H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/04 (2006.01)
Patent
CA 2187218
The invention concerns a circuit arrangement for starting a high intensity discharge lamp requiring energy in the form of ignition pulses being provided to the lamp prior to and substantially throughout the glow load of the lamp. An ignitor comprised by the circuit arrangement includes a bilateral switching device such as, but not limited to, a SIDAC having a breakover voltage corresponding to the lamp voltage during the lamp glow mode. The circuit arrangement substantially eliminates the lamp remaining in its glow mode for a prolonged period of time thereby minimizing the possibility of lamp destruction from damage to the lamp electrodes.
L'invention concerne un système de circuit pour allumer une lampe à décharge haute intensité sous la forme d'impulsions d'allumage fournies à la lampe avant et sensiblement pendant toute la durée d'incandescence de la lampe. L'allumeur présent dans le circuit comprend un dispositif bilatéral de commutation du type SIDAC ayant une tension d'amorçage correspondant à la tension de la lampe lorsque la lampe est en mode d'incandescence. Le système de circuit évite sensiblement que la lampe reste dans son mode incandescent pendant une durée de temps prolongée, ce qui minimise la possibilité d'une destruction de la lampe consécutive à une détérioration des électrodes de la lampe.
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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