Self-calibrating overcurrent detector

Details Self-calibrating overcurrent detector Self-calibrating overcurrent detector

1981-03-30

1983-02-22

Eisenzopf, Reinhard H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 93, 324 51, 324130, 364483, H02H 308

Patent

active

043750729

ABSTRACT:
Circuit for detecting a fault current in an installation where the load (RL) varies. Total current (IS) is converted into a voltage (VS). During an initialization cycle, means such as counter (9), digital-to-analog converter (10), comparator (5), resistors (R1, R2) generate a voltage (VS) equal to VS at the end of the initialization cycle, and a threshold voltage VS=kVS. During operation, voltage VS is compared with threshold VD in order to provide a fault detection indication which is transmitted to the protection circuit by a logic circuit, that is, AND gate (17) and OR gate (19). During the initialization cycle, protection is obtained by comparing VS with a reference voltage in a comparator (7). This device is used to protect machines having an expandable configuration.

REFERENCES:
patent: 3626262 (1971-12-01), Kelling
patent: 3979255 (1976-09-01), Bulgier et al.
patent: 4012669 (1977-03-01), Gelfand et al.
patent: 4160282 (1979-07-01), Dolinar et al.
patent: 4208625 (1980-06-01), Piso

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