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7619447 |
High voltage high side transistor driver
A high side transistor driver includes a sender module that generates a power input signal. A converter module receives the power input signal and generates an output signal that has a higher...
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7619371 |
Inverter for driving backlight devices in a large LCD panel
Two out-of-phase inverters are used for driving a backlight for large LCD panels. The lamp currents of each inverter are regulated to substantially the same level to ensure the same brightness in...
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7619369 |
Method and circuit arrangement for operating a discharge lamp
A method and a circuit arrangement for operating a discharge lamp, in particular during the first hours of operation after lamp manufacture, are described. The method and the circuit arrangement...
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7619362 |
Outer jacket leak detection method and ballast implementing the method
A method of detecting a leak in an outer jacket of a metal halide lamp having an arc tube inside the outer jacket and operated by a ballast, where the ballast monitors an electrical characteristic...
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7615940 |
Gate driver topology for maximum load efficiency
A circuit comprises a first input for receiving a supply voltage and a second input for receiving a sensed current signal from an output of a DC to DC converter. The circuit also includes an output...
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7615939 |
Spectrally calibratable multi-element RGB LED light source
An LED lighting system is disclosed. The lighting system includes means to calibrate the light temperature and intensity between multiple modules in one system, or to calibrate the light...
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7615937 |
High-pressure discharge lamp lighting device and lighting fixture
An object of the invention is to provide a high-pressure discharge lamp lighting device capable of executing dimming up to a lower luminous flux level than the dimming lower limit obtained by...
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7615933 |
Pulsed dielectric barrier discharge
A method of generating a fast-rise time voltage step to produce an overvoltage condition for a dielectric barrier plasma discharge involves providing a pair of electrodes spaced apart by an...
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7614771 |
Wireless controlled light emitting assembly
A light emitting assembly and a system utilizing a plurality of light emitting assemblies having a plurality of light emitting elements arranged and disposed within a sub-assembly. The assembly...
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7612506 |
Method for controlling light-emission of a light-emitting diode light source
A method for controlling light-emission of a light-emitting diode (LED) light source whose heat is dissipated by a thermal module is provided. The method includes following steps: providing a...
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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...
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7605549 |
System and method for current and/or temperature control of light fixture
A system for current and/or temperature control of light fixtures includes a sensor in communication with a light fixture, sense a current flow or a temperature of the light fixture, and...
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7605548 |
Electricity controller, device for lighting discharge tube, display device and electric power control method
An electricity controller is provided which comprises a first power control means for controlling output power from power generator 4 to a first level during a first period of start-up time for...
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7605546 |
Discharge lamp lighting apparatus and semiconductor integrated circuit
A discharge lamp lighting apparatus includes a triangular signal oscillator, a first control part to compare the triangular signal with an error voltage between a reference voltage and a voltage...
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7605545 |
Control system for multiple fluorescent lamps
The present invention is directed to an apparatus that drives a lighting system with multiple lamps. A phase shift mechanism is produced either by a digital method, an analog method, or a mixture...
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7598684 |
Methods and apparatus for controlling devices in a networked lighting system
Methods and apparatus for computer-based control of light sources in a networked lighting system. In one example, a plurality of LED-based lighting systems are arranged as computer controllable...
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7598683 |
Control of light intensity using pulses of a fixed duration and frequency
A method and circuit to control the intensity of lights, illumination fixtures, and displays using pulses of a fixed duration and a fixed frequency (FD/FF) is provided. In particular, the method...
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7598682 |
Current regulator apparatus and methods
An apparatus according to the present invention provides regulated pulsed current to an LED from a voltage source such as a rectified AC voltage. The present inventions provide methods for...
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7598680 |
Electronic power protection circuit and applications thereof
An electric power protection circuit connected in series to a secondary side circuit of a transformer in a switch mode power supply includes a voltage/current limiting device to get an electric...
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7598679 |
Integrated circuit capable of synchronization signal detection
A method according to one embodiment may include providing power to at least one light source. The method of this embodiment may also include detecting the frequency of at least one vertical...
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7598677 |
Multiple failure detection shutdown protection circuit for an electronic ballast
A shut-down circuit configured for use with an electronic ballast coupled to a lamp in a control path includes a device for sensing the electrical energy associated with the control path, and a...
