Maurizio Passoni

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In this paper, a high switching frequency buck converter using insulated gate bipolar transistors (IGBTs) is presented. This was done by using an auxiliary branch made of an IGBT of the same type as the one used for the main switch and saturable inductors. The proposed topology allows both switches to be fully soft switched to keep the efficiency high over(More)
In this work the design and optimization of a DC/DC half-bridge converter with a coreless PCB transformer and high insulation voltage is presented. The analysis starts by computing coreless transformer magnetic parameters (i.e. auto and mutual inductance of the coils) through a simple Matlab/sup /spl reg// function. The procedure is applicable to both(More)
A PWM DC/DC buck converter with a soft-switching network using saturable inductors is presented. The circuit has soft-switching transition over a wide load range, with low electromagnetic emission and high efficiency. This paper presents its operating principle together with the relations for complete converter design. The design was applied to an IGBT(More)
OBJECTIVE To analyze the feasibility of using continuous positive airway pressure (CPAP) delivered via a modified helmet to treat children with hypoxemic acute respiratory failure. DESIGN A single-center, prospective, clinical study. SETTING Pediatric intensive care unit in a university hospital. PATIENTS Fifteen consecutive children (from 1 month to(More)
BACKGROUND Effective indicators of the early graft failure after pediatric liver transplantation are currently a crucial question. The aim of this study was to analyze retrospectively laboratory parameters that may help anticipate an early graft loss (GL). METHODS The 131 pediatric liver transplantations, performed in our hospital from January 2002 to(More)
Biliary atresia (BA) represents the most frequent indication for liver transplantation (OLTX) in the pediatric population. The aim of this paper was to present a series collected over the last 7 years from October 1997 through July 2004, including 260 pediatric OLTX in 231 patients. BA was the indication in 137 patients. There were 69 boys and 68 girls of(More)
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