Voltage detector
AssigneeLambda Electronics, Inc.
InventorIsaac Cohen
Life of this patent
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Abstract
A voltage detector to sense deviations of instantaneous value of a monitored voltage from a desired value is provided. The system includes a reference voltage source for providing a reference voltage. A divider responsive to the monitored voltage and the reference voltage divides the reference voltage by the monitored voltage. Thereafter a window comparator responsive to an output of the divider produces an indication when the output of the divider is either higher than some predetermined high value or lower than some predetermined low value.
Claims11
A voltage detector to sense deviations of instantaneous value of monitored AC voltage from pre-determined desired values, comprising:
- a reference AC voltage source independent from said monitored AC voltage for providing a reference AC voltage having said pre-determined desired values;
- divider means responsive to said monitored AC voltage and said reference AC voltage for dividing said reference voltage by said monitored voltage;
- and
- window comparator means responsive to an output of said divider for producing an indication when the output of said divider means is either higher than some predetermined high value or lower than some predetermined low value, said window comparator means providing an output in response to an instantaneous deviation of said monitored AC voltage from said desired values.
A voltage detector of claim I wherein said reference voltage and said monitored voltage are full wave rectified prior to being divided by said divider means.
A method of sensing deviation of instantaneous values of a monitored AC signal from a predetermined desired AC signal, comprising the steps of:
- providing a reference AC signal independent from said monitored signal;
- dividing, said reference signal by said monitored voltage to obtain a division signal;
- and
- producing an indication when said division signal is either higher than some predetermined high value, or lower than some predetermined low value, said indication being produced whenever said instantaneous value of said monitored signal deviates from an instantaneous value of said predetermined desired AC signal.
Dependencies are inferred from the claim text.