Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Patent
1978-12-08
1980-07-22
Miller, J. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
361 8, 361194, 361 92, 318139, H02P 300
Patent
active
042142881
ABSTRACT:
Disclosed herein is a direct current motor control circuit adapted for connection to first and second supply terminals of DC power source and to a DC motor connected between the positive and negative terminals of a DC power source, the control circuit including a solenoid including a solenoid coil having one end connected to the first supply terminal and having an opposite end, and having a pair of solenoid contacts connected in series relation with the DC motor between the positive and negative terminals and which close to energize the DC motor when current flows through the solenoid coil. The circuit also includes semiconductor switching means having a first terminal connected to the opposite end of the solenoid coil, a second terminal connected to the second supply terminal, and a third terminal, the switching means being selectively rendered conductive for allowing current flow through the solenoid coil, and protective solenoid latching circuit means including an optical coupler for electrically isolating the solenoid contacts from the solenoid coil, the coupler having a light sensitive transistor connected to the third terminal of the semiconductor switching means and having an LED, the protective circuit means also including an upper voltage threshold means connected in series relation with the LED across the solenoid contacts so that when the voltage across the solenoid contacts exceeds a predetermined upper value, current flows through the voltage threshold means and the LED to render conductive the light sensitive transistor which shunts the third terminal of the semiconductor switching means to prevent conduction of the semiconductor switching means and chatter of the solenoid contacts.
REFERENCES:
patent: 3118091 (1964-01-01), De Sautels
patent: 3522481 (1970-08-01), Terzic
patent: 3639808 (1972-02-01), Ritzow
patent: 3818293 (1974-06-01), Wood et al.
patent: 3868549 (1975-02-01), Schaefer et al.
patent: 4008423 (1977-02-01), Christianson et al.
patent: 4099105 (1978-07-01), McAuliffe
Cavil David T.
McAuliffe Gerald N.
Miller J. D.
Outboard Marine Corporation
Schroeder L. C.
LandOfFree
Direct current motor control with protective solenoid latching does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Direct current motor control with protective solenoid latching, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct current motor control with protective solenoid latching will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2181117