A multi coding technique to reduce transition activity in VLSI circuits

Advances in VLSI technology have enabled the implementation of complex digital circuits in a single chip, reducing system size and power consumption. In deep submicron low power CMOS VLSI design, the main cause of energy dissipation is charging and discharging of internal node capacitances due to transition activity. Transition activity is one of the major factors that also affect the dynamic power dissipation. This paper proposes power reduction analyzed through algorithm and logic circuit levels. In algorithm level the key aspect of reducing power dissipation is by minimizing transition activity and is achieved by introducing a data coding technique. So a novel multi coding technique is introduced to improve the efficiency of transition activity up to 52.3% on the bus lines, which will automatically reduce the dynamic power dissipation. In addition, 1 bit full adders are introduced in the Hamming distance estimator block, which reduces the device count. This coding method is implemented using Verilog HDL. The overall performance is analyzed by using Modelsim and Xilinx Tools. In total 38.2% power saving capability is achieved compared to other existing methods.     

加强分布式电源入网对配网电压质量管理的措施

随着经济的发展,分布式电源入网用户数量规模也随之增多,分布式电源入网对配网电压质量的影响也越来越大。本文分析了分布式电源入网对配网电压质量的影响。     

Transient power supply current monitoring—A new test method for CMOS VLSI circuits

We present a new method for testing digital CMOS integrated circuits. The new method is based on the following premise: monitor the switching behavior of a circuit as opposed to the output logic state. We use the transient power supply current as a window of observability into the circuit switching behavior. A method for isolating normal switching transients from those which result from defects is introduced. The feasibility of this new testing approach is investigated by conducting several experiments involving the design of integrated circuits with built-in defects, fabrication, and physical testing. The results of these experiments show this new test method to be a promising one for detecting defects that can escape stuck-at testing andI _DDQ testing.     

区域配网规划和改造对提高供电可靠性研究

配电网供电可靠性是当下社会范围内共同关注的焦点话题,而供电可靠性容易受到硬件与软件层面相关因素的影响而有所下滑,导致供电效率和稳定性大受影响,严重时甚至可能引发安全事故。为了提高供电可靠性,可以从区域配网规划和改造入手,针对区域配网现状进行分析,研究其对供电可靠性的影响,再根据分析结果针对性地执行区域配网规划改造方案,能够显著提升供电可靠性。     

基于联合法的配电网供电能力可靠性评估研究

分布式电源功率输出的随机性和间歇性及其并入电网的位置,会影响配网供电能力的可靠性.文中对此展开研究,首先建立了分布式电源、风电以及光伏发电三种数学模型,同时研究了负荷和系统可靠性指标概率分布特征,然后提出了一种将网络等值与拟蒙特卡罗联合法用于配电系统可靠性的定量评估,最后结合改进的IEEE-RBTS Bus6的F4馈线...     

分布式电源并网对配电网电能质量的影响研究

分布式电源在配电网的并网规模越来越大,但分布式电源出力具有典型的随机特征和不确定性,分布式电源的并网会对配电网电能质量带来很大的影响。基于分布式电源的输出功率特性,文中分析了分布式电源并网对配电网电能质量影响的原理,并建立了含分布式电源的配电网电能质量的仿真计算模型,对分布式电源在不同并网容量和不同并网位置下的配电网电压偏差、电压波动和电压谐波含量进行了仿真分析,获得了分布式电源并网对配电网电能质量的影响规律。文中研究成果可为分布式电源的并网及配电网电能质量的提高,提供有效的理论参考和技术指导。     

分析分布式电源入网对系统配网电压质量的影响

分布式电源作为一种清洁、可靠的电源已逐渐推广使用。本文将讨论研究分布式电源入网对系统配网质量的影响。     

Quantifying the effect of local interconnects on on-chip power distribution

Existing methods to analyze and optimize on-chip power distribution networks typically focus only on global power network modeled as a two-dimensional mesh. In practice, current is supplied to switching transistors through a local power network at the lower metal layers. The local power network is connected to a global network through a stack of vias. The effect of these vias and the resistance of the local power network are typically ignored when optimizing a power network and placing decoupling capacitors. By modeling the power distribution network as a three-dimensional mesh, the error due to ignoring via and local interconnect resistances is quantified. It is demonstrated that ignoring the local power network and vias can both underestimate (by up to 45%) or overestimate (by up to 50%) the effective resistance of a power distribution network. The error depends upon multiple parameters such as the width of local and global power lines and via resistance. A design space is also generated to indicate the valid width of local and global power lines where the target resistance is satisfied. It is shown that a wider global network can be used to obtain a narrower local network, providing additional flexibility in the physical design process since routability is an important concern at lower metal layers. At high via resistances, however, this approach causes significant increase in the width of a global power network, indicating the growing significance of local power network and vias.     

电力自动化系统在配电网运行管理中的应用

为了满足各种用户的需求,将最小的电能浪费以满足所有用户的利益,实现电能的充分利用,电网中已经逐渐掺入了自动化元素的应用,这给我国电网的性能、监控、控制、维护上带来了极大的便利,目前我国在电网自动化上正在大力研究开发中,已经取得了相应进步。     

基于智能电网的一体化信息通信网络发展研究

信息通信融合的大趋势下,当前的电力通信网络存在诸多问题,面临转型压力.通过研究智能电网业务发展模式、电力信息通信网技术体制、网络架构以及转网实现策略,提出构建“综合接入、一体传送、网络扁平、业务贯通”的新型智能电网信息通信网架结构.     

