Ripple reduction method for electronic ballasts

Details Ripple reduction method for electronic ballasts Ripple reduction method for electronic ballasts

2008-01-29

2008-01-29

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S291000, C315S307000

Reexamination Certificate

active

11321799

ABSTRACT:
A rectifying circuit converts an alternating current (AC) voltage to a first direct current (DC) voltage. A filter filters the rectified first DC voltage and outputs the filtered first DC voltage which includes an alternating current (AC) voltage component or ripple voltage at filter output. A buck converter receives the filtered first DC voltage and generates a second direct current (DC) bus voltage. A power control circuit is coupled to the buck converter and provides a control voltage signal to the buck converter so that the buck converter generates the second DC voltage of a predetermined value. A ripple detection circuit is coupled to the filter output and detects the ripple voltage in the filtered first DC voltage, based on which the power control circuit modifies the control voltage signal so that the second DC voltage includes a predefined level of the ripple voltage.

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