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. 10, 2020
Filed:
Dec. 07, 2017
Rohm Co., Ltd., Kyoto, JP;
Takayuki Nakashima, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
The voltage variation detection circuit includes: a threshold voltage generation circuit arranged to generate a threshold voltage; a comparator arranged to compare a variation detection-target voltage and the threshold voltage to each other; and a controller arranged to control the threshold voltage generation circuit based on output of the comparator. Repeated are operations of: decreasing the threshold voltage stepwise; when the variation detection-target voltage has come to the threshold voltage or more, first increasing the threshold voltage by specified steps and then again decreasing the threshold voltage stepwise; and when the variation detection-target voltage has come to the threshold voltage or more, increasing the threshold voltage by specified steps. The controller detects a variation of the variation detection-target voltage based on control results at time points when the variation detection-target voltage comes to the threshold voltage or more.