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:
May. 28, 2013
Filed:
Feb. 02, 2011
Magnus Karlsson, Oskarshamn, SE;
Henrik Borgengren, Kalmar, SE;
Anders Kullman, Kalmar, SE;
Jonas Malmberg, Farjestaden, SE;
Fredrik Wahledow, Farjestaden, SE;
Magnus Karlsson, Oskarshamn, SE;
Henrik Borgengren, Kalmar, SE;
Anders Kullman, Kalmar, SE;
Jonas Malmberg, Farjestaden, SE;
Fredrik Wahledow, Farjestaden, SE;
Telefonaktiebolaget L M Ericsson (Publ), Stockholm, SE;
Abstract
A switched mode power supply (SMPS) comprising a feedback unit, voltage feed forward (VFF) compensation signal generator and a transient detector. A VFF compensation signal is only applied to the output of the feedback unit when a transient is detected by the transient detector on the input voltage of the SMPS, thereby saving power and computation time. The transient detector comprises a first comparator to detect that a positive transient has occurred if a difference signal is greater than a positive threshold level; a second comparator to determine if the difference signal is within a predetermined range of positive values and output a result that indicates if the difference signal is within the predetermined range of positive values; and a first calculator to detect that a positive transient has occurred if, out of a first predetermined number of consecutive results of the output of the second comparator, there is at least a second predetermined number of results indicating that the difference signal is within the predetermined range of positive values. The transient detector comprises further features for similarly detecting a negative transient.