Isolated load switching with surge suppression

Details Isolated load switching with surge suppression Isolated load switching with surge suppression

1982-06-30

1984-07-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307252J, 307252M, 323325, H03K 1700, H01J 4014

Patent

active

044619553

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.

REFERENCES:
patent: 3302629 (1967-02-01), Shano
patent: 3421488 (1969-01-01), Tarter
patent: 3622837 (1971-11-01), Gellman
patent: 3793537 (1974-02-01), Stringer
patent: 4097770 (1978-06-01), Fisher
patent: 4129785 (1978-12-01), Kadah
patent: 4143287 (1979-03-01), Biggs

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