Discharge lamp lighting apparatus

Details Discharge lamp lighting apparatus Discharge lamp lighting apparatus

2007-10-16

2007-10-16

Chen, Shih-Chao (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C310S316010

Reexamination Certificate

active

11340605

ABSTRACT:
The present invention provides a discharge lamp lighting apparatus for lighting a discharge lamp having two electrodes, having: a first drive circuit, a second drive circuit, and a control circuit. The first drive circuit is connectable to one of the two electrodes to supply a first alternating current to the discharge lamp. The first alternating current has a frequency and a first effective value. The second drive circuit is connectable to the other of the two electrodes to supply a second alternating current to the discharge lamp. The second alternating current has the frequency and a second effective value. The second alternating current has an opposite phase to the first alternating current. The control circuit generates first and second drive pulses to drive the first and second drive circuits, respectively. The first and second drive pulses have a phase difference therebetween. The control circuit adjusts the phase difference to match the first and second effective values.

REFERENCES:
patent: 6087757 (2000-07-01), Honbo et al.
patent: 6674251 (2004-01-01), Langeslag et al.
patent: 6759811 (2004-07-01), Okamoto et al.
patent: 6972531 (2005-12-01), Krummel
patent: 7081709 (2006-07-01), Pak
patent: 2003/0173911 (2003-09-01), Ohsawa
patent: A 2004-241136 (2004-08-01), None

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