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BATTERY MONITORING APPARATUS AND WIRELESS FIELD DEVICE

  • US 20130289908A1
  • Filed: 04/25/2013
  • Published: 10/31/2013
  • Est. Priority Date: 04/25/2012
  • Status: Active Grant
First Claim
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1. A battery monitoring apparatus to be built in a device in which a primary battery is used as a driving power source, comprising:

  • a voltage measuring module configured to obtain an open circuit voltage of the primary battery and an output voltage of the primary battery at the time when a load current flows;

    a current measuring module configured to obtain the load current of the primary battery;

    a first resistance value calculating module configured to obtain a first internal resistance of the primary battery on the basis of the open circuit voltage, the load current and the output voltage;

    a second resistance value calculating module configured to obtain a second internal resistance of the primary battery at which the device can operate normally on the basis of the open circuit voltage, the load current and a minimum drive voltage inherent in the device; and

    an alarm outputting module configured to output a battery life alarm when the first internal resistance is larger than the second internal resistance.

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