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. 19, 2002
Filed:
Nov. 13, 2001
Hirokazu Oki, Kyoto, JP;
Koichi Inoue, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A stabilized DC power supply device that maintains an output voltage thereof at a constant level despite a fluctuation arising in a power supply voltage fed thereto comprises a control circuit that compares the output voltage with a reference voltage so as to output a control signal by which the output voltage is maintained at a predetermined level, and a ripple cancellation circuit that amplifies an undulating component included in the power supply voltage at a predetermined gain and that feeds out a resulting signal as an undulation compensation signal for correcting the output voltage, wherein the undulation compensation signal for correcting the output voltage is superimposed on the reference voltage so as to prevent an undulation arising in the power supply voltage from appearing in the output voltage.