Proceedings of INTELEC 95. 17th International Telecommunications Energy Conference

Oct. 29 1995-Nov. 1 1995

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  • Proceedings of INTELEC 95. 17th International Telecommunications Energy Conference

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (889 KB)
    Freely Available from IEEE
  • Author index

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (115 KB)
    Freely Available from IEEE
  • Open loop control of a unity power factor, discontinuous conduction mode boost rectifier

    Publication Year: 1995, Page(s):671 - 677
    Cited by:  Papers (34)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (483 KB)

    The boost rectifier, when operated in discontinuous conduction mode and constant duty ratio, has a power factor less than unity, which approaches unity at the expense of high conversion ratios. The proposed control scheme corrects this problem by providing unity power factor, even for low conversion ratios, in an open loop fashion at constant switching frequency. View full abstract»

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  • Synchronous rectifier for low voltage switching converter

    Publication Year: 1995, Page(s):471 - 475
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    A new self-driven MOSFET synchronous rectifier in a forward converter is presented. This topology is realized by adding only a few components to the conventional synchronous rectifier. MOSFETs are driven by the optimum waveforms and the operation is very simple. High efficiency has been achieved in an actual circuit. The efficiency is improved about 1.5% (5 V, 10 A) by the new configuration compar... View full abstract»

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  • Active filter using cascade connection of switching regulators

    Publication Year: 1995, Page(s):678 - 683
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The stability of cascade connected switched mode power converters is investigated. The first stage is the boost power converter for correcting power factor and the second stage is the buck power converter for regulating output voltage. In this paper, the authors show that increasing the feedforward gain of the first stage makes the second stage more stable and that good regulation is achieved by i... View full abstract»

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  • The thermal behaviour of VRLA/AGM cells and monoblocs

    Publication Year: 1995, Page(s):353 - 359
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1208 KB)

    Valve-regulated Pb-acid/glass mat (VRLA/AGM) secondary cells and monoblocs were investigated concerning parameters influencing the onset of thermal runaway conditions. For this purpose, 2 V 1000 Ah and 2 V 300A h cells were specially assembled so as to include electrolyte starvation conditions similar to service life dryout. Key cell performance parameters determined experimentally indicate that a... View full abstract»

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  • Three phase sinusoidal current absorption AC-DC converter for a high power supply for telecommunication

    Publication Year: 1995, Page(s):715 - 720
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The paper deals with a high power supply used for telecommunication devices. It proposes a two stages converter topology including a three phase sinusoidal current absorption rectifier and a DC-DC resonant converter. The control problems are discussed and the expected performances are studied to fulfil the standards by means of a numerical simulation View full abstract»

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  • Piezoelectric transformer converter with frequency control

    Publication Year: 1995, Page(s):175 - 180
    Cited by:  Papers (24)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    An efficient piezoelectric transformer (PT) power converter with frequency control is presented. The optimum-designed reactance components are able to keep power efficiency high while controlling the output voltage for some load variation. An implemented PT power converter with frequency control achieves an efficiency higher than 75% at Vo=5 V, Io=0.5-2 A, and switching frequ... View full abstract»

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  • Power quality testing regarding to international standards

    Publication Year: 1995, Page(s):531 - 538
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    Power quality is becoming more and more important. Numerous power supplies, power converters, UPCs, etc. are used. Different events like voltage dropouts, voltage variations and harmonics have to be taken into account. The author explains the origin of the various types of interference, and the importance, limits and application of the different standards concerned with power quality View full abstract»

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  • A versatile 48 V/60 V 100 A rectifier for all mains inputs

    Publication Year: 1995, Page(s):466 - 470
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    This paper describes an innovative high frequency rectifier showing unique characteristics. The rectifier uses the patented double full-bridge topology. Each converter is based on a ZVS (zero voltage switching) full-bridge topology and the phase shift modulation. This quasi-resonant mode combines the advantages of the resonant topologies and the PWM converters. The circuit operates at 200 kHz and ... View full abstract»

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  • Cooling a modern network at minimal cost

    Publication Year: 1995, Page(s):243 - 251
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    The paper outlines BT's approach to economic cooling of its telecommunications network equipment and details how changes in operational philosophy have been reflected in the more efficient operation of existing cooling plant. With more than 1600 small exchanges now cooled by fresh air alone (no refrigeration plant), the development of a new cooling system capable of extending this principle to muc... View full abstract»

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  • The water-cooled heavy-current power supply units

    Publication Year: 1995, Page(s):397 - 400
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Heavy-current power supply units with 400 A and 800 A load currents and 2 V and 5 V output voltages are presented. The general power consumption of a computer is 100 kW. Both in computer assemblies and in power supply units, water cooling is used. During computer power supply development, the following principal problems are solved: minimal power supply components and assembly losses for optimal e... View full abstract»

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  • Magnetic coupled power and data transferring system with a detachable transformer

    Publication Year: 1995, Page(s):330 - 334
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A noncontact power and data transferring system using a detachable transformer with magnetic coupling is proposed. This transferring system is suitable for a computer reference system such as a patient's chart because a connector and a battery for the charts become useless by using the proposed system. In this system, switching noise and switching loss are suppressed by a soft-switching technology View full abstract»

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  • The characteristics evolving from various VRLA battery designs

