MAX1480在蓄电池参数检测系统中的应用

介绍了一种大容量蓄电池的实时参数检测系统。该系统实现了对蓄电池组中每块蓄电池的电压、温度、电解液液面高度限等参数的实时检测。控制器以LPC2104为核心,在μC／OS-Ⅱ基础上开发应用软件,传感装置以PIC18F2420为核心,软件采用前后台方式运行。     

ZK框架调用EJB3的解决方案

在介绍AJAX应用程式开发框架-ZK和EJB官方新标准-EJB3之后,剖析了二者结合的特性,总结了现有的本地调用EJB3的方法。针对官方尚未给出的ZK框架如何远程调用EJB3的问题,通过实例给出了解决方法,为企业级的AJAX应用程序的开发提供了参考。     

基于Profibus-DP的智能称重从站的设计

文章提出了一种基于Profibus-DP现场总线的智能称重从站的设计方案,分析了Profibus-DP现场总线的特点,详细介绍了称重传感器信号放大器的设计、MAX1166与AT89C52的接口设计、SPC3与AT89C52的接口设计、以及该智能称重从站的软件设计。实际应用表明,该智能称重从站能满足互操作性以及实时通信的要求。     

Facile synthesis of rutile TiO2/carbon nanosheet composite from MAX phase for lithium storage

Titanium oxide (TiO₂), with excellent cycling stability and low volume expansion, is a promising anode material for lithium-ion battery (LIB), which suffers from low electrical conductivity and poor rate capability. Combining nano-sized TiO₂ with conductive materials is proved an efficient method to improve its electrochemical properties. Here, rutile TiO₂/carbon nanosheet was obtained by calcinating MAX (Ti₃AlC₂) and Na₂CO₃ together and water-bathing with HCl. The lamellar carbon atoms in MAX are converted to 2D carbon nanosheets with urchin-like rutile TiO₂ anchored on. The unique architecture can offer plentiful active sites, shorten the ion diffusion distance and improve the conductivity. The composite exhibits a high reversible capacity of 247 mA h g⁻¹, excellent rate performance (38 mA h g⁻¹ at 50 C) and stable cycling performance (0.014% decay per cycle during 2000 cycles) for lithium storage.     

矿用直流不间断电源的设计

设计了一种煤矿井下交换机用直流不间断电源。该不间断电源采用MAX713电源管理芯片对镍镉电池进行智能充电;采用MSP430F147单片机作为微处理器,利用外部中断方式监测矿用交流电的工作状态,当发现矿用交流电不能正常供电时对电路进行切换,启动镍镉电池供电,从而保证交换机持续工作。测试结果表明,该不间断电源具有一定的实用性。     

视频字符叠加器叠加芯片比较

字符叠加（0sD）是一种在视频电子信号中叠加字符信息,使得电视图像中叠加有字符或汉字图形的技术。目前这项技术的应用极其广泛,因此,针对这种需求,结合市场最新技术对实现视频字符叠加进行研究与设计。文章论述了视频字符叠加的原理,并描述了目前市场上流行的叠加芯片的技术指标,就不同的芯片的不同的方案提出分析论证：着重了解MB90092、UPD6453和MAX7456方案的特性与使用方法。     

CC430F5137的无线温度采集报警系统设计

针对目前温度采集报警系统功耗大、应用场合有限等缺陷,设计了一种基于CC430F5137单片机的低功耗无线通信温度采集报警系统.本系统具有功耗低、精度高、无线传输可靠性高等特点.介绍了CC430F5137芯片的特点和系统的硬件结构原理,给出了系统硬件设计框图和软件流程,并详细地分析了温度采集模块和RF无线收发模块.实验结...     

基于系统管理IC的电源管理方案

嵌入式系统中CPU、ASIC、FPGA、存储器等复杂器件通常需要严格的电源排序。文章以MAX16046系统管理芯片为核心,提供了高度集成的排序、监测和电源裕量调节解决方案,并给出了实现该方案的具体步骤。     

分布式航行信号灯灯丝故障监测系统

针对船舶航行信号灯的使用环境及其要求,研制了一种分布式航行信号灯灯丝故障监测系统,采用从站和PC机两层结构监测,监测能力为8～256个点.主站与从站、主站与PC机均采用成熟的MAX485通信电路.故障时从站立即报警,并将故障航行信号灯状态数据发送到主站;主站分析处理后将故障航行信号灯的状态数据传送到PC机;PC机的人机...     

Circular polarized dual‐band antenna for WLAN/Wi‐MAX application

A novel square ring printed antenna has been suggested for dual‐band circular polarization (CP). The geometry contains a square patch and a square ring structure for dual‐band operation. Circular polarization is achieved using triangular cut at the boundary and right angle bend with inner perturbation. The suggested antenna is excited from the lower layer through electromagnetic (EM) coupling technique. The antenna shows good impedance bandwidths of 90 MHz (2.43‐2.52 GHz) and 800 MHz (5.7‐6.5 GHz, respectively. The antenna shows 3 dB axial ratio bandwidth of 20 MHz at lower band and 120 MHz at upper band with improved gain > 6 dBi. The simulated and measured results are well agreed with each other. The antenna is promising wideband operation at the upper band. This antenna was implemented on fiberglass reinforcement laminated Arlon substrate with dielectric constant (?_r = 2.55), and the overall physical dimension of 30 × 30 × 3.048 mm³. The designed antenna can be extensibly applicable in WLAN/Wi‐MAX communication. The presented antenna is designed using hyperlynx IE3D and the simulated results are presented.