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:
Jan. 04, 2022
Filed:
Oct. 21, 2019
Applicant:
Denso Corporation, Kariya, JP;
Inventor:
Tetsuya Dewa, Kariya, JP;
Assignee:
DENSO CORPORATION, Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 3/00 (2006.01); H03K 17/00 (2006.01); H03K 17/16 (2006.01); H03K 17/567 (2006.01); H03K 17/081 (2006.01); H02M 1/08 (2006.01); H02M 7/5387 (2007.01); H02P 27/06 (2006.01); H03K 17/082 (2006.01); H03K 17/06 (2006.01);
U.S. Cl.
CPC ...
H03K 17/08116 (2013.01); H02M 1/08 (2013.01); H02M 7/5387 (2013.01); H02P 27/06 (2013.01); H03K 17/063 (2013.01); H03K 17/0828 (2013.01); H03K 17/162 (2013.01); H03K 2017/066 (2013.01); H03K 2217/0027 (2013.01);
Abstract
A drive circuit Dr for a switch that reduces a surge voltage caused when a switch SW is switched to an off state. The drive circuit Dr detects, as an on voltage Von, a collector-emitter voltage of the switch SW while the switch SW is in an on state. When the detected on voltage Von is large, the drive circuit Dr sets a resistance value Rd of a discharging resistorwhen the switch SW is switched to an off state to be larger than the resistance value Rd when the detected on voltage Von is small. More specifically, the drive circuit Dr sets the resistance value Rd to a larger value as the detected on voltage Von is increased.