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:
Oct. 19, 1993
Filed:
Apr. 13, 1992
Roberto Vercesi, Turin, IT;
Marcello Boella, Ivrea, IT;
Marelli Autronica S.p.A., Milan, IT;
Abstract
A monitoring circuit for an electrical generator for recharging a motor vehicle battery. The monitoring circuit includes a driver transistor, a field coil current sensor, and driver circuit. The collector-emitter path of the driver transistor is connected in series to the field coil of the generator and a direct current voltage source. The field coil current sensor provides a signal indicative of the current flowing in the field coil. The driver circuit drives the transistor as a function of the voltage produced by the generator and the signal provided by the field coil current sensor. The driver circuit includes a detector circuit and a processing and comparison circuit. The detector circuit is connected to a phase of the generator and provides a signal indicative of the generator's rotation speed. The processing and comparison circuit is coupled to the detector circuit and generates a signal for controlling the conduction of current through the transistor so that the intensity of the current flowing through the collector-emitter path of the transistor varies as a function of the generator's rotation speed.