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

• Current Assignee: Fumiyuki Inose, Minoru Hiroshima, Sadao Kobayashi, Shizuhisa Watanabe, Takahiko Tanigami, Takashiro Iwasaki
• Original Assignee: Fumiyuki Inose, Minoru Hiroshima, Sadao Kobayashi, Shizuhisa Watanabe, Takahiko Tanigami, Takashiro Iwasaki
• Inventors: Hiroshima, Minoru, Inose, Fumiyuki, Kobayashi, Sadao, Iwasaki, Takashiro, Watanabe, Shizuhisa, Tanigami, Takahiko
• Primary Examiner(s): Goldberg, Gerald
• Application Number:
  US05/267,359
• Time in Patent Office: 411 Days
• Field of Search: 320/1 307/64,67,71,109,146,1R 321/15,20,47 323/7,8,17
• US Class Current: 307/10.1
• CPC Class Codes: B60R 21/017 including arrangements for providing electric power to safety arrangements or their actuating means, e.g. to pyrotechnic fuses or electro-mechanic valves
• CPC Class Codes: B60R 21/0173 Diagnostic or recording means therefor
• CPC Class Codes: H02J 9/06 with automatic change-over , e.g. UPS systems

Abstract

Herein disclosed is an improved d-c power supply system which comprises a d-c power source, a first rectifier serially connected to the power source, and series connection composed of a protective resistor and a back-up capacitor, the series connection being connected across the first rectifier and the power source, and the protective resistor being bypassed by a second rectifier so that a discharge current from the back-up capacitor flows through the second rectifier. The power supply system further comprises means for producing information signals representing condition of the back-up capacitor.

Claims

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.

2. An electric power supply system as claimed in claim 1, in which said means includes a first output terminal connected to the output terminal of said first comparator, a second output terminal, a first NAND gate having an output terminal connected to said second output terminal and one input terminal connected to said output terminal of the first comparator, a second NAND gate having an output terminal connected to the other input terminal of said first NAND gate, one input terminal connected to the output terminal of said second comparator and the other input terminal connected to said output terminal of the first NAND gate.