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:
Dec. 07, 2004
Filed:
Dec. 06, 2002
Denso Corporation, Kariya, JP;
Abstract
A load drive circuit, disposed to drive an inductive load, includes a reflux closed circuit connected to the load. A flywheel diode is placed in the reflux closed circuit. A MOS transistor, disposed to turn on/off current to drive the load, is connected in parallel to the flywheel diode. A capacitor is disposed to connect its both ends to a gate and a drain of the MOS transistor, while a resistor is disposed to connect its both ends to the gate and a source of the MOS transistor. During a recovery operation of the flywheel diode, with the help of the capacitor and resistor, a gate-to-source voltage of the MOS transistor is pulled up to a value over a threshold for a predetermined period of time. Pulling up the gate-to-source voltage results in a softened recovery characteristic of the flywheel diode, suppressing recovery surges.