Patent
Light emitting diode driver
Bernd Clauberg,Robert A. Erhardt +1 more
TLDR
In this paper, a high frequency inverter (20) and an impedance circuit (30) are used to produce a high-frequency voltage source whereby the impedance circuit directs a flow of alternating current through a LED array (40).Abstract:
A LED driver (10) is disclosed. The LED driver (10) includes a high frequency inverter (20) and an impedance circuit (30). The high frequency inverter (20) operates to produce a high frequency voltage source whereby the impedance circuit (30) directs a flow of alternating current through a LED array (40) including one or more anti-parallel LED pairs, one or more anti-parallel LED strings, and/or one or more anti-parallel LED matrixes. A transistor (T3) can be employed to divert the flow of the alternating current from the LED array (40), or to vary the flow of the alternating current through LED array (40).read more
Citations
More filters
Patent
LED power control methods and apparatus
TL;DR: In this article, the authors propose a power controller for a light source based on the average power delivered to the light source in a given time period, without monitoring and/or regulating the voltage or current provided to the source.
Patent
Color temperature tunable white light source
Yi-Qun Li,Yi Dong,Xiaofeng Xu +2 more
TL;DR: A color temperature tunable white light source comprises: first and second LED arrangements operable to emit light of first or second wavelength range respectively that are configured such that their combined light output, which comprises light generated by the source, appears white in color as discussed by the authors.
Patent
Load Control Device for a Light-Emitting Diode Light Source
TL;DR: In this article, an LED driver for controlling the intensity of an LED light source includes a power converter circuit for generating a DC bus voltage, an LED drive circuit for receiving the bus voltage and controlling a load current through, and thus the intensity, the driver and the controller are coupled in series with the light source.
Patent
Power control methods and apparatus
TL;DR: In this paper, the authors propose a power control system for a light source based on modulating the average power delivered to the light source in a given time period, without monitoring and/or regulating the voltage or current provided to the source.
Patent
Methods and apparatus for high power factor controlled power delivery using a single switching stage per load
TL;DR: In this article, a controllable variable power may be delivered to a load using a single switching stage while maintaining high power factor, in some cases without requiring any feedback information relating to the load conditions.
References
More filters
Patent
AC powered light emitting diode array circuits for use in traffic signal displays
TL;DR: In this paper, the use of an inductor in place of a resistor increases the efficiency of the array to approximately 80% by coupling a capacitor parallel to the array and tuning the inductor and capacitor to the frequency of the AC voltage source.
Patent
Diode drive current source
TL;DR: In this article, a current source includes a power converter coupled between the power source and the load(s) for providing pulsed current, and a controller is coupled between sensor and the power converter for regulating the amplitude of the output current supplied to the loads.
Patent
Quasi-resonant diode drive current source
Joe A Ortiz,Joseph H Ullman +1 more
TL;DR: In this article, a zero-current-switched full wave quasi-resonant buck converter is described that provides a high amplitude pulsed output current required to drive light emitting pump diodes used in a solid state diode pumped laser.
Patent
Variable-effect lighting system
TL;DR: In this article, a variable-effect lighting system includes a lamp assembly and a lamp controller coupled to the lamp assembly, which is configured to vary the color produced by the lamps by varying the conduction interval of each illuminating element according to a predetermined pattern.
Patent
Light emitting diode power supply
TL;DR: In this article, the authors propose a space efficient circuit arrangement for supplying power to an LED array, where the power supply circuit (100 ) has a rectifier ( 105 ), a starting circuit coupled to the rectifier, a gate drive (GDR) arrangement coupled with the starting circuit, and a resonant converter circuit (120, 125 ) coupled between the Rectifier (105) and a Resonant Load circuit ( 135 ).