Discharge lamp ballast circuit with duty cycle dimming control

Details Discharge lamp ballast circuit with duty cycle dimming control Discharge lamp ballast circuit with duty cycle dimming control

1998-02-11

2000-06-20

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315307, 315209R, 315DIG5, 315DIG7, 315244, G05F 100

Patent

active

060781475

ABSTRACT:
A circuit for supplying a discharge lamp, comprising a converter for generating a high-frequency current at a frequency f from a supply voltage and a circuit portion I for adjusting the power consumed by the discharge lamp through adjustment of the frequency. The circuit portion I is provided with a circuit portion II for low-frequency square-wave modulation of the frequency f and for the adjustment of the duty cycle of the square-wave modulation. As a result, the discharge lamp can be dimmed over a very wide range without striations or moding occurring and without undesirable shifts in the color point of the light.

REFERENCES:
patent: 4358716 (1982-11-01), Cordes et al.
patent: 4373146 (1983-02-01), Bonazoli et al.
patent: 4677345 (1987-06-01), Nilssen
patent: 5003230 (1991-03-01), Wong et al.
patent: 5365151 (1994-11-01), Spiegel et al.
patent: 5410221 (1995-04-01), Mattas et al.
patent: 5414327 (1995-05-01), Reijnaerts
patent: 5528117 (1996-06-01), Buij et al.
patent: 5550722 (1996-08-01), Bouwman et al.

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