Discharge lamp lighting circuit

Details Discharge lamp lighting circuit Discharge lamp lighting circuit

2007-05-15

2007-05-15

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S276000, C315S279000, C315S2090SC

Reexamination Certificate

active

11371719

ABSTRACT:
A control section is used to control a DC-to-AC converter circuit to perform lighting control of a discharge lamp. A transformer, switching elements, and a capacitor for resonance are included. The switching elements are driven and serial resonance of the capacitor and the inductance component of the transformer or an inductance element is produced. Before the discharge lamp is turned on, control is performed to cause the driving frequency of the switching elements to gradually approach Foff and to supply a start signal to the discharge lamp. Once the discharge lamp is turned on, control is performed to continuously change the driving frequency from f1assumed before the discharge lamp is turned on to f2. A residence time in a frequency range lower than Fon is secured then the frequency is shifted to a frequency range fb higher than Fon, or an inductive range fb.

REFERENCES:
patent: 2005/0062443 (2005-03-01), Ohta et al.
patent: 7-142182 (1995-06-01), None

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