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A new circuit topology is presented which makes possible and safe the series connection of devices in very high voltage switching applications. This circuit behaves like a flyback converter and assures the uniform distribution of the voltage among the devices of the series. Within the proposed topology the active devices are hard switched. By means of this(More)
IGBT series-connected power switching circuit is presented. Voltage balance on IGBT's is ensured by means of a simple auxiliary circuit applied directly on the high power inverter used in hard switching applications. Analysis in terms of dissipated energy, collector overvoltage and switching frequencies, comparing performances of a single high voltage IGBT(More)
The supply catenary lines for electric vehicles, and specifically for urban streetcars, may be subject to a series of discontinuities which could determine the power switch-off of the traction converter, due to protections intervention. The proposed system, based on a two-quadrant DC/DC converter, a supercapacitors bank and a suitable control system, can(More)
With reference to light railways transportation systems, in the paper a comparison is carried out between vehicles equipped with either Induction Motor Drive or Permanent Magnet Brushless Motor Drive. The attention is particularly focused on energetic performance, in term of losses and efficiency. The main characteristics of the traction units of the two(More)
Coupled measurement-simulation procedure for very high power fast recovery – soft behavior diode design and testing " , Microelectronics Reliability, Thermo-mechanical simulation of a multichip press-packed IGBT " , Finite element design of water heat sinks for press-pack IGBTs " , Proc. A new silicon resistor technology for very high power snubbers " ,(More)
The driving improvement in terms of IGBT switching losses reduction is accompanied by a significant increase of EMC noise problems. In this paper, the authors focused their attention on the electromagnetic noise radiated by the high voltage high power IGBT modules during the inductive turn-on. The noise variation and the dependence of each IGBT commutation(More)
A high-efficiency high-frequency link inverter design with bi-directional power flow, using a zero-voltage-switching (ZVS) technique is proposed. The considered configuration includes a HF full-bridge inverter, a HF transformer, a 3-phase cycloconverter; Required bidirectional switches have been composed by anti-series IGBT connection. Main advantages of(More)
Relationship between choices of power semiconductor devices and converter topologies are discussed, for multisystem locos. Advantages of dual-stage converter, associated to press-pack 4.5 kV IGBT are presented. Ansaldobreda phase-assembly for heavy railway is presented, as well as performances of power converter of E403 loco
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