Discharge lamp lighting apparatus

Details Discharge lamp lighting apparatus Discharge lamp lighting apparatus

2008-01-01

2008-01-01

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S308000

Reexamination Certificate

active

07315133

ABSTRACT:
A discharge lamp lighting apparatus is provided which includes: a high-voltage transformer; a switching circuit to drive the primary side of the transformer; a frequency changing means to change an operating frequency of the switching circuit according to lighting conditions of a discharge lamp; and first and second resonant circuits formed respectively at the primary and secondary sides of the transformer and having respective specific resonant frequencies different from each other. The switching circuit, before the discharge lamp is turned on, operates at a frequency ranging in proximity of the series resonant frequency of the secondary resonant circuit, and after the discharge lamp is turned on, operates at a frequency ranging in proximity of a frequency at which a voltage-current phase difference at the primary side of the transformer is minimized. The capacitance component of the second resonant circuit is constituted by a parasitic capacitance only.

REFERENCES:
patent: 7141937 (2006-11-01), Kumagai et al.
patent: 2003/0161164 (2003-08-01), Shannon et al.
patent: 2004/0240234 (2004-12-01), Toda et al.
patent: A 2005-38683 (2005-02-01), None

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