Constant voltage generating circuit

Details Constant voltage generating circuit Constant voltage generating circuit

1991-01-31

1992-07-14

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

307264, 307446, 307475, G05F 320

Patent

active

051306379

ABSTRACT:
A constant voltage generating circuit includes a first power supply line coupled to an external power supply line, at least one second power supply line having a voltage different from that of the first power supply line, a level shift circuit having at least one transistor coupled between the first power supply line and the second power supply line, a resistor having one end connected to one of the first and second power supply lines and other end coupled to a base of a transistor provided at a final stage of the level shift circuit, and a current control circuit operatively connected between the other end of the resistor and another of the first and second power supply lines. The current control circuit suitably controls current flowing in the resistor. As a result, it is possible to continually feed a constant voltage irrespective of a fluctuation in temperature, power supply voltage, or the like.

REFERENCES:
patent: 3781648 (1973-12-01), Owens
patent: 4339707 (1982-07-01), Gorecki
patent: 4713600 (1987-12-01), Tsugaru et al.
patent: 4725770 (1988-02-01), Okutsu et al.
patent: 4794317 (1988-12-01), van Tran

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