Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2009-01-06
2011-12-13
Choi, Jacob Y. (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S307000, C315S308000
Reexamination Certificate
active
08076866
ABSTRACT:
Aspects of the invention include an electronic ballast and method for controlling current through a lamp to produce various current waveforms through the lamp. In one embodiment, the ballast samples and adjusts the current through the lamp on a micro-second time scale within each half-cycle of the current waveform (i.e., at least twice within a period of a reference waveform). The ballast can accommodate different lamp types, provide arbitrary current waveforms, operate a lamp at multiple power levels, and provide power to the lamp as a function of an operational state of a lamp. For example, in one embodiment, the ballast increases power to the lamp and adjusts the current waveform provided to the lamp as the lamp ages to minimize luminous flux loss caused by darkening of lamp walls and changes in lamp chemistry.
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Lenef Alan L.
Whitt Phillip R.
Choi Jacob Y.
Clark Robert F.
Marten Andrew
OSRAM Sylania Inc.
Vu Jimmy
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