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An analysis of the dynamic avalanche mechanism of an improved FCE diode with a deep p^+ adjusting region 被引量:1
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作者 王彩琳 张磊 《Journal of Semiconductors》 EI CAS CSCD 2015年第4期61-65,共5页
An improved field charge extraction (FCE) diode with a deep p+ adjusting region at the cathode side is studied. The reverse recovery mechanism and electric field gradient are thoroughly analyzed and validated using... An improved field charge extraction (FCE) diode with a deep p+ adjusting region at the cathode side is studied. The reverse recovery mechanism and electric field gradient are thoroughly analyzed and validated using ISE simulation results. The results show that, based on the premise of ensuring the static characteristics, the improved FCE diode can clearly improve the softness and effectively suppress the peak electric field of the nnjunction at the cathode side during reverse recovery, and thus has a high dynamic avalanche capability compared with conventional FCE diodes. 展开更多
关键词 power semiconductor device FSRD SOFTNESS dynamic avalanche
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Characteristics and dynamics of the Ganqiuchi rock avalanche triggered by a paleo-earthquake in the Northern Qinling Mountains
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作者 ZHOU Ze-Hua LYU Yan +4 位作者 SU Sheng-rui LIU Shi-jie ZHAO Hui LI Peng ZHOU Yang 《Journal of Mountain Science》 SCIE CSCD 2020年第5期1143-1160,共18页
Analyzing large prehistoric rock avalanches provides significant data for evaluating the disaster posed by these relatively infrequent but destructive geological events. This paper attempts to study the characteristic... Analyzing large prehistoric rock avalanches provides significant data for evaluating the disaster posed by these relatively infrequent but destructive geological events. This paper attempts to study the characteristics and dynamics of the Ganqiuchi granitic rock avalanche, in the middle of the northern margin of Qinling Mountains, 30 km to the south of Xi’an, Shaanxi Province, China. In plane view, this rock avalanche is characterized by source area, accumulation area and dammed lake area. Based on previous studies, historical records and regional geological data, the major trigger of the Ganqiuchi rock avalanche is considered to be a strong paleo-earthquake with tremendous energy. The in situ deposit block size distributions of the intact rock mass and the debris deposits are presented and analyzed by using a simple model for estimating the number of fragmentation cycles that the blocks underwent. The results show that the primary controlling factor of the fragmentation process is the pre-existing fractures, and there is a relationship between the potential energy and the fragmentation energy: the latter is approximately 20% of the former. Based on the dynamic discrete element technique, the study proposes a four-stage model for the dynamic course of the Ganqiuchi rock avalanche:(1) failing;(2) highspeed sliding;(3) collision with obstacles;(4) decelerated sliding, which has implication for hazard assessment of the potential rock avalanches in China and other countries with similar geological setting. 展开更多
关键词 Ganqiuchi rock avalanche Deposit block size distribution FRAGMENTATION Discrete element method Rock avalanche dynamics
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Improving dynamic characteristics for IGBTs by using interleaved trench gate
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作者 吴毅帆 邓高强 +2 位作者 谭琛 梁世维 王俊 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第12期636-643,共8页
A novel trench insulated gate bipolar transistor(IGBT) with improved dynamic characteristics is proposed and investigated. The poly gate and poly emitter of the proposed IGBT are arranged alternately along the trench.... A novel trench insulated gate bipolar transistor(IGBT) with improved dynamic characteristics is proposed and investigated. The poly gate and poly emitter of the proposed IGBT are arranged alternately along the trench. A self-biased p-MOSFET is formed on the emitter side. Owing to this unique three-dimensional(3D) trench architecture, both the turnoff characteristic and the turn-on characteristic can be greatly improved. At the turn-off moment, the maximum electric field and impact ionization rate of the proposed IGBT decrease and the dynamic avalanche(DA) is suppressed. Comparing with the carrier-stored trench gate bipolar transistor(CSTBT), the turn-off loss(E_(off)) of the proposed IGBT also decreases by 31% at the same ON-state voltage. At the turn-on moment, the built-in p-MOSFET reduces the reverse displacement current(I_(G_dis)), which is conducive to lowing dI_(C)/d_(t). As a result, compared with the CSTBT with the same turn-on loss(E_(on)), at I_(C) = 20 A/cm^(2), the proposed IGBT decreases by 35% of collector surge current(I_(surge)) and 52% of dI_(C)/d_(t). 展开更多
关键词 insulated gate bipolar transistor(IGBT) dynamic avalanche(DA) dI_C/d_t
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Study on the Two-Dimensional Density Distribution for Gas Plasmas Driven by Laser Pulse 被引量:1
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作者 焦志宏 王国利 +5 位作者 周效信 吴朝辉 左言磊 曾小明 周凯南 粟敬钦 《Plasma Science and Technology》 SCIE EI CAS CSCD 2016年第12期1169-1174,共6页
We perform an experimental study of two-dimensional(2D) electron density profiles of the laser-induced plasma plumes in air by ordinarily laboratorial interferometry. The electron density distributions measured show... We perform an experimental study of two-dimensional(2D) electron density profiles of the laser-induced plasma plumes in air by ordinarily laboratorial interferometry. The electron density distributions measured show a feature of hollow core. To illustrate the feature, we present a theoretical investigation by using dynamics analysis. In the simulation, the propagation of laser pulse with the evolution of electron density is utilized to evaluate ionization of air target for the plasma-formation stage. In the plasma-expansion stage, a simple adiabatic fluid dynamics is used to calculate the evolution of plasma outward expansion. The simulations show good agreements with experimental results, and demonstrate an effective way of determining 2D density profiles of the laser-induced plasma plume in gas. 展开更多
关键词 laser breakdown gas plasmas 2D density distribution optical interferometry photoionization avalanche ionization laser propagation fluid dynamics
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