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Battery-discharge-protection system for electronic accessories used in vehicles containing a battery

  • US 5,929,604 A
  • Filed: 06/18/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 06/18/1997
  • Status: Expired due to Term
First Claim
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1. A battery discharge protection system for a mobile telecommunications device powered by a battery, comprising:

  • a) a power supply line connecting the telecommunications device to the battery;

    b) a control unit for monitoring the current consumed by said telecommunications device, said control unit including;

    i) an accessory current sensor for determining the current consumed by said telecommunications device in discrete intervals of time;

    ii) an accumulator for summing the current consumed by said telecommunications devices over a plurality of said time intervals to obtain a cumulative total of the current consumed;

    iii) means for generating a control signal when said total current consumed as indicated by said cumulative total reaches a threshold;

    c) a power switch disposed in said power supply line between the battery and the telecommunications device and operatively connected to said control unit, wherein said power switch is responsive to said control signal from said control unit to interrupt power to said telecommunications device.

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