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:
Nov. 04, 2008
Filed:
Jun. 01, 2006
David M. Garner, London, GB;
David Robert Coulson, Comberton, GB;
Devarahandi Indika Mahesh DE Silva, Cambridge, GB;
Jayaraman Kumar, Cambridge, GB;
Vinod A. Lalithambika, Cambridge, GB;
David M. Garner, London, GB;
David Robert Coulson, Comberton, GB;
Devarahandi Indika Mahesh de Silva, Cambridge, GB;
Jayaraman Kumar, Cambridge, GB;
Vinod A. Lalithambika, Cambridge, GB;
Cambridge Semiconductor Limited, Cambridge Cambridgeshire, GB;
Abstract
This invention relates to SMPS controllers employing primary side sensing to detect a point of zero magnetic flux, at which the output voltage of the SMPS may be sampled accurately on the primary side. We describe a switch mode power supply (SMPS) controller for regulating the output voltage of an SMPS is response to a feedback signal from an auxilliary winding of a magnetic energy storage device forming part of an output circuit of the SMPS, the SMPS controller comprising: a reference level input to receive an output reference level signal; an input to receive said feedback signal, said feedback signal being responsive to a voltage on said auxilliary winding of said magnetic energy storage device; an integrator to integrate a difference between said feedback signal and a first fixed reference level signal; a first comparator to compare an output of said integrator with a second fixed reference level signal and to provide an output responsive to said comparison for regulating said SMPS output voltage.