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:
Mar. 24, 1998
Filed:
Jun. 07, 1995
Mutsuhiro Mori, Hitachi, JP;
Ryuichi Saito, Hitachi, JP;
Shin Kimura, Hitachi, JP;
Syuuji Saitoo, Katsuta, JP;
Kiyoshi Nakata, Ibaraki-ken, JP;
Akira Horie, Katsuta, JP;
Yoshihiko Koike, Hitachi, JP;
Shigeki Sekine, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An inverter device includes plural modules, each module being formed by a series circuit having a parallel circuit of a first switching device and a first diode, and a parallel circuit of a second switching device and a second diode, allowing a reduced size, high reliability, high frequency switching and low noise. Each module forms one arm portion of the inverter. Lifetimes of the diodes and the switching devices are set in a manner to equalize losses in the inverter. Preferably, insulated gate bipolar transistors (IGBTs) formed by diffusion are used as the switching devices since the lifetimes of these devices can easily be adjusted to optimize design of the inverter.