Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88252
C. Tortora
A recently developed technology allows the use of pure lead for positive spine grids and pure copper for negative grids, straps, and terminal posts. This technology totally avoids the use of antimony, while increasing life and improving performances in connection with high rate discharges. Other advantages are higher reliability; lower manpower cost, due to automation of the process; lower total cost, compared with standard types; possibility of producing grids of larger dimensions; and elimination of casting operations for positive and negative grids, by the use of mechanical working only. The complete program of research and development is summarized which has now approached patent protection for both positive and negative grid technology. A new design for industrial traction and stationary cells, able to supply more power and more capacity for longer lifetime, has also been developed.<>
{"title":"New technology for lead acid batteries","authors":"C. Tortora","doi":"10.1109/INTLEC.1989.88252","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88252","url":null,"abstract":"A recently developed technology allows the use of pure lead for positive spine grids and pure copper for negative grids, straps, and terminal posts. This technology totally avoids the use of antimony, while increasing life and improving performances in connection with high rate discharges. Other advantages are higher reliability; lower manpower cost, due to automation of the process; lower total cost, compared with standard types; possibility of producing grids of larger dimensions; and elimination of casting operations for positive and negative grids, by the use of mechanical working only. The complete program of research and development is summarized which has now approached patent protection for both positive and negative grid technology. A new design for industrial traction and stationary cells, able to supply more power and more capacity for longer lifetime, has also been developed.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123694852","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}
Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88281
F. Piccirillo, C. Occhiena
Towards the end of the seventies, given the introduction of electronic telephone exchanges, energy plants equipped with off-line switching rectifiers were designed and put in service. The range of energy plants dedicated to telecommunication equipment constituted a complete line of unit-composed energy plants named HF 87 and having a power up to 60 kW. The authors describe the principle of these energy plants and their rectifiers, discuss their main features, and present the availability data. It is concluded that the top-level performance, high power/volume rates of modular units and the MTBF (mean time before failure) and MTTR (mean time to removal) values obtained make the energy power plants equipped with off-line switching rectifiers the best solution to the requirements of new telecommunication systems.<>
{"title":"Off-line switching rectifier for energy plant","authors":"F. Piccirillo, C. Occhiena","doi":"10.1109/INTLEC.1989.88281","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88281","url":null,"abstract":"Towards the end of the seventies, given the introduction of electronic telephone exchanges, energy plants equipped with off-line switching rectifiers were designed and put in service. The range of energy plants dedicated to telecommunication equipment constituted a complete line of unit-composed energy plants named HF 87 and having a power up to 60 kW. The authors describe the principle of these energy plants and their rectifiers, discuss their main features, and present the availability data. It is concluded that the top-level performance, high power/volume rates of modular units and the MTBF (mean time before failure) and MTTR (mean time to removal) values obtained make the energy power plants equipped with off-line switching rectifiers the best solution to the requirements of new telecommunication systems.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123215823","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}
Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88310
M. Aubree, D. Marquet
A microprocessor unit has been developed that monitors a PV power plant through the public telephone network and with a Mintel terminal; records the battery voltage, the temperature, and operation parameters; and has a mean power of about 75 mW with automatic wake-up operation mode. This device is currently operating at various sites, and the first results demonstrate its effectiveness from the technical, economical, and psychological points of view.<>
{"title":"Ultra low power telemeasurement device for small photovoltaic station","authors":"M. Aubree, D. Marquet","doi":"10.1109/INTLEC.1989.88310","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88310","url":null,"abstract":"A microprocessor unit has been developed that monitors a PV power plant through the public telephone network and with a Mintel terminal; records the battery voltage, the temperature, and operation parameters; and has a mean power of about 75 mW with automatic wake-up operation mode. This device is currently operating at various sites, and the first results demonstrate its effectiveness from the technical, economical, and psychological points of view.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124913668","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}
Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88318
F. Tsai, J. Sabate, F. Lee
The DC behavior of a constant-frequency, clamped-mode parallel-resonant converter operating above resonant frequency is characterized. The converter is shown to be able to operate with zero-voltage turn-on for all the switches from no load to full load over a wide input range. Various circuit operating modes are identified and their corresponding operating regions defined. DC characteristics for the converter design are derived. A 5 V, 50 W prototype converter operating at 104 kHz is breadboarded to show the feasibility of constant-frequency, zero-voltage-switching operation and to substantiate the analytical results. The converter is operated with zero-voltage switching from no load to full load over the entire input voltage range without any external antiparallel diodes and snubbers. The experimental results are in good agreement with the analytical predictions. An efficiency of 85% is achieved.<>
