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Current monitoring circuit for secondary battery

  • US 6,335,611 B1
  • Filed: 07/26/2000
  • Issued: 01/01/2002
  • Est. Priority Date: 07/30/1999
  • Status: Expired due to Fees
First Claim
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1. A current monitoring circuit for a secondary battery, comprising:

  • a current detector detecting a current during a charging and a discharging of a secondary battery, and outputting a voltage signal according to a detected current;

    an amplifier having an amplification degree that can be changed, and amplifying the voltage signal output from the current detector at a suitable amplification degree obtained by changing the amplification degree;

    an A/D converter converting an output of the amplifier into a digital signal; and

    a numerical-value converter converting the digital signal output from the A/D converter according to an amplification degree of the amplifier, to thereby output a digital value indicating the current during the charging and the discharging of the secondary battery.

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