Battery charging apparatus
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Method for charging a secondary battery and charger used therefor using constant current and constant voltage Patent #: 5637981
ApplicationNo. 720619 filed on 10/02/1996
US Classes:320/117, Switchable to parallel connection320/162With detection of current or voltage amplitude
ExaminersPrimary: Wong, Peter S.
Assistant: Toatley, Gregory J. Jr.
Attorney, Agent or Firm
International ClassesH02J 007/021
Foreign Application Priority Data1995-10-04 JP
AbstractBattery charging time is shortened. The control circuit 6 controls the switches 7-1 and 7-2 to charge the batteries 21-1 and 21-2 at a constant current one by one. Subsequently the batteries are charged one by one at a constant voltage until the charging current decreases to 1/2 a prescribed current. Next, the control circuit 6 turns the switches 7-1 and 7-2 on to charge simultaneously the batteries 21-1 and 21-2 in a parallel connection. After the charging current decreases to a prescribed current value, the batteries are charged at a constant voltage for a prescribed time. Then charging is completed.