Discharge-lamp control device

Details Discharge-lamp control device Discharge-lamp control device

2007-05-15

2007-05-15

Phan, Tho (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S291000, C315S224000, C315S219000, C315S212000, C315S307000, C315S276000, C315S239000

Reexamination Certificate

active

11254105

ABSTRACT:
A discharge-lamp control device for lighting a discharge-lamp includes two electrodes, first and second driving units to supply power to the discharge-lamp through the electrodes, respectively. Each driving unit includes a transformer having primary and secondary coils and a capacitor connected in parallel to the secondary coil. The first driving unit has impedance characteristics with a minimum impedance at a first frequency and a maximum impedance at a second frequency lower than the first frequency. The second driving unit has impedance characteristics having a minimum impedance at a third frequency and a maximum impedance at a fourth frequency lower than the third frequency. The first frequency is set to be higher than the third frequency. The second frequency is set to be lower than the fourth frequency. An operating frequency of the driving circuit is selected within a frequency bandwidth from the fourth frequency to the third frequency.

REFERENCES:
patent: 5500792 (1996-03-01), Jeon et al.
patent: 5864267 (1999-01-01), Hatada et al.
patent: 6396719 (2002-05-01), Morita et al.
patent: 6630797 (2003-10-01), Qian et al.
patent: 7110268 (2006-09-01), Yasumura
patent: A 2004-241136 (2004-08-01), None

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