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:
Jan. 19, 2010
Filed:
Sep. 21, 2007
Michael Thomas Madigan, Cary, NC (US);
Michael Thomas Madigan, Cary, NC (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A power equalization circuit in a transformer-based device having a plurality of isolated voltage outputs is provided. The circuit comprises: a threshold detection circuit configured to receive an error signal derived from a selected voltage at one of the isolated voltage outputs, and to determine whether the selected voltage is above a voltage threshold based on the error signal; a timer circuit configured to activate a wait signal after a maximum voltage drift time has expired since the selected voltage rose above the voltage threshold, and to activate a wink signal coincident with the wait signal; an overdrive current source configured to drive an error current to an overdriven value in response to the wait signal; and a commutator circuit connected to a transistor winding associated with the selected isolated voltage output, the commutator being configured to connect a transformer secondary winding to ground in response to the wink signal.