公开(公告)号：EP2630843B1

公开(公告)日：2014-12-10

申请号：EP11776575.0

申请日：2011-10-13

申请人： Koninklijke Philips N.V. ,  Philips Intellectual Property & Standards GmbH

发明人： RADERMACHER, Harald, Josef, Günther ,  LÓPEZ, Toni ,  WENDT, Matthias

IPC分类号： H05B33/08

CPC分类号： H05B33/08 ,  H05B33/0824

公开(公告)号：EP2630843A1

公开(公告)日：2013-08-28

申请号：EP11776575.0

申请日：2011-10-13

申请人： Koninklijke Philips Electronics N.V. ,  Philips Intellectual Property & Standards GmbH

发明人： RADERMACHER, Harald, Josef, Günther ,  LÓPEZ, Toni ,  WENDT, Matthias

IPC分类号： H05B33/08

CPC分类号： H05B33/08 ,  H05B33/0824

摘要： The invention relates to a LED circuit arrangement (1) with at least a voltage input (4), adapted to provide an operating voltage, a reactive element (6) connected in series with said voltage input (4) and a LED light source (3). To enable the LED circuit arrangement (1) to be driven at an operating voltage, the LED light source (3) comprises a first and a second LED unit (8, 9), each having one light emitting diode, controllable switching means (10) to connect said LED units (8, 9) with said reactive element (6) in a low voltage mode and a high voltage mode and a control unit (12). The LED light source (3) shows a first forward voltage in said low voltage mode and a second forward voltage in said high voltage mode, said second forward voltage being higher than said first forward voltage. The control unit (12) is adapted to control the current through the LED light source (3) by setting the switching means (10) to said low voltage mode when the current, supplied to the LED light source (3), corresponds to a first threshold value (30) and by setting the switching means (10) to the high voltage mode when said supplied current corresponds to a second threshold value (31).