Constant-current generating circuit

Details Constant-current generating circuit Constant-current generating circuit

1984-12-27

1986-07-29

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323901, 323907, G05F 316

Patent

active

046032908

ABSTRACT:
A constant-current generating circuit for supplying a constant current independently of any variations in the source voltage, and further having the true thermal characteristic of the base-emitter voltage of a transistor is constituted in such a manner that the base-emitter voltage of a first transistor is precisely converted into a current, and this current is used as a current source. Another constant-current generating circuit operable at a relatively low source voltage, and capable of minimizing a possible error in supplying a current to the load even when the d.c. current amplification factor of a load-current supplying transistor is low is constituted in such a manner that the emitter of a second transistor which constitutes a negative feedback circuit in combination with a first transistor for generating a constant voltage is connected, directly or via a resistance, to the earthing terminal, and the collector current of a third transistor which constitutes a current mirror circuit in combination with a fifth load-current supplying transistor is controlled by the negative feedback circuit.

REFERENCES:
patent: 3886435 (1975-05-01), Steckler
patent: 4051392 (1977-09-01), Rosenthal et al.
patent: 4352057 (1982-09-01), Okada et al.
patent: 4472675 (1984-09-01), Shinomiya
patent: 4473794 (1984-09-01), Early et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-701303