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. 17, 2019
Filed:
Apr. 10, 2019
Tdk Corporation, Tokyo, JP;
Ken Matsuura, Tokyo, JP;
Min Lin, Tokyo, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
A switching power supply includes a power converter with an inductor and first and second switches that converts a voltage Vac to a voltage Vdc, a detector with a winding that detects zero timing of an inductor current, and a driving signal generator that switches on the second switch based on the zero timing and then switches on the first switch. The driving signal generator ends a period Tbefore the zero timing by executing a measuring process for an on period Tof the second switch, a process that calculates the period Tfrom T=T×|Vac|/(Vdc−|Vac|)−Tc using a correction time Tc, a process that switches on the first switch for only the period T, a process that measures an elapsed time between the periods Tand T, and a process that changes the correction time Tc so that the elapsed time becomes a target time.