改进的开关性能：快速IGBT带来新的挑战

降低动态功耗需要快速地开关功率半导体,但是,快速开关IGBT带来的新挑战,就是对关断电压峰值有特别强烈的影响。关断过程中uce-和ic测量分析说明了直流母线寄生电感和模块电感之间的相互作用。这使得在给定的应用中非常容易分析出的薄弱环节并在模拟中发现最大的潜力。     

MPLS的框架及其关键技术

ＭＰＬＳ（Ｍｕｌｔｉｐｒｏｔｏｃｏｌ ａｂｅｌ Ｓｗｉｔｃｈｉｎｇ：多协议标记交换）还是一项非常不成熟的技术,它目前正在由ＩＥＴＦ进行标准化。对ＭＰＬＳ的工过程进行了回顾,然后介绍了ＭＰＬＳ的体系结构,最后论述了ＭＰＬＳ目前急需解决的一些关键技术。     

升降压斩波电路和Cuk斩波电路的Simulink仿真对比

现代电力电子技术的基础是电力电子器件,它可以用来实现主电路中电能的变换或控制.绝缘栅双极晶闸管（IGBT）拥有GTR和MOSFET两种器件的优点,因此具有优良的特性,在中、大功率电力电子设备中应用广泛.该文借用Simulink对buck-boost变换电路和Cuk斩波电路进行了仿真,并分析两种功能一样的斩波电路在性能上的差异.     

DESIGN OF HIGH VOLTAGE POWER CONVERTER FOR TRAVELING WAVE TUBE AMPLIFIER

Traveling Wave Tubes(TWTs) are widely used in the radar and communications system as RF power amplifiers. A highly sophisticated power supply is required by TWT. In order to meet the severe requirements of Traveling Wave Tube Amplifier(TWTA), a novel two-stage topology high voltage converter for TWTA is proposed.The converter is based on Zero-Voltage Switching and Zero-Current Switching(ZVS/ZCS) resonant techniques. The high voltage converter operation principles are investigated and major features of the converter are discussed. The power switching mode of ZVS/ZCS is obtained. The experimental results show that the converter has good soft switching characteristics. Compared to the conventional hard switched Pulse Width Modulation(PWM) techniques, the high efficiency and low ripple of the converter for TWTA are realized. The efficiency of High Voltage Electronic Power Conditioners(HV-EPC) over 93.5% under the condition of 38~46 V input voltage and 260~300 W input power. The switching frequency of first-stage(preregulator) of HV-EPC is 89 k Hz and the switching frequency of second-stage(postregulator) is 44.5 k Hz. The highest output voltage of the HV-EPC is helix voltage which is about –6.8 kV. It is especially suitable for TWTA utilized in space satellite applications due to its high switching frequency and high power density.     

Design of self-bias tail transistor technique for low phase noise CMOS VCO with harmonic suppression using capacitance ground

This paper presents a low phase noise wideband CMOS VCO based on the self-bias tail transistor technique and harmonic suppression using a capacitance ground. This VCO utilizes switching capacitor arrays in which four channels are able to be selected for multi-band application. Moreover, the design of CMOS VCO makes good use of the self-bias tail transistor and capacitance ground filter technique to reduce the phase noise. The MOS varactors are used as fine tuning for wideband operating application. The fully integrated VCO provides excellent performance with high FOM −193 dBc/Hz. The bandwidth of the frequency is 1.1 GHz and the tuning range is 13.8%. The power dissipation of the core circuit is 8.28 mW under a 1.8 V supply and phase noise is measured as low as −123.6 dBc/Hz at 1 MHz offset under 8.5 GHz oscillation frequencies. This VCO was made by the TSMC 0.18 μm 1P6M CMOS standard process and the chip area is 0.75×0.69 (mm²).     

双束质子辐照降低快速晶闸管通态压降的研究

在分析晶闸管通态压降产生的机理的基础上, 从协调开关时间与通态压降关系入手提出了采用双束质子辐照晶闸管。对ＫＫ２００Ａ 半成品晶闸管进行能量３．５ＭｅＶ 和５．０ＭｅＶ 注量为２．５×１０１１ｐ／ｃｍ ２ 的单束质子辐照晶闸管所得的晶闸管的电学参数与先用５．０ＭｅＶ 后用３．５ＭｅＶ 能量注量都为２．５×１０１１ｐ／ｃｍ ２ 的双束质子辐照的晶闸管所得的电学参数进行了对比, 发现双束质子辐照不仅能有效地缩短晶闸管的开关时间, 而且在降低快速晶闸管的通态压降方面比单束质子辐照的晶闸管优越     

中子辐照对IGBT特性的影响

简要分析了ＩＧＢＴ器件的工作机理,制作了２０Ａ／１０５０Ｖ的ＩＧＢＴ芯片,给出了测试结果。对试制芯片进行了中子辐照实验,对比了辐照前后器件的关断特性。     

一种新型可扩展的多级多平面分组交换结构的图论模型与性能分析

该文提出了一种新型可扩展的多级多平面(MPMS)分组交换结构。首先建立了MPMS的图论模型,定量地描述了MPMS中相邻连通性和端口可达性,定义了MPMS的均衡顶点和竞争顶点,并证明了MPMS决定交换性能的输入端口与输出端口间的无阻塞条件。从性能参数和结构复杂度等方面与单级交叉开关做了对比分析,结果表明MPMS可以获得P倍的最大端口速率,平方倍的最大端口数,线性比例增长的结构复杂度,具有良好的可扩展性。     

Fabrication study of proton injection layer suitable for electrochromic switchable mirror glass

An electrochromic (EC) switchable mirror glass can change between a reflective state and a transparent state with voltage application. The conventional device has a multilayer of Mg₄Ni/Pd/Al/Ta₂O₅/WO₃/indium-tin oxide on a transparent substrate. A palladium thin film was used as the proton injection layer. For practical use, we attempted to reduce the amount of palladium thin film from the viewpoints of the reduction in total fabrication cost and the efficient use of resources. The thickness of the film was related to the optical switching properties of the device. Although the device with a 1-nm-thick palladium film showed a high transmittance of 63% in the transparent state, its low switching durability was not suitable for practical application.Moreover, we were able to adapt a palladium-based alloy (Pd_0.8Ag_0.2) which is a well-known hydrogen permeation membrane as the proton injection layer to reduce the amount of palladium thin film. As a result, we found that a 4-nm-thick Pd-Ag thin film has good adaptability to the EC switchable mirror.     

程序化操作在练塘站的应用与思考

介绍了程序化操作的实现条件,比较了程序化操作的各种方案.针对IEC 61850在练塘站的应用情况,提出了三种情况下程序化操作的方案:500 kV母线停复役、500 kV主变停复役和220 kV线路倒母线,并分析、切磋了相应的安全保障措施.提出了要进一步完善程序化操作方案,开展满足“大运行”、“大检修”模式下的运行需求调研和技术评估,加快制定相适应的管理规范和技术标准等建议.