×

Battery charging system

  • US 6,018,231 A
  • Filed: 01/20/1998
  • Issued: 01/25/2000
  • Est. Priority Date: 10/02/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A charging system comprising:

  • a working battery;

    a charging battery electrically coupled to the working battery to thereby charge the working battery,wherein the charging battery is coupled to the working battery with substantially no intervening current limit circuitry to limit the level of current delivered by the charging battery to the working battery, andwherein a number of cells in the charging battery is greater than a number of cells in the working battery, the series voltage of the number of cells in the charging battery being less than or equal to a maximum rated voltage of the working battery;

    a charging unit, electrically coupled to the charging battery, the charging unit converting ac current from an external ac source to dc charging current to charge the charging battery; and

    current limit circuitry that limits the level of the dc charging current produced by the charging unit.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×