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System and method for automated detection of battery insert

  • US 9,825,475 B2
  • Filed: 04/27/2012
  • Issued: 11/21/2017
  • Est. Priority Date: 04/28/2011
  • Status: Active Grant
First Claim
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1. A battery connection detection circuit disposed within a battery having connectors for connecting the battery to an equipment to be powered by the battery, for isolating the battery from the battery connectors to prevent a voltage across the connectors when the battery is not connected to the equipment, comprising:

  • a first reference voltage source and a second reference voltage source;

    a detection line driven high by the first reference voltage source;

    a comparison circuit for battery connection detection for comparing a signal from the second voltage source to a signal on the detection line, wherein an output for the comparison circuit goes low when the signal on the detection line goes low;

    a polarity independent voltage limiting circuit connected between the detection line and the comparison circuit; and

    a switch controlled by the comparison circuit for isolating the battery from the battery connectors to prevent a voltage across the connectors when the battery is not connected to the equipment, the switch has a low internal resistance.

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