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:
Jul. 10, 2012
Filed:
May. 11, 2010
Takanori Kohama, Matsumoto, JP;
Kazutaka Masuzawa, Ueda, JP;
Naoki Kumagai, Matsumoto, JP;
Fuji Electric Co., Ltd., Kawasaki-Shi, JP;
Abstract
A gate drive device which can suppress the fluctuation of an internal power source voltage and output voltage, while reducing the number of parts by omitting a bypass capacitor connected in parallel with a semiconductor integrated circuit, is provided. The gate drive device drives the gate of an active element with a large input capacity, such as an IGBT or MOSFET, and includes a semiconductor integrated circuit. The semiconductor integrated circuit has an internal power source based on an external power source, such as a battery. The semiconductor integrated circuit incorporates a voltage drop suppressing circuit, configured so that, if an input external power source voltage momentarily drops below a minimum operating voltage, a drop of an internal power source voltage below the minimum operating voltage, and a sharp drop in a voltage output to the gate, are prevented by the voltage drop suppressing circuit.