大功率设备在电网波动下的研究对策

针对电网短暂波动或短时断电导致交流接触器脱扣的问题。设计一种在检测交流侧电压不正常情况下控制继电器切换到储能器件,避免交流接触器在电网波动情况的不正常工作的控制器;从而达到当电网波动出现时交流接触器维持吸合状态,实现在控制延迟的时间后断开。结果表明采用防电网波动控制器,能够有效解决交流接触器脱扣的问题,从而有效的避免电网波动事故的发生,使整个系统能够连续安全、可靠的运行。     

医院手术室配电系统的设计

随着经济和科技水平的提高,我国的医疗条件也在不断的进步.当前,人们对健康的重视程度也不断提高,医疗条件也需要更进一步的改善,为患者提供高水平的医疗服务.医院手术室的环境是非常重要的,本文将探究医院手术室配电系统的设计.     

A survey of power estimation techniques in VLSI circuits

With the advent of portable and high-density microelectronic devices, the power dissipation of very large scale integrated (VLSI) circuits is becoming a critical concern. Accurate and efficient power estimation during the design phase is required in order to meet the power specifications without a costly redesign process. In this paper, we present a review of the power estimation techniques that have recently been proposed     

供配电自动化控制系统的应用

近几年随着社会经济的不断发展,人们的生活水平有了较大的提高,对电力资源的需求逐渐扩大,同时,随着科学技术的发展应用,对人们的日常生活也都提供了更为便利的操作.现在社会阶段,社会经济的繁荣发展对电力资源配置有了更高的要求,同时借助互联网信息技术对电力系统的供配电控制带来了自动化智能化的创新升级.城市供配电控制系统在城市各...     

GA—BASED MAXIMUM POWER DISSIPATION ESTIMATION OF VLSI SEQUENTIAL CIRCUITS OF ARBITRARY DELAY MODELS

In this paper,the glitching activity and process variations in the maximum power dissipation estimation of CMOS circulits are introduced.Given a circuit and the gate library,a new Genetic Algorithm (GA)-based technique is developed to determine the maximum power dissipation from a statistical point of view.The simulation on ISCAS-89 benchmarks shows that the ratio of the maximum power dissipation with glitching activity over the maximum power under zero-delay model ranges from 1.18 to 4.02.Compared with the traditional Monte Carlo-based technique,the new approach presented in this paper is more effective.     

基于网络电力仪表的智能配电系统解决方案

本文分析了基于数字远程仪表、RS-485总线和工控机的定位方案存在的不足,提出了一种新的组网方案.介绍了基于网络功率仪表的智能配电系统的组网方式和网络结构,分析了该系统的优点.     

Adaptive neuro fuzzy inference system-based power estimation method for CMOS VLSI circuits

Recent advancements in very large scale integration (VLSI) technologies have made it feasible to integrate millions of transistors on a single chip. This greatly increases the circuit complexity and hence there is a growing need for less-tedious and low-cost power estimation techniques. The proposed work employs Back-Propagation Neural Network (BPNN) and Adaptive Neuro Fuzzy Inference System (ANFIS), which are capable of estimating the power precisely for the complementary metal oxide semiconductor (CMOS) VLSI circuits, without requiring any knowledge on circuit structure and interconnections. The ANFIS to power estimation application is relatively new. Power estimation using ANFIS is carried out by creating initial FIS modes using hybrid optimisation and back-propagation (BP) techniques employing constant and linear methods. It is inferred that ANFIS with the hybrid optimisation technique employing the linear method produces better results in terms of testing error that varies from 0% to 0.86% when compared to BPNN as it takes the initial fuzzy model and tunes it by means of a hybrid technique combining gradient descent BP and mean least-squares optimisation algorithms. ANFIS is the best suited for power estimation application with a low RMSE of 0.0002075 and a high coefficient of determination (R) of 0.99961.     

分布式电源对配电网供电可靠性的影响及接入优化研究

分布式电源接入对配电网供电可靠性的影响是目前供电企业研究的主要问题,分布式电源技术在我国起步较晚,仍旧属于新型技术。在发挥着重要作用的同时,也存在一些问题。本文对分布式发电技术进行了分析,并研究了对配电网供电可靠性的影响,同时对接入优化展开了相关的研究。     

孤岛模式下辐射配电网改进潮流算法

同相逆并联结构常应用在大功率电解中,其负荷特性决定了生产成本对电费波动较为敏感,自建发电机组可以有效实现成本控制。然而同相逆并联的复杂拓扑结构应用在独立配电网时会增加电力系统的复杂性,改变电网的谐波潮流分布,使系统面临电压越线的风险。针对传统前推回推法处理辐射网潮流时出现不收敛情况,基于回路分析法,并与前推回推法进行结合,提出一种同相逆并联结构整流器孤岛模式下辐射配电网改进潮流算法。通过分解支路电流,对辐射网分裂点电流进行补偿,改变其不收敛现象,并且通过MATLAB进行数据仿真,验证了此算法的有效性和精确性。     

电力供配电系统自动化控制发展趋势

我国自动化技术水平不断提升,并逐渐应用于各个行业,自动化技术在改善人们生活、提高生产效率方面发挥显著作用.自动化控制技术与电力供配电系统实现巧妙结合,它的出现进一步优化了电力供配电系统内部结构,有效减少了人力资源成本的投入.为促进电力系统朝着智能化方向发展,文章认为明确自动化控制技术应用于电力供配电系统的价值,深入探究...