A NOVEL CHARGE AND DISCHARGE EQUALIZATION SCHEME FOR BATTERY STRINGS

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一种改善锂电池充放电的方法

串联锂电池的自放电不一致,会使电池后期容量很快降低。究其原因主要是每节电池的剩余容量不同,而剩余容量的差异就是容量的损耗。本文针对此问题,提出一种简单实用的方法,即并联充电,串联放电,来有效地解决这个问题。     

MIMO HSDPA系统中的chip级空时均衡接收方案

提出了一种频率选择性衰落环境下多输入多输出高速下行分组接入(MIMO HSDPA)系统中chip级的空时均衡接收方案, 以消除多天线和多码扩频传输时产生的严重的码间干扰和共信道间干扰; 并推导出分数采样时的空时均衡接收机以进一步提高接收机性能, 然后给出分析和接收信干噪比来设计最优权重. ITU Pedestrian A信道环境下的仿真结果验证了本文的分析和接收机优越的性能.     

铅酸蓄电池达不到设计使用寿命的原因

分析了铅酸蓄电池经常达不到设计使用寿命的原因,并针对其原因提出了改进办法.     

无人值守的小容量锂电池充放电单元设计

实时采集电池的电压和放电电量,可以了解电池的放电曲线和容量,通过反复的充放电测试,可以评价电池的好坏。无人值守的小容量锂电池充放电单元以STM32F103为主控,整合其内部A/D,利用采样电阻实现了锂电池电压和放电电量的采集,通过三极管和二极管控制电路,实现了全自动的多次充放电状态切换。最后利用上位机脚本处理数据,实现了测试数据的保存与可视化。     

In-pixel charge addition scheme applied in time-delay integration CMOS image sensors

An addition scheme applicable to time-delay integration (TDI) CMOS image sensor is proposed,which adds signals in the charge domain in the pixel array.A two-shared pixel structure adopting two-stage charge transfer is introduced,together with the rolling shutter with an undersampling readout timing.Compared with the conventional TDI addition methods,the proposed scheme can reduce the addition operations by half in the pixel array,which decreases the power consumption of addition circuits outside the pixel array.The timing arrangement and pixel structure are analyzed in detail.The simulation results show that the proposed pixel structure can achieve the charge addition with negligible nonlinearity,therefore the power consumption of the periphery addition circuits can be reduced by half theoretically.     

汽车双组电瓶充放电自动转换控制器设计

商用车发动机起动功率及电气产品功能的增加,带来整车耗电量急剧增大。迫使一些车辆改用双组电瓶并联或轮流供电,由于两组电瓶并联放电使用时电瓶的性能差别会造成过多的自放电损耗,直接影响到电瓶使用寿命,双组电瓶并联充电时会导致车辆充电系统过载故障甚至损坏充电电路部件。设计该电路,能够根据电瓶电量情况自动切换给双组电瓶分别充电及控制放电,使车辆充电系统及电瓶工作在最佳状态,能够长期保持两电瓶电量充足,克服目前部分车辆采用的手动切换方式,影响电瓶使用寿命的弊端。     

汽车动力铅酸电池的充放电辅性及均衡管理技术的研究

动力电池组中单体电池间的差异使之具有不同的充放电特性，电池组在充放电循环过程中又增加了单体电池的不一致性，导致某些单体电池过充过放电现象的发生，使得整个电池组的性能及使用寿命下降。所以为了延长电池组的使用寿命，需对电池组进行均衡充放电。     

一种新型多节锂离子电池包管理系统(英文)

为多节锂离子电池包提出了一种新型的基于主从式控制的管理系统.该电池包管理系统适用于任意节锂离子电池包.整个系统由一个主控制器和一组子管理芯片组成.电池包的每节电池对应一个子管理芯片.与现有的电池管理系统不同,所提出的方案具有独特的通信方式,并能简单直接地采集电池状态信息.每个子管理芯片和与其相邻的子芯片通讯,传递电池信息并接受来自主控制器的命令.该方法能够使电池包管理芯片系统在标准的CMOS工艺平台上实现.一块基于CSMC 0.5μm 5V N阱CMOS工艺的测试芯片经过流片并测试,验证了所提出的信号通讯方式和电池包管理芯片系统能完成对多节锂离子电池包的保护与管理.     

极化强度与电荷关系的讨论

给出了极化强度与极化电荷及自由电荷的一般关系,指出了极化强度仅由极化电荷分布决定的充分条件.     

