Patent ID: 6100642
Filing Date: 2000-08-08
Classification: H05B,Y10S

Abstract:
A discharge lamp operating device comprising:a direct-current power supply for outputting direct-current power obtained by rectifying an alternating-current input voltage;a booster circuit for converting the direct-current power provided by said direct-current power supply into a predetermined operating voltage;a self-excitatory inverter for converting the predetermined operating voltage provided by said booster circuit into a predetermined high frequency signal; anda lamp operating circuit for converting the predetermined high-frequency signal from said self-excitatory inverter into sine waves to light a discharge lamp;said lamp operating circuit comprising:a hot-cathode discharge lamp having first and second filaments which face each other said first filament comprising first and second pole points and said second filament comprising third and fourth pole points,a resonant capacitor connected to said discharge lamp in parallel;first and second thermionic emission path dispersing diodes which are connected in opposing directions between said resonant capacitor and said third and fourth pole points of said second filament in order to allow a first current provided by said self-excitatory inverter to flow to said first filament via said second thermionic emission path diode and said resonant capacitor and to prevent the first current from flowing to said second filament; andthird and fourth thermionic emission path dispersing diodes which are connected in opposing directions between said resonant capacitor and said first and second pole points of said first filament in order to allow a second current provided by said self-excitatory inverter to flow to said second filament via said fourth thermionic emission path dispersing diode and said resonant capacitor and to prevent the second current from said self-excitatory inverter from flowing to said first filament.