Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
194 words
A device for determining the occurrence of an electrical overload in an electrical system comprising: a. means for monitoring an electrical parameter in an electrical system and for generating an output signal representative of the instantaneous absolute value of the monitored electrical parameter; b. threshold control means for developing an electrical output signal of predetermined time-invariant value; c. adder means connected to receive the output signals from said monitoring means and from said threshold control means and to receive a feedback signal, said adder means being operative to generate an output signal representative of the summation of said three received signals; d. integrator means connected to receive said summation signal from said adder means and to generate an output signal representative of the integral of said summation signal; e. feedback means coupled between the output of said integrator means and the input to said adder means for feeding said integrated signal back to said adder means with a predetermined gain; and f. comparator means connected to receive the integrated signal from said integrator means and operative to generate an indicative overload signal whenever the magnitude of said integrated signal exceeds a second predetermined value.
Claim 2
Independent Claim
194 words
A device for determining the occurrence of an electrical overload in an electrical system comprising: a. means for monitoring an electrical parameter in an electrical system and for generating an output signal representative of the instantaneous absolute value of the monitored electrical parameter; b. threshold control means for developing an electrical output signal of predetermined time-invariant value; c. adder means connected to receive the output signals from said monitoring means and from said threshold control means and to receive a feedback signal, said adder means being operative to generate an output signal representative of the summation of said three received signals; d. integrator means connected to receive said summation signal from said adder means and to generate an output signal representative of the integral of said summation signal; e. feedback means coupled between the output of said integrator means and the input to said adder means for feeding said integrated signal back to said adder means with a predetermined gain; and f. comparator means connected to receive the integrated signal from said integrator means and operative to generate an indicative overload signal whenever the magnitude of said integrated signal exceeds a second predetermined value.
Claim 3
Independent Claim
226 words
A device for determining the occurrence of an electrical overload in an electrical system comprising: a. means for monitoring an electrical parameter in an electrical system and for generating an output signal representative of the instantaneous absolute value of the monitored electrical parameter; b. threshold control means for developing an electrical output signal of predetermined value; c. adder means connected to receive the output signals from said monitoring means and from said threshold control means and to receive a feedback signal, said adder means being operative to generate an output signal representative of the summation of said three received signals; d. first integrator means connected to receive said summation signal from said adder means and to generate an output signal representative of the integral of said summation signal; i. feedback means coupled between the output of said integrator means and the input to said adder means for feeding said integrated signal back to said adder means with a predetermined gain; f. second integrator means connected to receive said integrated signal from said first integrator means and to generate an output signal representative of the integral of said integrated signal; and g. comparator means connected to receive the twice integrated signal from said second integrator means and operative to generate an indicative overload signal whenever the magnitude of said twice integrated signal exceeds a second predetermined value.
Claim 4
Independent Claim
226 words
A device for determining the occurrence of an electrical overload in an electrical system comprising: a. means for monitoring an electrical parameter in an electrical system and for generating an output signal representative of the instantaneous absolute value of the monitored electrical parameter; b. threshold control means for developing an electrical output signal of predetermined value; c. adder means connected to receive the output signals from said monitoring means and from said threshold control means and to receive a feedback signal, said adder means being operative to generate an output signal representative of the summation of said three received signals; d. first integrator means connected to receive said summation signal from said adder means and to generate an output signal representative of the integral of said summation signal; i. feedback means coupled between the output of said integrator means and the input to said adder means for feeding said integrated signal back to said adder means with a predetermined gain; f. second integrator means connected to receive said integrated signal from said first integrator means and to generate an output signal representative of the integral of said integrated signal; and g. comparator means connected to receive the twice integrated signal from said second integrator means and operative to generate an indicative overload signal whenever the magnitude of said twice integrated signal exceeds a second predetermined value.
Claim 5
Dependent Claim
16 words
A device according to claim 2 wherein said predetermined gain of said feeback means is adjustable.
Claim 6
Dependent Claim
55 words
A device according to claim 2 wherein said monitoring means comprises a sensor means responsive to the instantaneous value of said monitored parameter and operative to generate therefrom a proportional output signal, and rectifying means connected to receive said proportional output signal and to generate therefrom a rectified signal which is said absolute value signal.
Claim 7
Dependent Claim
64 words
A device according to claim 2 wherein said comparator means generates a second output signal when said overload signal is less than said second predetermined value; and first limit circuit means are coupled between said first integrator means and said comparator means to clamp the output of said first integrator to substantially zero whenever said second output signals are received from said comparator means.
Claim 8
Dependent Claim
68 words
A device according to claim 4 wherein said rectifying means includes: a. a first detector responsive to AC signals in the monitored system and operative to pass only half cycles of one polarity of said AC signals; and b. a second detector responsive also the AC signals in the monitored system and operative to pass and invert only half cycles of the other polarity of said AC signals.
Claim 9
Dependent Claim
93 words
A device according to claim 5 wherein said comparator means includes: a. an operational amplifier connected to receive said twice integrated signal; b. a first pair of diodes coupled between the input and the output of said amplifier and joined together anode-to-anode; c. a second pair of diodes coupled between the input and the output of said amplifier and joined together cathode-to-cathode; d. means for biasing the anode-to-anode devices to a selected positive value to establish said second predetermined value; and e. means for biasing the cathode-to-cathode devices to a selected negative value.
Claim 10
Dependent Claim
18 words
A device according to claim 2 wherein said predetermined value developed by said threshold control means is adjustable.