{"title":"Application of the Unified Topological Modelling Method to Switching Converters in Current-Programmed Mode","authors":"A. Pietkiewicz, D. Tollik","doi":"10.1109/INTLEC.1987.4794561","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794561","url":null,"abstract":"In the paper the unified topological small-signal modelling method is extended to switching dc-dc converters in current-programmed mode. The method leads to the unified analytic expressions for parameters of the Y-type model and allows easy inclusion of the mutual inductances, damping networks and parasitic effects. As a result the method offers a simple to use modelling procedure especially efficient for more complex converter structures. Usefulness of the proposed modelling technique is illustrated using the coupled-inductor Up converter example.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123904021","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":"Ring Signal Generation in Axe","authors":"Mats Barkell","doi":"10.1109/INTLEC.1987.4794569","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794569","url":null,"abstract":"In the telephone exchange system AXE, ring signal generation is distributed to the line interface magazines, each supplying ring signal to one Line and Switch Module (LSM) of 128 subscriber lines. This paper discusses the system aspects which led to this configuration and also some technical details of the internal design of the ring signal generators.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124269302","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":"Operational Parameters of SLA Batteries in Standby Applications","authors":"G. Baudo, D. Calasanzio, M. Grossoni","doi":"10.1109/INTLEC.1987.4794538","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794538","url":null,"abstract":"The purpose of this paper is to quickly examine the operating characteristics of the Monolite valve regulated sealed Lead-acid batteries manufactured by FIAMM, to provide the potential user with the minimum information necessary to access the potential advantages of installing and utilizing these batteries in standby applications requiring an absolute minimum maintenance in a variety of environments.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127206746","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":"Supervision and Control System for Power and Environmental Equipment at the NHK Broadcasting Center","authors":"Hideo Nagasawa, Jun Sato, Y. Endo","doi":"10.1109/INTLEC.1987.4794588","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794588","url":null,"abstract":"This paper describes a supervision and control system for power and environmental equipment at the NHK (Japan Broadcasting Corporation) Broadcasting Center. This system is a building management system, combining both the functions of power and environmental equipment organically. It is a computer-control system, intended for improved total performance, including improvement of equipment operation reliability and maintenance efficiency.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129986913","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 Small Packaged DC Power Plant","authors":"W. Miller, P. Paradissis, M. MacDonald","doi":"10.1109/INTLEC.1987.4794622","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794622","url":null,"abstract":"A complete 24 VDC, 50 A power plant for telecommunication applications is described which fits in 10¿ inches (6 rack positions) in a 19 inch relay rack. Among the meter, alarm and control functions provided are a switch selectable digital meter to monitor battery and load voltage and current, a low voltage disconnect control, and a battery charging control to protect the gel cell batteries. Up to three 25A power supply modules can be plugged into the system for full redundancy at a 50A 1 oad, The power supplies incorporate a 200 kHz switching technology for minimum size and high efficiency. The parameters of the power module, the power system and design philosophy as well as the reliability of the system will be described.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132420353","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}
J. Nishizawa, T. Tamamushi, T. Koga, S. Sugawara, H. Hayashi, H. Sekimoto
{"title":"20kHz, 5kW Class of the Static Induction Thyristor Type High Frequency-Link DC-to-DC Converter","authors":"J. Nishizawa, T. Tamamushi, T. Koga, S. Sugawara, H. Hayashi, H. Sekimoto","doi":"10.1109/INTLEC.1987.4794528","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794528","url":null,"abstract":"A 5kW, high frequency link DC to DC converter has been developed using a single SI (Static Induction) thyristor with a self cooling heat-pipe radiator fin as well as a 20kHz carrier frequency, thus assuring a DC to final output efficiency of 90%.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126642564","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":"Closed Loop Programmable Power a Smart House Innovation","authors":"J. Edgar","doi":"10.1109/INTLEC.1987.4794581","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794581","url":null,"abstract":"The concept of closed loop programmable power is a spin-off of research work that is being spearheaded by the National Association of Home Builders in the United States in conjunction with the development of Smart House - a home of the future that combines the centralized microprocessor control of building systems and household appliances with the unified distribution of power and communications. Development work associated with the various technical aspects of Smart House is being carried out under the umbrella of the National Cooperative Research Act of the United States. This act was introduced in 1984 to allow American companies to pool their resources in the interest of advancing research and development without the fear of violating American Anti-Trust Legislation.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123350547","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":"New Single-Phase UPS Converter","authors":"H. Scheibengraf, W. Steffen","doi":"10.1109/INTLEC.1987.4794604","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794604","url":null,"abstract":"In the course of current technological progress, the power ratings of minicomputer systems which require an uninterruptible power supply have been generally decreasing. At the same time, the computing capacity of the units has greatly increased. Consequently the demand for computer-aided systems for development, design, manufacturing and management has risen enormously, even for applications in smaller and middle-sized companies. In addition, microprocessor systems (whose power ratings are inherently small) are being increasingly applied for process control and monitoring in industrial plants. Most of these small units are decentrally located, and hence are most advantageously supplied by separate, independent power systems. The ratings of these units lie in the range of about 1 kVA to 10 kVA. In response to this development in demand, a new series of single-phase UPS systems is being offered, with ratings of 3, 5, and 10 kVA. These units are characterized by maximum operating reliability, simple design, and very fast output voltage regulation. In addition, the inverter is insensitive to the highly distorted load currents which are typical of computer power supplies having non-linear characteristics. The new UPS systems also have a low noise level, so that they can be conveniently installed in offices, even next to the computer. Modern, rational manufacturing methods are used, and consequently this high quality equipment can be offered at reasonable prices. Fig. 1 shows a 5 kVA-UPS.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126622464","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":"An Investigation of the Lead-Acid Negative Tafel Break","authors":"W. Brecht","doi":"10.1109/INTLEC.1987.4794536","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794536","url":null,"abstract":"In the transition from antimonial to the lead-calcium alloy system in the U.S. stationary battery market, it was observed that the calcium suffers inherently wider voltage variation within a battery string than would be expected due to variability in cell purity levels. The opening discussion relates to the base for the Tafel presentation of electrode polarization behavior. The work of Willihnganz is reviewed in relation to the Tafel, particularly as positive float polarization levels affect corrosion life. The negative Tafel break is considered and its contribution to the bi-modal voltage distribution observed in calcium battery strings. The problem of insufficient positive polarization following start of float operation is discussed and depicted graphically. Experimental work conducted to discover the mechanisms at play in the float operation of the lead acid cell which cause the negative Tafel break are discussed. The discovery of the relationship between buoyancy and negative polarization from the beam cell experiment is considered. The experiments to operate the cell without the presence of the normal oxygen from the positive and the impact of this on negative tafel behavior are discussed. Based on the experimental data, the hypothesis for hydrogen shielding of the negative is reached and proven experimentally. Data characterizing tafel break behavior and its fundamental instability are discussed in light of the hydrogen shielding mechanism, resulting in the prediction of the observed bi-modal voltage distribution in full strings of batteries.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124976115","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":"Current and Future Power Supply Techniques for Telecommunications Systems","authors":"J. Girard","doi":"10.1109/INTLEC.1987.4794565","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794565","url":null,"abstract":"","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125016817","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}