共查询到20条相似文献，搜索用时 62 毫秒
1.
李鹏飞 《商情·科学教育家》2013,(17)
基于AVR单片机的智能充电系统可以对电池的充电过程进行动态、全面的监控与管理,能够自适应的检测出不同型号的电池,有效地控制电池的充电过程,对充电电源、电压进行自动检测调整,充电后自动转为恒压浮充状态,对待充电的电池进行保护,防止过电压和温度过高对电池的损坏,达到既保护电池、又能使电池充满的要求。采用智能充电方式,提高了电池的使用寿命,并且加快了电池的充电的速率,实现了智能充电目的。 相似文献
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《实验室研究与探索》2020,(7):41-44
针对锂离子电池组后备电源的均衡充电特性,选取易于采集的电池工作电压作为电池组均衡控制参数,据此设计制作了锂离子电池组均衡控制电路。设定3.4、3.5、3.6 V的3个不同均衡阈值电压分别对4只3.2 V 20 Ah磷酸铁锂电池组成的电池组进行0.1 C、0.25 C和0.5 C倍率的充电均衡测试,并记录每组电池的充电电流、电压和内阻。通过分析对比发现,同倍率的充电均衡阈值电压越大,均衡能耗越低,均衡速度越快。因此,重要场合的锂离子电池组后备电源系统宜采用大电流大阈值均衡控制方法,迅速有效地将电池组充满电,确保后备电源给设备提供稳定的电能。 相似文献
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Ni-MH电池作为一种新型充电电池,具有能量比大、重量轻、温度特性好等特点,并且与铅酸蓄电池、镍镉电池等传统电池相比,它对环境污染更小,被称为绿色电池,如今Ni-MH电池已得到广泛的应用。本设计是一个以GM6802芯片为基础的快速充电电路,通过GM6802控制外部恒定电流充电回路,检测充电电压以及充电过程中的温度,实现对1~20节的串联电池进行快速充电管理,在进行理论分析之后,搭建电路对2节电池进行电路充电实验。实验结果显示,该设计电路不但能够很好地实现镍氢电池的快速充电,而且能够精确判断镍氢电池充满状态。 相似文献
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采用线圈耦合进行能量交换设计无线手机万能充电器,通过振荡器、功率放大和初级线圈将交流电能发送出去,接收端通过次级线圈接收交流能量后,整流变为直流电能给智能充电管理芯片CT3582供电,该管理芯片具有充电指示、检测电池好坏、自动识别电池极性和充满指示的功能,经过硬件制作和调试,满足设计的要求. 相似文献
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沈宝军 《数理天地(初中版)》2004,(2)
题1 某定值电阻两端的电压由3V增大到6V时,通过该电阻的电流变化了0.3A.求该电阻的电功率变化了多少? 错解1 电阻两端的电压变化了△U=U2-U1=6V-3V=3V,通过电阻的电流变化了△I=O.3A,所以该电阻的电功率变化了△P=△U·△I=3V×O.3A=0.9W. 相似文献
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均衡充电是串联蓄电池充电过程的重要组成部分,讨论了影响阀控铅酸蓄电池性能的均衡充电问题。指出了被动均衡充电,即传统过充电方式的弊端:速度太慢,尤其当单元电池串联块数超过12块更是如此。主动均衡充电优势明显,可加快充电进程,支持故障单元电池或单体电池更换。指出了主动均衡充电能达到10m V/单元电池数量级,可延长蓄电池组使用寿命。适当设计的主动均衡充电可使串联蓄电池组寿命与单元电池寿命一致。 相似文献
7.
MH-Ni电池充放电性能和贮存性能的研究 总被引：1，自引：0，他引：1
研究了负极材料为Mm0.8La0.2Ni4.0(MnCoAl)1.0贮氢合金的MH-Ni电池的充放电性能,在0.2A电流下的充电电压和放电电压分别为1.4V和1.2V,充电效率为89.1%。电池贮存30天自放电率为22.6%,其原因为电极中氢的解吸和贮氢合金的氧化。 相似文献
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<正> 摄录像机常用的专用电池组有NP—1系列、BP—90系列等。标称电压12V,电池组容量一般有2.0、2.3、3.5、4.0、5.0Ah几种。这类电池大多应用进口快速充电器,充满后空载电压为15V左右,将充满的电池取下,放置约2小时,电压回落稳定在12.7～13V。 以NP—1B电池为例其标称电压为12V,标称容量为2.3Ah,充满电,电池电压 相似文献
9.
曾晓勇 《数理化学习(高中版)》2006,(18)
随着科技进步,越来越多的新型电池进入我们的生活,然而科技在改善生活的同时也带来了环境问题,近期CCTV—1新闻频道多次报道废旧电池的回收问题.关注科技前沿,联系生活实际,注重环保问题,是高考的一个重要方向.然而不少同学在有关电池知识方面还存在基本概念不清,书写电极反应式困难,不能进行有关计算等一些问题.现将各类考试中出现过的有关电池试题归类并作一定解析,希望对大家有一些帮助.一、银锌电池例1银锌电池广泛用做各种电子仪器的电源,它的充放电过程可表示为:2Ag+Zn(OH)2充电放电Ag2O+Zn+H2O回答下列有关问题:(1)电池在放电… 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
12.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
13.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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李晓劲 《读与写:教育教学刊》2008,5(6)
Public speaking, as one kind of speech act, the speaker uses some pragmatic strategies, for example,the use of personal pronoun, in order to achieve effective communication. Speakers use the first personal pro-noun we and the second personal pronoun you conventionally, also there are some deviations in the use of person-al pronouns. However, theses kinds of uses have to be explained and understood in such a specific context. 相似文献
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宋少华 《读与写:教育教学刊》2008,5(5):3-5
This essay mainly studies the linguistic features of News English on stylistics.The study is made mainly on three aspects of News English.They are lexical features.sentence features and grammar features of News English.Through the study we find that News English,as a distinctive and new language.has its own lin-guistic features in words, sentences and grammar. 相似文献
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正Nong Luhuan had a wild dream when he was little.He wanted to become a cartoonist and publish books of his own.Now,the 22-year-old art design major at Sichuan Fine Art Institute has achieved his dream.His micro blog cartoon has more than 260,000 followers and he will publish his first book this week.农璐焕小时候有一个疯狂的梦想,他想成 相似文献
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正The hardest arithmetic to master is that which enables us to count our blessings.世界上最难的算术题是如何清点我们的祝福。According to legend,a young man while roaming the desert came across a spring of delicious crystal-clear water.The water was so sweet,he filled his leather canteen so he could bring some back to a tribal elder who had been his 相似文献