电动汽车锂电池SOC估测

SOC的估算对电动汽车锂电池的管理至关重要.该文提出了一种改进的安时积分法,在传统安时积分的基础上考虑温度对电池充放电的影响,及静置时间对SOC初值的影响,及时对SOC的初值进行修正,避免了传统安时积分法对误差的累积.以磷酸铁锂电池为例搭建实验平台,得到计算所需参数,并且验证了设计思路的可行性.     

基于GA-ELM模型的锂电池SOH预测

针对锂电池健康状态(State of Healthy,SOH)预测精度低的特点,利用遗传算法改进的极限学习机(Extreme Learning Machine,ELM)算法可提高锂电池SOH的预测精度。ELM输入层到隐含层的权值及隐含层单元的阈值随机产生,ELM算法只需设置隐含层单元的数目及隐含层激活函数类型。相比传统BP算法,ELM算法具有学习速率快、泛化性能好等优点。但由于ELM网络输入层到隐含层的权值和隐含层阈值产生的随机性,ELM算法的稳定性较差。ELM算法中引入遗传算法(GA)优化输入层到隐含层的权值和隐含层单元的阈值,该方法可增强ELM算法的稳定性。实验对比了GA-ELM算法与ELM算法、BP算法、RBF算法及SVR算法对锂电池SOH的预测,结果显示GA-ELM算法相比其他算法在预测精度和算法稳定性上均有提升。     

Information Rates Subject to State Masking

We consider the problem of rate-R, channel coding with causal/noncausal side information at the transmitter, under an additional requirement of minimizing the amount of information that can be learned from the channel output about the state sequence, which is defined in terms of the mutual information between the state sequence and the channel output sequence. A single-letter characterization is provided for the achievable region of pairs {(R, E)}. Explicit results for the Gaussian case (Costa's dirty-paper channel) are derived in full detail.     

A Design of a Grey-Predicted Li-Ion Battery Charge System

In this paper, we consider an Li-ion battery as a grey system. The grey prediction technique is then used to develop a grey-predicted Li-ion battery charge system (GP-LBCS). The proposed GP-LBCS is designed to replace the general constant-voltage (CV) mode using the GP mode to improve the Li-ion battery charge behavior. A GP algorithm is built in GP-LBCS to make the charge trajectories faster and safer. A 3-D Y-mesh diagram for describing the charge trajectories of the proposed GP-LBCS is simulated. A GP-LBCS prototype is designed and implemented to assess the charge performance. Experiments show that the charge speed and the charge efficiency of the proposed GP-LBCS, compared with the general constant-current-CV charge system, are increased above 23% and 1.6%, respectively. The charge speed and efficiency in the proposed GP mode are improved above 34% and 7%, respectively, compared with that in the general CV mode.     

Design of a Charge Equalizer Based on Battery Modularization

The charge equalizer design for a series-connected battery string is very challenging because it needs to satisfy many requirements, such as implementation possibility, equalization speed, equalization efficiency, controller simplicity, size and cost issues, voltage and current stress, and so on. Numerous algorithms and circuits were developed to meet the foregoing demands, and some interesting results have been obtained. However, for a large number of cells, for example, 80 or more batteries, the previous approaches might not easily satisfy the foregoing requirement. To overcome these difficulties, we propose a charge equalizer design method based on a battery modularization technique. In this method, a very long battery string is divided into several modules, and then, an intramodule equalizer and an outer-module equalizer are designed. This battery modularization scheme effectively reduces the number of cells that we consider in an equalizer design procedure; thus, the design of a charge equalizer becomes easier. Furthermore, by applying the previously verified charge equalizers to the intramodule and the outer module, we can make the equalizer design more flexible. Several examples and experimental results are presented to demonstrate the usefulness of the charge equalizer design method.      

锂离子电池充电：充电系统的差异与选择

简介 目前,便携式设备的供电问题向系统设计师提出了许多挑战,利用电池作为主电源的做法越来越流行,因此系统设计师必须设计出高度精密的系统,充分挖掘电池的所有潜力.每种应用都是不同的,但有一点却相同:尽可能地充分利用电池的容量,这一目标与如何恰当地为充电电池充电直接相关.     

关于密封铅酸蓄电池充放电电路的研究

文章主要介绍了一种应用于无线采集终端备用密封铅酸蓄电池的充放电保护电路,本电路采用TI公司生产的集成电路UC3906作为充电主控电路,辅以自杀式放电保护电路,防止蓄电池的过放电,从而有效地延长了蓄电池的使用寿命。     

Reliability Analysis of a System Subject to Partial and Catastrophic Failures

This note considers a system which is subject to both partial and catastrophic failures. A Markov process, continuous in time and with three discrete states is used to demonstrate the effect of the throw-away maintenance philosophy on reliability.     

