Electronic lamp ballast with driving frequency between load reso

Details Electronic lamp ballast with driving frequency between load reso Electronic lamp ballast with driving frequency between load reso

1994-12-12

1996-06-18

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315209R, 315244, 315307, 315324, 315DIG7, H05B 3702

Patent

active

055281176

ABSTRACT:
The load circuits for the different lamps of a 2-lamp ballast are selected to have sufficiently different resonant frequencies so that the luminous fluxes of the two are different when the ballast operating frequency is at one of the resonant frequencies. The ballast is operated at a frequency between those two resonant frequencies. The circuit may include a device for measuring the ratio between the luminous fluxes of the two lamps, and the frequency control circuit is then responsive to that ratio.

REFERENCES:
patent: 4538093 (1985-08-01), Melai
patent: 5068571 (1991-11-01), Schoofs
patent: 5214355 (1993-05-01), Nilssen
patent: 5365151 (1994-11-01), Spiegel et al.
patent: 5414327 (1995-05-01), Reijnaerts

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