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:
Apr. 06, 2004
Filed:
Apr. 29, 2002
James P. Noon, Merrimack, NH (US);
Alexander Borisovich Uan-Zo-Li, Blacksburg, VA (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
The present invention provides an apparatus and method for reducing the voltage stress in a single-stage single-switch (SSSS) converter by modulating the predetermined operating frequency of the converter lower responsive to increasing voltage stress. A control circuit ( ) and associated cooperable frequency setting capacitance (CT) and resistance (RT) are coupled to the primary circuit ( ) and the secondary circuit ( ) of the SSSS converter via a switch ( ). A frequency foldback device ( ) is coupled to CT or RT and cooperable therewith to lower bus voltage stress by modulating the switch frequency. The operating frequency is modulated (i.e. reduced) from the predetermined operating frequency upon detection of a voltage threshold transition.