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US 5,205,785 AGranted
Control system for the ventilating means in a poultry building or the like
OwnerR. H. Richardson, Hank D. Beesleyinventors
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OwnerR. H. Richardson, Hank D. Beesleyinventors
Estimating the term…
Normally closed ventilating elements of a poultry building or the like are opened in response to failure of the supply of electric power to the building ventilating system by a control system which includes a source of direct current electricity arranged so as normally to energize an electromagnet and thereby to secure its armature to the electromagnet. The armature is secured to the handle of a winch which is arranged to operate the building shades. Power to the electromagnetic device is controlled through a MOSFET acting as a switch and which is controlled by a parallel combination of a capacitor and a resistor which are connected in parallel with the MOSFET gate. When power is lost, the capacitor discharges through the resistor and deenergizes the electromagnet so as to free its armature to rotate with the winch handle to open the building curtains.
A control system for opening normally closed ventilating means in a poultry building or the like, said system comprising a power module for supplying direct electric current, at least one electromagnet arranged when energized to engage and hold an associated armature and to release said armature when deenergized, circuit means including the drain to source channel of a MOSFET for connecting said power module in series with said electromagnet, a capacitor connected in parallel with a resistor and with the gate of said MOSFET and arranged to increase the drain to source channel resistance of said MOSFET in coordination with the discharge of said capacitor through said resistor following a predetermined reduction in the voltage of said power module thereby to deenergize said electromagnet and release said armature.
A system for controlling normally closed ventilating means of a poultry building or the like, said system comprising a source of direct electric current, an electromagnet arranged when energized to engage and hold an armature and to release said armature when deenergized, circuit means including the channel of a MOSFET for connecting and disconnecting said source of direct electric current in series with said electromagnet, a conductor connected with said source of direct electric current and in series with a diode, a resistor and with the gate of said MOSFET for maintaining the voltage at said gate above a threshold value and in an ON state thereby to maintain energization of said electromagnet.
Dependencies are inferred from the claim text.