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:
Apr. 18, 1978
Filed:
Mar. 05, 1976
Takasi Hachiga, Kariya, JA;
Nippondenso Co., Ltd., Kariya, JA;
Abstract
A contactless ignition system for an internal combustion engine responds to alternating current ignition signals produced in timed relationship with the engine. A primary winding of an ignition coil and a collector-emitter path of a switching transistor are connected across a direct current power source. A trigger circuit responds each cycle of the alternating current ignition signals for operating the switching transistor conductive and nonconductive in timed relationship with the engine to carry an ignition spark. A primary current limiting circuit, responsive to the voltage potential at the direct current power source, controls the amount of the base current for the switching transistor in accordance with the increased voltage of the power source, to thereby limit the primary current flowing through the primary winding to a predetermined magnitude.