×

Method and circuit for charging battery of portable apparatus

  • US 5,350,996 A
  • Filed: 11/09/1992
  • Issued: 09/27/1994
  • Est. Priority Date: 11/08/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A circuit arrangement for charging a rechargeable battery using a DC voltage source, comprising:

  • a first constant current source connected between said DC voltage source and said battery for producing a current of low value;

    a second constant current source connected between said DC voltage source and said battery for producing a current of high value;

    means for detecting battery voltage; and

    control means responsive to the detected battery voltage for causing said first constant current source to supply the current of low value to said battery when the voltage of said battery is lower than a reference level, causing said second constant current source to supply said current of high value to said battery for a period of time after the voltage of the battery becomes higher than said reference level, and causing said first constant current source to intermittently supply said current of low value upon termination of said period.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×