Discharge lamp lighting device and lighting unit

Details Discharge lamp lighting device and lighting unit Discharge lamp lighting device and lighting unit

2007-05-01

2007-05-01

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Time-controlled

C315S307000, C315S291000, C315S362000, C315S2090SC, C315S244000

Reexamination Certificate

active

11302356

ABSTRACT:
A resonance load circuit is supplied with the high-frequency voltage from the inverter circuit, and includes an inductor, a capacitor and a discharge lamp. The resonance load circuit is so that a declination with respect to the lighting frequency fs is set to a range from −20° to 40° in impedance when the discharge lamp is operating at rating. The CPU continuously generates a pulse voltage for driving on and off the switch elements at a cycle shorter than a lighting cycle of the discharge lamp based on program data and data stored in a memory, and makes pulse-width modulation with respect to an on-state width of the pulse voltage in accordance with a waveform change of a sinusoidal voltage corresponding to the lighting cycle, and further, supplies an approximately sinusoidal current to the discharge lamp using a high-frequency output from the inverter circuit.

REFERENCES:
patent: 5142203 (1992-08-01), Oda et al.
patent: 5804924 (1998-09-01), Ohnishi et al.
patent: 5828187 (1998-10-01), Fischer
patent: 2006/0132044 (2006-06-01), Takahashi et al.
patent: 2-202365 (1990-08-01), None
patent: 10-243661 (1998-09-01), None
patent: 11-220889 (1999-10-01), None
patent: 2001-52889 (2001-02-01), None
patent: 2002-324688 (2002-11-01), None
patent: 2003-224981 (2003-08-01), None

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