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:
Feb. 18, 1997
Filed:
Nov. 01, 1995
Shinji Ooyabu, Anjo, JP;
Mitsuyasu Enomoto, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An IGBT driving circuit includes an IGBT connected in series with a primary winding of an ignition coil and a current detecting resistor. A transistor is connected to the gate of the IGBT to apply a gate voltage in response to an ignition signal. A comparator compares a voltage produced across the current detecting resistor with a comparison voltage. An NPN transistor connected to the gate of the IGBT turns on and off in response to the comparison result of the comparator to adjust the gate voltage. The gate voltage is fed back to the detection terminal side of the comparator for oscillation suppression through an oscillation suppressing resistor. A charge/discharge control resistor is connected between the gate of the IGBT and the oscillation suppressing resistor and a diode is connected in parallel with the charge/discharge control resistor, so that the electric current flowing to the IGBT is maintained constant.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile