Lamp protective, electronic ballast

Details Lamp protective, electronic ballast Lamp protective, electronic ballast

H - Electricity

05

B

H05B 41/30 (2006.01) H05B 41/298 (2006.01)

Patent

CA 2214226

A lamp protective, electronic ballast includes a lamp voltage detector having a capacitor (112, 145, 165) and resistor (110, 142, 163) series connected across a discharge lamp (73). The junction of the resistor and capacitor is coupled to a voltage sensitive switch (114, 147, Q8/Q12) for detecting DC offset on the lamp and excessive AC voltage on the lamp. The switch is more sensitive to DC offset than to excessive AC voltage and is disabled while the lamp is started.

Résistance-ballast électronique de protection de lampe comprenant un détecteur de tension de lampe comportant un condensateur (112, 145, 165) et une résistance (110, 142, 163) en série, reliés dans la lampe à décharge (73). La jonction de la résistance et du condensateur est reliée à un commutateur sensible à la tension (114, 147, Q¿8?/Q¿12?) qui capte le décalage en continu sur la lampe et la tension excessive de courant alternatif appliqué à la lampe. Le commutateur est plus sensible au décalage en continu qu'à l'excès de tension alternative et il se met hors fonction une fois que la lampe est en marche.

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