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Telecommunications Energy Conference, 2000. INTELEC. Twenty-second International

Date 10-14 Sept. 2000

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Displaying Results 1 - 25 of 122
  • INTELEC. Twenty-Second International Telecommunications Energy Conference (Cat. No.00CH37131)

    Publication Year: 2000
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    Freely Available from IEEE
  • Author index

    Publication Year: 2000, Page(s):xix - xx
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    Freely Available from IEEE
  • The development of the new type of VRLA battery for solar and wind power generation systems

    Publication Year: 2000, Page(s):90 - 93
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A tubular-type VRLA battery with granular silica has been developed. This new VRLA battery has some outstanding characteristics, such as long cycle-life, high energy efficiency or high reliability. This battery has a new electrolyte retainer, which is granular silica, filled between positive and negative plates, and also around plates. Because granular silica retainer can compress the active mass ... View full abstract»

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  • A new DC-DC converter with low current ripple characteristics

    Publication Year: 2000, Page(s):560 - 566
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    This paper presents a new converter capable of operating in high frequency, featuring high efficiency and improved circuit EMI characteristics. The main characteristic of the circuit is to work with nonpulsating input and output currents. Besides, it presents zero-voltage switching (ZVS) and active voltage clamping. Theory and experimental results taken from a 600 W, 25 kHz laboratory prototype ar... View full abstract»

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  • Development of integral-variable-structure control schemes for parallel-buck and parallel-boost DC-DC converters

    Publication Year: 2000, Page(s):82 - 89
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    In this paper we develop variable-structure control schemes for parallel-boost and parallel-buck converters. The advantages of these schemes are the simplicity in design, good dynamic response, the ability to nullify the bus-voltage error and the error between the load currents or the line currents of the converter modules under steady-state conditions, and the ability to reduce the impact of very... View full abstract»

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  • Design of power distribution to preserve and optimize specified performance

    Publication Year: 2000, Page(s):554 - 559
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    With the rapid expansion of services and network convergence, a significant part of the modern wireless and wireline networks are powered by low power (up to 500 W) or medium (15 to 250 A output current) power systems as defined by Telcordia (former Bellcore) in TR-TSY-967 and GR-947-CORE respectively. There are several parameters such as dynamic response, static regulation, ripple voltage, and no... View full abstract»

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  • Influence of capacitive load on DC/DC converters

    Publication Year: 2000, Page(s):76 - 81
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    This paper presents a new method of predicting phase margin, gain margin and bandwidth of DC/DC converters when a capacitor bank is added across the load. First, the paper summarizes previous work on the topic. Then a new method is explained and justified through experiments. The method relies on the theoretical effect of the influence of paralleled loads on the outer loop gain of DC/DC converters View full abstract»

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  • Very rapid recharging of large VRLA cells

    Publication Year: 2000, Page(s):749 - 754
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The high rate charge behavior of 2V 1000 Ah VRLA cells, subsequent to a full 12 minute rate discharge, is described. Charging rates with current equal to I10, 3I10 and 7I10 were evaluated for their influence on cell and connector temperatures and gas evolution. The result show that high rate charging, at the 3I 10 rate, can restore the UPS autonomy time ... View full abstract»

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  • A new battery plant configuration that eliminates thermal runaway in valve regulated lead-acid batteries

    Publication Year: 2000, Page(s):282 - 287
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The traditional battery plant, originally intended for use with flooded lead acid batteries, is widely used in battery plants employing valve regulated lead acid, VRLA, batteries. However use of the traditional plant can lead to thermal runaway in VRLA batteries if the plant is deployed in an uncontrolled environment. Use of temperature compensated float voltage will tend to decrease the probabili... View full abstract»

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  • A telecommunications buildings/power infrastructure in a new era of public networking

    Publication Year: 2000, Page(s):1 - 7
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The growth of data communications and the Internet and the onset of convergence following worldwide divestitures and deregulation spawned a new era in networking and increased the number of competitive carriers and service providers. The new era network will be a convergent circuit switch and packet public network (PN) that will be able to transport and process voice, video, data and Internet traf... View full abstract»

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  • Powering tomorrow's data internetworking systems

    Publication Year: 2000, Page(s):506 - 511
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The Telecoms evolution will require a number of new data internetworking equipment including high speed central processing units (CPU), digital signal processors (DSP) and high speed transmission routers and switches at 10 Gbit/s, or more, for LAN and WAN switching, Sonet and SDH systems. A mix of both fixed and mobile access network systems will be connected to this new common connectivity networ... View full abstract»

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  • The changing face of power cable

    Publication Year: 2000, Page(s):546 - 553
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1692 KB)

    Woven textile covered RHW class power cable has long been the mainstay of US telephone companies. It is rugged with good cold flow and abrasion characteristics. After nearly a century of manufacture and deployment, this genre of cable is now becoming obsolete. Textile RHW is expensive and a declining base of wire and cable manufacturers still make the product. Many modern thermoplastic insulation ... View full abstract»

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  • Possibilities of obtaining small-signal models of DC-to-DC power converters by means of system identification

