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INTELEC 06 - Twenty-Eighth International Telecommunications Energy Conference最新文献

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The Design Consideration Comparisons of Two Clamping Modes Over Current Protection for LLC Converter LLC变换器两种箝位方式过流保护的设计考虑比较
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251614
Chen Zhao, Xiaogao Xie, Xinke Wu, Junming Zhang, Z. Qian
The over current protection is a difficult issue for LLC resonant converter design due to its variable frequency operation mode. Using clamping mode to achieve the over current protection can reduce the frequency range for design. However, clamping modes also have some drawbacks and some of them should be taken into account especially during the design processes. This paper focuses on the design consideration comparisons of two typical over current protections by using clamping mode for LLC resonant converter. Finally, an 110 V/10 A prototype is built up to verify the theoretic comparison results
由于有限责任公司谐振变换器的工作方式是变频的,过流保护是其设计中的一个难题。采用箝位方式实现过流保护,减小了设计的频率范围。然而,夹紧方式也有一些缺点,特别是在设计过程中应该考虑到这些缺点。本文着重对LLC谐振变换器中两种典型箝位过流保护的设计考虑进行了比较。最后,搭建了一个110v / 10a的样机,验证了理论比较结果
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引用次数: 13
Applied Digital Control for Localization of the Maximum Power of Photovoltaic Generators 应用数字控制实现光伏发电机组最大功率定位
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251661
Petronio Junior, Pedro G. Palheta, Denis B. Da Silva, Miguel Do Nascimento, Alex Costa, Pedro Ferreira Filho, Jose Siqueira
This paper describe the development of a digital control applied in energy generation using photovoltaic cells in joint with the other generator system (a diesel generator, for example) the technique consist in the localization of the maximum power point (pick power tracking) of photovoltaic cells utilizing digital control. Its application is attractive to isolated load system, such as isolated communication system and data transmission located in remote Amazon areas
本文描述了一种应用于光伏电池与其他发电系统(如柴油发电机)联合发电的数字控制技术的发展,该技术包括利用数字控制光伏电池最大功率点的定位(pick power tracking)。它的应用对隔离负载系统,如位于亚马逊偏远地区的隔离通信系统和数据传输具有吸引力
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引用次数: 2
An Enhanced Dynamic Battery Model of Lead-Acid Batteries Using Manufacturers' Data 基于制造商数据的改进铅酸电池动态模型
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251630
N. Medora, A. Kusko
Modeling and simulation of lead acid batteries is of utmost importance for transportation systems such as hybrid and electric vehicles, golf carts, electric scooters, and wheelchairs; and for battery backup systems such as UPS for computers and telecommunication systems. Considerable effort is put into the selection of the appropriate battery with specific regard to the battery's state of charge (SOC) and battery reserve time during the discharge profile for the various loading conditions expected. The new enhanced model has increased accuracy; it includes voltage, current, and power monitoring functions and further permits modeling of the cycle-by-cycle charge/discharge characteristics which is imperative for regenerative applications. Furthermore, the operating features of this enhanced battery model are demonstrated for two regenerative simulations. The new battery model is interfaced to a full-bridge, bi-directional, PWM controller with bi-polar voltage switching. The load is a DC motor model with motor parameters such as load torque, viscous torque and inertia. The power converter/DC motor system presents bidirectional power flow to the battery model. The purpose of the first simulation is to demonstrate real-world operation of the battery model including regeneration. A second simulation has an ultra-capacitor bank connected across the battery terminals to compare the battery model charge/discharge parameters such as voltage, current and power when the ultra-capacitor bank is absent and when present in the system
