(19)
(11) EP 0 774 884 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.12.1997 Bulletin 1997/50

(43) Date of publication A2:
21.05.1997 Bulletin 1997/21

(21) Application number: 96308257.3

(22) Date of filing: 15.11.1996
(51) International Patent Classification (IPC)6: H05B 37/03
(84) Designated Contracting States:
BE DE ES FR GB

(30) Priority: 15.11.1995 GB 9523433

(71) Applicant: Delmatic Limited
London W1P 5PN (GB)

(72) Inventor:
  • Woodnutt, John
    London W1P 5PN (GB)

(74) Representative: Robson, Aidan John 
Reddie & Grose 16 Theobalds Road
London WC1X 8PL
London WC1X 8PL (GB)

   


(54) Blown light detector


(57) A failed light detector for use in a dimmer circuit which has a control input producing a positive output when the lamp is in operation and falls to zero when the lamp fails comprises means (18) for providing a controlled voltage for a remotely addressable controlled module (22) in the range required to dim the lamp. A comparator (24) monitors the output voltage of the control input to the dimmer circuit to detect whether the lamp has failed and a lamp failure signal is provided by this in dependents on the measured voltage.






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