Battery monitor for electric vehicles

  • US 5,808,469 A
  • Filed: 03/19/1997
  • Issued: 09/15/1998
  • Est. Priority Date: 01/06/1995
  • Status: Expired due to Term
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First Claim
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1. A battery monitor for monitoring a plurality of batteries, said battery monitor comprising:

  • means for providing a battery voltage signal indicative of the battery voltage of each of the plurality of batteries;

    a plurality of switches, said switches being independently selectively activated so as to provide the battery voltage signal of a particular battery of the plurality of batteries;

    controller means for selectively activating one of the switches to select a particular battery voltage signal; and

    a capacitor, said capacitor being responsive to the selected battery voltage signal from the selected one of a plurality of switches, said capacitor being charged by the selected battery voltage signal, said controller means deactivating the selected switch after the capacitor is charged by the selected battery voltage signal, said controller means being responsive to the voltage from the charged capacitor representative of the selected battery voltage signal after the selected switch is deactivated so as to determine the battery voltage of the selected battery.

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