Use Single－chip Computer to Realize Automatic Compensation for Optical Fiber Sensors

ＵｓｅＳｉｎｇｌｅ－ｃｈｉｐＣｏｍｐｕｔｅｒｔｏＲｅａｌｉｚｅＡｕｔｏｍａｔｉｃＣｏｍｐｅｎｓａｔｉｏｎｆｏｒＯｐｔｉｃａｌＦｉｂｅｒＳｅｎｓｏｒｓ①ＷＡＮＧＳｈｏｕｙｕ，ＴＩＡＮＧｕａｎｇｙｕｎ，ＹＩＮＧｕｉｌｉａｎｇ（ＹａｎｓｈａｎＵｎｉｖｅｒｓ...     

Microstructural Study of Zinc Sulfide Thin Films

ＭｉｃｒｏｓｔｒｕｃｔｕｒａｌＳｔｕｄｙｏｆＺｉｎｃＳｕｌｆｉｄｅＴｈｉｎＦｉｌｍｓ①②ＣＨＥＮＭｏｕｚｈｉ，ＬＩＵＺｈａｏｈｏｎｇ，ＷＡＮＧＹｕｊｉａｎｇＷＡＮＧＨｕｉ，ＤＥＮＧＣｈｏｎｇｈｕｉ（ＸｉａｍｅｎＵｎｉｖｅｒｓｉｔｙ，Ｘｉａｍｅｎ３６１...     

INDEX TO VOLUME 24(2002)

ＳｕｂｊｅｃｔＭａｔｔｅｒ ＡｕｔｈｏｒＮｏ .Ｐａｇｅ▲ＳＵＲＶＥＹ＆ＲＥＶＩＥＷ▲ＮｅｗＴｙｐｅｓｏｆＴｈｅｒｍａｌＩｎｆｒａｒｅｄＣａｍｏｕｆｌａｇｅＳｙｓｔｅｍ ＬＩＸｉａｏ ｘｉａ ,ＺＨＡＮＧＳｈｅｎｇ ｈｕ ,ＬＩＮＧＹｏｎｇ ｓｈｕｎ ,ｅｔａｌ.14 2ＩｎｔｅｌｌｉｇｅｎｔＩＲＩｍａｇｉｎｇＨｏｍｉｎｇＧｕｉｄａｎｃｅＴｅｃｈｎｉｑｕｅｔｏｗａｒｄＮｅｗＣｅｎｔｕｒｙＬＩＵＹｏｎｇ ｃｈａｎｇ ,ＷＵＰｅｎｇ ,ＺＨＡＮＧＬｉ 2 1ＳｏｍｅＡｎａｌｙｓｉｓｏｎＩＲＳｔａｒｒｉｎｇＩｍａｇｉｎｇｉｎ 3…     

Photoconductivity Characteristics of Porous Si

ＰｈｏｔｏｃｏｎｄｕｃｔｉｖｉｔｙＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＰｏｒｏｕｓＳｉ①ＣＨＡＯＺｈａｎｙｕｎ，ＷＡＮＧＫａｉｙｕａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＥｌｅｃｔｒｏｎｉｃＥｎｇｉｎｅｒｉｎｇ，ＳｏｕｔｈｅａｓｔＵｎｉｖｅｒｓｉｔｙ，Ｎａｎｊｉ...     

Linear Phase FIR Filter on Measuring 3-D Surface

ＬｉｎｅａｒＰｈａｓｅＦＩＲＦｉｌｔｅｒｏｎＭｅａｓｕｒｉｎｇ３－ＤＳｕｒｆａｃｅ①ＷＡＮＧＹｕｎｓｈａｎ，ＹＡＮＧＦｕｊｕｎ，ＬＩＷｅｉ（ＳｈａｎｄｏｎｇＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ，Ｊｉｎａｎ２５００６１，ＣＨＮ）Ａｂｓｔｒａｃｔ...     

Linear Polarization Components of Scattered 90°

ＬｉｎｅａｒＰｏｌａｒｉｚａｔｉｏｎＣｏｍｐｏｎｅｎｔｓｏｆＳｃａｔｅｒｅｄ９０°①ＣＨＥＮＹＲ，ＷＡＮＧＪＷ（Ｄｅｐｔ．ｏｆＯｐｔｉｃａｌＥｎｇ．，ＮａｎｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙ，Ｎａｎｊｉｎｇ２１０...     

