Constant current circuit

Details Constant current circuit Constant current circuit

1977-08-09

1978-09-05

Goldberg, Gerald

Electricity: power supply or regulation systems

Remote sensing

307297, 307299B, G05F 156

Patent

active

041123468

ABSTRACT:
A constant current circuit includes two characteristic-correlated PNP transistors connected to a constant voltage source and having common-connected emitters and common-connected bases and an NPN transistor. A constant current is taken out of a collector of a first PNP transistor. A collector of a second PNP transistor is connected to a base of the NPN transistor and the common-connected emitters of the first and second PNP transistors is connected to a collector of the NPN transistor to form a negative feedback circuit in the first PNP transistor, whereby when a current gain of the second PNP transistor which is characteristic corelated to the first PNP transistor is high a large amount of feedback is applied and when the current gain is low a small amount of feedback is applied so that the magnitude of the output constant current taken from the collector of the first PNP transistor is adjusted.

REFERENCES:
patent: 3714543 (1973-01-01), Sahara et al.
patent: 4063120 (1977-12-01), Idei
"Current Source" by Platt & Pomeranz; IBM Tech. Disc. Bull., vol. 14, No. 5, Oct. 1971, p. 1495.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2098780