Isolated DC to DC Converter for Railway Applications
This paper provides an analysis of a three phase dual active bridge (DAB) topology used as high-power-density dc-dc converter for railway applications. The three-phase DAB is analyzed concerning the current intervals, the outputpower and soft-switching region, including the impact of zero-voltage switching (ZVS) capacitors.
Furthermore, two measures are proposed to achieve soft-switching in the entire operating range, being auxiliary inductors and a straightforward switching strategy called the burst mode. Optimal component values are calculated to minimize losses in the complete operating range and to assess which measure is best suited. A prototype with the specifications acquired from the application has been built, yielding an efficiency of 95:6% at a nominal output power of 80kW
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