Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794554
J. Klaassens
Electronic power converters operating with a high-frequency link are receiving an increasing amount of attention. A forced interruption in current in the semiconductor switches will lead to excessive momentary values of the power compared to the conduction losses for the current conduction interval, which must be dissipated in these switching elements. The switching losses are the fundamental reason for the increase in the total losses in the semiconductor switches for an increased repetition frequency of the switches. The development of the theory presented here and the technology of electronic power converters with high internal frequencies is based on the special properties of resonant circuits in switching networks. In general, such a converter consists of a series-resonant circuit. excited by a number of electronically controlled (semiconductor) switches. This resonant circuit is inserted in the direct path of the energy transfer of the power converter. The (quasi) sinusoidal currents in the semiconductor switches allow the current conducted through the switch to be interrupted at the zero crossing and, when combined with the limited value for the rate of rise of the current after turn-on and before turn-off, the switching losses can be reduced to a minimum. It is then possible to increase the above-mentioned barrier for the maximum pulse frequency up to hundreds of kHz. The energy can be emanated from a source (single or polyphase voltage source generating unipolar or bipolar waveforms) and is transmitted to a network (load) in a specific form (unipolar or bipolar, single or polyphase voltage waveforms).
{"title":"Power Conditioning with a Switched Series-Resonant Circuit Operating at a High Internal Frequency","authors":"J. Klaassens","doi":"10.1109/INTLEC.1987.4794554","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794554","url":null,"abstract":"Electronic power converters operating with a high-frequency link are receiving an increasing amount of attention. A forced interruption in current in the semiconductor switches will lead to excessive momentary values of the power compared to the conduction losses for the current conduction interval, which must be dissipated in these switching elements. The switching losses are the fundamental reason for the increase in the total losses in the semiconductor switches for an increased repetition frequency of the switches. The development of the theory presented here and the technology of electronic power converters with high internal frequencies is based on the special properties of resonant circuits in switching networks. In general, such a converter consists of a series-resonant circuit. excited by a number of electronically controlled (semiconductor) switches. This resonant circuit is inserted in the direct path of the energy transfer of the power converter. The (quasi) sinusoidal currents in the semiconductor switches allow the current conducted through the switch to be interrupted at the zero crossing and, when combined with the limited value for the rate of rise of the current after turn-on and before turn-off, the switching losses can be reduced to a minimum. It is then possible to increase the above-mentioned barrier for the maximum pulse frequency up to hundreds of kHz. The energy can be emanated from a source (single or polyphase voltage source generating unipolar or bipolar waveforms) and is transmitted to a network (load) in a specific form (unipolar or bipolar, single or polyphase voltage waveforms).","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"7 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":"115507610","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 : 1987-06-14DOI: 10.1109/INTLEC.1987.4794591
P. Rajala
The generating set department of Valmet Linnavuori Works, Finland, has during the last four years developed a new series of diesel generating sets, called Series V, in the output range of 30 to 180 kVA. The innovation came as a result of the development work, for which Valmet has taken out a patent and a protection of designs in many countries. The customer gets the real benefit of the new innovation. The total costs compared with those of traditional, noise-attenuated standby power plant solutions are about a quarter less. The basic planning criteria were small size and easy installation. The small size was achieved by installing the engine above the generator and by replacing the relay control by a programmable logic. The power from engine to generator is transmitted by the toothed belt which at the same time gives the possibility to drive the engine at higher speed than in the direct coupling. This means that more power can be taken from the engine, which also makes the size of the whole plant smal1er. The easy installation was achieved by packaging all the parts on a single base frame. The shape of the machine was chosen so that the whole machine will go in through a standard-sized fire door, whose frame is built into the outer wall of the future machinery room. The machine is hauled in through this door, and the opening is covered with a ventilation louvre delivered along with the machine.
