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. 28, 2023
Filed:
Mar. 18, 2021
Applicant:
Rohm Co., Ltd., Kyoto, JP;
Inventor:
Hideo Hara, Kyoto, JP;
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 3/335 (2006.01); H02M 1/08 (2006.01);
U.S. Cl.
CPC ...
H02M 3/33592 (2013.01); H02M 1/08 (2013.01);
Abstract
A direct-current voltage is applied to a series circuit composed of a switching transistor, a sense resistor, and a coil. A control circuit is configured to be capable of performing current control in which the control circuit, after turning on the switching transistor, determines a turn-off time point of the switching transistor based on a sense voltage appearing across the sense resistor, and to turn off the switching transistor during the current control if, despite a predetermined time having passed after the switching transistor being turned on, the sense voltage does not reach a predetermined threshold voltage.