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:
Jun. 13, 2017
Filed:
May. 19, 2014
Osram Gmbh, Munich, DE;
Maximilian Schmidl, Pullach, DE;
Joachim Muehlschlegel, Groebenzell, DE;
OSRAM GmbH, Munich, DE;
Abstract
A circuit arrangement includes a converter having a converter switch and a driver for the converter switch. The driver includes an interface coupling to a dimming apparatus supplying a dimming value. The driver provides an RF signal with a duty ratio at the output of the driver. The driver modifies the RF signal by superposition of a PWM signal such that, in correlation with the supplied dimming value, a predefinable number of periods of the RF signal is chopped from the RF signal. The driver is configured to reduce the duty ratio of the RF signal during at least one predefinable period of the RF signal in order to adjust levels of dimming which correspond to dimming values which are between a first and a second dimming value which differ from one another by at least one period of the RF signal.