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:
Feb. 24, 2004
Filed:
Jun. 12, 2002
Pentti Nieminen, Helsinki, FI;
Nokia Corporation, Espoo, FI;
Abstract
A direct-current converter converts an input voltage into an output voltage. It has and which comprises an operating voltage source, a power transformer having a primary side and secondary side, an input voltage source connected to the power transformer, at least one first power switch disposed on the primary side, and at least one second power switch disposed on the secondary side and rectifying the output voltage. The direct-current converter also has a regulating circuit, which is connected to the first power switch and the second power switch to control the timing of their switching functions, and an auxiliary power source arranged to supply power to the regulating circuit and connected to the operating voltage.