{"title":"New Concept to Build Standby Power Plants","authors":"P. Rajala","doi":"10.1109/INTLEC.1987.4794591","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794591","url":null,"abstract":"The generating set department of Valmet Linnavuori Works, Finland, has during the last four years developed a new series of diesel generating sets, called Series V, in the output range of 30 to 180 kVA. The innovation came as a result of the development work, for which Valmet has taken out a patent and a protection of designs in many countries. The customer gets the real benefit of the new innovation. The total costs compared with those of traditional, noise-attenuated standby power plant solutions are about a quarter less. The basic planning criteria were small size and easy installation. The small size was achieved by installing the engine above the generator and by replacing the relay control by a programmable logic. The power from engine to generator is transmitted by the toothed belt which at the same time gives the possibility to drive the engine at higher speed than in the direct coupling. This means that more power can be taken from the engine, which also makes the size of the whole plant smal1er. The easy installation was achieved by packaging all the parts on a single base frame. The shape of the machine was chosen so that the whole machine will go in through a standard-sized fire door, whose frame is built into the outer wall of the future machinery room. The machine is hauled in through this door, and the opening is covered with a ventilation louvre delivered along with the machine.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"10 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":"128867753","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 : 1987-06-14DOI: 10.1109/INTLEC.1987.4794632
Harald Probst
Satety of telecommunication equipment and systems are going to become internationally standardized. Because of the far reaching interconnections via telecommunication networks, safety is a most important factor in designing and constructing telecommunication equipment and systems. In the past safety standardisation of telecommunication was a national task mostly adressed by the telecom administrations. Today, because of the ongoing merging of telecommunication and computer technology and of the opening of the telecom market, safety aspects of these technologies are gaining more and more international attention. In this paper the main rules on safety especially valid in the telecommunication section will be shown with respect to the internationally standardized pilot functions on safety, and their relation to practically gained experience on telecommunication equipment and systems concerning currents and voltages used at accessible parts. Last not least, international activities on that subject including pending investiqations on advanced technologies, e.g. numerously used SMPS or new telecom systems drifting apart into subscribers premises, as well as new requirements and test methods based on these technologies are mentioned.
{"title":"International Safety Standardisation of Telecommunication Equipment and Systems","authors":"Harald Probst","doi":"10.1109/INTLEC.1987.4794632","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794632","url":null,"abstract":"Satety of telecommunication equipment and systems are going to become internationally standardized. Because of the far reaching interconnections via telecommunication networks, safety is a most important factor in designing and constructing telecommunication equipment and systems. In the past safety standardisation of telecommunication was a national task mostly adressed by the telecom administrations. Today, because of the ongoing merging of telecommunication and computer technology and of the opening of the telecom market, safety aspects of these technologies are gaining more and more international attention. In this paper the main rules on safety especially valid in the telecommunication section will be shown with respect to the internationally standardized pilot functions on safety, and their relation to practically gained experience on telecommunication equipment and systems concerning currents and voltages used at accessible parts. Last not least, international activities on that subject including pending investiqations on advanced technologies, e.g. numerously used SMPS or new telecom systems drifting apart into subscribers premises, as well as new requirements and test methods based on these technologies are mentioned.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"12 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":"125271803","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 : 1987-06-14DOI: 10.1109/INTLEC.1987.4794534
Georges Manolikakis
The major technical difficulty of this system is the feasibility of a DC-DC converter featuring the characteristics of the titLe The idea of this kind of isolator comes from the author and Mr. J. BLIN, Engineer at CNET Lannion (France). CNE¶ Lannion found that this idea should be further explored and entrusted us with the study (by the end of 1985) of, first, the converter and then of a complete isolator.
{"title":"DC-DC Converter with High Input to Output Isolation and Very Low Standby Consumption for Telephone Teleprinter or Other Long Lines Total Isolation Application","authors":"Georges Manolikakis","doi":"10.1109/INTLEC.1987.4794534","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794534","url":null,"abstract":"The major technical difficulty of this system is the feasibility of a DC-DC converter featuring the characteristics of the titLe The idea of this kind of isolator comes from the author and Mr. J. BLIN, Engineer at CNET Lannion (France). CNE¶ Lannion found that this idea should be further explored and entrusted us with the study (by the end of 1985) of, first, the converter and then of a complete isolator.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"4 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":"128298299","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 : 1987-06-14DOI: 10.1109/INTLEC.1987.4794556
M. Nakaoka, S. Maniwa, T. Maruhashi, H. Omori
This paper presents the softwares and hardwares for a new switched-mode DC-DC converter circuit which incorporates a single symmetrical PWM control-based voltage-fed series resonant high-frequency inverter as a sub-system for the internal power conversion and processing stage. In the first place, it refers to a novel circuit topology of the series resonant type high-frequency inverter linked DC-DC converter and its control implementation system, followed by the operating principle and unique features. In the second place, it develops the computer-aided analytical algorithm theory for the presented circuit, making it widely applicable, by introducing various characteristic circuit parameters and control variables, and at the same time, quantitatively explains the circuit behavior by use of the computer simulation results. In the third place, it describes the open-loop operating regulation chara cteristics in steady-state operation on the basis of circuit parameters and control variables. Finally, it demonstrates the test power converter circuit using the latest bipolar type FET (IGT) power modules and makes the comparison between the experimental and theoretical results.
