Sequential timing circuitry

Details Sequential timing circuitry Sequential timing circuitry

1977-06-17

1979-03-13

Salce, Patrick R.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

307293, 361196, H01H 4714

Patent

active

041445520

ABSTRACT:
Improved sequential timing circuitry includes a relay coil, normally closed of form C relay contacts and a relay latching element, e.g., a resistor limiting relay coil current to a value intermediate pull-in and holding limit, serially connected to a high ripple D.C. source. A delay circuit selectively gates on a controlled switch to activate the relay, thereby advancing circuit operation to a next sequential task.
In accordance with varying aspects of the present invention, the circuitry of the instant invention may be employed to sequentially excite plural relays with differing delay periods, or to delay turn-on of a master relay, as in a motor control application.

REFERENCES:
patent: 3633047 (1972-01-01), Kadah et al.
patent: 3876914 (1975-04-01), Lukas
patent: 4059845 (1977-11-01), Kolkman

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