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, the leakage current can flow in the interwinding 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 a 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.
Original language | English |
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Article number | 8281010 |
Pages (from-to) | 10467-10477 |
Number of pages | 11 |
Journal | IEEE Transactions on Power Electronics |
Volume | 33 |
Issue number | 12 |
DOIs | |
Publication status | Published - Dec 2018 |
Keywords
- Aerospace electronics
- DC-DC power converters
- leakage currents
- photovoltaic systems
ASJC Scopus subject areas
- Electrical and Electronic Engineering