Accession Number:

ADD009702

Title:

Isolated Load Switching with Surge Suppression.

Descriptive Note:

Patent Application,

Corporate Author:

DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s):

Report Date:

1982-06-30

Pagination or Media Count:

19.0

Abstract:

Relay contacts provide the principal switching between a D.C. power source and the load. An SCR in series with a limiting resistor by phases the relay contacts during initial 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

Subject Categories:

  • Electrical and Electronic Equipment
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE