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. 31, 1983
Filed:
Apr. 04, 1980
Kirk A Sievers, Roselle, IL (US);
Motorola Inc., Schaumburg, IL (US);
Abstract
A regulated automotive alternator battery charging system is disclosed. The system comprises an engine-powered alternator which provides a rectified alternator output signal for charging an automobile battery in accordance with an alternator field coil excitation signal provided by a voltage regulator which senses the battery voltage and alters the field coil excitation in response thereto to maintain the battery in a charged condition. The voltage regulator comprises an oscillator for developing a constant frequency signal which is independent of engine speed and battery load. The regulator includes circuitry for varying the duty cycle of this constant frequency signal in accordance with the sensed magnitude of battery voltage, and the constant frequency but variable duty cycle signal is utilized to provide field coil excitation for the alternator wherein the system maintains the battery voltage at a substantially constant magnitude.