    Publication Year: 2000, Page(s):65 - 75
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    This paper presents some existing system identification methods and the results obtained when applying these methods to a forward DC-to-DC power converter. Some of the advantages and disadvantages of the methods are presented. With system identification, measured data from a system's input and output can be processed to results in a model of the system View full abstract»

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  • Signal transmission characteristics of inductively loaded high-ripple DC-DC converter used in a new wire communication system

    Publication Year: 2000, Page(s):741 - 748
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    In the authors' original wire communication system having low-power DC-DC converters, a converter in the powering terminal acts as a transmitter. A signal is transmitted by the use of the output-voltage ripple as carrier wave. At transmission of a message, the ripple is intentionally increased and modulated by the signal. Steady state and transient characteristics on the ripple are investigated in... View full abstract»

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  • Rectifier design-project challenges

    Publication Year: 2000, Page(s):274 - 281
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    A telecom rectifier development process is presented from a project perspective looking at the conflicting and sometimes ambiguous requirements from a product in commercially realistic environment. An approach to mitigate the above drawbacks is presented View full abstract»

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  • VRLA battery capacity estimation using soft computing analysis of the coup de fouet region

    Publication Year: 2000, Page(s):589 - 596
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    In a previous paper (1999), the authors discussed the use of parameters found within the coup de fouet region for estimating VRLA battery capacity. However, only the operating conditions of discharge rate, and environmental temperature were considered. The investigation presented in this paper considers the influence on the coup de fouet region of other operating conditions as well as the conditio... View full abstract»

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  • Powering the New Telecoms World: a novel system topology

    Publication Year: 2000, Page(s):771 - 777
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The convergence of telecom, datacom and multimedia systems (the New Telecoms World) has slightly changed the demands on powering applications. As cost optimization is a major issue in the New Telecoms World, different power shedding levels have been introduced for different loads. These levels require disconnection/reconnection devices that shall operate autonomously independent from the mains. Th... View full abstract»

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  • The point of use DC/DC power distribution: the architecture and an implementation

    Publication Year: 2000, Page(s):498 - 505
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    This paper presents an improved DC/DC power distribution architecture for advanced telecom and computer systems. In this architecture, the power from the main DC bus is directly distributed on each plug-in electronic card via an onboard single stage power converter that produces regulated multiple output voltages. Thus, it simplifies the distribution scheme that conventionally involves multiple le... View full abstract»

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  • A low power method for compliance testing of central office high current DC power distribution plants

    Publication Year: 2000, Page(s):541 - 545
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    Testing of high current DC plants for central office applications to determine compliance with UL temperature rise limits is a challenge. if tested at rated voltage, equipment and utility power requirements are daunting. An alternate low power method for compliance testing is demonstrated for the 10 kA internal bus plant View full abstract»

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  • Design and performance of an AC/DC voltage source converter

    Publication Year: 2000, Page(s):419 - 423
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    In this paper, the single-phase boost power factor correction converter is discussed in detail. With the Fourier analysis of the general model, the low frequency model and high frequency model are proposed. From the low frequency model, the expression of the duty cycle, the boundary between continuous current mode (CCM) and discontinuous current mode (DCM), the study of the cusp distortion and the... View full abstract»

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  • Methodology for the identification of latent problems on functioning equipment

    Publication Year: 2000, Page(s):58 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The conversion equipment acquired by Telecom Italia is the object of a series of controls and checks carried out to maintain unaltered in time the quality of the services furnished. The reports of the maintenance activities constitute a valuable part of the data whose examination allows the opportune identification of the latent critical difficulties of the equipment. Next to this “tradition... View full abstract»

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  • Monolithic DC power supplies for wireless telecommunications and multimedia systems

    Publication Year: 2000, Page(s):733 - 740
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    The power supply is often the limiting factor in the portability and operating lifetime of mobile systems. Batteries and power converters are bulky and impact the weight and ergonomics of a system. The converter efficiency imposes a tradeoff between operating lifetime and the energy capacity. A substantial saving in size and weight can be obtained by investigating monolithic power supply topologie... View full abstract»

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  • Simplified single stage PFC including peak current mode control in a flyback converter

    Publication Year: 2000, Page(s):317 - 324
    Cited by:  Papers (5)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The flyback-converter is suitable for low-cost single-stage power factor correction up to 300 W. If there are requirements for very low THD, the input current needs to be controlled to follow a sine wave reference signal by an inner current feed back control loop. Peak-current-mode control can be the choice for controlling the input current to achieve low THD. This can be achieved by a proper choi... View full abstract»

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  • Synchronous rectification circuit using a current transformer

    Publication Year: 2000, Page(s):267 - 273
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    A circuit method using a current transformer is proposed as a method to drive secondary synchronous rectification in DC-DC converters. The proposed method can solve the problem of insufficient driving voltage in synchronous rectification and the problem of reverse current from load side in converters. In this paper, the circuit configuration of the synchronous rectification method using the propos... View full abstract»

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  • The changing world of power monitoring

    Publication Year: 2000, Page(s):103 - 108
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The technology of power monitoring has evolved over the last decade from simple failure notification to the delivery of data about a wide range of different conditions. Today, the number of unmanned, remote telecommunications sites has increased from ten to 100 fold. The answer to these challenges is a networked power monitoring system which can integrate and carry out a variety of power and facil... View full abstract»

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