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:
Dec. 07, 2021
Filed:
May. 24, 2018
Rohm Co., Ltd., Kyoto, JP;
Yoshinori Sato, Kyoto, JP;
Satoru Nate, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A current limiter 200 (corresponding to an example of a current detection circuit) has a comparator 210 and a variable delay unit 220. The comparator 210 switches a comparison signal OCP from a low level to a high level when the current to be monitored, which flows through an output switch, reaches a predetermined threshold value (in the present figure, when a sense voltage Vcs reaches an overcurrent detection voltage Vocp). The variable delay unit 220 measures a first time Tfrom when the output switch turns on by SET=H until when the comparison signal OCP switches to the high level and delays the comparison signal OCP by a second time T(=K·T) proportional to the square of the first time Tto generate an overcurrent detection signal Sc. The variable delay unit 220 includes a first timer 223 for measuring the first time Tand a second timer 224 for generating the overcurrent detection signal Sc by delaying the comparison signal OCP by the second time T