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CHARGER

  • US 20130063079A1
  • Filed: 09/07/2012
  • Published: 03/14/2013
  • Est. Priority Date: 09/12/2011
  • Status: Active Grant
First Claim
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1. A charger, comprising an output circuit unit configured to output a charging current to a secondary battery, a voltage detection unit configured to detect a voltage of the secondary battery, and a control unit configured to control the output circuit unit, whereby constant current charging, in which the charging current is flows at a constant current, and constant voltage charging, in which the charging current flows at a constant voltage after the constant current charging, are performed,wherein the control unit decreases a constant current value of the charging current by stages during the constant current charging and determines whether or not the secondary battery has deteriorated by using a first voltage drop value of the secondary battery that occurs upon first conversion in which the constant current value is converted and a second voltage drop value of the secondary battery that occurs upon second conversion in which a constant current value which is different from that of the first conversion is converted.

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