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Ultracapacitor Overvoltage Protection Circuit With Self Verification

  • US 20090190273A1
  • Filed: 03/30/2009
  • Published: 07/30/2009
  • Est. Priority Date: 10/04/2001
  • Status: Abandoned Application
First Claim
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1. A system for protecting a hybrid electric vehicle propulsion energy storage pack from an overvoltage condition, the hybrid electric vehicle propulsion energy storage pack including a plurality of energy storage cells electrically connected in series and electrically coupled with a vehicle direct current (DC) bus, the system comprising:

  • an overvoltage detection circuit configured to detect an overvoltage condition across a subset of the plurality of energy storage cells;

    a disconnect circuit configured to electrically decouple the hybrid electric vehicle propulsion energy storage pack from the DC power bus responsive to a detection of an overvoltage condition across the subset of the plurality of energy storage cells; and

    a connection verification circuits configured to verify the overvoltage detection circuits are electrically coupled to the subset of the plurality of energy storage cells.

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