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. 04, 2000
Filed:
Jun. 08, 1999
Thomas Durbaum, Aachen, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A switched mode power supply includes a transformer having a primary winding and a secondary winding. A primary current flows through the primary winding during a first time period and a secondary current flows through the secondary winding during a second time period. A first switching device is connected in series to the primary winding, and a second switching device is connected in series to the secondary winding. In addition, the power supply includes primary and secondary control units. The secondary-side control unit switches the second switching device to control the power supply output by changing the energy returning back to the transformer during the second period of time. The primary-side control unit switches the first switching device to limit the supplied energy supplied by the transformer during the first period of time toward the input of the switched mode power to a predetermined value. This eliminates the need for transmission of a control signal from the secondary side to the primary side where DC decoupling is necessary.