Analytical Model for Calculating Trapped Charge in a－Si：H and Its Relative Error Analysis

ＡｎａｌｙｔｉｃａｌＭｏｄｅｌｆｏｒＣａｌｃｕｌａｔｉｎｇＴｒａｐｐｅｄＣｈａｒｇｅｉｎａ－Ｓｉ：ＨａｎｄＩｔｓＲｅｌａｔｉｖｅＥｒｒｏｒＡｎａｌｙｓｉｓＷＡＮＸｉｎｈｅｎｇ；ＸＵＺｈｏｎｇｙａｎｇ；ＺＯＵＸｕｅｃｈｅｎｇ（ＨｕａｎｚｈｏｎｇＵｎｉｖ...     

Implant Compositional Disordering on InGaAs／InP MQW Structures

ＩｍｐｌａｎｔＣｏｍｐｏｓｉｔｉｏｎａｌＤｉｓｏｒｄｅｒｉｎｇｏｎＩｎＧａＡｓ／ＩｎＰＭＱＷＳｔｒｕｃｔｕｒｅｓ￥ＺＨＡＯＪｉｅ；ＬＩＵＢａｏｊｕｎ；ＷＡＮＧＹｕｆａｎｇ；ＷＡＮＧＹｕｏｎｇｃｈｅｎ；ＴｈｏｍｐｓｏｎＤＡ（ＴｉａｎｊｉｎＮｏｒｍａｌＵ...     

Diffusion of Zinc in In_xGa_(1-x)As, InP and GaAs

ＤｉｆｆｕｓｉｏｎｏｆＺｉｎｃｉｎＩｎ_ｘＧａ_（１－ｘ）Ａｓ，ＩｎＰａｎｄＧａＡｓ￥ＺＨＵＡＮＧＷａｎｒｕ；ＺＯＵＺｈｅｎｇｚｈｏｎｇ；ＷＡＮＧＦｅｎｇ；ＳＵＮＦｕｒｏｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＳｅｍｉｃｏｎｄｕｃｔｏｒｓ，ＡｃａｄｅｍｉａＳｉｎｉ...     

Enhancement of Crystalline Quality of Strained InAs／InP Quantum Well Structures by Rapid Thermal Annealing

ＥｎｈａｎｃｅｍｅｎｔｏｆＣｒｙｓｔａｌｌｉｎｅＱｕａｌｉｔｙｏｆＳｔｒａｉｎｅｄＩｎＡｓ／ＩｎＰＱｕａｎｔｕｍＷｅｌｌＳｔｒｕｃｔｕｒｅｓｂｙＲａｐｉｄＴｈｅｒｍａｌＡｎｎｅａｌｉｎｇＸＩＮＧＱＪ；ＺＨＡＮＧＢ；ＷＡＮＧＳＭ（ＢｅｉｊｉｎｇＵｎｉｖ...     

Dynamic Current Sharing in Paralleling Power MOSFET

By combining the theory with the practice,the dynamic current shar-ing in paralleling power MOSFET is analysed.The principles of choosing parameters in-fluencing dynamic current sharing are described,and some experiment results are given on the basis of these steps.     

并联Buck变换器的均流控制技术

在并联多相DC/DC变换器中,各模块承受的电流应自动平衡。DC/DC变换器的并联均流是需要解决的关键问题。文中采用基于主从控制的并联Buck变换器为研究对象,通过仿真验证了均流控制技术能使电路具有良好的动态响应。考虑到实际应用中电路开关管会因长期工作在温度较高的情况下而降低使用寿命,采用加入温度控制的均流控制技术,从而达到了温度控制的效果。     

Multiphase voltage-mode hysteretic controlled DC-DC converter with novel current sharing

Today's on-board high-density, low-output-voltage, high-output-current, fast transient point-of-load (POL) dc-dc converters design requirements for the new generation of integrated circuits, digital signal processors, and microprocessors are increasingly becoming stricter than ever. This is due to the demand for high dynamic performance dc-dc conversion with tight dynamic tolerances for supply voltages coupled with very high power density. In this paper, a multiphase voltage-mode hysteretic controlled POL dc-dc converter with new current sharing is presented. Theoretical analysis is provided for multiphase and interleaved dc-dc converters with new current sharing method. The simulation and experimental results are compared based on a specific design example.     

