Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1985-08-23
1986-09-30
Gellner, Michael L.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361210, H01H 4722
Patent
active
046149929
ABSTRACT:
Actuators typically include one or more coils which are driven by a current source to effect positioning of a movable member. However, faults can occur wherein a conductor connecting the coil to the current source is open circuited or short circuited to ground. This can lead to a loss of control over the actuator, in turn creating a potentially dangerous condition. In order to overcome this problem, an actuator driver circuit according to the present invention includes a first current source for generating a first current at an output terminal thereof, a second current source for generating a second current at an output terminal thereof and first and second actuator coils connected in parallel between the output terminals of the first and second current sources. The current sources are controlled so that at least one of the current sources is capable of generating current for the coils even in the event of an open or short circuit fault condition.
REFERENCES:
patent: 4338651 (1982-07-01), Henrich
patent: 4355619 (1982-10-01), Wilkinson
patent: 4447851 (1984-05-01), Simmons
Gellner Michael L.
Sundstrand Corporation
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