Accession Number : ADD011218

Title :   Isolated Load Switching with Surge Suppression.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Bezdek,T G

Report Date : 24 Jul 1984

Pagination or Media Count : 5

Abstract : Relay contacts provide the principal switching between a D.C. power source and the load. An SCR in series with a limiting turnon to absorb the inrushing surge to capacitors of the load. Optical couplers provide isolation from a remote control. A transistor blocking oscillator is coupled between one optical coupler and the trigger of the SCR for turn on. Delay timing includes a collector-base capacitor at a transistor of the other optical coupler. A Zener diode couples the timing circuit to a transistor amplifier, which operates the relay. The turn-on circuit is then disabled. A turn-off pulse to the second optical coupler turns off the transistor amplifier, which opens the relay. (Author)

Descriptors :   *Patents, *Switching circuits, *Suppressors, *Silicon controlled rectifiers, *Electric relays, *Optical equipment, Surges, Power supplies, Transistor amplifiers, Remote control, Couplers, Resistors, Oscillators, Suppression, Direct current, Isolation, Transistors, Phase, Blocking, Limitations, Circuits, Capacitors

Subject Categories : Electrical and Electronic Equipment
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE