Patent
Solid-state lighting apparatus and methods using parallel-connected segment bypass circuits
Ihor Lys
- 29 Dec 2011
38
TL;DR: In this article, a lighting apparatus includes a plurality of light emitting diode (LED) sets coupled in series and a bypass circuit coupled in parallel with one of the LED sets and configured to sense and control a bypass current.
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Abstract: A lighting apparatus includes a plurality of light emitting diode (LED) sets coupled in series. The apparatus further includes a bypass circuit coupled in parallel with one of the LED sets and configured to sense and control a bypass current when the one of the LED sets is in a first bias state and to attenuate the bypass current responsive to a transition of the one of the LED sets to a second bias state. The first bias state may be substantially non-conducting and the second bias state may be conducting. The apparatus may include a plurality of such bypass circuits, respective ones of which are coupled in parallel with respective ones of the LED sets such that the bypass circuits are coupled in series.
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Citations
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Anatoly Shteynberg,Dongsheng Zhou,Harry Rodriguez,Mark Eason,Bradley M. Lehman,Stephen F. Dreyer,Thomas J. Riordan +6 more
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TL;DR: In this article, an apparatus, method, and system for providing AC line power to lighting devices such as light emitting diodes (LEDs) is described, which consists of a plurality of LEDs coupled in series to form an array of segments of LEDs.
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Patent
AC driven solid state lighting apparatus with LED string including switched segments
Antony Paul Van de Ven,Terry Given +1 more
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TL;DR: In this article, a diode selection circuit for a light emitting apparatus according to some embodiments includes a plurality of light emitting devices coupled in series, including a comparator configured to receive a rectified AC input signal and a reference voltage and to generate a control signal in response to comparison of the input signal with the reference voltage.
175
Patent
LED string driver with light intensity responsive to input voltage
Noam Tziony,Alon Ferentz,Roni Blaut,David Pincu,Chanoch Kahn +4 more
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TL;DR: In this article, a driving arrangement for a plurality of light emitting diodes (LEDs), the driving arrangement constituted of: the plurality of serially connected first LEDs coupled to a source voltage; a pluralityof first electronically controlled switches, each associated with a particular one of the first LEDs and arranged to provide, when closed, a bypass current path for the associated first LED.
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Light Emitting Diode Based Lighting System With Time Division Ambient Light Feedback Response
William A. Draper,John L. Melanson +1 more
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TL;DR: In this article, the authors present a lighting system that includes time division light output sensing and adjustment for ambient light, where each lamp is contained in multiple lamps, and a controller modulates power to the LED set by selectively reducing power using time division algorithm to allow a light sensor to sense the brightness of ambient light with a reduced contribution from the LED sets.
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