过渡层和界面电荷对金属硅化物/硅肖特基接触特性的影响

针对金属硅化物／硅接触存在过渡层，提出了分析这种结构的肖特基接触特性的模型；讨论了过渡层厚度、界面电行及有关参数的影响，分析了不同退火条件下PtSi／Si肖特基二极管的特性。     

MAX1758构成锂离子电池充电控制器的设计

MAX1758是Maxim公司推出的锂离子电池充电控制集成电路芯片。它具有电池插入检测和自动低压电池充电等功能。文章分析讨论了该芯片的基本性能、工作原理、参数设置及应用设计,并对应用中出现的充电电池检测、输入电流限制、印刷电路板设计等若干技术问题进行了分析讨论,给出了相应的典型应用电路。     

镍镉或镍氢电池快速充电控制电路bq2004

bp2004快速充集成电路适用于镍铺或镍氢电池组的安全、高效快速充电控制。文中介绍了bp2004的基本性能、引脚功能、各电路的工作原理、主要参数及典型应用电路的设计。     

密封铅蓄电池阻抗参数与荷电态

蓄电池的交流阻抗特性远比理想的单电极要复杂，不同类型的蓄电池的阻抗参数差别很大，其中有些参数有可能用于指示蓄电池的荷电态。密封铅蓄电池的荷电态在50%以上时，电池内阻几乎没有变化，但其电化学反应内阻与双层电容之积，却对荷电态很敏感。     

Reliable Sliding-Mode Control for Markovian Jumping Systems Subject to Partial Actuator Degradation

In this work, a novel robust sliding-mode control (SMC) method has been provided for uncertain stochastic Markovian jumping systems subject to actuator degradation, such that the closed-loop system is globally asymptotically stable (with probability one). In the design of switching functions, a set of specified matrices are employed such that the connections among sliding surfaces corresponding to each mode are established. Then, a sliding-mode controller is synthesized to ensure the reachability of the specified switching surface despite actuator degradation and uncertainties. Finally, the simulation results illustrate the proposed method and the effectiveness.     

卫星用锂电池组旁路开关可靠性预计

旁路开关是卫星电池配套器件,连接在各电池之间,对故障电池进行切除和保护,保证整个电池组的正常工作,其可靠性将影响电池组的可靠性,要求旁路开关可靠性不低于0.9993.本文基于GJB/Z299C,采用元器件应力分析的可靠性预计法来计算开关本体的失效率,再通过失效率的指数分布,计算出旁路开关的可靠度,结果满足可靠性指标要求...     

便携系统中电池充电与系统供电并存的考虑

在大多数使用可充电电池组的便携式系统中，直流输入不仅给系统供电，还要给电池充电。因此，系统设计者必须考虑如何在用直流输入给系统供电的同时，快速、安全、可靠地给电池充电。     

退役锂动力电池SOC预测建模与分析

随着锂动力电池退役周期的到来,电池梯次应用具有现实意义。为了解决梯次再利用时退役电池放电非线性变化剧烈引起的电池荷电状态(State of Charge,SOC)预测精度不高问题,提出了一种基于量子粒子群(QPSO)优化RBF神经网络预测退役电池SOC的动态模型,相比经典的粒子群(PSO)优化算法具有更好的稳定性。实验结果表明:该预测模型的误差稳定在1%以内,响应速度快,为锂电池充分利用奠定了理论基础。     

基于MAX1873锂电充电控制器的双电源供电系统设计

目前大多数据采集系统采用220V交流电源供电，而在实时性要求高的场合则采用交流电源作为主电源并且蓄电池作为备用电源的双电源系统进行供电，以防止由于交流电源的突然断开而造成数据采集系统的数据丢失。针对220V交流电源供电系统以及交直流双电源供电系统中存在的问题和缺陷，介绍了多节锂电充电控制器MAX1873的特点和充电控制方法，以及利用MAX1873构成的锂电市电双电源供电系统的详细设计方法和设计调试中应注意的问题。     

大功率锂电池的充放电管理器控制技术研究

对锂电池CDM（充放电管理器）的原理进行了分析,研究了一种可以根据直流母线电压和电池电压情况自动进行充／放电切换的一端稳压一端限压稳流的控制策略,并通过CAN通信实现了与BMC（电池控制器）和液晶显示控制器的数据传输。最后,在10kW双向DC／DC变换器样机上实现了充放电管理控制策略和数据的实时收发,并给出了实验波形和测试数据。     

Gain Scheduled State Feedback Control for Discrete-Time-Varying Polytopic Systems Subject to Input Saturation

In this paper, we study the stability and performance optimization problem of discrete-time-varying polytopic systems with actuator saturation. First, the homogeneous polynomially parameter-dependent matrix function (HPP-DMF for abbreviation) is proposed. Then, a set invariance condition is obtained by applying the HPP-DMF to the Lyapunov function and gain scheduled control law. Based on the set invariance condition, an algorithm is proposed to minimize the worst-case performance. The conditions in the algorithm are expressed in terms of linear matrix inequalities (LMIs). In addition, it is shown that as the degree of the HPP-DMF increases the conditions become less conservative. A numerical example is presented to demonstrate the effectiveness and superiority of the proposed technique.     

高效电池电源设计研究

传统的电池电源设计存在诸多弊端:低电压供电难,供电时间短,输出电压纹波较高,消耗电流大以及开关频率高时,效率低下。笔者以TI公司的充电泵TPS60210为基础,采用推挽拓扑结构,根据负载电流的大小,自动选择三种不同的工作模式(待机,连续频率及脉冲–跳跃),实现了低EMI、高转换效率的电池电源设计,减少了常规充电泵固有的高输出电压纹波,延长了电池寿命。