Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1988-04-28
1989-08-22
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 92, 361 93, H02H 308
Patent
active
048601535
ABSTRACT:
A current sensing device comprises a constant d.c. voltage power supply circuit which is fed with a current flowing in one direction and outputs a positive potential, a medium potential and a negative potential at a positive output terminal, a medium output terminal and a negative output terminal, respectively a current sensing resistive element connected in series to the power circuit a differential amplifier circuit which is fed with power from the output of the power supply circuit, and converts the voltage drop across the current sensing resistive element proportional to the one-direction current into an output signal based on the medium potential between the positive potential and the negative potential of the outputs a switching circuit; a control circuit which is fed with power from the power supply circuit and receives the output signal of the differential amplifier circuit proportional to the one-direction current to control the closing operation of the switching circuit signaling device which is activated by the closure of the switching circuit to emit light or produce a warning sound; and a switching operation prohibitive circuit which is connected to prevent the switching circuit from being closed improperly when the output voltage of the power supply circuit is not enough to operate the differential amplifier or the control circuit properly.
REFERENCES:
patent: 4279007 (1981-07-01), Shimp
patent: 4297741 (1981-10-01), Howell
patent: 4379317 (1983-04-01), Conroy, Jr. et al.
patent: 4550360 (1985-10-01), Dougherty
Jennings Derek S.
Mitsubishi Denki & Kabushiki Kaisha
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