1,721,276 research outputs found
Dimenticare Milano (e le cose si precisano)
No full textIl saggio indaga la Milano di Aldo Rossi, quella dei suoi progetti non meno che quella delle architetture a lui care per svolgere una ricognizione su alcuni temi e strumenti tipici del progetto rossiano: la contaminazione, l’accumulazione, il ricordo e la loro trasposizione nell’analogo. La frequente affermazione rossiana circa la necessità di dimenticare l’architettura si declina qui nel "dimenticare Milano", cioè nel dimenticare la città a partire dalle sue architetture, per ritrovarla altrove, trasfigurata nei progetti e negli scritti non meno che nella nostalgia per quella città futura che, malgrado tutto, non può che continuare a costruirsi
Dynamic virtual test of power electronics converters
No full textThe exigency of a rapid prototyping of power converters represents an important issue for the power electronics market and pushes the designer toward the search of software tools able to depict the static and dynamic behavior of the electrical circuits. The availability of reliable analysis tools open the possibility to their use not only for the design but also for the test of the converters in circumstances not easily replicable in laboratory (f.i. possible disruptive condition like short circuit or interconnection with other not easily available systems) or for the forecast of their behavior in operating conditions far from the nominal ones. The paper discusses the methodology used for the dynamic modelization of constant frequency switching DC-DC converters. The automatic software tool, FREDOMSIM, makes use of a state space discrete time approach to provide a complete dynamic description of power cells. Examples of tests of different phase-shifted DC-DC converters, made by means of the virtual dynamic performance environment, are presented
Dynamic characterization of power converters for distributed power supply
No full textThe lasts generations of microprocessors have shown an increase in the operating frequency and, of course, in the supply characteristics. The different need of power requested made necessary new solution for the distributed power supply architectures (DPA) and claimed the use of converters suitable to meet the new high efficiency and high power exigencies. This paper is focused on the design and dynamic characterization of a DC-DC converter specifically devoted for telecom/networking/computing applications: a Switch in Line Converter (SILC). Its analysis has been obtained by means of a dedicated automatic tool, FREDOMSIM, and accomplished over its whole operating area: with different output power and load typologies (resistive, current sink and constant power). The proposed power cell exhibits a pseudo-first order dynamics, optimum for the design of an external feedback network characterized by large stability margins for all the operative conditions. Comparisons with the experimental data, given in the paper, will confirm the predictions
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