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Battery unit with an integral charge controller

  • US 6,462,514 B2
  • Filed: 06/13/2001
  • Issued: 10/08/2002
  • Est. Priority Date: 11/27/2000
  • Status: Expired due to Fees
First Claim
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1. A battery unit comprisinga storage battery coupled to an integral charge control circuit, the charge control circuit comprising a switch adapted to prevent or allow a charging current to flow into the storage battery, said switch being controlled by a measuring system that measures at least one physical parameter representative of a state of the storage battery in order to command successive opening and closing of the switch to chop said charging current if said measured physical parameter exceeds a predetermined threshold, wherein, if said predetermined threshold is exceeded, the measuring system commands the switch to chop the charging current with a first duty cycle during a predetermined time interval to homogenize the charge of the storage battery, and then to chop the charging current with a second duty cycle having a length less than a length of the first duty cycle, to establish a trickle current that compensates self-discharge of the storage battery.

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