铅酸电池的建模和仿真对于混合动力和电动汽车、高尔夫球车、电动滑板车和轮椅等交通系统至关重要;以及用于计算机和电信系统的UPS等电池备用系统。在选择合适的电池方面,我们付出了相当大的努力,具体考虑到电池的充电状态(SOC)和电池在预期的各种负载条件下的放电时间。新的增强模型提高了准确性;它包括电压、电流和功率监测功能,并进一步允许对循环充电/放电特性进行建模,这对于再生应用是必不可少的。此外,通过两次再生仿真验证了该增强电池模型的工作特性。新电池模型与具有双极电压开关的全桥双向PWM控制器相连。负载为直流电动机模型,具有负载转矩、粘性转矩和惯性等电机参数。电源变换器/直流电机系统向电池模型提供双向功率流。第一个模拟的目的是演示包括再生在内的电池模型的实际操作。第二个模拟具有跨电池端子连接的超级电容器组,以比较当超级电容器组不存在和在系统中存在时电池模型充电/放电参数,如电压、电流和功率
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引用次数: 41
Improving HomePlug Power Line Communications with LDPC Coded OFDM 用LDPC编码OFDM改进HomePlug电力线通信
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251659
C. Hsu, Neng Wang, W. Chan, P. Jain
Power line communications (PLC) has received much attention due to the wide connectivity and availability of power lines. Effective PLC must overcome the harsh and noisy environments inherent in PLC channels. HomePlug 1.0 is the current PLC standard in North America. The physical layer of HomePlug 1.0 employs orthogonal frequency division multiplexing (OFDM) as well as concatenated Reed-Solomon and convolutional coding. Aiming to obtain higher PLC throughput, we investigate the performance of OFDM with low-density parity-check (LDPC) codes and compare the proposed scheme with HomePlug 1.0 ROBO mode. In our simulations, the PLC channel is modeled by multipath fading, with Middleton's Class A noise (AWCN) model simulating the worst-case impulsive noise. We apply clipping to lessen the impact of impulsive noise. A simple but effective method is devised to estimate the variance of the clipped noise for LDPC decoding. In comparison with ROBO mode, the proposed scheme offers improved performance and lower computational complexity per decoded bit. Our scheme provides increased throughput by dispensing with ROBO mode's repetitive transmission of information to gain time diversity
由于电力线的广泛连接和可用性,电力线通信(PLC)受到了广泛的关注。有效的PLC必须克服PLC信道固有的恶劣和噪声环境。HomePlug 1.0是目前北美的PLC标准。HomePlug 1.0的物理层采用正交频分复用(OFDM)以及串联里德-所罗门编码和卷积编码。为了获得更高的PLC吞吐量,我们研究了具有低密度奇偶校验(LDPC)码的OFDM的性能,并将该方案与HomePlug 1.0 ROBO模式进行了比较。在我们的仿真中,PLC信道采用多径衰落建模,米德尔顿的A类噪声(AWCN)模型模拟最坏情况下的脉冲噪声。我们采用了削波来减少脉冲噪声的影响。提出了一种简单有效的LDPC译码噪声裁剪方差估计方法。与ROBO模式相比,该方案具有更高的性能和更低的每解码比特的计算复杂度。我们的方案通过取消ROBO模式的重复信息传输来获得时间分集,从而提高了吞吐量
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引用次数: 7
Different Frequency Instabilities of Averaged Current Controlled Boost PFC AC-DC Regulators 平均电流控制升压PFC交流-直流稳压器的不同频率不稳定性
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251670
M. Orabi, A. El Aroudi
In this paper we use a new discrete time model of a boost power factor correction (PFC) AC-DC circuit under fixed frequency average current control to obtain dynamical behaviors of the system at different scales of frequency. This system is characterized by two different forcing periods and thus by two different scales of time. Four different kinds of standard instability phenomena are possible depending on the parameters of the circuit. All these instabilities are detectable by using the obtained nonlinear discrete time models. A combination of more than one instability phenomenon is also possible. We put in evidence most of the nonlinear phenomena that could occur in the system by using the switched circuit-based model and we give a unified discrete time model that is able to predict accurately these phenomena. This model is presented to study the stability of the system at different scales of time
