负载是指连接在电路中的电源两端的电子元件。电路中不应没有负载而直接把电源两极相连,此连接称为短路。常用的负载有电阻、引擎和灯泡等可消耗功率的元件。不消耗功率的元件,如电容,也可接上去,但此情况为断路。
上传时间: 2013-11-06
上传用户:txfyddz
The CN3052A is a complete constant-current /constant voltage linear charger for single cell Li-ion and Li Polymer rechargeable batteries. The device contains an on-chip power MOSFET and eliminates the need for the external sense resistor and blocking diode.
上传时间: 2013-11-10
上传用户:子虚乌有
Although recent popular attention is focused on LithiumIon batteries, one must not forget that other batterychemistries, such as Nickel Cadmium (NiCd) and NickelMetal Hydride (NiMH) have advantages in rechargeablepower systems. Nickel-based batteries are robust, capableof high discharge rates, have good cycle life, do notrequire special protection circuitry and are less expensivethan Li-Ion. Among the two, NiMH batteries are rapidlyreplacing NiCd because of their higher capacity (40% to50% more) and the environmental concerns of the toxiccadmium contained in NiCd batteries.
上传时间: 2013-11-04
上传用户:qq10538412
Advances in low power electronics now allow placementof battery-powered sensors and other devices in locationsfar from the power grid. Ideally, for true grid independence,the batteries should not need replacement, but instead berecharged using locally available renewable energy, suchas solar power. This Design Note shows how to producea compact battery charger that operates from a small2-cell solar panel. A unique feature of this design is thatthe DC/DC converter uses power point control to extractmaximum power from the solar panel.
上传时间: 2014-01-20
上传用户:wettetw
The LTC®4099 high effi ciency USB power manager andLi-Ion/Polymer battery charger seamlessly managespower distribution from multiple sources in portableapplications. It is differentiated from other USB powermanagers by its bidirectional I2C port that allows the hostmicroprocessor to control and monitor all aspects of theUSB power management and battery charging processes.In addition, a programmable interrupt generation functionalerts the host microprocessor to changes in device statusand provides unprecedented control of power managementfunctions. This high degree of confi gurability allowspost-layout changes in operation, even changes in thefi eld, and it allows a single qualifi ed device to be usedin a variety of products, thus reducing design time andeasing inventory management.
上传时间: 2013-10-22
上传用户:18602424091
随着消费者购买便携设备数量的增多,他们也被具有各种非标准连接器的诸多电源适配器所束缚。为了解决这一问题,微型USB接口成为电池充电和数据传输的标准。MAX14578AE/MAX14578E过压保护充电检测器和限流开关大大简化了微型USB端口的设计,从而使终端用户操作更加轻松
上传时间: 2013-10-09
上传用户:chukeey
在LED太阳能路灯系统中,本方案用于跟踪太阳能电池板的最大功率,以最大效率为蓄电池充电。基于MPPT控制器NCP1294的参考设计最大功率点追踪误差小于5%,可以为串联或并联的四个电池充电,能配置10W到30W的太阳能电池板。MPPT控制器即最大功率点跟踪控制器。
上传时间: 2013-10-31
上传用户:JIMMYCB001
报告摘要:公司是国内规模最大的通信用阀控密封蓄电池专业生产企业之一:主营业务为化学电源、新能源储能产品的研究、开发、制造和销售。产品主要应用于通信领域,同时在太阳能、风能等储能系统和车用动力系统等领域也有广泛应用。公司于2008年12月收购了上海锂电锂离子电池经营性资产后,将锂离子电池业务的相关研发、生产和销售纳入了公司的整体经营体系中。
上传时间: 2013-11-10
上传用户:edisonfather
在通讯电源的应用中,电源的容量都大于实际负载的用量,这一方面是为了保证有足够的容量用于电池充电,另一方面也是考虑扩容的需要。这样的话,往往电源系统由于带载率低而低于最佳效率点运行。艾默生公司发明的电源休眠节能技术可以控制实际工作的整流模块容量,从而使电源系统接近最佳效率点运行。其主要优点是:
上传时间: 2013-10-21
上传用户:朗朗乾坤
TLC2543是TI公司的12位串行模数转换器,使用开关电容逐次逼近技术完成A/D转换过程。由于是串行输入结构,能够节省51系列单片机I/O资源;且价格适中,分辨率较高,因此在仪器仪表中有较为广泛的应用。 TLC2543的特点 (1)12位分辩率A/D转换器; (2)在工作温度范围内10μs转换时间; (3)11个模拟输入通道; (4)3路内置自测试方式; (5)采样率为66kbps; (6)线性误差±1LSBmax; (7)有转换结束输出EOC; (8)具有单、双极性输出; (9)可编程的MSB或LSB前导; (10)可编程输出数据长度。 TLC2543的引脚排列及说明 TLC2543有两种封装形式:DB、DW或N封装以及FN封装,这两种封装的引脚排列如图1,引脚说明见表1 TLC2543电路图和程序欣赏 #include<reg52.h> #include<intrins.h> #define uchar unsigned char #define uint unsigned int sbit clock=P1^0; sbit d_in=P1^1; sbit d_out=P1^2; sbit _cs=P1^3; uchar a1,b1,c1,d1; float sum,sum1; double sum_final1; double sum_final; uchar duan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; uchar wei[]={0xf7,0xfb,0xfd,0xfe}; void delay(unsigned char b) //50us { unsigned char a; for(;b>0;b--) for(a=22;a>0;a--); } void display(uchar a,uchar b,uchar c,uchar d) { P0=duan[a]|0x80; P2=wei[0]; delay(5); P2=0xff; P0=duan[b]; P2=wei[1]; delay(5); P2=0xff; P0=duan[c]; P2=wei[2]; delay(5); P2=0xff; P0=duan[d]; P2=wei[3]; delay(5); P2=0xff; } uint read(uchar port) { uchar i,al=0,ah=0; unsigned long ad; clock=0; _cs=0; port<<=4; for(i=0;i<4;i++) { d_in=port&0x80; clock=1; clock=0; port<<=1; } d_in=0; for(i=0;i<8;i++) { clock=1; clock=0; } _cs=1; delay(5); _cs=0; for(i=0;i<4;i++) { clock=1; ah<<=1; if(d_out)ah|=0x01; clock=0; } for(i=0;i<8;i++) { clock=1; al<<=1; if(d_out) al|=0x01; clock=0; } _cs=1; ad=(uint)ah; ad<<=8; ad|=al; return(ad); } void main() { uchar j; sum=0;sum1=0; sum_final=0; sum_final1=0; while(1) { for(j=0;j<128;j++) { sum1+=read(1); display(a1,b1,c1,d1); } sum=sum1/128; sum1=0; sum_final1=(sum/4095)*5; sum_final=sum_final1*1000; a1=(int)sum_final/1000; b1=(int)sum_final%1000/100; c1=(int)sum_final%1000%100/10; d1=(int)sum_final%10; display(a1,b1,c1,d1); } }
上传时间: 2013-11-19
上传用户:shen1230