Electric lamp and discharge devices: systems – Plural load device systems
Reexamination Certificate
2008-05-20
2008-05-20
Owens, Douglas W. (Department: 2821)
Electric lamp and discharge devices: systems
Plural load device systems
C315S128000, C315S122000, C315S312000, C315S2090SC, C315S291000, C315S247000
Reexamination Certificate
active
07375476
ABSTRACT:
A lighting device (132) includes a circuit having a power supply and a plurality of light emitting diodes (120) connected in series with the power supply. The plurality of light emitting diodes (120) includes at least two groups of series-connected light emitting diodes, the groups of series-connected light emitting diodes being connected in series. A different optically isolated field effect transistor (U3-U5) is connected in parallel with each group of series-connected light emitting diodes, for selectively shunting around the group of series-connected light emitting diodes. A different capacitor (C8-C10) can also be connected in parallel with each group of series-connected light emitting diodes. A controller (U2) is connected to a gate of each of the optically isolated field effect transistors (U3-U5) for selectively turning the optically isolated field effect transistors (U3-U5) on and off. Thus, the controller U2is electrically isolated from the power supply by the optically isolated field effect transistors (U3-U5). The light emitting diodes (120) can be driven and controlled using pulse width modulation methods.
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Beer Ben A.
Corbett Robert E.
Matsui Richard G.
Walter Scott D.
Owens Douglas W.
S.C. Johnson & Son Inc.
Tran Chuc
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