本文采用一种新的固定频率平均电流控制下升压功率因数校正(PFC)交直流电路的离散时间模型,得到了系统在不同频率尺度下的动态特性。这个系统的特点是两个不同的强迫期,因而也有两个不同的时间尺度。根据电路的参数不同,可能出现四种不同的标准不稳定现象。利用得到的非线性离散时间模型可以检测到所有这些不稳定性。多种不稳定现象的结合也是可能的。我们用基于开关电路的模型来证明系统中可能出现的大多数非线性现象,并给出了一个能够准确预测这些现象的统一的离散时间模型。提出该模型是为了研究系统在不同时间尺度下的稳定性
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引用次数: 7
NiMH vs NiCd Batteries under High Charging Rates 镍氢电池与镍镉电池在高充电率下的对比
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251592
J. Viera, María Verónica González, J. Antón, J. Campo, F. Ferrero, M. Valledor
In last years, NiCd and NiMH technologies have settled in the market of medium/high capacity batteries. Fast-charge is very interesting in different applications (communications systems, electric vehicles, low-earth-orbit spacecrafts) in order to minimizing charge time. The problem is that high currents involved in fast-charge process affect battery behavior modifying parameters as battery charge acceptance. Moreover, battery temperature increase and gasses production related to overcharging make necessary to detect accurately the end of fast-charge to avoid battery damage. Limited information about results of charging process at different charging rates (i.e. time reduction versus charge efficiency) makes difficult to select the optimum rate in each specific application. The lack of information is more problematic in NiMH batteries due to they can not support as well as NiCd batteries extreme working conditions. For these reasons, an intensive study about NiCd and NiMH battery behavior under different charging rates was developed. In this paper, the effects of fast-charging on medium/high capacity NiCd and NiMH batteries are shown. In this way, conclusions about the application range of fast-charging in both technologies are drawn
近年来,镍镉(NiCd)和镍氢(NiMH)技术在中高容量电池市场上占有一席之地。为了最大限度地缩短充电时间,快速充电在不同的应用(通信系统、电动汽车、近地轨道航天器)中非常有趣。问题是快速充电过程中的大电流会影响电池的行为,如电池的充电接受度等。此外,电池温度升高和与过充相关的气体产生需要准确检测快充结束,以避免电池损坏。关于不同充电速率下充电过程结果的有限信息(即时间减少与充电效率)使得在每个特定应用中选择最佳充电速率变得困难。由于镍氢电池不能像镍镉电池那样支持极端的工作条件,信息的缺乏在镍氢电池中更成问题。因此,对镍镉电池和镍氢电池在不同充电速率下的性能进行了深入的研究。本文介绍了快速充电对中/高容量镍镉电池和镍氢电池的影响。从而得出快速充电在两种技术中的应用范围
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引用次数: 20
The Telecommunications Act of 1996 - Analysis a Decade Later. The Rise and Fall of Universal Solutions, Inc. 1996年电信法——十年后的分析。通用解决方案公司的兴衰
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251603
M. R. Moore
The Telecommunications Act of 1996 ("The '96 Telco Act") opened the door to companies like Universal Solutions, Inc. (USI) to provide engineering, furnishing and installation services (EF&I) to the telecommunications industry. The '96 Telco Act triggered significant speculation by venture capitalists to profit from the entry of competition for the Regional Bell Operating Companies (RBOCs). In addition, The '96 Telco Act facilitated spending by start-ups to provide telecommunications services by co-locating with the RBOCs. The '96 Telco Act forced RBOCs to lease their private facilities to co-location customers below cost. USI supported Competitive Local Exchange Carriers (CLEC). When The '96 Telco Act was passed, the industry witnessed the rise of RBOCs, and Universal Solutions was in the enviable position to support all of them. Shortly thereafter, USI landed contracts with all the major CLECs and then the all of RBOCs [end-users]. The '96 Telco Act moved RBOCs - which enjoyed operating as a local region monopoly to compete with cable companies, co-location customers and other RBOCs nationwide. The competition resulted in mass consolidation of telecommunication providers and the number of RBOCs quickly shrunk from eight to four
