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Proceedings of Intelec 94最新文献

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Modulation of low frequency waveforms by AC-AC resonant converter 用交流-交流谐振变换器调制低频波形
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396584
P. Bauer
{"title":"Modulation of low frequency waveforms by AC-AC resonant converter","authors":"P. Bauer","doi":"10.1109/INTLEC.1994.396584","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396584","url":null,"abstract":"Soft switching resonant converters utilize pulse frequency modulation techniques in order to synthesize a low frequency behaviour. In this paper pulse modulation techniques are analyzed. A novel control approach based on the space vector dynamical equation is suggested. The obtained equations prescribe the dynamics of the entire converter including the filters. The modulator designed on their base can solve drawbacks of pulse modulation techniques. The sliding mode control is considered in order to control the power factor of the pulse modulated converter.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132749699","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}
引用次数: 0
A novel zero voltage switching half bridge converter 一种新型零电压开关半桥变换器
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396595
K. Yoshida, T. Isbii, B. Handa
{"title":"A novel zero voltage switching half bridge converter","authors":"K. Yoshida, T. Isbii, B. Handa","doi":"10.1109/INTLEC.1994.396595","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396595","url":null,"abstract":"A novel zero voltage switching half bridge power converter is presented. This power converter achieves zero voltage switching of main switches and zero current switching of a secondary diode while maintaining low voltage stress of the main switches. High efficiency power conversion is realized at high frequency switching. A prototype of a low profile 50 W DC/DC power converter is designed for an input voltage of 200-400 V and an output of 12 V. High efficiency of 87-85% and small size of 86/spl times/41/spl times/10 mm/sup 3/ are achieved at 500 kHz operation.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133586701","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}
引用次数: 13
Performance assessment of flooded lead acid cells in telephone central office power plants/spl times/focus on round cells 电话中心局电厂淹水铅酸电池性能评价/单次/以圆形电池为重点
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396588
J. O'Connor, W. Cantor, T. Cantor
{"title":"Performance assessment of flooded lead acid cells in telephone central office power plants/spl times/focus on round cells","authors":"J. O'Connor, W. Cantor, T. Cantor","doi":"10.1109/INTLEC.1994.396588","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396588","url":null,"abstract":"The paper presents the correlation of the measured conductance data versus the tested capacity of approximately 300 cells. This paper also discusses two case studies that illustrate specific examples of power plant evaluations using various methods including capacity testing, infrared thermography and conductance measurements. Finally, some conclusions are drawn on the usefulness and accuracy of using conductance measurements alone to assist in the evaluation of battery plants with the round cell.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129656076","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}
引用次数: 2
The impact of AC power line disturbances on telecommunications rectifier technologies and powering architectures 交流电力线扰动对电信整流器技术和供电架构的影响
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396635
B. Lindemark
{"title":"The impact of AC power line disturbances on telecommunications rectifier technologies and powering architectures","authors":"B. Lindemark","doi":"10.1109/INTLEC.1994.396635","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396635","url":null,"abstract":"Switch mode rectifier (SMR) design needs to consider AC distribution, voltage sags and surges, power line notches and voltage transients, including their causes and effects. Influence from lightning has to be more carefully considered. Also the utility load and grid switching, as well as load changes in the AC distribution network close to SMR power plants, are now important considerations. The author discusses these factors and their effects on the SMR.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129392789","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}
引用次数: 2
POWCOM: a system for battery and rectifier surveillance POWCOM:电池和整流器监控系统
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396601
A. Sagebo
{"title":"POWCOM: a system for battery and rectifier surveillance","authors":"A. Sagebo","doi":"10.1109/INTLEC.1994.396601","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396601","url":null,"abstract":"Since the condition of sealed batteries cannot be measured as easily as it can be done with open lead acid batteries, where the acid weight gives a good indication of the battery condition, it is necessary to perform capacity tests of the battery at least 1 or 2 times a year to ensure that the battery has the capacity needed. Other problems usually associated with sealed batteries is the danger of thermal runaway that may cause destruction of the battery. In addition the latest developments in telecom has resulted in a more distributed system with many smaller stations. The maintenance costs should therefore be greatly reduced if battery testing and temperature surveillance could be automated. A system for automated battery tests has been made. Either as a standalone unit or as a intergrated part of the rectifier control unit, this system provides automated battery tests at a low cost. To make transfer of data to PC uncomplicated a PC program, POWCOM, has been developed. This uses the Windows graphical user interface (GUI) to provide an easy to use connection between the rectifier control unit and the user. From this program the rectifiers can be controlled completely. Alarm limits can be set, alarms can be read together with all other data in the control unit. Voltages may be set and special functions like the test function may be activated manually. The program adjusts menus and windows to the type of control unit it has been connected to. Data from tests can be transferred and saved to files for later analyses.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130240152","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}
引用次数: 2
A high-performance integrated power plant 高性能综合动力装置
