Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-07-25
1999-04-06
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340661, 340662, 324537, G08B 2100
Patent
active
058924507
ABSTRACT:
The invention relates to a circuit arrangement for testing the operation of a current monitoring circuit for a power transistor. The power transistor consists of several single transistors of the same size connected in parallel, through which a fraction of the total current supplied to the power transistor flows. A monitoring signal proportional to the current flowing through one of the single transistors, is supplied to the current monitoring circuit, which generates an alarm signal when this monitoring signal exceeds a specified threshold value. The single transistors are divided into a group containing a small number of single transistors (T.sub.1.1 -T.sub.1.9) connected in parallel and a group with a larger number of single transistors (T.sub.2.1,1 -T.sub.2.2,9) connected in parallel, which can be driven independently of each other, where the single transistor (T.sub.S) supplying the monitoring signal belongs to the smaller group. A control circuit (ST) is provided, which, in one monitoring mode, in which only a current that is reduced in relation to the number of single transistors in the two groups, is supplied to the power transistor (T.sub.S, T.sub.1, T.sub.2), puts the larger group of single transistors into the off-state.
REFERENCES:
patent: 3702469 (1972-11-01), Golja
patent: 4538198 (1985-08-01), Imanishi et al.
patent: 5559500 (1996-09-01), Kase
Bayer Erich
Scoones Kevin
Donaldson Richard L.
Hofsass Jeffery A.
Kempler William B.
La Anh
Texas Instruments Incorported
LandOfFree
Circuit arrangement for testing the operation of a current monit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit arrangement for testing the operation of a current monit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit arrangement for testing the operation of a current monit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1375034