    Publication Year: 1995, Page(s):346 - 352
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    A review of valve-regulated Pb-acid (VRLA) battery Intelec papers 1982-1994 has identified four main areas of interest: developments; performance; theory; and operations. Development and operations are linked together insofar as operations describes the performance of batteries designed from developed VRLA products. Improvements in battery design and system operation are identified to minimise the... View full abstract»

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  • A telecommunication rectifier with improved efficiency and ease of manufacture

    Publication Year: 1995, Page(s):710 - 714
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The Cellular and Personal Communication Service industries are demanding compact, light weight, and reliable telecommunications equipment. New zoning constraints require smaller buildings placing base station volume at a premium. The rapid deployment of equipment makes ease of manufacturing essential to decrease production lead times. Our response to these trends is a 3000 watt rectifier with 91% ... View full abstract»

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  • Small sized power supply module with SMT control circuit HIC and synchronous rectifier

    Publication Year: 1995, Page(s):167 - 174
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    This paper introduces the development of a low-cost small sized power supply module with a high-density SMT control circuit and a low-loss synchronous rectifier. The control circuit consists of a high-density SMT hybrid IC. As well as stabilizing the output voltage, the control circuit suppresses the rush current, monitors the input voltage, shuts down the power supply in the event of a power fail... View full abstract»

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  • Customer care in the market for telecom energy systems

    Publication Year: 1995, Page(s):526 - 530
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    All customers in any type of business or industry are most likely in agreement that they are to be “cared for” by their suppliers. The same message is preached in virtually all teachings about enterprise and marketing that “customer care” is a cornerstone of success. But how do we define customer care? Who is the customer and what type of care do customers actually want? Th... View full abstract»

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  • A unity power factor low EMI battery charger for telecommunication applications

    Publication Year: 1995, Page(s):458 - 465
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Low conducted EMI and unity power factor are important criteria for battery chargers in telecommunication applications. The conventional hard switching boost pre-regulator which is added to improve the power factor of DC power supplies used as battery chargers, often aggregates the conducted EMI emissions of power supplies. A large number of unity power factor topologies have been investigated, as... View full abstract»

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  • Higher-harmonic distortion canceller using a switching amplifier with minimum output power

    Publication Year: 1995, Page(s):235 - 242
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A new feedforward-controlled higher-harmonic distortion canceller is presented in this paper. The input currents of electronic apparatus or industrial machines are pulsatile and contain many higher harmonic components, because capacitor-input smoothing circuits, phase-controlled rectifiers and so on are utilized. These higher-harmonic currents distort the line voltage waveform, and influence the e... View full abstract»

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  • Modeling and simulation of power distribution systems for hybrid fiber/coax networks

    Publication Year: 1995, Page(s):622 - 626
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    This paper presents the simulation and modelling of a low-frequency AC distribution power system for hybrid optical fiber/coaxial cable telecommunication architecture. The objective is to study the powering requirement and the maximum loading capability of the network. The modeling of the distribution cables and the constant-power load are discussed. The voltage distribution of the network under v... View full abstract»

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  • Powering telephony on coax networks-a teletraffic perspective

    Publication Year: 1995, Page(s):207 - 211
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Various architectures are under consideration for future telephony networks. Some of these involve placing equipment with traffic dependant power consumption into the customer access network. Two options are available for powering this equipment: design to meet the maximum possible load, or design for a lesser load and accept the failures which occur when powering limits are exceeded. Due to the l... View full abstract»

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  • Telecool Aero-a tailor-made cooling system for small telephone exchanges and containers

    Publication Year: 1995, Page(s):394 - 396
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The idea of developing a small, compact cooling unit for cooling containers and small buildings, using a new technology for these applications known as cooling with displacement air flow, was born in February 1993 at Ericsson Components. The intention was for the cooling unit to be tailor-made to meet the strict requirements in respect of the indoor climate for telecommunications equipment, to pos... View full abstract»

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  • An efficient and economical active AC line conditioner

    Publication Year: 1995, Page(s):664 - 670
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    To improve the quality of a power system, a family of active AC line conditioners (ALCs) have been developed and built. These circuits are simple, robust and economically competitive to available systems. Voltage waveform correction is intrinsically available. The paper presents theoretical analysis of the systems confirmed by laboratory test results derived from 50 Hz as well as 400 Hz equipment.... View full abstract»

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  • A multiple switch high-voltage DC-DC converter

    Publication Year: 1995, Page(s):322 - 329
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    A high-voltage DC-DC power converter with multiple series-connected devices is proposed. Series connection of power devices has evolved into a mature technique and is widely applied in HVDC systems. Static and dynamic voltage balance is ensured by shunting individual devices with (dissipative) snubbers. The snubber losses become pronounced for increased operating frequencies and adversely affect p... View full abstract»

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  • New developments in batteries for fiber-in-the-loop applications

    Publication Year: 1995, Page(s):690 - 696
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1052 KB)

    The rapid deployment of power in uncontrolled environments and unusual installation configurations for fiber-in-the-loop applications is posing new challenges to battery and battery system designers. Battery string voltages and discharge rates are also higher than in traditional telecommunications applications. Battery materials and designs must be chosen to withstand extreme temperatures, and man... View full abstract»

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