INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference最新文献

{"title":"Offer internet connections in remote areas and lower the cost of ownership","authors":"L. Efraimsson, J. Ahman","doi":"10.1109/INTLEC.2008.4664083","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664083","url":null,"abstract":"Optimizing energy efficiency will not only reduce environmental impact, it will also cut network costs and help to make communication more affordable for everyone. No data communication would be possible without electrical energy and a data connection. Ericssonpsilas Remote Power system offers an electrical and data network optimized for the electrification and data transmission to data communication sites. Remote power can be used for distributing small amounts of power to repeaters over long distances or power to several sites in a cluster.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"94 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114103490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel tapped inductor bi-directional Buck-Boost topology","authors":"Weiming Lin, Jinhui Wang, Junlai Huang, Yuzhen Xu","doi":"10.1109/INTLEC.2008.4664124","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664124","url":null,"abstract":"This paper proposes a novel tapped-inductor bi-directional buck/boost (TI-B-buck/boost) topology, which can overcome the drawback of non-isolated bi-directional DC-DC (BDC) that its transfer ratio is restricted in a small range. This paper analyzes the principle and characteristics of TI-B-BUCK/BOOST in detail. Then, the optimization of the turn ratio of tapped-inductor based on power loss model of the new topology has been done. Computer simulation based on MATHCAD and experimental result on a prototype built in lab verify that TI-B-BUCK/BOOST widely extends the transfer ratio of non-isolated BDC and its efficiency is much higher than conventional bi-directional BUCK/BOOST.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"37 13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116788172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Power distribution architecture for tele- and data communication system based on new generation intermediate bus converter","authors":"R. Miftakhutdinov","doi":"10.1109/INTLEC.2008.4664116","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664116","url":null,"abstract":"Paper addresses new advances in intermediate bus architecture in its historical perspective as further improvement of distributed power system for tele- and data communication equipment. The modern requirements to intermediate bus converter and its design challenges are addressed in details. Experimental data for bus converter using advanced control approach are provided.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130805635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of three-dimensional thermal simulation model of lithium-ion secondary battery","authors":"T. Matsushita, K. Yabuta, T. Tsujikawa, T. Matsushima, M. Arakawa, K. Kurita","doi":"10.1109/INTLEC.2008.4664071","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664071","url":null,"abstract":"We are developing a large-capacity lithium-ion secondary battery as a backup power supply for next generation communications. The lithium-ion secondary battery has the advantage of very high energy density. However, the temperature of the battery rises when overcharge or internal short-circuit occurs. If the temperature of the battery exceeds a constant value, there is a danger that the positive electrodepsilas active material may decompose, oxygen may be discharged, the electrolysis liquid may burn, and rapid ignition (thermal runaway) may occur. In general, lithium-ion secondary batteries come in three shapes (cylinder, flat, and accumulating). A structural examination of the temperature increase is indispensable to develop a large-capacity lithium-ion secondary battery. We developed a highly accurate three-dimensional thermal simulation model using the finite-element method.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129736203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel telecom power system","authors":"O. Shirazi, O. Onar, A. Khaligh","doi":"10.1109/INTLEC.2008.4664125","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664125","url":null,"abstract":"Typically, telecom power systems are connected to grid and diesel generator. This paper represents a new telecom power system using local micro-sources (fuel cell and micro-turbine). Some benefits of this system are effectively eliminating batteries, diesel generator and automatic transfer switch. In this paper, a new multiple input buck-boost converter is utilized as an interface between the micro-sources and the DC bus. Peak current mode control is used to control the current of fuel cell while voltage mode control is used to regulate the output voltage. A model for Proton Exchange Membrane Fuel Cell (PEMFC) and Micro-Turbine (MT) along with their subcomponents and internal controls are presented. Furthermore, the parallel operation of FC and MT using the proposed multiple input DC/DC converter is investigated. In addition, the dynamic response of the system to the dynamic behavior of the load is analyzed.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125561470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reducing computational time delay in digital current-mode controllers for dc-dc converters","authors":"Kai Wan, M. Ferdowsi","doi":"10.1109/INTLEC.2008.4664114","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664114","url":null,"abstract":"A new method to improve the performance of digital current-mode controllers used in dc-dc power conversion is introduced. The proposed scheme is based on a simple prediction method which offers more time for DSP calculations than its conventional counterparts. Therefore, there will be less DSP computational time delay, which results in faster dynamic response and more accuracy and stability in power electronic converters. Principles of operation of the proposed prediction method as well as its application to several digital control techniques are presented.