Solenoid operated remote resetting device with a protective acti

Details Solenoid operated remote resetting device with a protective acti Solenoid operated remote resetting device with a protective acti

1997-10-31

1999-04-13

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

307140, H01H 4732

Patent

active

058943986

ABSTRACT:
A solenoid operated remote resetting device with a protective solenoid activation circuit is disclosed. The solenoid activation circuit includes circuitry for protecting the solenoid from overheating due to intentional or unintentional prolonged current flow in the solenoid. The solenoid activation circuit receives an activation signal, in the form of an alternating current signal, from a remote activation means. The activation signal is coupled to a rectifier in the solenoid activation circuit that provides rectified DC power for the solenoid activation circuit. A solenoid power circuit is also coupled to the rectifier input such that the AC signal from the activation means can be rectified and passed to the solenoid positive DC signal. A timing circuit coupled between the rectifier output and the solenoid power circuit provides an active phase of a predetermined time and a blocking phase after each application of the activation signal. The solenoid power circuit provides power to the solenoid only during the active phase. The blocking phase prevents any continuing signal from the activating means from reaching the solenoid after the active phase has been completed. Termination of the activation signal resets the active phase for the next application of the activation signal.

REFERENCES:
patent: 3215864 (1965-11-01), Doyle et al.
patent: 3577040 (1971-05-01), Campbell
patent: 4449161 (1984-05-01), Kling
patent: 4500938 (1985-02-01), Dulin
patent: 4642726 (1987-02-01), Matsko et al.
patent: 5486972 (1996-01-01), Taylor
patent: 5719738 (1998-02-01), Singer et al.

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