Circuit for generating a reference voltage that varies as a func

Details Circuit for generating a reference voltage that varies as a func Circuit for generating a reference voltage that varies as a func

1992-02-06

1994-05-03

Voeltz, Emanuel T.

Electricity: power supply or regulation systems

Self-regulating

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

323907, 307 101, 3072961, 320 9, G05F 330

Patent

active

053090837

ABSTRACT:
A circuit for generating a reference voltage that varies as a function of temperature, in particular for regulating the voltage at which a battery is charged by an alternator, wherein the circuit comprises: a source of a voltage that is fixed regardless of temperature; two bipolar transistors whose bases are interconnected and whose base-emitter junctions have different temperature behaviors, with constant currents flowing through each of them; a first resistor connected between the emitters of the two transistors, with the voltage across the terminals thereof being representative of the temperature to which the two transistors are exposed; and a second resistor connected between the fixed voltage source and an output for the reference voltage, and through which a current may flow, at least over a predetermined range of temperatures, which current is equal to the additional current induced by an increase in the voltage across the terminals of said first resistor relative to a voltage which corresponds to a critical temperature.

REFERENCES:
patent: 3851241 (1974-11-01), Wheatley, Jr.
patent: 4636710 (1987-01-01), Stanojevic
patent: 4945260 (1990-07-01), Naghshineh et al.
patent: 5001414 (1991-03-01), Brambilla et al.
patent: 5053640 (1991-10-01), Yum
IEE Trans. on Consumer Electronics, vol. CE-26, No. 3, Aug. 1980, pp. 211-222, New York, US; P. Menniti et al.: "A New Voltage Regulator Protects the Automotive Electronics".

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