Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device
Patent
1996-12-18
1998-08-25
Lee, Benny T.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
With power factor control device
315224, 315244, 315307, 315209R, 315DIG4, H05B 4116
Patent
active
057986177
ABSTRACT:
An improved ballast circuit for use with a fluorescent lamp includes an EMI filter, a feedback network, a rectifier and voltage amplification stage, and an active resonant circuit which connects to the lamp load. The ballast circuit includes a magnetic feedback path which couples the resonant circuit to the feedback network. The magnetically coupled feedback network of the improved ballast circuit reduces the non-linear characteristics of the rectifier diodes, thus providing an almost linear load to the input power supply and therefore achieving an improved power factor, on the order of 0.95 or greater. The improved ballast circuit may also include a dimming stage which works with the active resonant circuit to vary the amount of power that is supplied to the lamp load. The dimming stage does not require the addition of parasitic active stages and thus provides a lamp with high electrical efficiency.
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Lee Benny T.
Pacific Scientific Company
Philogene Haissa
LandOfFree
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