Undervoltage protection device
First Claim
1. A voltage sensitive under voltage protection device for coupling to a source and a load comprising:
- sensing means having an input and output, said means operative to sense voltage magnitudes of said source at the input thereof and producing voltages at the output thereof having magnitudes proportional to said source voltage magnitude;
switching means operative to couple and de-couple said source from said load;
voltage reference means responsive to said sensing means for operating said switching means, said reference means having preselected and substantially specific conduction and non-conduction voltage characteristics substantially unaffected over a wide range of ambient temperatures and responsive to the voltage magnitudes of the output of said sensing means such that source voltage magnitudes greater and less than a predetermined level operate said switching means upon conduction and non-conduction of said referenced means; and
said sensing means including means to selectively produce a plurality of separately adjustable direct and alternating voltage components effecting a plurality of composite direct and alternating voltage magnitudes at the output thereof which are proportional to said source voltage magnitude.
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Accused Products
Abstract
A circuit for protecting electrical apparatus from undervoltage of a source voltage by providing disconnection of the apparatus from the same. The circuit includes a relay controlled by a transistorized portion of the circuit responsive to conduction of a gas-discharge tube having specific breakdown and extinguishing voltage characteristics. The tube senses a voltage of that portion of the circuit having selectively adjustable A.C. and D.C. components proportionate to the source voltage, wherein a plurality of source voltage differentials can be selectively chosen at which connection and disconnection of the apparatus will be effected. The relay is also coupled to a capacitor to provide a time delay to prevent relay operation upon momentary voltage fluctuations.
14 Citations
14 Claims
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1. A voltage sensitive under voltage protection device for coupling to a source and a load comprising:
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sensing means having an input and output, said means operative to sense voltage magnitudes of said source at the input thereof and producing voltages at the output thereof having magnitudes proportional to said source voltage magnitude; switching means operative to couple and de-couple said source from said load; voltage reference means responsive to said sensing means for operating said switching means, said reference means having preselected and substantially specific conduction and non-conduction voltage characteristics substantially unaffected over a wide range of ambient temperatures and responsive to the voltage magnitudes of the output of said sensing means such that source voltage magnitudes greater and less than a predetermined level operate said switching means upon conduction and non-conduction of said referenced means; and said sensing means including means to selectively produce a plurality of separately adjustable direct and alternating voltage components effecting a plurality of composite direct and alternating voltage magnitudes at the output thereof which are proportional to said source voltage magnitude. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A voltage sensing undervoltage protection device comprising:
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a first and second rectifying system for coupling to a source voltage and producing a rectified source voltage therefrom; switching means operative for connecting and disconnecting a load; voltage reference means coupled to said first rectifying system and including means for selectively detecting voltage magnitudes proportional to said rectified source voltage;
said reference means having substantially specific conduction and non-conduction voltage characteristics substantially unaffected over a wide range of ambient temperatures and operatively coupled to said switching means to operate the same upon conduction and non-conduction of said reference means in response to pre-selected rectified voltage source magnitudes;time delay means coupled to said second rectifying system and said switching means, said time delay means effective to delay operation of said switching means before and after respective conduction and non-conduction of said reference means; and said means for selectively detecting voltage magnitudes comprising adjustable means coupled to said gas-discharge tube to selectively produce a plurality of separately adjustable direct and alternating voltage components producing a plurality of composite direct and alternating voltage magnitudes proportional to said source voltage to effect the conduction and non-conduction of said tube. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification