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Rapid battery charger with charge controlling capability depending on overvoltage of the battery

  • US 5,905,364 A
  • Filed: 02/19/1997
  • Issued: 05/18/1999
  • Est. Priority Date: 02/20/1996
  • Status: Expired due to Fees
First Claim
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1. A rapid battery charger comprising:

  • a current source for generating a current having a level;

    a current switching circuit connected to said current source for turning the current on and off to produce current pulses occurring at a predetermined frequency, the current pulses being supplied to a battery to be recharged, each of the current pulses being on for a first duration of time and off for a second duration of time;

    timing setting means for setting a first timing and a second timing in the second duration of time of each of the current pulses, the first timing being set immediately after each of the current pulses is rendered off and the second timing being set after the first timing;

    voltage detecting means for detecting a first voltage across the battery at the first timing and a second voltage across the battery at the second timing;

    voltage differential computing means for computing a difference between the first voltage and the second voltage and outputting a voltage differential representative of the difference therebetween;

    comparison means for comparing the voltage differential output from said voltage differential computing means with a reference value and outputting a comparison output; and

    current level controlling means for changing the level of the current in response to the comparison output.

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