Method of monitoring the internal impedance of an accumulator battery in an uninterruptible power supply, and an uninterruptible power supply

  • US 5,457,377 A
  • Filed: 09/17/1993
  • Issued: 10/10/1995
  • Est. Priority Date: 10/01/1992
  • Status: Expired due to Term
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First Claim
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1. A method of monitoring internal impedance of an accumulator battery in an uninterruptible power supply, said method comprising the steps of:

  • determining a load current IL induced by a load connected to said battery and passing through said battery during discharge of said battery to said load;

    measuring a corresponding AC voltage component UR obtained on a battery voltage UBATT ;

    calculating a value of internal impedance ZB of said battery using said load current IL and said AC voltage component UR ;

    comparing said internal impedance value ZB with a predetermined reference value Zmax ; and

    determining a condition of said battery in accordance with a result of said comparing step.

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