Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1984-07-11
1986-07-08
Hix, L. T.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361190, H01H 4724
Patent
active
045996750
ABSTRACT:
A solid state switching system for use with solenoid operated control valves, especially control valves for dangerous machinery including a light screen guard fitted for personnel protection. The switching system comprises two transistors in series with the solenoid coil. A self-checking monitoring system for monitoring the state of the two switches is provided. The monitoring system has a plurality of switching elements arranged in such a way that no single electrical fault can result in an inadvertent energization of the control valve. Specifically in the event that one of the switches is off while the other is still conducting, the monitoring system inhibits switching on of the switch that is off. The monitor system verifies that no fault has occurred during any one cycle of operation which might not otherwise be apparent. Every component in the switching and monitoring circuits functions during each on/off cycle. A logic interface is provided and only permits a subsequent cycle to commence when every monitor output from each switching system is satisfactory.
REFERENCES:
patent: 3662227 (1972-05-01), Morrison et al.
patent: 4291359 (1981-09-01), Dieterle
Fisher Kenneth W. J.
Hare Michael J.
Gray David M.
Hix L. T,.
P. J. Hare Limited
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