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8183794 Apparatus and methods for the thermal regulation of light emitting diodes in signage  
Apparatus and methods for the thermal management of one or more light emitting diode (LED) modules disposed within a channel sign are disclosed. The apparatus, in various aspects, detects the...
8179055 LED circuits and assemblies  
An AC-driven LED circuit 10 includes a first parallel circuit 12 having a first branch 14 and a second branch 16 which connect at first and second common point 18, 20. The common points 18, 20...
8164279 Method for controlling light source driving circuit  
A method for controlling a light source driving circuit is provided. The method includes driving a plurality of serially-connected light sources, and measuring a working parameter of the light...
8148905 AC light emitting diode and AC LED drive methods and apparatus  
An AC LED package and circuits are disclosed along with an AC LED driver. The AC LED circuit may include as few as one LED or an array of anti-parallel LEDs driven with AC power sources and AC LED...
8134299 LED control system using modulated signal  
An LED control system using a modulated signal includes a computer, a data storage unit, an AC power, a power conversion circuit, a control circuit, and an LED lamp string. The AC power is...
8120274 Controlling circuit for a light emitting device  
A controlling circuit and a controlling method are disclosed. The controlling circuit includes a plurality of switches and a comparator. The first terminals of the switches are respectively coupled...
8110997 LED drive circuit  
A LED drive circuit equipped with oscillator 18, up/down counter 20, and DAC 22 in order to drive multiple LEDs 10(1)-10(m) in a block. Up/down counter 20 carries out count-up/down operations in...
8093819 Flashing light string  
A light string includes a load comprising a trigger LED assembly and a lighting assembly connected in series with the trigger LED assembly, the lighting assembly comprising a plurality of series...
8089218 Lighting devices  
Lighting devices capable of being powered by both AC and DC power sources without requiring AC power source to the DC power source conversion are provided, in which a lighting module comprises a...
8077139 Driving circuit of backlight module  
A driving circuit of a backlight module is provided. The driving circuit has a dimming unit used for transmitting signals, wherein the dimming unit can adjust a current flowing through a...
8072153 Multi-color backlight control circuit and multi-color backlight control method  
The present invention discloses a multi-color backlight control circuit, comprising: a plurality of pins for electrically connecting with a plurality of LED strings of different LED colors; and a...
8044599 Light string with alternate LED lamps and incandescent lamps  
In one embodiment an electrical circuit for use as a string of lights includes a load comprising a plurality of lamps connected in series, the lamps comprising a first group of lamps including an...
8040071 Circuits and methods for driving light sources  
In one embodiment, a driving circuit includes an AC/DC converter which converts an AC voltage to a DC voltage and a DC/DC linear regulator which regulates a current through, e.g., an LED light...
8035307 AC to DC LED illumination devices, systems and methods  
Illumination devices (10), systems and methods that convert an alternating current (AC) supply (14) to a direct current (DC) for powering a plurality of light emitting diodes (LEDs) are disclosed....
8035310 Circuit for driving light source  
A light source driving circuit including a driving module, a plurality of first switches, a detecting unit, and a control unit is provided. The plurality of first switches is respectively coupled...
8035306 Device for setting luminosity of light-emitting diodes  
The invention concerns a circuit for setting all types of LED'S (7), mounted in series of five, their particular arrangements in series of five, powered by a direct voltage higher than 14 volts,...
8022634 Method and system for dimming AC-powered light emitting diode (LED) lighting systems using conventional incandescent dimmers  
A dimming control circuit for dimming light emitting diodes receives an AC input voltage signal from a dimming circuit. The control circuit includes a power stage and a current control loop coupled...
8018170 Light emitting diode driving module  
An LED driving module suitable to drive a plurality of LED strings in parallel connection is disclosed. The LED driving module includes a voltage converting apparatus, a conduction voltage...
7948190 Apparatus and methods for the thermal regulation of light emitting diodes in signage  
Apparatus and methods for the thermal management of one or more light emitting diode (LED) modules disposed within a channel sign are disclosed. The apparatus, in various aspects, detects the...
7919936 Driving circuit for powering light sources  
There is provided a driving circuit for powering a plurality of light sources. The driving circuit includes a power converter, a plurality of switching regulators and a plurality of switching...
7902771 Time division modulation with average current regulation for independent control of arrays of light emitting diodes  
Exemplary apparatus, method and system embodiments provide for separately and independently sourcing current to a series of light emitting diodes of a plurality of series of light-emitting diodes....
7893626 Multi-color backlight control circuit and multi-color backlight control method  
The present invention discloses a multi-color backlight control circuit, comprising: a plurality of pins for electrically connecting with a plurality of LED strings of different LED colors; and a...
7852010 Lighting device and method of lighting  
A lighting device, comprising at least first and second current regulators, each switchable among two settings, and at least first and second groups of solid state light emitters. If the first...
7847487 LED lighting device  
Two LED arrays are connected in parallel, and the both ends of the parallel connection are connected to an alternating-current power supply AC. In each of the LED arrays, a capacitor and three LED...
7675240 Light emitting diode circuit having even current  
A light emitting diode (LED) circuit having even current has multiple LED strings, a current equalizing integrated circuit (IC) and a voltage compensation module. The LED strings are connected to...
