Thomas George Bezdek
Engineers at Robin Crst Ln, Littleton, CO
License number
Colorado 19637
Issued Date
Jul 16, 1982
Renew Date
Aug 1, 2006
Expiration Date
Jul 31, 2008
Type
Professional Engineer
Address
Address
10 Robincrest Ln, Littleton, CO 80123
Professional information
Isolated Load Switching With Surge Suppression
US Patent:
4461955, Jul 24, 1984
Filed:
Jun 30, 1982
Appl. No.:
6/394039
Inventors:
Thomas G. Bezdek - Littleton CO
Assignee:
The United States of America as represented by the Secretary of the Air
Force - Washington DC
Force - Washington DC
International Classification:
H03K 1700, H01J 4014
US Classification:
250551
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 passes 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.