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High Ratio Non‐Isolated DC–DC Converter for Hydrogen Battery Using a 50 kW PEM Fuel Cell
Author(s) -
Videau N.,
Fontes G.,
Flumian D.,
Gateau G.,
Meynard T.,
da Silva J. L.,
Verdu O.
Publication year - 2017
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201600071
Subject(s) - boost converter , forward converter , flyback converter , inductor , ćuk converter , materials science , power density , energy conversion efficiency , voltage , ripple , electrical engineering , buck–boost converter , power (physics) , optoelectronics , physics , engineering , quantum mechanics
This paper proposes a DC–DC converter dedicated to high efficiency and high voltage conversion ratio, which is well suited for fuel cell applications. At high voltage conversion ratio the proposed converter, named here mirror boost converter, has a better ratio of active/freewheeling times which, compared with conventional structures, reduces the penalty on efficiency induced by the high conversion ratio. This converter also uses eight interleaved coupled‐inductors, which reduces the current and voltage ripple and makes possible to use of smaller passive components. Coupling all phases with an inter‐cell transformer (ICT) also improves the power density, volume and losses of the magnetic component compared to separate inductors. A comparison with a classical double boost converter is realized using the same material. The proposed converter reaches a peak efficiency of 96.5% at 17 kW and 95.3% at 42 kW for a voltage conversion ratio around 10. The mirror boost converter has about half the losses of the double boost converter at same fuel cell power and delivers 69% more power at the maximum measured current phase.