Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1988-06-28
1989-10-31
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361187, H01H 4704
Patent
active
048781479
ABSTRACT:
In an electromagnetic coil drive device an operation coil excites an electromagnet. A switching element is turned on and off by application of a pulse signal thereto and supplies the operation coil with a power supply voltage. A voltage detecting circuit detects the power supply voltage and a gain circuit delivers a closing level signal in accordance with the voltage detected by the voltage detecting circuit. The gain circuit also delivers a holding level signal based on the detected voltage after a predetermined period of time. The level of the holding level signal is higher than that of the closing level signal. A reference wave generating circuit generates a triangular wave. A comparing circuit compares the triangular wave with the closing level signal to thereby generate a closing pulse signal having a predetermined cycle. The comparing circuit also compares the triangular wave with the holding level signal after the predetermined period of time to thereby generate a holding pulse signal having a duty ratio smaller than that of the closing pulse signal. An on-off drive circuit supplies the switching element with the closing and holding pulse signals.
REFERENCES:
patent: 4071877 (1978-01-01), Stewart et al.
patent: 4516185 (1985-05-01), Culligan et al.
patent: 4633362 (1986-12-01), Saunders
patent: 4636912 (1987-01-01), Ohtani
patent: 4641219 (1987-02-01), Aiba
patent: 4649458 (1987-03-01), Arai et al.
patent: 4679116 (1987-07-01), Oshizawa et al.
patent: 4812945 (1989-03-01), D'Onofrio
Omori Koji
Oyama Sakan
Kabushiki Kaisha Toshiba
Pellinen A. D.
Williams H. L.
LandOfFree
Electromagnetic coil drive device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electromagnetic coil drive device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetic coil drive device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-629712