Lighting circuit and lighting device

Details Lighting circuit and lighting device Lighting circuit and lighting device

1999-04-16

2000-01-25

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315244, 315209R, 315247, 315DIG2, 363 34, 363 47, G05F 100

Patent

active

060182210

ABSTRACT:
The present invention provides an improved power factor and lower harmonic distortion in the power supply circuit of a high frequency discharge lamp. An "extra" circuit path is provided so that the driving power to the lamp will "see" a load that significantly reduces the harmonic distortion and tends to cause the power factor to approach "1". In a preferred embodiment of the invention this is accomplished by providing a third capacitor with which the load circuit forms an in-series resonance circuit with the discharge lamp and its associated current-limiting inductance. The new circuit arrangement provides a high frequency current passage not provided in known lighting circuits of this type that raises the power factor and lowers harmonic distortion.

REFERENCES:
patent: 4291254 (1981-09-01), Arlt et al.
patent: 4564897 (1986-01-01), Okamoto et al.
patent: 5691605 (1997-11-01), Xia et al.
patent: 5841241 (1998-11-01), Nilssen

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