Patent application number | Description | Published |
20080278091 | Method and Circuit for Driving Back a Light Emitter of a Display Apparatus - A back light emitter ( | 11-13-2008 |
20080303454 | Fluorescent Tube Lamp Drive Circuit - A drive circuit for driving a fluorescent tube lamp comprises a variable frequency oscillator generating a lamp drive frequency, a resonant drive circuit driving the lamp with the lamp drive frequency, and a control unit for driving the variable frequency of the latter under control of a synchronization signal. When a pre-heating frequency is generated by the variable frequency oscillator, the lamp is pre-heated while when an illumination drive frequency is generated, the lamp ignites and operates in its illuminated state. The control unit comprises a transition controller for at an ignition of the lamp limiting the drive frequency to an ultimate ignition frequency, and only enabling transition from the ultimate ignition frequency to the illumination drive frequency after an ignition delay time. | 12-11-2008 |
20090168415 | METHOD AND SYSTEM FOR ADJUSTING THE LIGHT SETTING FOR A MULTI-COLOR LIGHT SOURCE - The present inventions relates to a method for adjusting the light setting for a multi-color light source, which method comprises receiving input from a user related to at least one of white color, hue, and chroma, and adjusting white color, hue, and chroma of the light source in accordance with the user input. The method is characterized in the step of automatically changing a current hue and chroma level when the user input is received. This automatic change makes possible to render the subsequent adjustment in setting perceivable for the user, which facilitates the adjustment of the light source. The present invention also relates to a corresponding system and computer program product. | 07-02-2009 |
20090179587 | METHOD FOR DIMMING A LIGHT GENERATNG SYSTEM FOR GENERATING LIGHT WITH A VARIABLE COLOR - A method for dimming an illumination system ( | 07-16-2009 |
20100052557 | LAMP DRIVER CIRCUIT AND METHOD FOR DRIVING A DISCHARGE LAMP - A lamp driver circuit ( | 03-04-2010 |
20100117543 | LIGHTING DEVICE WITH A LED USED FOR SENSING - A lighting device ( | 05-13-2010 |
20100277079 | LIGHT SOURCE - Light source having a plurality of light elements ( | 11-04-2010 |
20120112657 | LOW COST POWER SUPPLY CIRCUIT AND METHOD - A power supply circuit has an LLC converter stage for converting a DC voltage input into a DC voltage output, and at least one hysteretic converter stage. Each hysteretic converter stage has a DC voltage input coupled to the DC voltage output of the LLC converter stage, and a DC current output. The LLC converter stage lacks a feedback control, and is operated at its load independent point. A ripple on the DC voltage output of the LLC converter does not affect the output current of the hysteretic converter stage. The stable DC current output of the hysteretic converter stage is coupled to a load having one or more LED strings. | 05-10-2012 |
20120181940 | DIMMING OF LED DRIVER - A dimmable LED driver circuit comprises a resonant DC-DC converter coupled to an output circuit. The converter comprises a half bridge or full bridge switching circuit coupled to a resonant circuit. An output of the resonant circuit is rectified and fed to the output circuit. The output circuit may comprise at least one LED series or shunt switch for switching an LED unit on and off. A control circuit controls the switches of the switching circuit at a variable switching frequency. The control circuit is also configured for controlling the switching circuit for amplitude modulating the converter and for pulse-width modulating the converter at a first pulse-width modulation frequency lower than the switching frequency. The control circuit is may further be configured for controlling the switching of the LED switch at a second pulse-width modulation frequency lower than the switching frequency. | 07-19-2012 |
20130038234 | DIMMING REGULATOR INCLUDING PROGRAMMABLE HYSTERETIC DOWN-CONVERTER FOR INCREASING DIMMING RESOLUTION OF SOLID STATE LIGHTING LOADS - A system providing deep dimming of a solid state lighting (SSL) load includes a hysteretic down-converter, a shunt switch, a controller and a comparator. The down-converter controls average current value and amplitude of ripple of SSL current using amplitude modulation (AM) dimming control. The shunt switch controls magnitude of the SSL current using pulse width modulation (PWM) dimming control. The controller generates first and second PWM signals for controlling upper and lower current levels at which the down-converter operates based on the SSL current and voltage across the SSL load, and generates a third PWM signal for controlling the shunt switch based on a dimming level load set by a dimmer. The comparator circuit compares first and second analog signals corresponding to the first and second PWM signals with the SSL current, and drives the down-converter in response to the comparison. The SSL current is based on both the AM dimming control and the PWM dimming control. | 02-14-2013 |
20130234603 | LIGHT SOURCE LUMINAIRE SYSTEM LIGHT ELEMENT CONTROL - Disclosed is a light source having a plurality of light elements and a control system for controlling the light elements. The control system includes a plurality of light element controllers, each connected to a respective light element, and arranged to obtain light element data; and a bus interface, which is connected to the light element controllers via a light source bus. The bus interface provides the light element controllers with a general command, and the light element controllers generate light element drive signals on basis of the general command and the light element data. | 09-12-2013 |
20150035452 | LED LIGHTING SYSTEM - The invention relates to LED lighting system comprising a power supply circuit and one or more LED modules. The power supply circuit is equipped with input terminals (K | 02-05-2015 |
20150061515 | LED Lighting system - The invention relates to a LED lighting system comprising a power supply circuit for supplying a LED current, equipped with input terminals (K | 03-05-2015 |