt. To realize high efficiency of the system, regenerative snubber circuits are often applied. A conventional circuit applied to three-level GTO inverters had the problem of long paths created for snubber circuits of the inner GTOs. Another circuit using a current transformer for recovering the energy trapped in the snubber circuits of the inner GTOs has been presented. In this paper, a new regenerative snubber circuit is proposed, which is more suitable for three-level GTO inverter systems with many phase-legs. By applying the snubber circuit, all snubber energy generated by each GTO switching can be regenerated to the dc link. In addition, high current turn-off performance of both the inner and the outer GTOs is verified by several successful experimental results using 6-inch 6.0-kV, 6.0-kA GTOs. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 120(2): 41–48, 1997 相似文献
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A novel snubber circuit for high-power GTO inverters is composed of only passive components which, idealized, produce no losses. The stored energy in the turn-on and turn-off snubbers is completely recovered during a switching cycle. In the absence of a permanent circulating current in the recovery transformer, the minimum on-time duration of one half-bridge is very low. The nondissipative operation of the snubber circuit permits a liberal design of the snubber components by which the switching losses in the power semiconductors are greatly reduced 相似文献
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一般缓冲电路的模型及三电平IGBT变流器内外元件电压不平衡机理 总被引:5,自引:2,他引:3
通过对斩波器中缓冲电路工作过程的分析 ,提出了一般缓冲电路的模型。根据这个模型 ,分析了中点箝位式(NPC)三电平变流器中内外绝缘栅双极型晶体管 (IGBT)电压不平衡的原因。并指出电压不平衡是由于NPC三电平的特殊结构和电路中的杂散电感造成的。实验波形证明了模型的正确性和分析的有效性。 相似文献
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Deacon J.A. van Wyk J.D. Schoeman J.J. 《Industry Applications, IEEE Transactions on》1989,25(2):292-297
Aspects of the application of resonant snubber technology to gate-turn-off (GTO) converters are investigated. GTO power switches require snubbing at turn-off when applied in converters. This leads to the extensive use of regenerative snubber circuits in GTO converters due to the difficulties involved in using dissipative snubbers. At present, it is accepted that the repetition switching frequency of GTO pulse-width modulated (PWM) circuits is largely determined by the resettling time of regenerative snubbers. The resonant DC link may be seen as a nondissipative snubber and holds the promise of a faster resettling time. The behavior of GTO devices is investigated under the conditions applied to them by this kind of snubbing and its application in GTO converters. The concept has been demonstrated with 90 A 1200 V GTOs 相似文献
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Kawakami N. Ueda S. Hombu M. Ueda A. Jifuku Y. 《Industry Applications, IEEE Transactions on》1993,29(6):1084-1089
A large-capacity inverter using high-power gate turn-off (GTO) thyristors that can be used instead of a cycloconverter in AC drives is presented. With the techniques of multiple configuration and GTO series connection, the inverter capacity is increased effectively. High conversion efficiency is obtained by using low-loss snubber circuits for GTOs. It is confirmed that the low-loss snubber circuits using energy recovery units (ERUs) have good performance in pulse-width modulated (PWM) operation. High-energy recovery efficiency is obtained, especially in leading operation (turn-on operation when freewheeling diodes conduct). These snubber circuits have superior ability for clamping overvoltage at GTO turn-off. A 2750 kVA inverter with low-loss snubber circuits using high-power GTOs has been fabricated and evaluated 相似文献
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在低压直流微电网发生短路故障时,直流固态断路器(Solid-state circuit breaker, SSCB)可以快速有效地将故障区域隔离,然而它自身的安全可靠性依赖于缓冲电路。由于SSCB上的缓冲电路的侧重点是过电压抑制能力和故障能量的快速吸收,而不是减少缓冲电路的损耗,所以不能直接使用适用于变换器器件的传统缓冲电路设计方法。因此,提出一种拥有过电压抑制能力的SSCB缓冲电路的设计方法。针对放电阻止型RCD缓冲电路进行保护动作后缓冲机理分析,选定三种性能指标并给出详细的参数设计步骤,然后选定工况计算出合适的缓冲参数。最后通过实验验证了上述分析结果的正确性和放电阻止型缓冲电路的有效性。 相似文献
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Kazuhiro Umetani Fujiyuki Iwamoto Keisuke Yagyu 《IEEJ Transactions on Electrical and Electronic Engineering》2014,9(3):315-323
This paper proposes a novel soft‐switching boost chopper with a lossless LC snubber, suitable for improving the efficiency of the electric propulsion system of vehicles. The snubber circuit is beneficial owing to the following features: zero‐current switching turn‐on and zero‐voltage switching turn‐off are achieved regardless of the operating conditions; it requires only one additional switch with smaller current rating compared to the main switch; the additional switch can be controlled by basic arithmetic; and the main switch is free from additional voltage or current stress caused by the soft‐switching operation. Along with theoretical discussions, experimental results are also presented on the circuit behavior and the resulting improvement of the energy conversion efficiency. These results show the usefulness of the chopper for improving the efficiency of electric vehicles. © 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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Usually, a snubber circuit is put in parallel with a power diode to avoid the occurrence of destructive overvoltages during turn-off. Power rectifiers that do not need a snubber are described. Using numerical simulations from the computer program COMPASS (computer program for the analysis of semiconductors), it is shown that such snubberless rectifiers can be made by controlling the axial carrier lifetime profile in the rectifier. It is possible to choose this profile in such a way that the forward characteristic of the rectifier is not impaired. The absence of a snubber circuit also leads to major electrical improvements. In the snubberless case, the total current switches more than three times faster than in the case of a normal diode with a snubber circuit, and the reverse current peak of the total current is reduced by 33%. The total dissipated power per switching process in the snubberless case is less than half the power dissipated in the normal case 相似文献