Linearly adjustable logarithmic output current sensing...

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor

Reexamination Certificate

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C323S367000

Reexamination Certificate

active

06985342

ABSTRACT:
A resistance network is provided for synthesizing a non-linear logarithmic response in the resistance of the network comprising a potentiometer from the change of the resistance of the potentiometer. The network additionally comprises a set of resistors. The potentiometer allows the resistance of the network to be varied, while the network manipulates the current in such a fashion that the input current required to produce a desired output voltage is a linear function of the resistance of the potentiometer. Incorporated into a current overload detection circuit, this allows an even spacing of the desired trip current settings about the dial of the potentiometer.

REFERENCES:
patent: 3202884 (1965-08-01), Bullock
patent: 3327171 (1967-06-01), Lipnitz et al.
patent: 3723285 (1973-03-01), Daga et al.
patent: 3766436 (1973-10-01), Zocholl
patent: 4047235 (1977-09-01), Davis
patent: 4271444 (1981-06-01), Howell
patent: 5146154 (1992-09-01), Lippmann et al.
patent: 5502374 (1996-03-01), Cota

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