Electronic delay turn off switch

Details Electronic delay turn off switch Electronic delay turn off switch

1994-06-06

1996-06-25

Wysocki, Jonathan

Electrical transmission or interconnection systems

Switching systems

Switch actuation

315199, 315360, H01H 700

Patent

active

055303013

ABSTRACT:
An electronic delay turn off switch including a bridgelike array of four diodes disposed between an alternating current power source and a load wherein the diodes have anodes and cathodes in opposing disposition and having an SCR with anode connected to the interconnected cathodes and with cathode connected to the interconnected anodes. A gate isolation diode, a switch, a resistor-capacitor charge mode timer, and a DIAC are interconnected between the SCR anode and gate thereby providing an SCR turn on whenever the switch contacts are closed, and a delayed SCR turn off whenever the switch contacts are opened. In an alternate embodiment a variable resistor is added to enable user selection of the duration of turn off delay.

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patent: 4775801 (1988-10-01), Baum
patent: 4912376 (1990-03-01), Strick
patent: 5051607 (1991-09-01), Dalton
patent: 5258656 (1993-11-01), Pawlick

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