{"title":"A New High-Frequency Resonant PWM Inverter-Linked DC-DC Converter Utilizing Bi-Mos Power Devices and its Performance Evaluations","authors":"M. Nakaoka, S. Maniwa, T. Maruhashi, H. Omori","doi":"10.1109/INTLEC.1987.4794556","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794556","url":null,"abstract":"This paper presents the softwares and hardwares for a new switched-mode DC-DC converter circuit which incorporates a single symmetrical PWM control-based voltage-fed series resonant high-frequency inverter as a sub-system for the internal power conversion and processing stage. In the first place, it refers to a novel circuit topology of the series resonant type high-frequency inverter linked DC-DC converter and its control implementation system, followed by the operating principle and unique features. In the second place, it develops the computer-aided analytical algorithm theory for the presented circuit, making it widely applicable, by introducing various characteristic circuit parameters and control variables, and at the same time, quantitatively explains the circuit behavior by use of the computer simulation results. In the third place, it describes the open-loop operating regulation chara cteristics in steady-state operation on the basis of circuit parameters and control variables. Finally, it demonstrates the test power converter circuit using the latest bipolar type FET (IGT) power modules and makes the comparison between the experimental and theoretical results.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"114 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":"128377672","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 : 1987-06-14DOI: 10.1109/INTLEC.1987.4794532
J. Warembourg
In the field of power conversion for telecommunication equipment, ISDN involves various problems. One of them is to achieve the required efficiency of the DC/DC converter used to supply low power terminals such as digital telephones connected to the "S" bus. SAT has developped such a converter to equip digital telephone terminals designed for RENAN (the French experimental digital network). To fulfil the requirement of high efficiency in a wide range of output power and specially at very low output power, this converter works in two different modes : - free running frequency with fixed pulse-width for low power output corresponding to the stand by state of the terminal - fixed frequency PWM for higher output power corresponding to active states of the terminal. The control circuitry is achieved by simple low cost low power components.
{"title":"A DC/DC Converter for ISDN Terminals","authors":"J. Warembourg","doi":"10.1109/INTLEC.1987.4794532","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794532","url":null,"abstract":"In the field of power conversion for telecommunication equipment, ISDN involves various problems. One of them is to achieve the required efficiency of the DC/DC converter used to supply low power terminals such as digital telephones connected to the \"S\" bus. SAT has developped such a converter to equip digital telephone terminals designed for RENAN (the French experimental digital network). To fulfil the requirement of high efficiency in a wide range of output power and specially at very low output power, this converter works in two different modes : - free running frequency with fixed pulse-width for low power output corresponding to the stand by state of the terminal - fixed frequency PWM for higher output power corresponding to active states of the terminal. The control circuitry is achieved by simple low cost low power components.","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":"124690747","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 : 1987-06-14DOI: 10.1109/INTLEC.1987.4794597
N. Backman, Sifu Elektronik
A buck-type converter is modeled for continuos conduction mode, simulated, analysed and measured with emphasis on loop gain to be able to design for stability. As a result of this "Structured Analog Design" process, a new SPICE2 model for current-mode programming plus a useful formula for control voltage to output voltage transfer function has been derived. The theoretical background is based on Dr. R. D. Middlebrooks papers on the subject, (2,3). In a case study, both prediction and measurement show a second pole, in loop gain, at a surprisingly low frequency. This implies that the current-mode control, although it seems to be the best method for regulation, must be properly understood for avoiding oscillating units.
针对连续导通模式，建立了buck型变换器模型，并对其进行了仿真、分析和测量，重点对回路增益进行了分析和测量，以便进行稳定性设计。由于这种“结构化模拟设计”的过程，一个新的SPICE2模型的电流模式编程加上一个有用的公式控制电压输出电压传递函数已被导出。理论背景是基于Dr. R. D. Middlebrooks关于这个主题的论文，(2,3)。在一个案例研究中，预测和测量都显示了第二极，环路增益，在惊人的低频率。这意味着，虽然电流模式控制似乎是最好的调节方法，但必须正确理解以避免振荡单元。
{"title":"Spice-Modelling, Analysis and Measurement of a Current Programmed DC-DC Regulator","authors":"N. Backman, Sifu Elektronik","doi":"10.1109/INTLEC.1987.4794597","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794597","url":null,"abstract":"A buck-type converter is modeled for continuos conduction mode, simulated, analysed and measured with emphasis on loop gain to be able to design for stability. As a result of this \"Structured Analog Design\" process, a new SPICE2 model for current-mode programming plus a useful formula for control voltage to output voltage transfer function has been derived. The theoretical background is based on Dr. R. D. Middlebrooks papers on the subject, (2,3). In a case study, both prediction and measurement show a second pole, in loop gain, at a surprisingly low frequency. This implies that the current-mode control, although it seems to be the best method for regulation, must be properly understood for avoiding oscillating units.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"49 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":"121416449","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 : 1987-06-14DOI: 10.1109/INTLEC.1987.4794587
H. Green
Electrical Power Systems (EPS) are essential subsystems in space systems. Either new or increased requirements in the frame of current projects influence design and technology for power generation. conditioning, distribution and energy storage. This paper, though, does not deal with these topics but with another new requirement, i.e. the introduction of intelligent controllers into the subsystem. Based on the EPS design for the European space station the paper discusses the subsystem architecture with respect to data management and topological aspects leading to a bus concept for internal data transmission. Furthermore, functional requirements for the on-board subsystem software are explained and topics like redundancy, built-in-test-equipment (BITE) and future use of expert systems are addressed.
