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:
Oct. 23, 2018
Filed:
Feb. 12, 2016
Rohm Co., Ltd., Kyoto, JP;
Daiki Yanagishima, Kyoto, JP;
Chinatsu Nakaoka, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A switch drive circuit for driving a switching device includes an overcurrent detector which detects an overcurrent passing through the switching device, and a voltage controller which applies a control voltage to the switching device to control the switching device between On and Off states. When the overcurrent detector detects an overcurrent, the voltage controller applies to the switching device a control voltage that initially drops to a predetermined voltage higher than the threshold voltage of the switching device and that then, after the lapse of a predetermined time, drops further to the ground potential of the switch drive circuit to turn off the switching device. When the overcurrent detector detects no overcurrent, the voltage controller applies to the switching device a control voltage that drops, before the lapse of the predetermined voltage, to the ground potential of the switch drive circuit to turn off the switching device.