Vital electronic time delay circuit

Details Vital electronic time delay circuit Vital electronic time delay circuit

1979-12-26

1982-04-13

Salce, Patrick R.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361156, 361198, 361203, 246 63C, H01H 4700, B61L 2106

Patent

active

043251013

ABSTRACT:
A fail-safe electronic time delay circuit for providing a predetermined time delay period having an emitter-follower amplifier connectable to a source of recurrent signals, a voltage doubling rectifier for rectifying the amplified recurrent signals and for charging a capacitor which powers a tickler coil transistor oscillator, a pair of complementary switching transistors which are alternately rendered conductive by the a.c. oscillations of the transistor oscillator, a rectifier having a capacitor which is charged when one of the pair of complementary switching transistors is conductive and which is discharged through a vital relay when the other of the pair of complementary switching transistors is rendered conductive.

REFERENCES:
patent: 3287608 (1966-11-01), Pikrant
patent: 3407340 (1968-10-01), Hufnagel
patent: 3694702 (1972-09-01), Popp
patent: 3832599 (1974-08-01), Grundy
patent: 4012645 (1977-03-01), Moorey
patent: 4044272 (1977-08-01), Darrow
patent: 4059845 (1977-11-01), Kolkman
patent: 4150417 (1979-04-01), Darrow et al.

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