Abstract

The development of logistics has contributed a lot to all the branches of economy. A successful economic subject cannot exist without a well-developed logistic branch. The organization of logistics has become a strategic element of the policy making of enterprises. Modern logistics enables us to bring into line different interests in material flow management. Global organizers of logistic services are developing and specialising in some essential services, such as combining of cargo into assembly consignements and also their distribution. The biggest global tenderers of logictic services are considered (DHL, TNT, FEDEX, UPS, etc). Razvoj logistike je v veliki meri pripomogel k razcvetu vseh panog gospodarstva. Ni uspešnega gospodarskega subjekta, ki ne bi imel zelo razvito vejo logistike. V gospodarstvu postaja organiziranost logistike strateški element vodenja podjetij. Logistika torej sodi med tista področja, ki bodo pomembno vplivala na naše življenje, zato je razvoj logističnega sistema izjemnega pomena, tako za gospodarstvo kakor tudi za negospodarske dejavnosti. Torej nam sodobna logistika omogoča uskladitev različnih interesov v upravljanju materialnega toka. Razvijajo se globalni organizatorji logističnih storitev, ki se razvijejo in specializirajo na nekaj ključnih storitev, med katere spada združevanja tovora v zbirne pošiljke ter tudi sama distribucija teh pošiljk. Med največje globalne ponudnike logističnih storitev prištevamo podjetja kot so: DHL, TNT, FED EX, UPS ...

Abstract

In this paper, the performance of two types of DC-DC converters namely ?uk and Boost-Buck converters is assessed for battery charging systems. Operation with power factor correction for the input side AC current, and continuous input and output currents at the DC side of the converter are considered. The aforementioned system can be employed for many applications such as electric vehicles, data centers, etc. This paper focuses typically on data centers. Matlab/Simulink models for the two converters have been built to verify the claimed contributions. This publication was made possible by NPRP grant NPRP (10-0130-170286) from the Qatar National Research Fund (a member of Qatar Foundation). Scopu