Patent ID: 8355268

Claim:
An electronic driver circuit for supplying an electronic load (LED 1 , LED 2 , . . . LEDn) with a DC current or voltage (V load ), comprising: an AC input (L, N) for receiving an AC input voltage (V mains ), two buck-boost converters ( 10 , 20 ) for alternately operating as rectifier for rectifying said AC input voltage (V mains ) and as DC/DC converter for DC, conversion of said rectified AC input voltage, a control unit ( 11 , 12 , 13 , 21 , 22 , 23 ; 40 ) for monitoring the zero crossing of the AC input voltage (V mains ) and for controlling said two buck-boost, converters ( 10 , 20 ) 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.