Discharge lamp operation apparatus

Details Discharge lamp operation apparatus Discharge lamp operation apparatus

2005-11-08

2005-11-08

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S2090SC, C315S219000, C315S308000, C315S224000, C315SDIG002, C315SDIG002

Reexamination Certificate

active

06963176

ABSTRACT:
A discharge lamp operation apparatus includes an AC power supply (10), a voltage converting circuit (11), an inverter circuit (13), a load circuit (15), a controller (1), and a pulse voltage superimposing section (3). The pulse voltage superimposing section (3) controls the switching elements (Q3, Q4) of the inverter circuit (13) to superimpose a pulse voltage to the voltage applied across the discharge lamp (LA). The period until the discharge lamp (LA) is lighted is divided into a preheating period to preheat the discharge lamp and a startup period to start the discharge lamp. During the startup period, the controller (1) raises gradually the output voltage (Vdc) of the voltage converting circuit (11), and the voltage superimposing section (3) superimposes the pulse voltage on the voltage applied across the discharge lamp (LA).

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English Language Abstract of JP 1-167998.
English Language Abstract of JP 5-190291.
English Language Abstract of JP 2-126598.
English Language Abstract of JP 4-253195.
English Language Abstract of JP 4-212298.
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