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In modern traction drives the transformer causes a high amount of the overall losses. A transformer with lower losses however increases the THD of the output current and the amplitude of the fault current. Two converters will be presented which make the utilization of an enhanced transformer possible.
Energy efficiency requirements of PV-inverter and UPS can be reached through multi-level IGBT topologies. A 3-level T-type topology utilizing dedicated 650V and 1200V IGBT and free-wheeling Diode chips (FwDi) and low inductance module construction are essential to create a performing IGBT module for these applications.
Efficiency of high power Uninterruptible Power Supplies (UPS) is a fundamental criterion regarding the permanent use of such a device. A state of the art on soft-switching over constraint of the UPS application has been made. The principle of Auxiliary Resonant Commutated Pole (ARCP) using autotransformer has been identified as the most interesting way to increase efficiency or switching frequency...
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