Constant-voltage circuit insensitive to source change

Details Constant-voltage circuit insensitive to source change Constant-voltage circuit insensitive to source change

1984-08-27

1985-12-24

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323316, G05F 318

Patent

active

045609195

ABSTRACT:
A constant-voltage circuit includes a transistor (Q3) for output control connected between a source potential and a ground potential and a divider circuit (R1, R2, D2, D3) which are connected in series. The dividing point of the divider circuit connected between the emitter of the transistor (Q3) and the ground potential serves as an output terminal to be supplied with a predetermined voltage by the emitter of the transistor (Q3), so that a constant voltage appears at the output terminal. Connection between the base and the collector of the transistor (Q3) is so improved that the emitter voltage is not changed following a change in the source voltage. More specifically, the transistor (Q3) is connected in such a manner that the collector-to-emitter voltage is continuously clamped by the base-to-emitter voltage of the transistor (Q3), so that the transistor (Q3) is not subjected to a base width modulation effect and thus the emitter potential is not changed following the change in the source voltage.

REFERENCES:
patent: 4085359 (1978-04-01), Ahmed
patent: 4349778 (1982-09-01), Davis
patent: 4352056 (1982-09-01), Cave et al.
"Voltage Regulator Handbook", National Semiconductor, p. 10.116 (LM342 Series), N. Sevastopoulos, Ed.
"Voltage Regulator Handbook", Japanese ed., Fairchild NDC 548, pp. 1-4 (u A 723 Series), Jun. 10, 1979.

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