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BATTERY CHARGING SYSTEM FOR EMERGENCY BATTERY SYSTEMS

  • US 3,784,892 A
  • Filed: 05/20/1971
  • Issued: 01/08/1974
  • Est. Priority Date: 05/20/1971
  • Status: Expired due to Term
First Claim
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1. In an emergency battery charging system adapted to be connected to and disconnected from a load and adapted to control the voltage and current delivered to a battery in said circuit from a power source, in combination, a battery, said battery being adapted to be connected to a load, battery charging means, a source of system voltage for said load, first electronic valve isolation means for blocking electrical current from said battery to said load, and means for triggering said first electronic valve isolation means into conductive state when said system voltage drops below a predetermined value, said first electronIc valve isolation means having means retaining it in conductive state until said source of system voltage reaches a predetermined value, said batttery charging means including second electronic valve means having a control element, said second electronic valve means connecting said battery charging means to said battery and logic means connected to said control element of said second electronic valve means for rendering said battery charging means inoperative when said first electronic valve isolation means is conductive.

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