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Hybrid electric propulsion system and method

  • US 7,866,425 B2
  • Filed: 06/28/2004
  • Issued: 01/11/2011
  • Est. Priority Date: 06/28/2004
  • Status: Active Grant
First Claim
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1. A hybrid propulsion system, comprising:

  • a first DC link;

    a first energy storage unit coupled across the first DC link and operable to supply power to operate at least one traction drive motor;

    a second DC link coupled electrically downstream of the first DC link;

    a second energy storage unit coupled across the second DC link and electrically coupled to the traction drive motor;

    a conversion circuit coupled between the first and second DC links and configured to cause a different voltage level on the first and second DC links;

    an auxiliary power unit coupled to the first DC link and operable to charge the first energy storage unit; and

    a control system operable to control operation of the auxiliary power unit to maintain a desired voltage across the first DC link and to control power flow through conversion circuit;

    wherein the first energy storage unit and the first DC link are only coupled to the traction motor through the second DC link.

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