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:
Jan. 15, 2013
Filed:
Jan. 26, 2009
Ulrich Boeke, Langerwehe, DE;
Ulrich Boeke, Langerwehe, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The present invention relates to an electronic driver circuit and a corresponding method for supplying an electronic load (LED, LED, . . . , LEDn) with a DC current or voltage (Vload). To achieve a high efficiency and a low thermal stress on the electronic load, the proposed driver circuit comprises: —an AC input (L, N) for receiving an AC input voltage (V), two buck-boost converters () for alternately operating as rectifier for rectifying said AC input voltage (V) and as DC/DC converter for DC conversion of said rectified AC input voltage, a control unit () for monitoring the zero crossing of the AC input voltage (V) and for controlling said two buck-boost converters () to change their modes of operation upon detection of a zero crossing, such that during all periods one buck-boost converter operates as rectifier and the other buck-boost converter operates as DC/DC converter.