Electronic driver circuit and method,申请号US20090863991-传众专利搜索

Electronic driver circuit and method

申请公布号：US8355268(B2)

申请号：US20090863991

申请日期：2009.01.26

申请公布日期：2013.01.15

申请人：

KONINKLIJKE PHILIPS ELECTRONICS N.V.;BOEKE ULRICH

发明人：BOEKE ULRICH

分类号：H02J1/10

主分类号：H02J1/10

摘要：The present invention relates to an electronic driver circuit and a corresponding method for supplying an electronic load (LED1, LED2, . . . , 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 (Vmains), two buck-boost converters (10, 20) for alternately operating as rectifier for rectifying said AC input voltage (Vmains) 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 (Vmains) 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.