{"title":"Constant-frequency, zero-voltage-switched, clamped-mode parallel-resonant converter","authors":"F. Tsai, J. Sabate, F. Lee","doi":"10.1109/INTLEC.1989.88318","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88318","url":null,"abstract":"The DC behavior of a constant-frequency, clamped-mode parallel-resonant converter operating above resonant frequency is characterized. The converter is shown to be able to operate with zero-voltage turn-on for all the switches from no load to full load over a wide input range. Various circuit operating modes are identified and their corresponding operating regions defined. DC characteristics for the converter design are derived. A 5 V, 50 W prototype converter operating at 104 kHz is breadboarded to show the feasibility of constant-frequency, zero-voltage-switching operation and to substantiate the analytical results. The converter is operated with zero-voltage switching from no load to full load over the entire input voltage range without any external antiparallel diodes and snubbers. The experimental results are in good agreement with the analytical predictions. An efficiency of 85% is achieved.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125989437","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}
Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88316
T. Robbins
Switchmode power conversion is displacing conventional linear power conversion within Telecom Australia exchange equipment. Advances in computer-aided design software and device models have enabled the waveforms within a switchmode power supply to be accurately simulated. The author develops an accurate high-frequency power MOSFET model and demonstrates the use of simulation techniques to predict switching loss and conducted interference in switchmode power supplies.<>
{"title":"Electromagnetic interference prediction of a flyback switchmode power supply using simulation techniques","authors":"T. Robbins","doi":"10.1109/INTLEC.1989.88316","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88316","url":null,"abstract":"Switchmode power conversion is displacing conventional linear power conversion within Telecom Australia exchange equipment. Advances in computer-aided design software and device models have enabled the waveforms within a switchmode power supply to be accurately simulated. The author develops an accurate high-frequency power MOSFET model and demonstrates the use of simulation techniques to predict switching loss and conducted interference in switchmode power supplies.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126270381","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}
Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88329
D.L. Jones, D. M. Bacon
The authors describe a family of diesel engines having high specific output per unit of cylinder displacement. They briefly cover the design characteristics of the engine and discuss how computer-predicted performance compares with measured data. They also highlight the problems associated with high-output engines in connection with the application of the load and evaluate some techniques to improve the situation. It is concluded that the design concept of the 6, 8, 12, and 16 cylinder turbocharged and charge-cooled engines leads to a cost-effective and technically advanced engine that will fulfil the needs of the telecommunications industry.<>
{"title":"Standby generators for telecommunications","authors":"D.L. Jones, D. M. Bacon","doi":"10.1109/INTLEC.1989.88329","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88329","url":null,"abstract":"The authors describe a family of diesel engines having high specific output per unit of cylinder displacement. They briefly cover the design characteristics of the engine and discuss how computer-predicted performance compares with measured data. They also highlight the problems associated with high-output engines in connection with the application of the load and evaluate some techniques to improve the situation. It is concluded that the design concept of the 6, 8, 12, and 16 cylinder turbocharged and charge-cooled engines leads to a cost-effective and technically advanced engine that will fulfil the needs of the telecommunications industry.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129905787","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}
Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88299
H. Yonemori, Y. Nishida, M. Nakaoka
The authors describe a novel conceptual multistage topology of a sinewave-modulated DC-LFAC (DC-low-frequency AC) power conversion conditioning and processing system, which incorporate a phase-shifting PWM (pulsewidth modulation) series-resonant cycloinverter (inverter-coupled cycloconverter cascade circuit) with a high-frequency AC (HFAC) transformer link. Its advanced hardware of system control implementation uses instantaneous sinewave-modulated voltage regulation and compensation strategies, depending upon load disturbance and input DC voltage fluctuation, as well as an instantaneous power regenerating regulation scheme. A newly proposed breadboard using MOS-gate power transistor modules is demonstrated and experimentally tested for high-power-density AC mini-uninterruptible power supply. This series resonant cycloinconverter with HFAC link, which includes the control function of a bidirectional power flow, is evaluated as an AC power supply system for telecommunication and spacestation/aerospace energy situations in the next generation.<>
