Apparatus for dimming a fluorescent lamp with a magnetic ballast
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United States of America Patent
Stats
-
Mar 25, 2003
Grant Date -
Feb 14, 2002
app pub date -
Apr 12, 2001
filing date -
Oct 15, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A current controlled dimmer for controlling the output intensity of a fluorescent lamp with a magnetic ballast. The current controlled dimmer generates an AC current which follows the shape of the AC line voltage for the fluorescent lamp. The light intensity output of the fluorescent lamp is controlled by varying the amplitude of the AC current. The AC current is generated using a pulse width modulator (PWM) to modulate the AC line voltage. The current controlled dimmer 10 utilizes a feedback control loop which applies proportional and integral (PI) control to the PWM modulation. In another embodiment of the current controlled dimmer, the AC current is generated by rectifying the AC line voltage and modulating the rectified voltage by a pulse width modulator (PWM) into positive and negative cycles to generate a 60 Hz AC current signal.
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