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:
Apr. 14, 2020
Filed:
Jan. 29, 2019
Fuji Electric Co., Ltd., Kawasaki-shi, Kanagawa, JP;
Morio Iwamizu, Matsumoto, JP;
Shinji Yamashina, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, Kanagawa, JP;
Abstract
A semiconductor device having an input terminal and an output terminal. The semiconductor device includes a power semiconductor element having a first main terminal connected to the output terminal, a second main terminal that is grounded and a gate terminal, and an active clamping circuit including a Zener diode and a diode connected in inverse series between the gate terminal and the first main terminal of the power semiconductor element. The semiconductor device further includes a clamp voltage switching circuit configured to switch a clamp voltage of the active clamping circuit according to a change in a voltage of the output terminal relative to the ground at a time when the power semiconductor element is turned off, the clamp voltage being switched to a first clamp voltage and a second clamp voltage, respectively, when the change in the voltage is not, and is, positive.