1996年的电信法案(“1996电信法案”)为通用解决方案公司(USI)这样的公司打开了大门,为电信行业提供工程、装修和安装服务(EF&I)。1996年的《电信法案》引发了风险资本家的重大投机,以从地区贝尔运营公司(rboc)的竞争中获利。此外,1996年的《电信法案》促进了初创企业与中央银行在同一地点提供电信服务的支出。1996年的《电信法案》迫使银行以低于成本的价格将私人设施出租给客户。USI支持竞争性本地交换运营商(CLEC)。当1996年《电信法案》通过时,该行业见证了rboc的兴起,而Universal Solutions处于令人羡慕的位置,可以支持所有rboc。此后不久,USI与所有主要的clc和rboc(最终用户)签订了合同。1996年的《电信法案》(Telco Act)推动了区域银行(rboc)与有线电视公司、托管客户和其他全国范围内的区域银行竞争。这种竞争导致了电信运营商的大规模整合,银行的数量迅速从8家减少到4家
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引用次数: 1
The Wave of the Future in High Density PC Converters 高密度PC转换器的未来浪潮
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251583
A. Elbanhawy
Recent advances in packaging and silicon design allow the design engineer to implement DC-DC converter designs breaking the current records in power density (Watt/in2) and current density (Amp/in2). We will discuss in details a recent design that boasts 400 Watt/in2 on standard 6-8 layer boards. This approach allows the design engineer to fully optimize both the electrical and PCB design as all the parasitic inductances and resistances are almost fully eliminated allowing high frequency high efficiency performance
封装和硅设计的最新进展使设计工程师能够实现打破功率密度(瓦特/in2)和电流密度(安培/in2)的当前记录的DC-DC转换器设计。我们将详细讨论最近在标准6-8层板上拥有400瓦/in2的设计。这种方法使设计工程师能够充分优化电气和PCB设计,因为几乎完全消除了所有寄生电感和电阻,从而实现高频高效率性能
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引用次数: 0
Operational Vibration Test- An Alternative to NEBS Seismic Test for Telecom Power Equipment 运行振动试验-电信电力设备的NEBS地震试验的替代方案
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251643
B. Serban
Power systems for telecommunications are required to function at high level of reliability in harsh environmental conditions of vibrations, shocks and earthquakes. The main objective of this paper is to discuss the Operational Vibration Test as an alternative to the NEBS seismic test of power equipment at shelf level. The paper discusses the rationale for an alternative to NEBS seismic test, the theoretical background, and presents a case study of power equipment shelf and distribution. Finally, the paper shows that the alternative test is more cost effective than a full seismic test and could be used for power equipment design in a timely manner
电信电力系统需要在振动、冲击和地震等恶劣环境条件下以高可靠性运行。本文的主要目的是讨论运行振动试验作为NEBS地震试验在货架水平电力设备的替代方案。本文讨论了替代NEBS地震试验的基本原理、理论背景,并以电力设备架架和配电为例进行了分析。最后,本文表明替代试验比完整的地震试验更具成本效益,可以及时用于电力设备的设计
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引用次数: 3
Return-on-Investment (ROI) for Electronic Prognostics in High Reliability Telecom Applications 高可靠性电信应用中电子预测的投资回报率(ROI)
Pub Date : 2006-12-04 DOI: 10.1109/INTLEC.2006.251619
S. Wood, D. Goodman
This paper defines the approach and methodology for the deployment of prognostics in telecom power supplies. With 100% up-time being the ultimate target, prognostics can be effectively utilized to provoke early actions to avoid costly potential down-time events. An example will be provided using a common telecom power supply. Further analysis will be provided to demonstrate the return-on-investment that prognostics adoption can achieve
本文定义了在电信电源中部署预测的方法和方法。由于100%的正常运行时间是最终目标,因此可以有效地利用预测来引发早期行动,以避免代价高昂的潜在停机事件。将提供一个使用通用电信电源的示例。将提供进一步的分析,以证明采用预测可以实现的投资回报
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引用次数: 23
期刊
INTELEC 06 - Twenty-Eighth International Telecommunications Energy Conference
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