{"title":"Data Management in Electrical Power Systems for Space Applications","authors":"H. Green","doi":"10.1109/INTLEC.1987.4794587","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794587","url":null,"abstract":"Electrical Power Systems (EPS) are essential subsystems in space systems. Either new or increased requirements in the frame of current projects influence design and technology for power generation. conditioning, distribution and energy storage. This paper, though, does not deal with these topics but with another new requirement, i.e. the introduction of intelligent controllers into the subsystem. Based on the EPS design for the European space station the paper discusses the subsystem architecture with respect to data management and topological aspects leading to a bus concept for internal data transmission. Furthermore, functional requirements for the on-board subsystem software are explained and topics like redundancy, built-in-test-equipment (BITE) and future use of expert systems are addressed.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"09 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":"130847012","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 : 1987-06-14DOI: 10.1109/INTLEC.1987.4794540
R. P. Bullough, W. Edwards, A. Harrison
Some high temperature tests have been undertaken on the Chloride Powersafe product, to see if the technique could be used to predict product life. When the results of the tests were applied to the Arrhenius equation the subsequent plots gave inconsistant predictions and, in one case the prediction was wrong in that the value was less than actual service. Therefore, single mode failure criterea, essential for the application of the Arrhenius equation, may not be true for this type of product. In conclusion proposals are made that could improve the reproducability of the data, and observations are made that indentify the possibility that more than one reaction is involved in the life determining step of the product.
{"title":"Stationary Valve Regulated Sealed Lead-Acid Batteries can the Arrhenius Equation be used to Predict Product Life","authors":"R. P. Bullough, W. Edwards, A. Harrison","doi":"10.1109/INTLEC.1987.4794540","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794540","url":null,"abstract":"Some high temperature tests have been undertaken on the Chloride Powersafe product, to see if the technique could be used to predict product life. When the results of the tests were applied to the Arrhenius equation the subsequent plots gave inconsistant predictions and, in one case the prediction was wrong in that the value was less than actual service. Therefore, single mode failure criterea, essential for the application of the Arrhenius equation, may not be true for this type of product. In conclusion proposals are made that could improve the reproducability of the data, and observations are made that indentify the possibility that more than one reaction is involved in the life determining step of the product.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"57 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":"130349918","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 : 1987-06-14DOI: 10.1109/INTLEC.1987.4794624
G. Musil, Friedrich Schuller
A power-feeding system developed for digital signal-transmission systems on optical fibers is presented. It consists of 1 to 3 power-feeding units (400 mA, 700 V each), a power-feeding control unit, the power-feeding cable and the remotely-fed converters to supply the loads. The power-feeding control unit performs a route test before the power-feeding is switched on, locates route faults and monitors the entire power-feeding system during operation. The converters, series-connected in the power-feeding circuit, each have two mutually isolated outputs rated 60 V/25 W. The outputs of one or more converters can be connected in parallel. The reach of the system is determined, apart from the maximum available power-feeding voltage, only by the resistance of the cable used and the power-requirement of the equipment to be fed. Several hundred kilometers can be spanned. The modular structure of the power-feeding system allows to fulfi11 various requirements in regard to system architecture, power, redundancy and economic efforts. As well as fiber-optic systems, other loads in the power range of approximately 10 to 200 W can be supplied.
{"title":"A Flexible, Modular Power-Feeding System for Digital Optical Waveguide Transmission","authors":"G. Musil, Friedrich Schuller","doi":"10.1109/INTLEC.1987.4794624","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794624","url":null,"abstract":"A power-feeding system developed for digital signal-transmission systems on optical fibers is presented. It consists of 1 to 3 power-feeding units (400 mA, 700 V each), a power-feeding control unit, the power-feeding cable and the remotely-fed converters to supply the loads. The power-feeding control unit performs a route test before the power-feeding is switched on, locates route faults and monitors the entire power-feeding system during operation. The converters, series-connected in the power-feeding circuit, each have two mutually isolated outputs rated 60 V/25 W. The outputs of one or more converters can be connected in parallel. The reach of the system is determined, apart from the maximum available power-feeding voltage, only by the resistance of the cable used and the power-requirement of the equipment to be fed. Several hundred kilometers can be spanned. The modular structure of the power-feeding system allows to fulfi11 various requirements in regard to system architecture, power, redundancy and economic efforts. As well as fiber-optic systems, other loads in the power range of approximately 10 to 200 W can be supplied.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"49 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":"133821755","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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