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:
Jul. 29, 2008
Filed:
Feb. 15, 2006
Takeshi Uematsu, Tokyo, JP;
Takeshi Uematsu, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A power supply device has first and second terminals, a transformer, a switching element and an auxiliary power supply element. The first and second terminals receive input power having an input voltage. The transformer has a primary winding and a secondary winding. The primary winding has a pair of winding terminals. One of the pair of winding terminals is connected to the first terminal. The switching element is connected between the second terminal and the other of the pair of winding terminals of the primary winding. The auxiliary power supply element feeds electric power to the transformer when the input voltage decreases to or less than a predetermined value. The auxiliary power supply element has a capacitor and a second switching element for storing energy from the primary winding into the first capacitor during a normal operation of the power supply device.