一种多相DC-DC数字控制器的设计

分析了多相DC-DC变换器的均流环路小信号动态特性以及极限环振荡条件,提出一种基于平均电流的数字均流技术,并据此实现了一种多相DC-DC数字控制器。采用基于同步设计的均流控制电路和数字脉宽调制器实现电流均衡和相位交错。该多相DC-DC数字控制器芯片基于0.18μm CMOS工艺设计。仿真结果表明,在10~20 A阶跃负载电流下,输出过冲/下冲电压在20 mV以内,开关频率在0.5 MHz~2 MHz范围内可调整,均流误差从20.8%减小到5%以下。     

A new technique for parallel connection of commutation cells:analysis, design, and experimentation

A new technique useful for the parallel connection of commutation cells is introduced in this paper. It consists of using small inductances in order to ensure dynamic and static sharing of the commutated current among the different switches. The operating principle, theoretical analysis and design procedure are presented. Experimental results, obtained from a 400-W buck power converter prototype using two commutation cells, have been used to validate the theoretical analysis and demonstrate the effectiveness of the proposed technique. Several experiments have been also accomplished to clear up the advantages of this new technique in comparison to the conventional one. Results from a three-cell buck DC-DC power converter delivering 4.5 kW are also presented, revealing a balanced current sharing among cells and an excellent dynamic behavior, as foreseen in the theoretical analysis     

IGBT并联设计参考

本文主要分析如何实现并联IGBT静态和动态过程的均流，并提出了一些用于减少电流不平衡的相关并联方法，以便于客户并联设计。重点突出一些荔实现并联方案的IGBT模块新封装，叉提出一些实现并联均流的均衡措施。用相关的试验证实一些分析结论。     

Sensorless Current Sharing Analysis and Scheme For Multiphase Converters

Current sharing control in multiphase converters is essential for stable and safe operation under variable conditions or applications. It is usually used to maintain equal or desired current sharing between converter phases. In conventional current sharing schemes, this requires the sensing and processing of each phase current through a current sharing/balancing controller, which adds complexity, size and cost to the converter design. In most cases, conventional schemes are usually based on achieving a preset current sharing ratio between phases (usually equal current value among different phases), assuming that the design of phases is known (or symmetric in the case of equal sharing ratio), which may not result in achieving the optimum efficiency. Moreover, the accuracy of achieving the preset current sharing ratio is sensitive to the current sensing accuracy in all phases, which requires careful and tedious calibration of sensing circuitries. Furthermore, when digital controller is used, in order to achieve equal current sharing or desired current distribution among different phases, more analog-to-digital converters (ADCs) are required to obtain digital information on equivalent phases' currents. In this paper, theoretical analysis results are presented to derive or prove a sensorless current sharing method. The analysis is further expanded to reveal the boundary conditions that result in not achieving the desired current sharing ratio. For example, it provides the conditions under which certain phases may carry negative current, resulting in overloading the other phases. The presented method is described and verified with experimental results from a proof of concept prototype based on digital controller implementation.      

动态频谱分配与频谱共享研究综述

文中针对当前无线频谱政策和无线频谱技术局限所导致的频谱整体利用率低的问题,分析了能有效提高频谱利用率的动态频谱分配和共享技术的研究现状,包括相邻和分片动态频谱分配技术,共存和覆盖式频谱共享技术,感知无线电技术,以及频谱池技术,并讨论了其未来的研究方向,尤其是感知无线电和基于OFDM的频谱池方法.     

Paralleled DSP-based soft switching-mode rectifiers with robust voltage regulation control

This paper presents the current sharing and robust voltage regulation controls for paralleled digital signal processor-based soft switching-mode rectifiers (SSMRs). First, the design and implementation of single-module SSMRs are made. In dealing with the current control loop design of each SSMR module, the small-signal model is derived and used to design the current-controlled pulse-width modulation (PWM) scheme. As to the common voltage control loop, its dynamic model is estimated from measurements. Then, a quantitative design procedure is developed to find the parameters of the voltage controller according to the prescribed control specifications. As the changes of parallel number and operating condition occur, the robust control is added to reduce the voltage regulation control performance degradation. The proposed multimodule operation control scheme consists of a master controller and N slave controllers. The former further consists of a common voltage controller and a current distribution unit, and the latter are the current-controlled PWM schemes of all SSMRs. Each slave controller receives the weighted sinusoidal current command from the master controller and regulates the feedback current of SSMR. The results confirm that the designed parallel SSMR system possesses good line drawn current power quality, module current sharing and voltage regulation control performances.     

主从控制模式下并联Buck变换器的均流技术研究

文中建立了主从均流控制下的并联Buck变换器的数学模型.从动态特性上来说,保留了主变换器的原有设计特性,从变换器强制改变原有的特性,跟随主变换器电流.同时还研究了基于UC3842模块下的主从控制均流现象,并分析两者的特性.