Magnetic feedback ballast circuit for fluorescent lamp
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United States of America Patent
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Aug 25, 1998
Grant Date -
N/A
app pub date -
Dec 18, 1996
filing date -
Dec 18, 1996
priority date (Note) -
Expired
status (Latency Note)
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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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