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:
Nov. 15, 2022
Filed:
Feb. 03, 2020
Applicant:
Rohm Co., Ltd., Kyoto, JP;
Inventor:
Kenji Hama, Kyoto, JP;
Assignee:
ROHM CO., LTD., Kyoto, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03K 3/00 (2006.01); H03K 17/16 (2006.01); H02M 1/08 (2006.01); H02M 3/158 (2006.01); H03K 17/06 (2006.01); H01L 25/07 (2006.01);
U.S. Cl.
CPC ...
H03K 17/063 (2013.01); H02M 1/08 (2013.01); H01L 25/072 (2013.01); H03K 2217/0081 (2013.01);
Abstract
A switch driving device includes a gate driver, a bootstrap circuit, a current limiting portion, and a current control portion. The gate driver drives an N-type semiconductor switch element. The bootstrap circuit includes a boot capacitor and a boot diode and applies a voltage to the gate driver. The current limiting portion limits a current to be supplied to the boot capacitor. The current control portion controls operations of the current limiting portion. The current limiting portion is provided on a path that electrically connects the boot capacitor and the boot diode to each other.