Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1990-03-28
1992-05-12
Stephan, Steven L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361115, 361 97, 364483, H02H 318, H02H 326, H02H 342
Patent
active
051133040
ABSTRACT:
A circuit breaker includes a current detector for generator analog voltage signals in accordance with load current of respective phases and a control circuit for executing a tripping operation in response to the analog voltage signals. The control circuit includes an analog switch repeating a time division selecting operation that one of the analog phase voltage signals generated by the current detector is selectively allowed to pass through the same in a predetermined order, an analog-to-digital (A/D) converter for converting the analog voltage signal having passed through the analog switch to a corresponding digital signal, and a microcomputer receiving the digital voltage signal from the A/D converter and obtaining the effective load current value based on the digital voltage signals. The microcomputer generates a tripping order when the effective load current value exceeds a predetermined value. The control circuit may include an amplifier for amplifying low level analog voltage signals and supplying the amplified signals to the A/D converter.
REFERENCES:
patent: 4722059 (1988-01-01), Engel et al.
patent: 4814935 (1989-03-01), Arinobu et al.
Japanese Laid-Open Patent Application No. 62-173930, dated Jul. 30, 1987.
Furukawa Katsuhiro
Ozaki Masashi
Kabushiki Kaisha Toshiba
Shaw, Jr. Philip M.
Stephan Steven L.
To E. H.
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