Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1997-12-01
1999-08-17
Wong, Don
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315 94, 315105, 315307, 315DIG4, G05F 100
Patent
active
059398361
ABSTRACT:
A discharge lamp lighting apparatus of the present invention includes an inverter to convert input DC voltage into high frequency voltage and supply the converted high frequency voltage to a discharge lamp having filaments, a preheating circuit to preheat the filaments of the discharge lamp, filament voltage detecting circuits to detect voltage applied between both ends of the filaments of the discharge lamp, and an output control circuit to control the inverter to stop or lower the output of high frequency voltage when the detected result of the filament voltage detecting circuit exceeds a specified value.
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Mita Kazutoshi
Nakaya Fuminori
Shimizu Keiichi
Uratani Kazuyuki
Lee Wilson
Toshiba Lighting & Technology Corp.
Wong Don
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