Ballast having a reactive feedback circuit
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United States of America Patent
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-
Aug 8, 2000
Issued Date -
N/A
app pub date -
Dec 18, 1998
filing date -
Jun 23, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit for energizing a load includes an inverter which provides a feedback signal to a rectifier for substantially linear operation of the rectifying diodes. In one embodiment, a ballast includes a rectifier and a resonant inverter which energizes a lamp. The inverter generates a current that is split between a first path which includes the lamp and a second path which includes a feedback capacitor. A feedback path, which includes a feedback inductor, extends from the feedback capacitor to a point between the rectifying diodes. The feedback capacitor and feedback inductor resonate in series to provide a reactive feedback signal for achieving substantially linear operation of the diodes. In another embodiment, the lamp current flows to a clamp circuit for limiting the lamp current to a predetermined level.
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