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:
Feb. 16, 2016
Filed:
Apr. 27, 2012
Jamie Kelly, North Shields Tyne & Wear, GB;
Deepak Makwana, Newcastle Upon Tyne, GB;
Jamie Kelly, North Shields Tyne & Wear, GB;
Deepak Makwana, Newcastle Upon Tyne, GB;
TRIDONIC GMBH & CO KG, Dornbirn, AT;
Abstract
A power factor correction circuit includes an inductor L, a diode D, a switch Qand a controller. An input voltage Vis applied to the inductor Lwhich is cyclically discharged through the diode Dby the operation of the switch Q. The method of operation includes: operating a controllerto obtain an indication of the voltage across the switch Q, monitoring the indication of the voltage across the switch Qto determine when the inductor Lreaches a discharged state in response to the switch being in an off state, and the switch Qbeing controlled by the controllerto vary the on period of the switch Q, during which the inductor is charged, for adjusting an output voltage Vtowards a target value V. The controllermonitors at least one of the indication of the voltage across the switch Qand the ratio of the switch on period Tto the switch off period Tfor detecting that the input voltage Vhas a low value.