Crest factor reduction method for electronically ballasted...

Details Crest factor reduction method for electronically ballasted... Crest factor reduction method for electronically ballasted...

2008-04-29

2008-04-29

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

Reexamination Certificate

active

07365499

ABSTRACT:
A buck converter generates a direct current (DC) bus voltage at a buck converter output. An inverter circuit is coupled to the buck converter and configured to receive the generated DC voltage and convert the DC voltage into an alternating current (AC) voltage to drive a lamp. A power control circuit is coupled to the buck converter output and configured to provide a control voltage signal to the buck converter so that the buck converter generates the DC voltage and current of a predetermined value. A crest factor reduction circuit is coupled (a) to the buck converter output to sense a rate of change in the generated DC bus voltage, and (b) to the power control circuit to modify the control voltage signal based on the sensed rate of change in the DC bus voltage.

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