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. 12, 2017
Filed:
May. 10, 2016
Fuji Electric Co., Ltd., Kanagawa, JP;
Tetsuya Kawashima, Nagano, JP;
FUJI ELECTRIC CO., LTD., Kanagawa, JP;
Abstract
A switching controller includes an output voltage detector that detects the output voltage of a switching power supply, a compensator, a frequency setter, a frequency sweeper, and a voltage control oscillator that are all connected in series. The switching controller also includes an ON-time generator that generates an ON time for a switching element and a pulse-width modulation signal generator that generates a pulse-width modulation signal using the output from the voltage control oscillator and the output from the ON-time generator. The frequency shifter includes a shift amount calculator that calculates a shift amount on the basis of a first coefficient that is generated by a first coefficient generator and changes as time elapses, a second coefficient generated by a second coefficient generator in accordance with the output value from the frequency setter, a third coefficient that is generated by a third coefficient generator and exhibits a different relationship with the output value from the frequency setter than the second coefficient, and the output value from the frequency setter.