Ballast circuit with a capacitive and inductive feedback path
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United States of America Patent
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-
Feb 22, 2000
Grant Date -
N/A
app pub date -
Jun 23, 1998
filing date -
Jun 23, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit including a rectifier having rectifying diodes has a feedback signal which provides substantially linear operation of the rectifying diodes. In one embodiment, a ballast circuit includes a rectifier circuit coupled to an inverter circuit which energizes a fluorescent lamp. The inverter circuit includes a ballast capacitor coupled to an inductive feedback element. The voltages generated across the ballast capacitor and the feedback element combine to provide a feedback signal that is effective to periodically bias at least one of the rectifying diodes to a conductive state during substantially the entire AC input signal. The substantially linear operation of the rectifying diodes enhances THD and PF performance of the circuit.
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