共查询到20条相似文献,搜索用时 46 毫秒
1.
《洛阳师范学院学报》2016,(11)
本文以STC12C5A60S2单片机为主控制器,设计了一种带漏电保护功能的线性直流稳压电源.电源主电路利用TL431产生2.5V基准源,将输出电压反馈过来和基准源比较,控制TIP127三极管导通,实现稳压输出.单片机首先利用10位内置ADC对输出电压、电流信号采集,然后完成相应的保护功能,最后将各参数送LCD显示.测试结果表明,该电源工作可靠、性能良好、稳定电压稳定,且输出电流可大于1A,电压调整率、负载调整率均在理想的范围之内. 相似文献
2.
3.
蔡顺燕 《四川教育学院学报》2014,(11):110-113
设计了一种输入电压为5.5V~25V,输出电压为5V的直流稳压电源及其漏电保护装置系统.直流稳压电源模块采用达林顿管TIP42、OP07运算放大器及三极管构成一个深度负反馈稳压电路.输出电压经ADS1286转换为数字量后送入单片机采样输出电压,经霍尔电流传感器CSM002A、跟随器OP07后,送入ADS1286,转换为数字量后送入单片机采样负载电流.由软件程序计算功率,并在液晶上显示.通过采样负载电流与总电流的差值实现漏电检测,并进行漏电保护.经测试,系统电压调整率Su≤1%,负载调整率SL≤1%,5.5V ~ 25V输入,输出为5±0.05V. 相似文献
4.
为了智能测量和研究直流稳压电源、蓄电池等电源的负载特性,设计了一台以TI公司的16位超低功耗单片机MSP430F169为中心控制的直流电子负载。外置16位D/A转化芯片ADS1115实时高精度采样电源电压和电流信号,经过单片机程序控制,单片机内置12位D/A转换电路输出一个直流信号并经过运放放大后驱动功率MOS管工作。MOS管作为功率消耗元件,整个电路构成了电压和电流闭环调节系统,可工作于恒压和恒流2种模式。被测电源的输出电压、输出电流和负载调整率可以实时测量并显示在图形液晶显示屏上,电流和电压的测量精度可达(0.02%±0.02%FS)。电子负载人机交互友好,测量精度高,单片机外围电路简单,可靠性高,扩充性好,具有很强的实用价值。 相似文献
5.
本设计分两部分:直流稳压电源部分和漏电保护部分,核心思想为PID调整,硬件主要包含4个模块:微控制器核心模块、直流稳压电源调整模块、漏电保护控制模块以及液晶显示模块。微控制器选用STM32,电源额定输出电压5V,微控制器根据采样到的电压计算出功率,并实时显示。漏电保护控制模块的动作电流为30mA,由漏电保护控制模块控制断电。 相似文献
6.
《黄冈职业技术学院学报》2017,(2):101-104
为设计并实现具有输出电压调节功能的直流稳压电源,采用STC89C51RC单片机为核心控制器,用输出信号采集调理电路对输出的电压、电流进行实时采样,并将采样值送入控制器处理,然后在数码管上显示当前输出的电压或电流值。通过按键可以自己设定输出电压值,然后由DAC转换电路将设定值转换后由模拟电路输出。系统具有过流保护和报警提示功能。实验结果表明该系统性能稳定可靠,有很好的应用价值。 相似文献
7.
张春芝 《北京工业职业技术学院学报》2004,3(1):34-37
提出了一种利用单片机对零序电流和零序电压进行相位比较,改进一般智能漏电保护装置的新方法.该方法可以加快漏电信号的检测速度,减少中间处理环节,提高保护系统的可靠性和灵敏度. 相似文献
8.
9.
《实验室研究与探索》2019,(9):112-115
结合磁耦合谐振式无线电能传输的相关系统,以高性能单片机为控制核心,设计了一款连续可调、两路输出、数字化、智能化的稳压电源。其中将无线电能传输系统产生的电能作为稳压电源系统的驱动电压,采用按键输入的方式,集成各种数据处理电路,在检测和控制软件的支持下,调整和控制稳压电源的工作状态,实现两路电压的输出,并用实验验证了该系统的可行性。实验结果表明,该电源稳定性较好,可靠性较高,其性能优于传统的直流稳压电源。 相似文献
10.
11.
12.
13.
《海外英语》2007,(5):10-11
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? 相似文献
14.
《海外英语》2007,(4):36
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. 相似文献
15.
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. 相似文献
16.
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. 相似文献
17.
18.
RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
19.
20.
唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献