A PV-Inspired Low-Common-Mode Dual-Active-Bridge Converter for Aerospace Applications

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Abstract
In the framework of the More Electric Aircraft, the use of isolated DC/DC power conversion for the electrical power distribution system is one of the most investigated solutions. If the DC/DC converter produces a variable common-mode voltage, leakage current can flow in the inter-winding parasitic capacitance of the high-frequency transformer, leading to insulation deterioration and early failure. This paper proposes to use modified H-bridge structures, already employed in the photovoltaic system for DC/AC power converters, to enable constant common-mode voltage for isolated DC/DC converters. The analysis shows that this solution can achieve the same efficiency as the conventional one, while simulations and experiments show a strong reduction of the common-mode current flowing through the transformer. A reliability analysis showed that the lifetime of the high-frequency transformer can be extended with the proposed solution.
Funding Information
  • Ningbo Science and Technology Beauro (2013A31012, 2014A35007)
  • European Union/Interreg V-A Germany–Denmark
  • European Research Council
  • European Union's Seventh Framework Program (FP/2007-2013/ERC, 616344-HEART)
  • European Union's Seventh Framework Program (FP/2007-2013)

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