公开(公告)号：EP2710861A1

公开(公告)日：2014-03-26

申请号：EP12725505.7

申请日：2012-05-11

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

发明人： HATTRUP, Christian ,  KAHLMAN, Henricus, Marius, Joseph, Maria ,  KURT, Ralph ,  SAUERLAENDER, Georg ,  HONTELE, Bertrand, Johan, Edward ,  TAO, Haimin

IPC分类号： H05B33/08

CPC分类号： H05B33/0824 ,  H05B33/0809 ,  H05B33/0815 ,  H05B33/083 ,  Y02B20/347

摘要： A light generating device (1) is provided with at least a voltage input (21) adapted for receiving a variable voltage, at least three LED circuits (10), coupled with said voltage input (21), wherein each LED circuit (10) comprises a LED unit (14) and controllable current regulator (15) to control the current through said LED circuit (10). The light generating device (1) further comprises a controllable switch matrix (30) comprising a plurality of switches (25, 26, 27), said switch matrix (30) is configured to operate in at least three different switching modes and a controller (50), connected at least with said switch matrix (30), configured to determine said variable operating voltage and to control the switching mode of said switch matrix (30) in dependence of the determined operating voltage. To provide an efficient operation of such device (1) with a variable operating voltage, such as an AC voltage, in a first switching mode, said LED units (10) are connected parallel to each other, in a second switching mode, at least two of said LED units (10) are connected in series and in a third switching mode, said LED units 10 are connected in series with each other.

公开(公告)号：EP2718683A1

公开(公告)日：2014-04-16

申请号：EP12730647.0

申请日：2012-06-06

申请人： Koninklijke Philips N.V.

发明人： KURT, Ralph ,  VERBRUGH, Stefan, Marcus ,  DE VRIES, Jorrit, Ernst ,  KAHLMAN, Henricus, Marius, Joseph, Maria

IPC分类号： G01J1/16 ,  G05D25/00 ,  H05B33/08

CPC分类号： H05B33/0869 ,  F21V23/0457 ,  G01J1/0425 ,  G01J1/1626 ,  G01J3/505 ,  G01J2001/4252

摘要： There is provided an arrangement for light balancing. The arrangement provides light balancing and robust flux feedback and comprises a light source array, a plurality of light sources arranged as a plurality of strings of individual light emitting diodes, at least one light guide structure, and at least one optical sensor. The arrangement provides feedback relating to the optical contribution for each one of the plurality of strings of individual light emitting diodes and is thereby maintaining the emitted light at a balanced level.