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. 08, 2019
Filed:
Oct. 30, 2015
North-west University, Potchefstroom, ZA;
Petrus Paulus Krüger, Potchefstroom, ZA;
Barend Visser, Potchefstroom, ZA;
NORTH-WEST UNIVERSITY, Potchefstroom, ZA;
Abstract
An ignition system () comprises a high voltage transformer () comprising a primary winding () and a secondary winding (). A primary resonant circuit () is formed by the primary winding () and a primary circuit capacitance (). A secondary resonant circuit () is formed by an ignition plug (), as a load, the secondary winding (); the ignition plug () being represented by a secondary circuit capacitance () and a secondary circuit load resistance (Rp) put in parallel. Said load resistance value varies during an ignition cycle. The primary resonant circuit () and the secondary resonant circuit () have a common mode resonance frequency (f) and a differential mode resonance frequency (f). A controller () is configured to cause a drive circuit () to drive the primary winding at a frequency, which is either the common-mode resonance frequency (f) or the differential mode resonance frequency (f) and is connected to a feed-back circuit () to adapt the frequency of the primary winding to the variable load resistance.