Controlled electronic ballast

Details Controlled electronic ballast Controlled electronic ballast

1988-05-02

1990-09-04

LaRoche, Eugene P.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315205, 315209R, 315244, 315208, 315307, 315297, 315DIG7, H05B 3702, H05B 3904, G05F 100

Patent

active

049547542

ABSTRACT:
A fluorescent lamp is connected in parallel with a resonant L-C circuit powered by a series-applied high frequency voltage from a self-oscillating inverter power supply. The frequency of the series-applied voltage is about 33 kHz during the brief initial period before the lamp ignites, but falls to about 30 kHz after the lamp has ignited. As a result, the detuning taking place in the L-C resonant circuit due to changing parallel-loading is compensated-for by correspondingly changing the frequency of the series-applied voltage. This detuning effect is particularly pronounced in situations where there is a large magnitude-ratio between the lamp's ignition voltage and its operating voltage.

REFERENCES:
patent: 4060752 (1977-11-01), Walker
patent: 4346332 (1982-08-01), Walden
patent: 4388561 (1983-06-01), Koshimura et al.
patent: 4395659 (1983-07-01), Aoike et al.
patent: 4553070 (1985-11-01), Sairanen et al.
patent: 4560908 (1985-12-01), Stupp et al.
patent: 4647817 (1987-03-01), Fahnrich et al.
patent: 4701671 (1987-10-01), Stupp et al.

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