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This paper describes the impact of the rapidly evolving telecommunications network on power and powering arrangements, paying close attention to the confluence of telecommunications and computer systems. Fundamental features of powering strategies are addressed, including reserve energy systems, interconnect, thermal, and distributed architectures.
Size reduction of the dc-to-dc converter is most important issue in the switch-mode power supply. This paper presents general technologies and trends of high frequency switching of the dc-to-dc converter for the size reduction. Especially we discuss the problems of the magnetic amplifier as a highly reliable PWM element, when increasing the switching frequency. Then we describe the techniques of resonant...
This paper gives the basic review of the technology development of rectifiers for central power plants in telecommunications centres. The following rectifier technologies are described - transductor-controlled rectifiers with polycrystalline and monocrystalline valves; - thyristor-controlled rectifiers; - ferroresonant stabilizers and controlled ferroresonant devices; - switched mode direct-off-line...
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%.
The paper shows the advantages and disadvantages of using the latest topologies in DC/DC converter designs, up to power levels of about 300 Watt. Examples will show different way of controlling feed-back by means of high reliabilty opto-couplers and magnetics. The trends in using higher switching frequencies and the relationship with conducted and radiated noise problems will be shown, along with...
Relative merits of the conventional low-pass power filtering methods in switched-mode power conversion are compared against the integrated magnetics technique. Both theoretical results and several practical design examples clearly illustrate that low profile, high power density switching dc-to-dc converters (in excess of 20W/cubic inch) for telecommunication applications are possible even employing...
Power supply manufacturers try to make smaller and more efficient power supplies by increasing the switching frequency. Is this necessary? In all known switchmode technologies the flyback is the technology which uses the fewest number of components. By this technique it is possible to make very compact power supplies without using very high switching frequencies. This article is more written after...
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