Output circuit for controlling a relay which has capability for

Details Output circuit for controlling a relay which has capability for Output circuit for controlling a relay which has capability for

1993-06-15

1995-04-25

Pellinen, A. D.

Electrical transmission or interconnection systems

Miscellaneous systems

For particular load device

361154, H01H 4704

Patent

active

054101875

ABSTRACT:
A relay output circuit is provided which enables a relay coil to be connected to a possibly variable input DC voltage without requiring relatively high power components to be used. The relay coil is provided with sufficient current to actuate it and then the actuating current is decreased to a lesser magnitude which is sufficient to maintain the relay in an actuated position. In order to accomplish this, the relay output circuit first provides current to the coil through a single resistor and then effectively connects an additional resistor in series with the initial resistor to decrease the current flowing through the coil. The second resistor is effectively added to the circuit by turning off a field effect transistor that provides a shorting across the second resistor when it is in a conductive state. The conductive state of the field effect transistor is controlled by a capacitor which charges for a preselected period of time following a change of state of an input circuit point.

REFERENCES:
patent: 3590334 (1971-06-01), Baker
patent: 3660730 (1972-05-01), Mason
patent: 4065096 (1977-12-01), Frantz et al.
patent: 4227231 (1980-10-01), Hansen et al.
patent: 4454558 (1984-06-01), Huddart
patent: 4473862 (1984-09-01), Hill
patent: 4511829 (1985-04-01), Wisniewski
patent: 5168418 (1992-12-01), Hurley et al.

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