Ballast with efficient filament preheating and lamp fault...

Details Ballast with efficient filament preheating and lamp fault... Ballast with efficient filament preheating and lamp fault...

H - Electricity

05

B

H05B 41/298 (2006.01) H05B 41/295 (2006.01)

Patent

CA 2388213

A ballast (10) for powering a gas discharge lamp (20) having heatable filaments (22,24) includes a filament heating and protection circuit (300) that provides preheating of the filaments, efficiently reduces the filament heating power after the lamp ignites, quickly responds to removal or failure of the lamp in order minimize power dissipation in the ballast, and operates a replaced lamp without requiring cycling of the power to the ballast. In a preferred embodiment, filament heating and protection circuit (300) includes a transformer (400), a switching circuit (600), a turn-on circuit (700), and a lamp- out detection circuit (800).

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