Blind channel equalization algorithm based on dual unscented Kalman filter for chaotic multi-input multi-output communication systems

To reduce channel noise,fading,and inter-user interference effectively in the chaotic communication systems with multi-user,a blind channel equalization algorithm based on dual unscented Kalman filter algorithm is proposed.Assuming that the coefficients of a multi-input multi-output (MIMO) channel can be described by an autoregressive model,two separate state-space representations are used for the signals and coefficients.Then two unscented Kalman filters are used to estimate chaotic signals and channel coefficients simultaneously.The simulation results indicate that the algorithm can effectively track the coefficients of the multi-path fading channel in chaotic MIMO communication systems at a fast convergence speed.     

锂离子电池组合技术及其应用探究

本文通过利用两块锂电池组合代替不能充电的九伏层迭电池改装实例,为降低部分电子产品使用成本及减少电池污染提供了一种参考方法。     

A novel cell search scheme for OFDM cellular systems

INTRODUCTION Owing to its inherent ability to combat the multi-path fading channel, the modulation technology of orthogonal frequency division multiplexing (OFDM) has been widely used in many high-rate data transmissions such as digital video broadcasting (DVB-T), wireless local area network (IEEE 802.11a) and broadband wireless access (IEEE 802.16e). Re-cently, it is accepted as the most promising candidate for E-UTRA downlink (3GPP TSG-RAN-1, 2006a), which is a super 3G cell…     

一种新的无线视频传输帧内刷新策略

首先分析了无线信道突发性出错和二阶Markov无线信道模型. 根据该模型和视频编码器的编码方式推导了突发性出错引起的帧内编码和帧间编码的信道失真. 然后提出了一种新的速率失真率(R-D)框架内的帧内刷新策略. 该策略一方面对无线视频传输系统的容错性能和编码效率进行了优化, 另一方面可有效阻止帧间错误传播, 减小信道失真. 在不同传输信道中的仿真结果验证了该策略在无线视频传输容错方面的性能改进.     

彩电黑电平箝位电路电容的充放电问题

用脉冲电路理论对彩色电视接收机黑电平箝位电路中电容的充放电问题作了深入分析,以甄别现今电视机原理教材对此问题的两种不同意见．     

彩电黑电平箝位电路电容的充放电问题

用脉冲电路理论对彩色电视接收机黑电平箝位电路中电容的充放电问题作了深入分析。以甄别现今电视机原理教材对此问题的两种不同意见。     

A novel method to update dynamic pricing scheme for DiffServ

1 Introduction 1 A great deal of models have been studied on the subject of Diffserv, including static and dynamic pricing schemes. In the case of dynamic pricing, the network administrators adapt the link price to the bandwidth changes; In static pricing, the price is set based on the analysis from the historical data , and it is impossible to react to the changes in the demand or traffic load of the network. However, this scheme is easier to implement. Generally, there always exists an equi…     

有线电视用户及收费档案计算机管理系统

论述建立宁德市有线电视用户及收费档案计算机管理的意义、系统的设计思路与具体的操作方法,介绍了有线电视计算机管理系统的硬件组成、软件要求和系统合成.     

轻偶偶核电荷分布的一个统一描述

应用唯象模型结合原子核的电子散射实验结果，研究了轻偶偶核的电荷分布，给出了一个能很好地统一描述轻偶偶核的电荷分布的解析模型。该模型可以很好地给出原子核^4He，^12C，^16O，^24Mg，^28Si和^32S的电荷密度分布，电荷密度分布的均方根半径及电荷形状因子。     

An iterative computation method for interpreting and extending an analytical battery model

Battery models are of great importance to develop portable computing systems, for whether the design of low power hardware architecture or the design of battery-aware scheduling policies. In this paper, we present a physically justified iterative computing method to illustrate the discharge, recovery and charge process of Li/Li-ion batteries. The discharge and recovery processes correspond well to an existing accurate analytical battery model： R-V-W＇s analytical model, and thus interpret this model algorithmically. Our method can also extend R-V-W＇s model easily to accommodate the charge process, The work will help the system designers to grasp the characteristics of R-V-W＇s battery model and also, enable to predict the battery behavior in the charge process in a uniform way as the discharge process and the recovery process. Experiments are performed to show the accuracy of the extended model by comparing the predicted charge times with those derived from the DUALFOIL simulations. Various profiles with different combinations of battery modes were tested, The experimental results show that the extended battery model preserves high accuracy in predicting the charge behavior.