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ABNORMAL BATTERY DEPLETION DETECTION IN AN IMPLANTABLE DEVICE

  • US 20090182517A1
  • Filed: 11/24/2008
  • Published: 07/16/2009
  • Est. Priority Date: 12/13/2007
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a coulometer configured to measure battery capacity;

    a capacity-by-voltage device configured to use a sensed battery voltage to measure battery capacity;

    a controller, coupled to the coulometer and the capacity-by-voltage device, the controller configured to combine the measurements from the coulometer and the capacity-by-voltage device, using a weighted average to determine battery capacity consumed; and

    wherein the controller is configured to detect a drop in the sensed battery voltage below a specified threshold to identify a high-current depletion fault, the specified threshold determined as a function of battery capacity consumed as computed using the weighted average.

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