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396600
M. Boost, J. Nicklaus
{"title":"A high-performance integrated power plant","authors":"M. Boost, J. Nicklaus","doi":"10.1109/INTLEC.1994.396600","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396600","url":null,"abstract":"Outside plant applications for DC bulk power systems have increased greatly. As a result, increasing focus has been brought to bear on the power system to increase its flexibility for a wider variety of applications. Moreover, since the use of advanced technology such as valve-regulated lead-acid (VRLA) batteries and switched-mode rectifiers in the outside plant area is relatively new, a number of problems are now emerging. Consequently, feature requirements of DC bulk power plants have increased beyond basic charger modularity and higher MTBF. Addressing mechanical flexibility, electrical subcomponent compatibility, environmental stresses, and emergency situation control, this paper proposes the design of an integrated power plant, capable of accommodating virtual zero-time plant growth and service, upgraded battery life, emergency situation control and numerous performance enhancements. Selected theoretical design results have been simulated and experimentally verified using a 9 kW engineering prototype.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127804851","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}
引用次数: 2
Characteristics of an absorption refrigerator driven by fuel cell exhaust heat and used for telecommunications equipment cooling 一种由燃料电池废热驱动并用于电信设备冷却的吸收式制冷机的特性
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396654
S. Waragai, T. Uekusa, K. Oshima
{"title":"Characteristics of an absorption refrigerator driven by fuel cell exhaust heat and used for telecommunications equipment cooling","authors":"S. Waragai, T. Uekusa, K. Oshima","doi":"10.1109/INTLEC.1994.396654","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396654","url":null,"abstract":"At NTT Power and Building Facilities, an air conditioning system is being developed that uses the exhaust heat from phosphoric acid fuel cells. This paper describes the operating characteristics of an absorption refrigerator that uses two types of waste heat recovered from fuel cells for year-round operation. The design combines a single-effect and a double-effect absorption refrigerator to make effective use of two heat sources as the heat level recovered from the fuel cells varies. To ensure year-round operation, the refrigerator is designed to function at cooling water temperatures as low as 15/spl deg/C. It can also efficiently use hot water between 65 and 85/spl deg/C recovered from the fuel cell's exhaust gas. The average yearly cooling capacity of this waste-heat driven machine designed for year-round operation is 30% greater than that of conventional absorption refrigerators. This increases to 50% when the low-temperature exhaust gas from the fuel cell is also used.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124561848","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}
引用次数: 2
A novel ZVS-PWM half-bridge converter 一种新型ZVS-PWM半桥变换器
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396592
K. Harada, Y. Ishihara, T. Todaka
{"title":"A novel ZVS-PWM half-bridge converter","authors":"K. Harada, Y. Ishihara, T. Todaka","doi":"10.1109/INTLEC.1994.396592","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396592","url":null,"abstract":"A novel zero-voltage-switching (ZVS) PWM half-bridge power converter is presented. The proposed power converter consists of a conventional half-bridge power converter and two added switches in series with the secondary rectifier diodes. This power converter is controlled by PWM of the main switches using a novel switching sequence with constant switching frequency. The zero voltage switching of the main switches is maintained by partial resonance during the interval where both the main switches are off, and the secondary switches turn on and off with zero voltage and zero current. The operation of this power converter is described by use of equivalent circuits and is verified by experiments.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128932643","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}
引用次数: 4
Power equipment maintenance where are we headed? 电力设备维修我们要去哪?
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396610
A. Daileanes, J. Dicton
{"title":"Power equipment maintenance where are we headed?","authors":"A. Daileanes, J. Dicton","doi":"10.1109/INTLEC.1994.396610","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396610","url":null,"abstract":"The telecommunications industry today faces the ever growing specter of major service interruptions. One source of these outages is the very power equipment it has relied on for over a century to maintain the network. Maintenance is a major factor in power conversion equipment performance. Each manufacturer has developed detailed preventive maintenance procedures to ensure product dependability. These procedures address both the interaction of all components within the total system and the unique requirements of the individual components. The authors argue that, when selecting new equipment, preventive maintenance and repair procedures should be compared to the existing imbedded base for similarities.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"191 Suppl 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128966183","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}
引用次数: 3
The performance of VRLA batteries on solar duty VRLA蓄电池在太阳能上的性能
Proceedings of Intelec 94 Pub Date : 1994-10-30 DOI: 10.1109/INTLEC.1994.396627
J. Hawkins, L.O. Barling
{"title":"The performance of VRLA batteries on solar duty","authors":"J. Hawkins, L.O. Barling","doi":"10.1109/INTLEC.1994.396627","DOIUrl":"https://doi.org/10.1109/INTLEC.1994.396627","url":null,"abstract":"This paper reports the findings to date of a long-term real-time performance evaluation of three different types of valve-regulated Pb-acid (VRLA) batteries in remote solar-powered telecommunications installations. The results collected over the past 3 years demonstrate that the performance of selected VRLA batteries in this application compare favourably to the benchmark performance of vented cells traditionally used in solar power systems.<<ETX>>","PeriodicalId":123164,"journal":{"name":"Proceedings of Intelec 94","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115271253","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}
引用次数: 4
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