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Battery pack monitoring system

  • US 5,912,548 A
  • Filed: 04/09/1998
  • Issued: 06/15/1999
  • Est. Priority Date: 07/30/1996
  • Status: Expired due to Fees
First Claim
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1. An electronic device for monitoring operating conditions of a portable rechargeable power supply in a housing, said electronic device comprising:

  • a monitor for monitoring the temperature of the rechargeable power supply;

    a determiner coupled to the rechargeable power supply, said determiner including an analog-to-digital converter for determining the potential level of the power supply;

    said analog-to-digital converter including a potentiometer having an input for receiving a reference potential and an output for outputting a selected reduced potential dependent upon the reference potential and further dependent upon the resistance value of said potentiometer;

    said analog-to-digital converter further including a comparator having an output and first and second inputs, said first input being coupled to said potentiometer to receive the selected reduced potential outputted by said potentiometer, and said second input being connected to said rechargeable power supply, said comparator for comparing the output of said potentiometer with the potential of said rechargeable power supply;

    said determiner further including a successive approximation register coupled between said potentiometer and said output of said comparator, said successive approximation register for controlling the resistance value of said potentiometer in response to said output of said comparator;

    an interface for outputting information corresponding to the potential level of the rechargeable power supply determined by said determiner and further for outputting information corresponding to the temperature monitored by said monitor; and

    a regulator coupled to the rechargeable power supply, said monitor, said interface and said determiner, said regulator for supplying regulated operating power from said rechargeable power supply to each of said monitor, said determiner, and said interface.

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