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. 21, 1999
Filed:
Jan. 17, 1995
Gourab Majumdar, Fukuoka, JP;
Shinji Hatae, Fukuoka, JP;
Tatsuo Oota, Fukuoka, JP;
Masanori Fukunaga, Amagasaki, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A controller for power devices which is not required to individually insulate high and low potential portions and to include an insulated power supply is disclosed. An external controller (6) is connected to a second internal control circuit (4) which is in turn connected to a level shift circuit (5) and a gate electrode of a transistor (Q2). Power supply voltage (V1) is applied to the second internal control circuit (4) for operation thereof. The level shift circuit (5) is connected to a first internal control circuit (3) which is in turn connected to a gate electrode of a transistor (Q1) and a charge pump circuit (7). Control of a first semiconductor circuit is made through the level shift means in response to an input signal generated on the basis of a second main power supply potential, thereby achieving increased responsiveness of the power devices to a control signal and improved integration.