恒流/恒压充电方式的锂电池充电器芯片

提出了一种基于恒流-恒压(CC-CV)充电模式的锂电池充电器.在CC-CV充电模式下,充电器先给电池提供大的充电电流;在电池电压尚未到达饱和之前,充电电流便开始减小;电池电压达到饱和并保持恒定之后,充电电流进一步减小.这种充电方法,能够避免在电池电压的饱和值附近仍对电池进行大电流充电,从而导致过热现象.对这块充电器芯片核心电路的创新设计,保证了这种CC-CV充电模式的实现.本芯片采用CSMC公司0.6μm的CMOS工艺流片.测试结果验证了本文提出的CC-CV充电模式的实现.充电完成后,锂电池电压为4.1833V.     

恒流-恒压模式控制的锂电池充电器的设计

设计了一款恒流-恒压充电模式控制的锂离子电池充电器,当电池电压低于2.9 V时,充电器提供涓流充电模式;当电池电压高于2.9 V时,充电器提供恒流充电模式;当电池电压达到4.2 V时,实现恒压充电模式对充电器的控制,充电电流减小。对主要子模块的电路进行了详细的设计与仿真并进行了稳定性分析,均能够在不采用任何补偿的情况下保持稳定。电路采用CSMC公司的0.6μm B iCMOS工艺模型,基于Cadence仿真平台对电路进行了前仿真,仿真结果表明,在5 V电源电压下,涓流充电电流为50 mA,恒流充电电流为502 mA,最终电池电压为4.202 V。     

车载智能锂电池充电器的设计与实现

设计一款新型车载智能锂电池充电器,根据电池的当前状态,如电池容量、电池电压、电池放电速率、电池温度等参数,实时调节充电器的充电电流、充电电压及充电时间;设计智能充电器的闭环拓扑反馈系统实时评估电池状态、对充电流程及充电模式进行动态调整,确保充电最优化及效率最大化。文章重新提出一种新型充电模式,并对充电器的硬件电路进行了设计,搭建了软件流程图及框架,根据智能充电器工作流程获得智能充电器的曲线。实验结果表明：智能充电器的充电效率有了明显提高,适用于工生产需求,并对电池的寿命维护及安全使用都有巨大改善。     

基于P型功率管电流采样和自适应参考电压的Buck型充电器设计

介绍了一种具有高效率、开关频率为2 MHz的Buck型锂电池充电器,它的工作过程分为启动、小恒定电流充电、大恒定电流充电、恒定电压控制和结束五个阶段。在恒流充电阶段,通过对P型功率管电流的采样和采用自适应参考电压,可以对充电电流的平均值进行控制,使得充电电流恒定,不受电池电压升高的影响。在恒压控制阶段,附加一条电压反馈回路,使得恒流阶段到恒压阶段的转换平滑。本设计用2P4M 350nm CMOS工艺实现,芯片面积2.8mm2。测试结果表明,芯片实现了充电的完整过程,其充电峰值效率为91%。     

一种基于复合运放的线性锂离子电池充电器

基于复合运放,设计了一款新颖的线性锂离子电池充电器.该充电器根据锂离子电池充电的特性,采用三阶段充电法,即涓流充电(预处理),恒流充电(快充),恒压充电(充满).仿真结果显示,在4.5 V电源电压下,充电器实现了涓流充电电流80 mA,恒流充电电流800 mA,及恒定电压4.2 V的充电过程.另外,设计中利用充电功率管的栅极寄生电容作为充电环路的补偿电容,节省了芯片成本和面积.     

用太阳能电池供电的锂电池充电管理集成电路的设计

本课题研发成功了一款具有自主知识产权的集成电路芯片,该集成电路主要用于使用太阳能电池为锂电池充电的领域。其主要功能包括：利用太阳能电池对锂电池进行恒流/恒压充电;充电的过程中实时监测电池的温度,监测输入/输出电压,以保证安全有效的对电池充电;充电状态自动控制功能;芯片温度调制电路;根据太阳能电池的输出电流能力自动调整充电电流的功能。该芯片还具有集成度高,应用电路简单等优点。     

智能锂电池充电器研究与设计

本设计是一款基于单片机的智能锂电池充电器,主要是在原有的锂电池的基础上增加一块单片机智能控制电路。STM32F103单片机作为核心控制器,并外接12864串口液晶LCD屏,利用STM32Cube MX以及IAR Embedded Workbench软件进行单片机配置及程序编写,实现显示当前充电状态、充电耗时、预计完成时间以及当前充电电压和电池电压。同时为了让充电器更加智能化,本设计加入FS4059锂电池充电管理芯片,从而提高锂电池充电质量。     

Ni电池与充电——充电方便才是好电池

充电技术镉镍电池的充电器根据其技术完善程度可以分成很多种类，最简单的一种莫过于慢速充电器了，这种充电器一般是一个输出电压固定的直流变压器，充电电流的大小取决于变压器内阻或者外加电阻的大小。慢速充电对于镍氢电池或镍镉电池是不利的，因为充电过程中不断产生的热量会加速电池老化。廉价的慢速充电器一般不会对充电电流进行很好地滤波，因此对电池的损害要严重许多。专为镍氢电池和镍镉电池优化设计的快速充电器在技术上要复杂得多，这种充电器一般设计有电流调节器、限压保护电路和充电控制电路。充电控制电路能根据电池的温度…     

元器件快讯

高度集成的锂离子及锂聚合物电池充电器微芯科技公司推出MCP73831型高度集成的单节锂离子及锂聚合物电池充电管理控制器。MCP73831在单个芯片上集成了通道晶体管、电流感应和反向放电保护功能,可减少电池充电器设计所需的系统元件数目,从而大大降低系统成本。这种集成的充电器可提供精度高达0.5%至0.75%的输出电压调节,优化充电效果并延长电池寿命。可供选择的DFN封装提供高达500 mA的充电电流,确保快速充电。该控制器还具有片上热能调节功能,当温度过高时能自动降低充电电流,防止器件损坏。此外,MCP73831的充电电流是用户可编程的,设…     

对线性、单芯锂离子电池充电器做功能测试的简单装置

现在大多数的电池充电器都采用开关模式.但是现在也存在着一种用于现代单芯锂离子的线性IC充电器的合适应用,这种电池的单芯电压为4.2V.此外,适用于单芯锂电池的5VDC供电很普遍.线性充电器用5V电源电压为锂离子芯充电时,效率η大约为4.2V/5V,或84%.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first