117,476 research outputs found
La Gloriosissimi Geminiani Vita di Giovanni Maria Parente. Edizione critica a cura di Anna Spiazzi
No full textIl contributo propone l’edizione critica del prosimetro di Giovanni Maria Parente Gloriosissimi Geminiani Vita corredato da undici silografie: il testo è contenuto in un incunabolo uscito a Modena l’11 marzo 1495 presso lo stampatore Domenico Rococciola. L’incunabolo, che si conserva presso la Biblioteca Estense di Modena con segnatura α. J. 7. 9 (1), rappresenta uno dei rari esemplari superstiti della tiratura del 1495. L’opera si configura come la più ampia attestazione narrativa in volgare di un interesse verso la storia e il culto di san Geminiano, vescovo di Modena nel IV secolo. Analizzandone il contesto storico-letterio, culturale e linguistico, si riconosce nella Gloriosissimi Geminiani Vita del Parente un testo di produzione locale a carattere popolare, che attinge alle forme e ai generi letterari della tradizione del Trecento e del Quattrocento, uno strumento di devozione rivolto in particolare agli illitterati, anche per l’alternarsi delle immagini alla prosa e ai versi
Clamped-resonant interleaved boost converter: Analysis and design
No full textThis paper presents the detailed analysis and design of a soft-switching DC-DC converter called clamped-resonant interleaved boost converter (CRIB). This topology, thanks to a resonant L-C tank connected between the drain terminals of the switches of two interleaved boost cells, achieves zero-voltage and zero current commutations of all devices, independently of the load current, with a reduced dv/dt across the switches, making the converter suitable for high-frequency operation. Moreover, a proper no-load operation is proved, whenever the minimum voltage gain is higher than a given threshold. Differently from previous works on current-fed resonant converters, the presented theoretical analysis includes the effect of the input filter inductors, allowing to derive a simple design procedure to meet the given specifications. According to the outlined design steps, an experimental prototype was built, rated at 42~54 V to 400 V~300 W. Measurements confirm the theoretical predictions, showing an efficiency above 96% at the nominal power in the whole input voltage range. Finally, the possibility to reduce the overall magnetic volume by coupling the two input inductors is demonstrated
Applying Coupled Inductors to the Clamped-Resonant Interleaved Boost Converter
No full textThis paper investigates the possibility to use coupled inductors in the DC-DC converter topology called Clamped-Resonant Interleaved Boost converter (CRIB). Such topology employs a resonant L-C tank connected between the switch drain terminals to achieve zero-voltage turn-on and turn-off of both switches, as well as zero-current turn-off for the rectifier diodes, independently of the load current. Moreover, no-load operation is demonstrated providing the voltage gain is higher than a minimum value. The converter analysis and proposed design criteria were verified by an experimental prototype rated at 42 - 54 V to 400 V - 300 W, showing a very good efficiency in the whole input voltage range. Performance comparison with the same topology adopting separated input inductors is included as well
A Fast On-state Voltage Measurement Circuit for Power Devices Characterization
No full textThe precise measurement of the on-state voltage of power devices working in real operating conditions is the key for their characterization as well as health monitoring. This letter proposes a new on-state voltage measurement circuit featuring very high bandwidth and accuracy. An auxiliary circuitry allows to decouple the measurement system reference potential from the noisy device-under-test environment. DC, AC, and dynamic performance have been validated from measurements on a prototype
Ruprecht Potsch, Frammenti dell' antico Fluegelaltar della chiesa di S.M.Nascente di Pieve di Cadore
No full textA Line-Frequency Commutated Rectifier Complying with IEC 1000-3-2 Standard
No full textConsumer and household appliances require cheap AC/DC power supplies complying with EMC standards. The commonly employed passive solutions are bulky and do not provide output voltage stabilization. Active solutions, based on PFCs with high-frequency switching, provide compactness and regulation capability, but are generally expensive due to the need for fast-recovery diodes and complex EMI filters. This paper presents a high power factor rectifier, based on a modified conventional rectifier with passive L-C filter, which improves both the harmonic content of the input current and the power factor, by means of a low frequency commutated switch and a small line-frequency transformer, and allows compliance with IEC 1000-3-2 standard with reduced overall inductive components' volume
Conducted EMI issues in a Boost PFC design
No full textThe paper presents the results of an experimental activity concerned with the development of a 600 W Boost Power Factor Corrector (PFC) complying with the EMC standards for conducted EMI in the 150 kHz-30 MHz range. In order to accomplish this task, different circuit design and layout solutions are taken into account and their effect on the conducted EMI behavior of the converter is experimentally evaluated. Common-mode and differential-mode switching noise, together with input filters' design and topology and with the PCB layout (in terms of track length and spacing, ground and shielding planes etc.) are the key aspects which have been analyzed. In particular, the paper reports the conducted EMI measurements for different filter capacitor placements and values, for different power switch drive circuits together with several other provisions which have turned out to be decisive in the reduction of the generated EMI
A Low-Inductance Line-Frequency Commutated Rectifier Complying with EN 61000-3-2 Standards
No full textThe paper deals with line-frequency commutated rectifiers, providing compliance with IEC 1000-3-2 standards with a reduced overall reactive component size as compared to conventional rectifiers with passive L-C filters. Based on a previously presented high quality rectifier, different topological modifications are studied with the attempt to reduce the magnetic component volume and/or to improve rectifier performances. The low switching frequency accounts for reduction of losses and of electromagnetic noise emission as compared to high switching frequency rectifiers. Moreover, the switches operation results in a boost action, which compensates for the filter inductor voltage drop, thus providing output voltage stabilization against load variations
aiuto di A. Haller,Scultura lignea raffigurante Madonna addolorata (sec. XVI),Selva di Cadore, chiesa di Santa Fosca
No full textcatalogo della mostra A nord di Venezi
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