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:
Aug. 19, 2003
Filed:
Jul. 10, 2002
Matti Sula, Koski TL, FI;
Salcomp Oy, Kemijarvi, FI;
Abstract
A switched-mode power supply has primary and secondary sides, and a transformer (M ) with a primary winding, a secondary winding and an auxiliary winding. The primary winding and the auxiliary winding are connected to the primary side, and the secondary winding is connected to the secondary side. A switch element (T ) is connected to the primary winding in order to interrupt a current flowing in the primary winding. The switched-mode power supply contains a freely oscillating circuit (R , C , R , T , T , R , R , R , R ) for generating switching pulses to the switch element (T ). A rectifying and charge storing coupling (D , C ) is connected between the terminals of the auxiliary winding in order to generate such an image voltage which on the primary side represents a certain voltage of the secondary side. The switched-mode power supply further contains a coupling (D , R ) from said rectifying and charge storing coupling (D , C ) to said freely oscillating circuit (R , C , R , T , T , R , R , R , R ) in order to control how switching pulses are generated on the basis of the value of said image voltage.