{"title":"New bidirectional sinewave-modulated series resonant power conditioning system with high-frequency AC link","authors":"H. Yonemori, Y. Nishida, M. Nakaoka","doi":"10.1109/INTLEC.1989.88299","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88299","url":null,"abstract":"The authors describe a novel conceptual multistage topology of a sinewave-modulated DC-LFAC (DC-low-frequency AC) power conversion conditioning and processing system, which incorporate a phase-shifting PWM (pulsewidth modulation) series-resonant cycloinverter (inverter-coupled cycloconverter cascade circuit) with a high-frequency AC (HFAC) transformer link. Its advanced hardware of system control implementation uses instantaneous sinewave-modulated voltage regulation and compensation strategies, depending upon load disturbance and input DC voltage fluctuation, as well as an instantaneous power regenerating regulation scheme. A newly proposed breadboard using MOS-gate power transistor modules is demonstrated and experimentally tested for high-power-density AC mini-uninterruptible power supply. This series resonant cycloinconverter with HFAC link, which includes the control function of a bidirectional power flow, is evaluated as an AC power supply system for telecommunication and spacestation/aerospace energy situations in the next generation.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129592104","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}
Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88251
G. Clerici, M. Maja, G. Mologni
A method for evaluating the parameters controlling the behavior of gas-recombining lead-acid batteries has been proposed by M. Maja and N. Penazzi, (see J. Power Sources, vol.25, no.2, p.99-109 (1989) and J. Power Sources, vol.25, no.3, p.229-38 (1989)) and tests have shown the feasibility of the procedure. The method proposed is based on the measurement of the internal pressure of a cell filled with inert gas, oxygen, and hydrogen, and maintained at open circuit or in overcharge. The authors discuss the influence of various parameters on the pressure and the composition of the gas present in the cell, maintained in various conditions (storage, floating or overcharge).<>
M. Maja和N. Penazzi提出了一种评估控制气体重组铅酸电池行为的参数的方法(见J. Power Sources, vol.25, no. 5)。2, p.99-109(1989)和J.电源，vol.25, no. 10。3，第229-38页(1989))，试验表明该程序是可行的。所提出的方法是基于测量充满惰性气体，氧气和氢气的电池的内部压力，并保持在开路或过充状态。作者讨论了各种参数对电池中存在的压力和气体组成的影响，保持在各种条件下(储存，浮动或过充)。
{"title":"Evaluation of the parameters influencing the behaviour of the gas recombining Pb-acid batteries","authors":"G. Clerici, M. Maja, G. Mologni","doi":"10.1109/INTLEC.1989.88251","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88251","url":null,"abstract":"A method for evaluating the parameters controlling the behavior of gas-recombining lead-acid batteries has been proposed by M. Maja and N. Penazzi, (see J. Power Sources, vol.25, no.2, p.99-109 (1989) and J. Power Sources, vol.25, no.3, p.229-38 (1989)) and tests have shown the feasibility of the procedure. The method proposed is based on the measurement of the internal pressure of a cell filled with inert gas, oxygen, and hydrogen, and maintained at open circuit or in overcharge. The authors discuss the influence of various parameters on the pressure and the composition of the gas present in the cell, maintained in various conditions (storage, floating or overcharge).<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"20 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129469165","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}
Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88315
A. Chibani, M. Nakaoka
A high-frequency-link AC-to-DC converter with sinusoidal input current and high-quality power factor is discussed. A bridge configuration is used for both boosting and inverting stages. Input line current is sensed and firing of the power transistors S/sub 1/ to S/sub 4/ is inhibited using a pulse-width modulation (PWM) modulator. The proposed AC-to-DC converter, which includes control circuitry for instantaneous current control implementation, is capable of providing a wide-range-regulated output direct voltage. A performance evaluation of the proposed converter was carried out theoretically and experimentally, with highly satisfactory results.<>
{"title":"New sinusoidal line-current PWM adaptive control-based HF link converter","authors":"A. Chibani, M. Nakaoka","doi":"10.1109/INTLEC.1989.88315","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88315","url":null,"abstract":"A high-frequency-link AC-to-DC converter with sinusoidal input current and high-quality power factor is discussed. A bridge configuration is used for both boosting and inverting stages. Input line current is sensed and firing of the power transistors S/sub 1/ to S/sub 4/ is inhibited using a pulse-width modulation (PWM) modulator. The proposed AC-to-DC converter, which includes control circuitry for instantaneous current control implementation, is capable of providing a wide-range-regulated output direct voltage. A performance evaluation of the proposed converter was carried out theoretically and experimentally, with highly satisfactory results.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132673304","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}
Pub Date : 1989-10-15DOI: 10.1109/INTLEC.1989.88300
K. Saches
The principles of UPS (uninterruptible power supply) design are elaborated, and the future role of rotary UPS is discussed. Rotary systems user fewer semiconductors and controls and have no need for filters due to their unique transformer. Heavily distorted loads, surge currents and fuseclearing do not cause any problems. Because of the minimum number of parts in the active electronic sections the reliability and efficiency are extremely high. The drawbacks are a higher price as well as slightly higher weight and space requirements.<>
{"title":"Dynamic or static: the role of dynamic UPS in the growing world of static systems","authors":"K. Saches","doi":"10.1109/INTLEC.1989.88300","DOIUrl":"https://doi.org/10.1109/INTLEC.1989.88300","url":null,"abstract":"The principles of UPS (uninterruptible power supply) design are elaborated, and the future role of rotary UPS is discussed. Rotary systems user fewer semiconductors and controls and have no need for filters due to their unique transformer. Heavily distorted loads, surge currents and fuseclearing do not cause any problems. Because of the minimum number of parts in the active electronic sections the reliability and efficiency are extremely high. The drawbacks are a higher price as well as slightly higher weight and space requirements.<<ETX>>","PeriodicalId":272740,"journal":{"name":"Conference Proceedings., Eleventh International Telecommunications Energy Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132067772","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}
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