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:
Mar. 06, 2012
Filed:
Apr. 12, 2007
Michael Zimmermann, Heiligenkreuz, CH;
Michael Zimmermann, Heiligenkreuz, CH;
Tridonicatco Schweiz AG, , CH;
Abstract
An operating circuit for at least one light-emitting diode (LED) incorporates a switched-mode regulator circuit to which a DC voltage is fed and which provides a supply voltage for the at least one light-emitting diode (LED) by means of a coil (L) and a switch (S) clocked by a control unit (SR). When the switch (S) is on, energy is built up in the coil (L), which is discharged through the at least one light-emitting diode (LED) when the switch (S) is off. The control unit (SR) determines the time period between the switch (S) switching off and subsequently switching on depending on the voltage across the at least one light-emitting diode (LED) and a temporally constant characteristic parameter of the coil (L).