Electric lamp and discharge devices: systems – Plural power supplies – Discharge device and/or rectifier in one of the supply circuits
Patent
1986-07-07
1989-04-04
Moore, David K.
Electric lamp and discharge devices: systems
Plural power supplies
Discharge device and/or rectifier in one of the supply circuits
315172, 315174, 315176, 315 33, 315206, 315208, H05B 3700
Patent
active
048189170
ABSTRACT:
A ballasting circuit for fluorescent lamps includes a series-connected current limiting ballast element and an electronic assist circuit. The ballast element has a high voltage side connectable to a commercial 110 VAC/60 hertz power source and a low voltage side connected in series with the lamp. The electronic assist circuit has a full wave bridge rectifier input means connected to the low voltage side of the ballast element and a transformer output means connected in series between the ballast element and the lamp. The electronic assist circuit generates a relatively high frequency, high voltage excitation signal prior to lamp conduction to assist in starting the lamp. After lamp conduction begins, the low voltage side of the ballast element drops to the normal operating voltage of the lamp and the excitation signal amplitude correspondingly drops, but is not eliminated, so as to maintain lamp operation with low frequency power supplied from the commercial power source.
REFERENCES:
patent: 3544839 (1970-12-01), Fahnrich
patent: 4187448 (1980-02-01), Kuroi et al.
Moore David K.
Powell Mark R.
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