Switching circuit

Details Switching circuit Switching circuit

1982-06-04

1984-04-03

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 86, 361 93, 361 91, 307464, 307471, 307445, H02H 720

Patent

active

044411367

ABSTRACT:
A switching circuit has a solid state power switch (9) which is either a PNP or NPN transistor or a VMOS p- or n-channel device. Three individual sensing circuits (2, 3, 4) are set to indicate whether a predetermined operating characteristic of the switch (9) is greater or less than a given threshold value and thus to indicate if a fault is present in the switch (9) or the load (L) it supplies. Digital logic circuit means comprising three logic circuits (5, 6, 8) produce two digital signals from the output signals of the sensing circuits respectively indicating if a fault exists and if it is a serious fault or not. A circuit (7) comprising gating means disables the switch (9) in the event of a serious fault and a delay circuit (33, 34) is provided associated with the logic circuit means to prevent current surges due to short circuit faults being confused with normal operating current surges in switch on.

REFERENCES:
patent: 3589282 (1971-06-01), King
patent: 3663958 (1972-05-01), Crane
patent: 3906258 (1975-09-01), Moe
patent: 3944889 (1976-03-01), Conway
patent: 3950656 (1976-04-01), Sumida et al.
patent: 4016459 (1977-04-01), Boehringer
patent: 4021701 (1977-05-01), Davies
patent: 4024437 (1977-05-01), Suzuki
patent: 4127887 (1978-11-01), Tanaka et al.
patent: 4150413 (1979-11-01), Nerem
patent: 4178620 (1979-12-01), Yu

Affiliated with

Also associated with

Rating

Switching circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Switching circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switching circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-669818