小型局域网络数据传输及无线供电方案

随着智能化思想的推广,许多小型局域网的技术革新加快,许多传统的数据传输和供电方案已经不满足现需求,而无线数据传输和无线供电技术提供了技术支持。通过分析无线数据传输和无线供电的技术的优缺点,设计出一个适合小型局域网络使用的无线数据传输技术和无线供电技术,并给出应用试点。两种技术的结合将给人们生活带来更多的经济性、便利性、环保性。     

巧制巧用无线电源

<正> 无线供电不仅割掉了电器的"尾巴",实现了电器与电源的完全分离,同时,由于没有电线与电器相连,也从根本上解决了电器的用电安全问题,更重要的是,无线供电可以利用常见的非金属如塑料、木板、玻璃、石块等(也包括水和空气)材料,这是采用有线供电的方式无法做到的,因此,无线供电不但可以用于常见电器和一般环境中,还可以用于许多特种电器和特殊环境中。总之,无线供电具有安     

体验ZigBee技术应用在无线抄表系统

日前,本刊记者受邀来到北京顺义供电公司项目现场,切身体验了一回ZigBee技术在无线抄表系统的现场应用。WSN无线模块该无线抄表系统是北京顺义供电公司和北京新鸿基瑞程科技有限公司合作,与2005年启动的无线自动抄表项目。     

期待无线供电覆盖区域Wi—Power

如今的人们使用着各种无线电子产品,包括手机、移动显示器、平板电脑,甚至是电池。互联网也从有线连接转为无线连接。然而,这些无线电子设备的充电能否摒弃最后的电缆线呢？现在,研究人员和工程师们正试图集中致力于开发无线供电技术。就像如今我们身边无处不在的Wi—Fi覆盖区域,未来的餐馆和街头将会涌现出许多为我们的电子设备供电的无线供电覆盖区域Wi—Power。     

易用的三端无线供电芯片组VOX05MP01和VOXR10D

自2007年美国麻省理工大学完成的基于电磁共振的实验后，无线供电在网络媒体上曾被过度炒作，以致有人借了东风，设计了多种远程的无线供电的电路，有的无线供电距离甚至长达数百米，这当然是“忽悠”。如今两年过去了，却很少见到一个真正的无线供电产品在市场上流行。究其原因．是因为电磁共振有其自身的特性和缺陷，主要归结为以下几点：     

无线能量传输技术

无线能量传输技术是随着对无接触供电的需求不断增加而逐渐发展起来的新技术。该技术不依赖于有线的传输媒介,对于有线供电部署困难的场景尤其是人体内部医用装置的供电具有重要的意义。本文重点介绍无线能量传输技术的发展及当前主要的研究热点和研究方向。同时针对无线能量传输技术存在的问题和应用前景进行了介绍。     

无线供电技术的发展和应用前景

“无线充电”,顾名思义就是利用一种特殊设备在不依赖电线的情况下直接对电子设备充电,一般可分为电磁感应式（利用电流通过线圈产生磁场实现近程无线供电）、磁场共振式（利用磁耦合共振效应近程无线供电）、电波辐射式（电力转换成电波以辐射传输供电）3种方式,是一种安全方便的新技术,无需任何物理上的连接,可以将电能近距离无接触地传输给负载。     

太阳能供电的无线传感系统的设计

布置在野外的无线传感网络的供电问题极大地束缚了该系统的生命周期,为了延长该系统的生命周期,该文设计了一种太阳能供电方案,介绍了该供电电路在无线传感网络中的应用,通过实验分析了该系统的工作情况,所测温度和湿度的准确度。     

采用无线单片机的高压供电监测器设计

本文针对电压互感器和电流互感器在高电压供电监测中具有较高的绝缘要求以及较大的体积等不足,对一个完整的基于无线单片机的高压供电监测器进行了设计,因为该电路当中对数据的传输是通过无线单片机无线的方式进行的,因此彻底的分开了高压与低压侧,其不仅将高压绝缘问题的问题解决了,同时还具有更强的功能以及更小的体积。     

太阳能供电的氧含量无线监控系统设计及效能

目前,市场已有的含氧量检测的产品只适用面积小、实时监测点少的养殖场,而大养殖场因分区养殖,且养殖种类所需含氧量不一,需实时监测点多,且分布分散,均采用电线供电,导致布线复杂,成本较大,且存在安全隐患。本太阳能供电氧含量无线监控系统,利用太阳能供电的无线传感器节点测得各监测区域中的温度和溶氧量,并通过无线模块将数据传输到终端控制系统,终端控制系统根据各路监测点发回来的数据作出判断,再通过无线的方式控制各路监测点对应的增氧机工作状况,异常情况会发出声光报警。     

Repeater Powering Plans for Fiber Optic Communication Systems

Repeater powering plans are reconsidered from the standpoint of fiber optic transmission. It is shown that conventional powering plans are quite inefficient. It is also shown that ordinary methods for analyses are inconvenient for studying powering network. A method that significantly simplifies the analyses is proposed. According to this method, the general solution can easily be obtained from a special solution. Repeater powering plans are classified and compared to show the efficiency of the method. The comparison proves to be quite convenient for choosing efficient powering plans in accordance with applications. In general, some classes of parallel powering plans receiving relatively high voltages (a few hundred volts) are preferable from the practical standpoint. Further considerations for realizing economical powering networks have been discussed. It is suggested that the development of optical devices and design of transmission equipment should carefully be based on these considerations. For example, development of photo diode (APD) with low-breakdown voltage is not required and the inclusion of high-voltage generators in repeaters is neither necessary nor desirable from the standpoint of repeater powering.     

