Circuit for supplying constant voltage

Details Circuit for supplying constant voltage Circuit for supplying constant voltage

2006-07-04

2006-07-04

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

C323S315000

Reexamination Certificate

active

07071671

ABSTRACT:
A constant voltage supplying circuit including an output transistor is connected to a power source line and an output terminal. A base-emitter voltage of the output transistor is detected by a voltage detecting circuit composed of a transistor. A current-outputting circuit for supplying a current determined based on the voltage detected by the voltage detector to a reference voltage supplying circuit is used in the constant voltage supplying circuit. The reference voltage is supplied to a base of the output transistor to cancel a base-emitter voltage of the output transistor and to equalize the output voltage to a voltage generated in a reference voltage generating element included in the reference voltage supplying circuit. In this manner, the output voltage is kept constant notwithstanding variation of output current.

REFERENCES:
patent: 4338646 (1982-07-01), Davis et al.
patent: 5168210 (1992-12-01), Thus
patent: 6255807 (2001-07-01), Doorenbos et al.
patent: A-7-261862 (1995-10-01), None
patent: A-2003-150256 (2003-05-01), None

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