Constant voltage circuit

Details Constant voltage circuit Constant voltage circuit

2008-09-19

2009-10-27

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

C323S317000

Reexamination Certificate

active

07609046

ABSTRACT:
An inverse temperature characteristic generating circuit decreases an output voltage Voutby a voltage VGS, and supplies the resultant voltage as a voltage VA to a temperature characteristic generating circuit. The temperature characteristic generating circuit includes a differential amplification circuit that receives a terminal voltage VAPbetween resistances R22and R23and an emitter voltage VAMof a bipolar transistor T21, and outputs a control signal VC. When the terminal voltages VAPand VAMare equal to each other, an operation of a circuit is stable. The temperature characteristic of the voltage VA during the stable operation, and the temperature characteristic of the voltage VGSare inverse to each other and therefore cancel each other, so that the constant voltage Voutindependent of temperature is output. In addition, the output terminal is not connected via a resistance to a ground, so that low current consumption can be easily achieved.

REFERENCES:
patent: 6937001 (2005-08-01), Ueda
patent: 7233136 (2007-06-01), Makino et al.
patent: 7256643 (2007-08-01), Pan et al.
patent: 7414384 (2008-08-01), Kimura
patent: 2007/0241736 (2007-10-01), Oriwara et al.
patent: 08-185232 (1996-07-01), None

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