移动通信基站太阳能与油机混合供电方式设计

独立的太阳能供电方式往往要求蓄电池有较长的放电时间，文中提出的太阳能与油机混合供电方式能大大减少蓄电池容量，有效增加蓄电池寿命，提高移动通信基站的供电可靠性。     

计算机系统的供电方案改造

单一在线式UPS供电系统的供电方式不能满足电信分公司计费帐务中心网络设备的需求,为此对莆田市电信分公司计费帐务中心网络的供电进行了分析与改造,提出了双总线供电系统方案,提高计算机系统供电的安全性。     

RF-Powered Cage System for Implant Biotelemetry

A radio-frequency-powered rectangular cage (1 m ×0.75 m ×0.75 m) has been designed to power a biotelemetry transmitter implanted in animals. Electromagnetic coupling is used in place of conventional batteries to supply dc power to the implant, thus extending the lifetime of the implant unit indefinitely. The same frequency is used for both RF powering and signal transmisision by a time-sharing scheme. The result of the design, construction, and testing of the RF powering system in the laboratory as well as an animal evaluation with a rabbit to telemeter ECG under "normal" living conditions over 24 months are reported.     

A Remotely Reconfigurable Remote Node for Next-Generation Access Networks

A remotely reconfigurable remote node (RN) for next-generation (NG) access networks is proposed and demonstrated. The RN is remotely reconfigured by instantaneous optical powering at the central office through feeder fiber and maintained in a passive state by employing optical latching switches (OLSs). The feasibility of the proposed RN is demonstrated by investigating the operating conditions of optical powering for the reconfiguration and its nonlinear effect both for time-division-multiplexing passive optical network (TDM-PON) as legacy services and wavelength-division-multiplexing passive optical network (WDM-PON) as NG services. The existence of OLSs for reconfigurability and crosstalk effect between TDM-PON and WDM-PON are negligible on transmission performance.     

Powering Implantable and Ingestible Electronics

Implantable and ingestible biomedical electronic devices can be useful tools for detecting physiological and pathophysiological signals, and providing treatments that cannot be done externally. However, one major challenge in the development of these devices is the limited lifetime of their power sources. The state-of-the-art of powering technologies for implantable and ingestible electronics is reviewed here. The structure and power requirements of implantable and ingestible biomedical electronics are described to guide the development of powering technologies. These powering technologies include novel batteries that can be used as both power sources and for energy storage, devices that can harvest energy from the human body, and devices that can receive and operate with energy transferred from exogenous sources. Furthermore, potential sources of mechanical, chemical, and electromagnetic energy present around common target locations of implantable and ingestible electronics are thoroughly analyzed; energy harvesting and transfer methods befitting each energy source are also discussed. Developing power sources that are safe, compact, and have high volumetric energy densities is essential for realizing long-term in-body biomedical electronics and for enabling a new era of personalized healthcare.     

Josephson macrocell array

A modified variable-threshold logic (MVTL) gate for use in Josephson LSI circuits is considered. A 7.6 K-gate Josephison macrocell array whose functions can be changed by wiring changing has been developed. Automatic design problems, such as AC powering and small fan-outs, are solved by constructing the macrocell with a three-phase powering system and developing a magnetically coupled unit cell. The chip contains 21440 Josephson junctions on a 5 mm×5 mm die and is fabricated using 1.5 μm all-niobium Josephson techniques. An average delay of 5.3 ps/gate in the macrocell and a total chip power consumption of 23 mW have been obtained     

Analysis and design methods for broadband power systems

As more distributed approaches like those employed in broadband replace traditional methods of powering telecommunication networks, maintaining the present high levels of reliability and availability while minimizing cost requires that a thorough network analysis be conducted as an integral part of the design process. We present an analysis methodology for broadband power network design and illustrate it using examples. We also demonstrate how such analyses can be very useful, especially in the early planning and architecture determination stages, by providing comparisons between powering voltages with different waveforms     

Increasing the accuracy of thermal transient measurements

Recent developments in the methodology of thermal transient measurements and evaluation are discussed in the paper. All of them are aimed at increasing the accuracy of these measurements and their evaluation. After a short summary of the evaluation methodology a procedure is presented for the correction of the nonconstant powering. New methods are presented for the compensation, evaluation and modeling of the nonlinearities. Various aspects of pulsed powering are discussed in detail.     

中、小型双总线UPS供电系统

介绍了一种适用于中、小型电子设备机房双总线的不间断供电系统,该系统采用双路输入、双路输出母线供电方式,克服了“1 1”简单冗余并机的UPS供电系统的不足之处,在一定程度上提高了整个系统的可靠性和稳定度,最后对这种系统存在的问题作了一些简单的探讨。