Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1985-09-13
1986-12-23
Gellner, Michael L.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
H01H 4722
Patent
active
046316299
ABSTRACT:
Electrical apparatus is disclosed in which a line voltage supplies current to an electrically operated solenoid through an operable switch interconnected therebetween. A control circuit is coupled to the switch and controls the operation thereof such that the control circuit operates to increase the duration of current flow to the solenoid when the line voltage level decreases. The control circuit includes appropriate circuitry for generating a reference voltage independent of the line voltage level, for generating a control voltage proportional to the line voltage level, and for operating the switch to permit current flow to the solenoid whenever the control voltage exceeds the reference voltage. The control circuit can also include circuitry to increase the duration of current flow to the solenoid upon the occurrence of vibration with the solenoid above a predetermined level, and/or for increasing the duration of current flow upon initial energization of the solenoid.
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Gellner Michael L.
Westinghouse Electric Corp.
Yatsko M. S.
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