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Battery charging device, method for charging battery pack by switching between maximum charging voltage and maximum charging current

  • US 5,905,362 A
  • Filed: 04/28/1998
  • Issued: 05/18/1999
  • Est. Priority Date: 04/05/1996
  • Status: Expired due to Term
First Claim
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1. A battery charging device for charging a battery pack having a battery cell, said battery pack being capable of storing information indicative of a maximum charging voltage of the battery cell and being capable of communicating said information, said battery charging device comprising:

  • communication means for receiving said information indicative of the maximum charging voltage of the battery cell transmitted from said battery pack;

    a variable current source for supplying an output current;

    a variable voltage source for supplying an output voltage; and

    control means for controlling said variable voltage source and variable current source to supply said output voltage and current upon charging of said battery pack so as not to exceed said maximum charging voltage and said maximum charging current, said control means controlling said variable voltage source and variable current source to switch between a constant-current charge using said maximum charging current and a constant-voltage charge using said maximum charging voltage.

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