Discharge lamp ballast device and lighting appliance

Details Discharge lamp ballast device and lighting appliance Discharge lamp ballast device and lighting appliance

2005-11-29

2008-10-14

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S224000, C315S293000, C315S299000, C315S360000

Reexamination Certificate

active

07436123

ABSTRACT:
An inverter controller dives an inverter to operate at a switching frequency selectively from one of a preheating frequency (f1), a starting frequency (f2), and a lighting frequency (f3) which are different from each other, thereby giving a preheating mode, a starting mode, and a lighting mode. A reset means is provided to make the starting mode upon lowering of a voltage supplied to the inverter below a first threshold, while an inverter stop means is provided to stop the inverter upon detection of abnormality of a discharge lamp. A timer generates a signal determining the start of the preheating, starting, and/or lighting modes, and generates a reset signal disable signal for disabling the reset means, an inverter stop disable signal for disabling the inverter stop means. The inverter controller includes a frequency sweep means for varying the switching frequency gradually from the starting frequency to the lighting frequency. The timer disables the reset means only during a period starting from the selection of the preheating frequency and ending when the switching frequency varies to the lighting frequency, and disable the inverter stop means only during a period starting from the selection of the preheating frequency and ending when the switching frequency begins to vary from the starting frequency to the lighting frequency.

REFERENCES:
patent: 5170099 (1992-12-01), Ueoka et al.
patent: 5295036 (1994-03-01), Yagi et al.
patent: 6127788 (2000-10-01), Yamamoto et al.
patent: 6515431 (2003-02-01), Moo et al.
patent: 6949885 (2005-09-01), Hamamoto et al.
patent: 2003-59681 (2003-02-01), None
patent: 2003-203795 (2003-07-01), None

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