Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1986-09-26
1988-08-16
Hix, L. T.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
123490, H01H 4732, F02D 4130
Patent
active
047648406
ABSTRACT:
An improved dual limit solenoid driver control circuit is disclosed in which solenoid current is sensed and provided as an input to two separate comparators (24, 25). Each comparator receives, during a solenoid pull-in (initial) period (T.sub.1), fixed maximum and minimum reference threshold levels which determine the maximum and minimum current limits (I.sub.max, I.sub.min) for solenoid current during initial pull-in excitation. Subsequently during a hold period T.sub.2 following the pull-in period, each of the comparators receives different maximum and minimum thresholds so as to establish holding solenoid current limits (H.sub.max, H.sub.min). The outputs of the compartors are connected as inputs to a set/reset flip flop (32) whose output controls the operation of a solenoid driver circuit (15). A monostable multivibrator (33) reacts to an initial control pulse (41) to produce a predetermined pull-in time pulse (43) that results in the maximum and minimum pull-in solenoid current limits. The comparator thresholds are provided by a fixed resistor divider circuit (27, 29, 31) which receives a pull-in signal from the monostable multivibrator. The pull-in period (T.sub.1) is independent of the sensed solenoid current, and the switching thresholds are fixed and independent of the magnitude of the solenoid current during the pull-in and hold periods. The above configuration provides improved performance and stability, and is readily implemented with just a few components.
REFERENCES:
patent: 4266261 (1981-05-01), Streit et al.
patent: 4295177 (1981-10-01), Woodhouse et al.
patent: 4300508 (1981-11-01), Streit et al.
patent: 4605983 (1986-08-01), Harvey
Edwards Arthur J.
Karlmann Thomas F.
Parmelee Steven G.
Petrie Adelore F.
Gray David M.
Hix L. T,.
Melamed Phillip H.
Motorola Inc.
LandOfFree
Dual limit solenoid driver control circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual limit solenoid driver control circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual limit solenoid driver control circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-603803