Fail-safe energizing circuit for a functional device

Details Fail-safe energizing circuit for a functional device Fail-safe energizing circuit for a functional device

1975-09-10

1977-07-26

Cohan, Alan

Combustion

Timer, programmer, retarder or condition responsive control

Sensor of first burner controls second burner, e.g., pilot...

431 66, 431 78, 361253, F23Q 914

Patent

active

040380190

ABSTRACT:
A fail-safe energizing circuit for effecting the operation of a functional device, such as a relay, includes a resistor and a capacitor connected between outputs of an AC signal source which supplies an AC signal for charging the capacitor, a normally disabled silicon controlled rectifier connected in shunt with the capacitor and an operate coil of the relay and operable when enabled to provide a discharge path for the capacitor permitting the capacitor to discharge over the relay coil to operate the relay, and a control circuit operable to provide an enabling signal derived from the AC signal for enabling the silicon controlled rectifier. The energizing circuit is described with reference to an application in an automatic fuel ignition system for controlling the operation of a relay which energizes a fuel valve of the system.

REFERENCES:
patent: 3291183 (1966-12-01), Fairley
patent: 3510236 (1970-05-01), Potts
patent: 3583843 (1971-06-01), Hirsbunner
patent: 3644075 (1972-02-01), Squires
patent: 3734676 (1973-05-01), Wyland
patent: 3829276 (1974-08-01), Lenski
patent: 3902839 (1975-09-01), Matthews
patent: 3923445 (1975-12-01), Tyler
patent: 3938937 (1976-02-01), Matthews

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