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. 09, 1985
Filed:
Nov. 22, 1982
Shigetoshi Ishida, Narashino, JP;
Tanaka Kogyo Company, Ltd., Narashino, JP;
Abstract
An ignition circuit for an internal combustion engine includes an ignition coil having a primary winding which is controlled by a power transistor. The lower transistor is controlled by either a first or a second control transistor. When the primary current flowing through the primary winding of the ignition coil is lower than a predetermined value, cut-off of the power transistor is controlled by the first control transistor. When the primary current is higher than the pre-determined value, cut-off of the power transistor is controlled by the second control transistor which becomes conductive prior to conduction of the first control transistor. Thus, two independent control means are alternately operated responsive to the primary current, which is a function of engine speed.