(19)
(11) EP 1 528 841 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.07.2005 Bulletin 2005/27

(43) Date of publication A2:
04.05.2005 Bulletin 2005/18

(21) Application number: 04256681.0

(22) Date of filing: 28.10.2004
(51) International Patent Classification (IPC)7H05B 33/08
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 31.10.2003 GB 0325514

(71) Applicant: Anytronics Limited
Horndean Hampshire PO8 0BL (GB)

(72) Inventor:
  • Crawford, J. Michael, c/o Anytronics Limited
    Horndean Hampshire P08 0BL (GB)

(74) Representative: Want, Clifford James et al
Harrison Goddard Foote 40-43 Chancery Lane
London WC2A 1JA
London WC2A 1JA (GB)

   


(54) Lighting control


(57) A lighting system is controlled by lighting control apparatus 40 dependent on a received input signal 41 representing a required perceived illumination level. The lighting control apparatus comprising a sigma-delta converter having an input filter 47 for providing a filtered input signal 411 from the input signal 41 to a precision comparator 44 for comparing the filtered input signal with a feedback input signal 451 from a system model module 45 simulating an effect of the input signal on the lighting system. A resultant perceived illumination level is compared with the required perceived illumination level, and the precision comparator provides an output signal 42 for controlling a power supply 43 to the lighting system 46 to provide the required perceived illumination level.







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