The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 1994
Filed:
Feb. 06, 1992
Jean-Marie Pierret, Paris, FR;
Didier Canitrot, Saint-Maur Des Fosses, FR;
Valeo Equipements Electriques Moteur, Creteil, FR;
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.