汽车电源保护系统的设计 ——以多功能通信车为例

结合多功能通信车工作电源的特点及使用过程中的安全要求,在分析漏电保护器的工作原理和功能基础上,设计多功能通信车车载电源漏电保护器样品。实验表明,经过调试、运行及根据测量点电压值反馈的结果,该多功能通信车上所设计的漏电保护器,能够在漏电、过流、欠压、过压情况下做出相应指示报警,达到漏电保护、非正常工作状态显示的目的。     

DC—98C录像机常见故障原因

ＤＣ—９８Ｃ录像机常见故障原因梁志星一、接通电源后多功能显示窗不显示，开电源后没有任何反应。原因：多为电源部分保险管Ｆ８０５断路，使＋５Ｖ输出电压为零，因此造成整机不能正常工作。二、开机后多功能显示窗不显示，使用录像带时操作键均正常工作，其余操作功能...     

改旧壳式单相变压器为微型焊机

教学设备维修需要多功能微型焊机。将电源变压器改制成微型焊机 ,既经济 ,又实用     

绿色多功能材料高铁酸钾的应用研究进展

高铁酸钾是具有强氧化性和高选择性的绿色、无污染的多功能化学试剂,其在水处理、有机合成、化学电源等领域具有广泛的应用.在分析应用的基础上对其发展趋势进行了分析,并提出了今后的研究设想.     

室内安防系统的设计

文章介绍的室内安防系统,由管理中心机、联网器、层间分配器、多功能室内分机、安防探测器、声光报警器和电源等七个部分组成,对人身安全和家庭财产安全具有防范作用。     

晶闸管多功能焊机的模块化设计

介绍了一种以模块化设计为思路而研制的多功能弧焊电源,可以方便地实现PCB板的替换与维护。通过采用PWM脉宽调速送丝系统,在CO2焊时实现稳定送丝,降低了飞溅。TIG焊时的一次引弧成功率高。     

煤矿蓄电池电机车电源装置的运行与维护

结合开滦(集团)有限责任公司赵各庄矿业公司大量投入防爆特殊型蓄电池电机车的实际情况,研究了在蓄电池机车使用过程中,多功能环保电解液对蓄电池性能的影响,并提出了电源装置日常管理中应注意解决的主要问题,以便把握蓄电池管理运作的重点.     

听觉的形成演示器

一、仪器装置实验装置如图1所示。二、制作材料泡沫板、节日流水彩灯、红气球、微型振动机、小电子音乐器、粗油笔芯、多功能电源、木板、开关。三、制作方法1.将泡沫板磨制成耳和脑的剖面形状,并涂上适当的颜色。     

基于单片机PIC16F87的大功率智能充电机设计

利用马斯三定律作为理论基础,设计了一款以大功率开关电源作为充电电源,以单片机为控制核心的多功能通用型智能充电机．提出了一种三段式脉冲快速充电的新方法．该方法不仅能显著提高充电速度,还能有效实现去极化．实际使用表明该充电机充电效率高,能有效延长电池使用寿命．     

多功能PLC抗干扰措施

复杂环境中使用多功能PLC会受到来自电源、控制柜内外设备、变频器等设备多方面的干扰,易造成PLC逻辑数据混乱、信号输出误动,甚至死机等不良后果,采取1:1隔离变压器、UPS供电、吸收法、回避法等措施是增强PLC抗干扰性的主要手段.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.