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United States of America Patent
Stats
-
Mar 18, 2003
Grant Date -
Jul 18, 2002
app pub date -
Oct 23, 2001
filing date -
Oct 25, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ballast circuit comprises an inverter formed by a bridge circuit. The power consumed by a lamp connected to the ballast circuit is controlled by controlling the duty cycles of control signals that drive the bridge switches. The duty cycle is proportional to digital signals generated by a pulse duration modulator included in a microprocessor. To increase the number of settings to which the lamp power can be set, the digital signals are modulated.
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