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:
Jan. 05, 1999
Filed:
Jun. 25, 1997
Paul W McLeod, Warrenville, SC (US);
R.E. Phelon Co., Inc., Aiken, SC (US);
Abstract
An improved capacitive discharge ignition apparatus includes disable circuitry for permitting shut-off of the engine. The disable circuitry includes a SCR and a transistor in series to provide a bypass for current that would otherwise charge the ignition capacitor. The SCR is gated by a RC circuit charged by momentary contact of a user-actuated switch. The transistor is rendered conductive only during periods when a positive voltage is induced on the charge coil, thereby limiting discharge of the RC circuit. In addition, the RC circuit is regeneratively charged by a leakage current through the SCR gate. The disable circuitry thus achieves engine stoppage regardless of the time required.