Circuit arrangement

Details Circuit arrangement Circuit arrangement

H - Electricity

05

B

H05B 37/03 (2006.01) H05B 41/298 (2006.01) H05B 41/36 (2006.01)

Patent

CA 2046367

PHA 21.607 20.02.1991 Abstract Circuit arrangement. The invention relates to a circuit arrangement suitable for operating two fluorescent lamps (11, 12), comprising a ballast means (I) for providing power to said two fluorescent lamps to illuminate them, said ballast means providing power for pre- ignition heating, for ignition and for post-ignition operation of said lamps, said ballast means being operable to attempt to ignite said lamps repeatedly should they fail to ignite. According to the invention, the circuit arrangement also comprises sensing means (I(11)) for causing said ballast means to cease trying to ignite said lamps after a predetermined time during which at least one of the fluorescent lamps has failed to ignite. This prevents flashing of one of the lamps for more than this predetermined time, if one of the lamps has deteriorated. figure 1

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