7649326 Highly efficient series string LED driver with individual LED control  
A current source generates, with high efficiency, a current that is substantially constant over a wide range of output voltages. This current is injected into the first end of a series-connected...
7609008 Method and circuit for controlling an LED  
A control circuit coupled to a power line controlled by a dimmer having a switching device includes, for example, an active power factor correction circuit receiving power from a bridge rectifier...
7564198 Device and method for driving LED  
An LED lighting device of AC power-driven type having a comparatively simple constitution and a high power efficiency. The device compares a signal voltage (rectified voltage) obtained by...
7551101 Light emitting device drive controller, and a light emitting device driving apparatus  
A light emitting device drive controller is disclosed that comprises a first port that is connected to one end of a first light emitting device group where two light emitting devices are connected...
7501772 LED lighting string employing rectified and filtered device  
An improved LED lighting string employs a rectified and filtered device functioned as a low pass filter device to rectify input AC source into DC source providing to the LED lighting string for...
7489086 AC light emitting diode and AC LED drive methods and apparatus  
An AC LED package and circuits are disclosed along with an AC LED driver. The AC LED circuit may include as few as one LED or an array of anti-parallel LEDs driven with AC power sources and AC LED...
7482760 Method and apparatus for scaling the average current supply to light-emitting elements  
The present invention provides a method and apparatus for scaling the average drive current supplied to a light-emitting element or string thereof by coupling a scaling signal to an original...
7423387 Apparatus and method for controlling colour and colour temperature of light generated by a digitally controlled luminaire  
The present invention provides a method and apparatus for controlling the correlated colour temperature (CCT) or colour of light produced by an array of light-emitting elements by providing...
7420335 Switched constant current driving and control circuit  
The driving and control device provides a desired switched current to a load including two or more strings of one or more electronic devices. The device includes one or more voltage converters...
7408304 Apparatus for power circuit of light emitting diode  
The invention is set for connecting L.E.D., bridging rectifier and AC/DC power transformer by using series connection method, also the main purpose is for saving energy and reducing the cost of...
7408305 Codable electronic circuit arrangement and method for producing it  
A codable electronic circuit arrangement, in particular an LED circuit arrangement (1), having a lead (3), via which electronic circuit elements (6) of the circuit arrangement, in particular LED...
7327586 Power supply unit and lighting device for vehicle  
A power supply unit comprises: a voltage output section for supplying a voltage to a plurality of loads connected in parallel with each other; and a plurality of output side coils provided...
7235930 Decorative tree with coordinated visual and sound effects  
A decorative tree uses a control circuit to operate multiple light strings and a speaker. Based on different types of music output by the speaker, the control circuit determines the light strings...
7138770 LED driving circuit  
An LED driving circuit that is directly activated by an AC power supply is disclosed. A driving circuit has a first and second pair of opposite branches. The first pair of opposite branches...
7042165 Driver circuit for LED vehicle lamp  
A first vehicle lamp driver circuit for a light emitting diode (LED) array, the LED array having a first string of four LEDs in series and a second string of four LEDs in series. A first LED driver...
7029145 Low voltage decorative light string including power supply  
One or more strings of decorative lights are supplied with power by converting a standard residential electrical voltage to a low-voltage, and supplying the low-voltage to at least one pair of...
6930452 Circuit arrangement  
In a circuit arrangement for driving a LED array comprising red, green and blue LEDs, a control loop is added for limiting the duty cycles of the control signals for driving the red, green and blue...
6777889 Light animation device  
The present invention concerns a light animation device comprising an animator and a light string A first bridge and a second bridge are connected in parallel between the common feed wire and the...
6580228 Flexible substrate mounted solid-state light sources for use in line current lamp sockets  
A lamp using solid-state light emitting sources is configured to be used in a conventional socket. The lamp includes a flexible substrate on which are mounted a plurality of light emitting sources,...
6559605 Synchronous multiple serial-lamps sets  
A synchronous multiple serial-lamps sets includes a plurality of serial or serial and parallel lamp sets; an IC set, an IC set auxiliary part, a power supply connector; and a signal transmission...
6392359 System and method for reducing wavelength variations between light emitting diodes  
A system and method for reducing wavelength variations between light emitting diodes (LEDs) is provided that determines an emission wavelength of each of a plurality of LEDs at a common drive...
6344716 Christmas light string  
An electrical circuit for use with plural, low voltage loads such as a string of Christmas lights is disclosed comprising groups of lights placed electrically in a series circuit but the lights...
6288497 Matrix structure based LED array for illumination  
A matrix structure-based light-emitting diode array includes a plurality of input resistances connected in parallel to one terminal of a current source, and a plurality of output resistances...
6268702 Lamp for an external warning light  
A LED lamp has a tubular metal body 1 having bayonet fitting lugs 2 and a central insulated contact 3 at its base. The top 4 of the body is angled and has a small metal plate 5 set in potting...
6072280 Led light string employing series-parallel block coupling  
An LED light string employs a plurality of LEDs wired in a series-parallel block. Further, each series-parallel block may be coupled in parallel, the parallel connection coupled across a supply...
Matches 1 - 50 out of 67 1 2 >