Battery charging system having logarithmic analog-to-digital converter with automatic scaling of analog signal

  • US 5,449,997 A
  • Filed: 01/24/1994
  • Issued: 09/12/1995
  • Est. Priority Date: 05/30/1991
  • Status: Expired due to Term
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First Claim
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1. A method of charging a battery selected from a group of batteries having a range of substantially different battery voltage ratings, including at least a first range and a second range, substantially greater than said first range comprising:

  • applying a charging current to said battery;

    monitoring the voltage of said battery by sampling at discrete time intervals to obtain a plurality of instantaneous voltage readings;

    converting said instantaneous voltage readings into corresponding digital values so that a given percentage difference in voltage readings within either of said first or second ranges is represented by substantially the same difference in said corresponding digital values;

    using at least one of said digital values as a control parameter to determine when to terminate the applying of charging current to said battery.

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