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Battery-powered device

  • US 4,835,453 A
  • Filed: 11/16/1987
  • Issued: 05/30/1989
  • Est. Priority Date: 07/07/1987
  • Status: Expired due to Fees
First Claim
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1. A device comprising:

  • a rechargeable battery connectable to a load for energizing said load,a power-supply circuit for charging the battery and/or energizing the load,first detection means for detecting the expiration of a discharge time of the battery when the battery is connected to the load,a discharger for discharging the battery when the battery is disconnected from the load after detection of said expiration of said discharge time,second detection means for detecting a battery voltage substantially equal to a voltage threshold value,first time-measurement means for measuring a first time interval during which the battery is connected to the load after detection of said expiration of said discharge time and until detection of the voltage threshold value,second time-measurement means for measuring a second time interval during which the discharger is operative and the battery is disconnected from the load after detection of said expiration of said discharge time and until detection of the voltage threshold value, andcorrection means for correcting said discharge time depending on the weighted sum of said first time interval and said second time interval as measured by the first and the second time-measurement means and relative to a reference value.

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