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123938457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aisle-capping method for airflow design in data centers","authors":"M. Takahashi, T. Uekusa, M. Kishita, H. Kaneko","doi":"10.1109/INTLEC.2008.4664047","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664047","url":null,"abstract":"This report describes cold aisle capping and hot aisle capping methods, one of the airflow design techniques for data centers and telecommunications equipment rooms where high heat density equipments are installed in racks. In both cold and hot aisle capping, the aisles are enclosed by sidewalls at the end of the aisle and by a ceiling over the aisle. These are expected to provide effects of improving hot spots, which are caused by the exhaust air flowing into the cold aisle, and to provide an energy-saving effect by reducing the energy loss, which is caused by mixing of the supply air and the exhaust air of the IT equipment. This report presents the results of an experiment on the effects of improving the hot spots, energy-saving, and temperature-rise suppression during air-conditioner shutdown in the case that each method is applied. A practical example of installing the cold aisle capping in an existing equipment room is also described.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131290930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Applied ohmic battery testing in a global mobile telecommunications operator: A multi-year study","authors":"Jian Gao, Longyun Yu","doi":"10.1109/INTLEC.2008.4664076","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664076","url":null,"abstract":"Since the year of 2006, China Mobile had carried out field tests on hundreds of strings of batteries to verify how conductance/impedance tests could indicate the battery's health condition and its capacity, results of which has been presented in 2007 Intelec paper. With the conclusions drawn from the validation filed tests, China Mobile started to apply the ohmic testing technology in the practice of battery maintenance work, including using conductance testing on approval inspection before installation of new batteries, which has greatly improved working efficiency and more importantly, helping improving the stability of the quality of the batteries delivered, and using conductance testing in regular battery maintenance work greatly help to screen out defective batteries and to decrease failing cases compared with before. The simple fast testing method has proved to be most practical tool to be used for the patrol tests of batteries in thousands of base stations right after the snow storm calamity happened in China in the Spring of 2008 and the earthquake happened in May in Sichuan Province. This paper will then further focus on the new database software's development and its applications in Zhejiang province. With more and more ohmic testing data and load testing results of the batteries accumulated and uploaded in to the database software platform, clearer and more exact relationship between ohmic testing value and load tests data are obtained day after day. With the abundance field tests data, BHItrade (Battery Health Indextrade) was developed, which is a key part of the database software system. BHI includes 34 different parameters that have influence on the battery's condition. It is designed and developed to get relatively reliable information of the battery's current health condition with fewer cumbersome load tests. With this same database software system, a complete battery profile is set up, and health condition of each individual battery could be assessed, anytime and anywhere. Data continues accumulating from regular maintenance work and uploaded into the software system, and new study and analysis of battery condition progresses. With more understanding of ohmic testing and more confidence in the technology Chinese telecom operators will need to perform fewer discharge tests in the future, saving time and money.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"263 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116238147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lossless DCR current sensing for multi-winding coupled inductors","authors":"B. Oraw, R. Ayyanar","doi":"10.1109/INTLEC.2008.4664023","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664023","url":null,"abstract":"Lossless DCR current sensing is common in multiphase point of load converters. A multiphase buck with coupled inductors exhibits a larger steady state inductance than transient inductance. Since there are two distinct values of inductance, it unclear which value to use in the conventional DCR sensing scheme. A first assumption might be to use the transient inductance, so that closed loop stability is not compromised. The current slew will be measured accurately, but the measured ripple magnitude will be incorrect. Accurate measurements of both the ripple and the current slew of coupled inductors cannot be produced using conventional DCR sensing. This paper proposes a new DCR sensing scheme that resolves the inaccuracies of conventional sensing.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124892535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Avoiding power & cooling system disasters at Telecom New Zealand through structured risk management","authors":"D. Monkman","doi":"10.1109/INTLEC.2008.4664068","DOIUrl":"https://doi.org/10.1109/INTLEC.2008.4664068","url":null,"abstract":"Engineering services infrastructure is critical to the operation of modern telecommunications buildings. These buildings have become ever more complex, the most complex house multiple networks and multiple supporting systems that have grown quickly in response to demand from network, this has led to a situation where individual systems have been considered separately without evaluation of impacts on other building uses. Previously regular changes in Network Technology ensured that systems were tidied up and any redundant capacity that had been consumed due to growth was reinstated. The current NEAX PSTN network has been operating for more than 20 years and the migration to the future NGN technology is not expected to be completed before 2012, therefore this long technology lifecycle adds to the quantum of risk at Telecom New Zealand (Telecom) sites. This paper outlines the results achieved from a structured risk management programme of Telecom's major sites.","PeriodicalId":431368,"journal":{"name":"INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124034581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}