In-line AC current limiter

Details In-line AC current limiter In-line AC current limiter

1991-12-18

1994-08-09

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 18, 361 77, 361100, H02H 324

Patent

active

053372085

ABSTRACT:
An AC current limiter, which is connected in series with a transmission line and which operates in two modes, a conductive mode and a protective mode, includes first and second transistors coupled in parallel with first and second diodes, respectively and the emitters of the first and second transistors serially coupled by a sensing element. First and second gain control networks are couple to the first and second transistors, respectively, to permit control of the gain in the first and second transistors. More particularly, as line current increases to a limiting value, the circuit operates in the protective mode. The voltage across the sensing causes a transistor in one of the first and second networks to turn on, thus diverting current from the respective first and second transistors connected in series with the transmission line. Therefore, line current is limited to a predetermined value. When the current through the circuit reverses, the other transistor and respective gain control network limits current flowing in the opposite direction.

REFERENCES:
patent: 3521087 (1969-05-01), Lombardi
patent: 3558830 (1971-01-01), Bender
patent: 3571608 (1971-03-01), Hurd
patent: 3987357 (1976-10-01), Edstrom et al.
patent: 4456940 (1984-06-01), Hammerberg et al.
patent: 4475012 (1984-10-01), Coulmance
patent: 4876620 (1989-10-01), Borkowicz

Affiliated with

Also associated with

Rating

In-line AC current limiter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with In-line AC current limiter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In-line AC current limiter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-220723