(19)
(11) EP 2 273 851 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.05.2011 Bulletin 2011/19

(43) Date of publication A2:
12.01.2011 Bulletin 2011/02

(21) Application number: 09163687.8

(22) Date of filing: 24.06.2009
(51) International Patent Classification (IPC): 
H05B 33/08(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA RS

(71) Applicant: NXP B.V.
5656 AG Eindhoven (NL)

(72) Inventors:
  • Nguyen, Viet
    Redhill, Surrey RH1 1DL (GB)
  • Bancken, Pascal
    Redhill, Surrey RH1 1DL (GB)
  • Surdeanu, Radu
    Redhill, Surrey RH1 1DL (GB)
  • Lammers, Matheus
    Redhill, Surrey RH1 1DL (GB)
  • Deurenberg, Peter
    Redhill, Surrey RH1 1DL (GB)

(74) Representative: Burton, Nick et al
NXP Semiconductors IP&L Department Betchworth House 57-65 Station Road
Redhill, Surrey RH1 1DL
Redhill, Surrey RH1 1DL (GB)

   


(54) System and method for controlling LED cluster


(57) In one embodiment, a control system is for controlling a lighting system which comprises a cluster (20) of different colour LEDs. The control system comprises a first control unit (24) for generating amplitude values for the different LEDs of the cluster to provide a desired colour point and a second control unit (38) for controlling pulse width values for the different LEDs to provide a desired brightness. Current sources (32) are provided for individually driving the LEDs of the cluster.
This system allows the control of colour point to be independent from the control of brightness of the LED cluster. This provides a low cost solution and a fast, accurate and flexible control to a LED cluster.







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