Patent
Solid-state lighting apparatus and methods using switched energy storage
Liqin Ni
- 21 May 2012
25
TL;DR: In this paper, a switching circuit is configured to route current through the least one LED to the at least one charge storage device for a first state of an applied voltage and to discharge the battery via the LED for a second state of the applied voltage.
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Abstract: An apparatus includes at least one LED, at least one charge storage device and a switching circuit configured to route current through the least one LED to the at least one charge storage device for a first state of an applied voltage and to discharge the at least one charge storage device via the at least one LED for a second state of the applied voltage. The apparatus may further include a current control circuit coupled in series with the at least one LED.
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Citations
Patent
Driving Circuits for Solid-State Lighting Apparatus With High Voltage LED Components and Related Methods
Praneet Athalye,Qingcong Hu,Michael Walters,Eric Menzel,Michael James Harris +4 more
- 29 Oct 2012
TL;DR: In this paper, a driving circuit for a solid state lighting apparatus includes a full wave rectifier configured to rectify an alternating current (AC) input voltage signal to generate a rectified input signal, a boost conversion circuit configured to receive the rectified output signal and responsively generate a direct current (DC) output voltage signal and to supply the output voltage signals to a solid-state light source, and a boost control circuit coupled to the boost conversion circuits and configured to cause the Boost conversion circuit to operate in a constant power mode.
55
Patent
Light Sources Adapted to Spectral Sensitivity of Diurnal Avians and Humans
Zdenko Grajcar
- 17 Mar 2011
TL;DR: In this article, a light source that provides light at wavelengths that substantially correlate to local maxima in the spectral sensitivity of a diurnal avian was used to illuminate the visual response characteristic of the avians.
43
Patent
Half bridge driver circuits
Daniel M. Kinzer,Santosh Sharma,Ju Jason Zhang +2 more
- 07 Oct 2015
TL;DR: In this paper, a GaN-based half bridge power conversion circuit employs control, support and logic functions that are monolithically integrated on the same devices as the power transistors.
33
Patent
GaN circuit drivers for GaN circuit loads
Daniel M. Kinzer,Santosh Sharma,Ju Jason Zhang +2 more
- 11 Jun 2015
TL;DR: In this paper, an electronic circuit including a substrate having GaN, and a power switch formed on the substrate and including a first control gate and a first source was disclosed, where the output can be driven to the supply voltage.
27
Patent
Half bridge power conversion circuits using GaN devices
Daniel M. Kinzer,Santosh Sharma,Ju Jason Zhang +2 more
- 24 Mar 2015
TL;DR: In this article, GaN-based half bridge power conversion circuits employ control, support and logic functions that are monolithically integrated on the same devices as the power transistors.
16
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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
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Kenji Yamamoto,Richard Lum Kok Keong +1 more
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TL;DR: In this paper, the authors compare a signal voltage (rectified voltage) obtained by rectifying an AC source with a predetermined reference voltage and controls ON/OFF of a driving current to each LED of an LED array in response to a comparison result.
191
Patent
Methods and apparatus for controlling series-connected leds
Ihor A. Lys
- 09 Nov 2007
TL;DR: In this paper, a controller monitors at least one parameter representative of the operating voltage, determines a maximum number of the series-connected LEDs that can be energized by the voltage, and controls the controllable current path(s) so as to increase an amount of series current that is diverted around at least the first LED when the maximum number is less than a total number of all of all the LEDs connected in series.
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Highly efficient series string LED driver with individual LED control
Brant Ture Johnson,James Henry Aliberti +1 more
- 27 Mar 2007
TL;DR: In this article, a field effect transistor (FET) is placed in parallel with each LED in the string, and a level shift gate driver couples a pulse width modulated control signal to the gate of each FET.
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