Stand alone lamp filament preheat circuit for ballast

Details Stand alone lamp filament preheat circuit for ballast Stand alone lamp filament preheat circuit for ballast

H - Electricity

05

B

H05B 41/295 (2006.01)

Patent

CA 2720940

A lamp filament preheating circuit using modified flyback topology which gives pulsating AC in the secondary of the flyback transformer. The circuit may be controller based or implemented by a monoshot and astable multivibrator. A self-oscillation, parallel resonant current fed half bridge inverter circuit may include an arc sensing circuit.

L'invention porte sur un circuit de préchauffage de filament de lampe utilisant une topologie de balayage modifiée qui donne un courant alternatif AC pulsé dans le secondaire du transformateur de balayage. Le circuit peut être à base de contrôleur ou mis en uvre par un monostable et un multivibrateur astable. Un circuit inverseur demi-pont alimenté en courant résonant parallèle peut comprendre un circuit de détection d'arc.

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