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:
Sep. 19, 2017
Filed:
Apr. 22, 2015
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Hisato Hosoyama, Yokohama, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A power supply device comprising: a switching power supply unit which operates in accordance with a PWM signal; and a controller configured to generate the PWM signal, the controller includes: a switching frequency control unit configured to generate a spreading spectrum signal whose period is changed, an output voltage detecting unit configured to detect an output voltage of the switching power supply unit, a reference voltage unit configured to generate a reference voltage, a difference computing unit configured to calculate a difference between the output voltage and the reference voltage, a compensator configured to generate a compensating value from an input voltage of the switching power supply unit, the reference voltage, and the period of the spreading spectrum signal, and a PWM generator configured to generate the PWM signal from the spreading spectrum signal and the compensating value.