通用锂离子电池充电器控制系统的设计

本文介绍一种以PIC16F877单片机为核心的智能充电器,该充电器对充电过程进行全面管理,解决了充电检测和故障诊断的关键技术,实现了智能充电。并对充电电流、电压自动检测调整,分段恒流充电,充满后自动转为恒压浮充状态,使充电过程按理想的充电曲线进行,达到既保护电池,又能使电池充满的最佳效果,并且具有故障自动报警和保护等特点。     

基于单片机控制的智能充电器

本文设计了一种针对镍镉电池的智能恒流充电器,具有结构简单、充电快速的特点,采用恒流充电的方式,对电池进行充电,有电压检测功能,转换电路由MOSFET功率开关来控制电流大小的切换,实现充满后自动转为涓流充电且报警提醒,保护电池寿命。在电路中用AT89C2051单片机来实现控制作用,从软硬件两个方面来共同实现,且整个充电过程可由单片机控制的指示灯看到。     

HCQ系列恒流充电器的研制

本文针对目前蓄电池通用充电设备存在的不足之处,提出了一个完全更新的恒流充电器研制方案,分析了其基本原理。该设计已实现了产品化。     

基于单片机的多路大功率充电器设计

本文介绍了一种基于AVR MEGA16L单片机控制的多路大功率充电器设计方案,该充电器可同时对8组24V/2.6AH的蓄电池进行充电,并摆脱了传统的充电器结构,引入单片机做主控芯片,以脉冲宽度调节的方式控制蓄电池充电时间,并从绝对温度和满充两个方面对蓄电池进行充电控制以实现充电器智能充电。     

HEV再生制动时NiMH电池快速充电策略与仿真

基于镍氢电池性能实验结果,分析了轻度HEV用镍氢电池在不同SOC情况下不同充电电流的最高温度、温差变化趋势.结合混合动力汽车镍氢电池实际工作情况和电池快速充电理论,基于马斯定律提出了适合混合动力汽车再生制动的镍氢电池恒流分阶段充电控制策略,并进行了HEV镍氢电池快速充电过程的建模与仿真.通过对比该快速充电策略、保护电压恒流充电策略和40 A恒流充电策略下的仿真结果,验证了所提出的电池分阶段恒流充电控制策略的正确性和可行性.     

4节蓄电池串联智能充电器的设计

本文针对4节蓄电池串联充电时容易出现过充或欠充现象,设计了一种带均衡功能的智能充电器,同时对充电过程中的电池电压和充电电流提出了新的检测思路;并根据锂电池的充电特性曲线设计了充电器的软件.该充电器具有均衡作用,充电效率高.     

串联超级电容组动态分段充电控制策略

针对目前的超级电容组充电策略存在过压风险和容量利用率较低的缺陷,在现有充电方法的基础上,提出一种动态分段超级电容充电控制策略,提高了超级电容容量利用率.该方法划分为恒流充电、恒压充电与浮充3个阶段,恒流充电又划分为启动阶段、恒流阶段与充电终止阶段,恒压充电根据单体电压动态确定,设计了状态机实现该方法.采用带有均压电路的串联电容组模型进行仿真实验以验证充电效果.仿真结果表明:该方法可将超级电容利用率提高9%.     

高集成度的矿灯电源管理电路

采用高集成度的芯片设计出一种新型的矿灯电源管理电路。主要通过锂电池充电芯片TP4056的恒流-恒压模式对锂电池进行充电,通过矿灯专用芯片SN3135对主辅一体式的LED进行恒流驱动,主辅灯的工作状态可以通过自动和手动两种切换功能来实现。电路具有过充、过放、温度保护和充电状态指示的功能。实验表明:该矿灯电源管理电路结构简单、性能稳定、成本低,能够满足井下使用要求。     

TL494在密封铅酸电池充电器中的应用

介绍脉宽调制器芯片TL494的内部结构、工作原理,探讨了密封铅酸电池充电器的充电方法,利用TL494设计实现了恒流恒压充电器的实际应用电路。     

电动汽车用电池智能化快速充电研究

基于电池快速充电基本原理,制定了电动汽车用电池的分段恒流充电方案.根据对分段恒流充电试验结果的分析,对其控制策略进行了调整:按容量梯度法确定分段恒流充电终止控制参数,适当减小各段恒流值下降梯度,并将电池温度设为充电安全保障控制参数.调整方案后的充电试验结果表明,这种分段恒流充电控制方法可实现动力电池的智能化快速充电,有效缩短充电时间、提高充电效率.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that