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ELECTRIC POWER SUPPLY SYSTEM USING BACK-UP CAPACITOR

  • US 3,753,001 A
  • Filed: 06/29/1972
  • Issued: 08/14/1973
  • Est. Priority Date: 06/30/1971
  • Status: Expired due to Term
First Claim
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1. An electric power supply system comprising:

  • a d-c power source;

    a first rectifier serially connected to said power source so as to permit a current to flow through said power source in only one direction from the negative to positive terminals of said power source;

    a pair of output terminals connected across said rectifier and said power source, said output terminals being connected to a load;

    a first series connection composed of a first protective resistor and a back-up capacitor, connected across said output terminals, said resistor being bypassed by a second rectifier so that a discharge current from said capacitor flows through said second rectifier;

    a first discharging resistor bypassing said back-up capacitor so as to slowly discharge said back-up capacitor;

    a second series connection composed of a second protective resistor and a reference charge-storing capacitor, connected across said first rectifier and said power source, said reference charge-storing capacitor being bypassed by a second discharging resistor;

    a voltage divider composed of first and second voltage dividing resistors, connected acrosss said first rectifier and power source so as to produce a reference voltage;

    a first comparator for producing a logic '"'"''"'"''"'"''"'"'1'"'"''"'"''"'"''"'"' signal when a voltage across said back-up capacitor exceeds said reference voltage;

    a second comparator for producing a logic '"'"''"'"''"'"''"'"'1'"'"''"'"''"'"''"'"' signal when a voltage across said reference charge-storing capacitor; and

    means for producing information signals representing condition of said back-up capacitor in dependence on said logic '"'"''"'"''"'"''"'"'1'"'"''"'"''"'"''"'"' signals from said first and second comparators.

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