Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1999-01-12
2000-10-31
Wong, Don
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315209R, 315362, 315DIG7, G05F 100
Patent
active
061407798
ABSTRACT:
A lighting system for a fluorescent lamp includes an inverter circuit having a pair of outputs between which is connected a resonant circuit of an inductor and a capacitor in series, with the discharge lamp connected in parallel with the capacitor. An inversely frequency dependent voltage is applied between the lamp electrodes according to a predefined resonance characteristic. During a preheat period, which precedes a lightup period during which the lamp is to be lit up with the commencement of an electric discharge between the lamp electrodes, the voltage is made lower in the first half than in the second, thereby averting the sudden flow of a large preheating current through the filamentary lamp electrodes.
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Kanazawa Masaki
Nakamichi Hideki
Sou Hironobu
Sanken Electric Co. Ltd.
Tran Thuy Vinh
Wong Don
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