Regulated power supply circuit and an emitter follower output cu

Details Regulated power supply circuit and an emitter follower output cu Regulated power supply circuit and an emitter follower output cu

1994-06-27

1996-08-27

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323274, 323279, G05F 1573

Patent

active

055504620

ABSTRACT:
The present invention provides a regulated power supply circuit capable of stably limiting an output current even in a case where an output current detecting resistor having a low resistance is used. Emitter current of a series regulating transistor Q11 is detected by a current detecting resistor R8. The transistor Q11 is controlled by a transistor Q10 connected by a Darlington connection thereto. A current limiting circuit is composed of transistors Q12 and Q13, which are connected at their bases with one another. The collector of Q12 is connected to the base of Q10 so that the base current of Q10 is reduced at the time of limiting the output current. Emitters of Q12 and Q13 are connected to the resistor R8 by way of resistors R7 and R14, respectively.

REFERENCES:
patent: 4338646 (1982-07-01), Davis et al.
patent: 4507600 (1985-03-01), Okayama
patent: 4926109 (1990-05-01), Koterasawa
patent: 4950975 (1990-08-01), Fleischer
patent: 5491401 (1996-02-01), Inoue et al.

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