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7595596 |
Power-saving control circuit and method for OLED panel
The present invention discloses a power-saving control circuit for an OLED panel, comprising: a plurality of OLEDs respectively located in a corresponding plurality of paths; a current amount...
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7595595 |
System and method for current and/or temperature control of light fixtures
A system ( 100 ) for current and/or temperature control of light fixtures includes a sensor ( 110 ) structured to be in communication with a light fixture ( 150 ), sense a current flow or a...
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7595490 |
Charged particle beam emitting device and method for operating a charged particle beam emitting device
A method for operating a charged particle beam emitting device and, in particular, an electron beam emitting device including a cold field emitter is provided. The method includes the steps of...
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7592756 |
Driving circuit for light emitting diodes
A driving circuit includes a DC-to-DC voltage converter, a current source, a detector and a feedback control circuit. The DC-to-DC voltage converter has a switch and generates a driving voltage on...
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7592755 |
Light source driving circuit
A light source driving circuit for driving a light-emitting element is provided. The light source driving circuit includes a power supply circuit, a dimming circuit, and a feedback circuit/control...
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7589480 |
High intensity discharge lamp ballast
A low current loss ballast operates a high intensity discharge lamp with or without radioactive krypton. A by-pass capacitor in conjunction with a resonant strike circuit limits high frequency...
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7589476 |
Power supply for external electrode fluorescent lamps
The present invention provides a power supply circuit for providing power for a plurality of external electrode fluorescent lamps (EEFLs) connected in parallel, comprising a controllable voltage...
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7589472 |
Electronic ballast with lamp type determination
The electronic ballast with lamp type determination for an electronic ballast providing power to a lamp filament 208 includes a filament current sensing circuit 220 operably connected to the...
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7586408 |
Self-powered long-life occupancy sensors and sensor circuits
Occupancy sensors are provided that do not require an external power source in order to operate. The sensors operate with a low voltage non-rechargeable battery and are fully functional for at...
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7586274 |
LED light output linearization
A system and method for producing a flattened characteristic for LED luminous output. The system may include an array containing one or more light emitted diodes, a power source connected to the...
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7586268 |
Apparatus and method for controlling the filament voltage in an electronic dimming ballast
An electronic dimming ballast comprises a filament turn-off circuit for controlling the magnitudes of filament voltages supplied to the filaments of a gas discharge lamp. Each of a plurality of...
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7586266 |
Driver circuit for an HID lamp and method for operating an HID lamp
The present invention relates to a driver circuit for an HID lamp having a circuit arrangement for applying a radiofrequency signal for the purpose of starting the lamp and for applying a...
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7586265 |
Illumination device
An illumination device is described that includes a light source that is an organic light-emitting diode and a control device capable of adjusting the current through the organic light-emitting...
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7583035 |
System and method for driving LED
A system drives one or plurality of LEDs regulating their brightness by controlling LEDs average current or voltage. The system includes a switching power converter and an integrated digital...
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7581837 |
HDR displays and control systems therefor
A display has a screen which incorporates a light modulator. The screen may be a front projection screen or a rear-projection screen. Elements of the light modulator may be controlled to adjust the...
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7579789 |
Device for driving light sources
A driving device for driving a lamp (L) includes a power stage circuit ( 21 ), a transformer circuit ( 22 ), a voltage dividing circuit ( 23 ), an inrush current sensing circuit ( 24 ), and a...
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7579786 |
Method, apparatus, and system for driving LED's
A method and apparatus for driving LED's is disclosed, comprising the steps of receiving a desired intensity value, wherein the desired intensity value represents the desired intensity for the...
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7576498 |
Organic EL drive circuit and organic EL display device using the same
A voltage corresponding to the maximum voltage value among respective terminal voltages at least at the time of light emission of organic EL elements is held in a hold circuit, and a power source...
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7573211 |
Backlight control circuit
The present invention discloses a backlight control circuit, comprising: a voltage supply circuit, which is a boost converter circuit for receiving an input voltage from an input terminal and...
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7573210 |
Method and system for feedback and control of a luminaire
A method and system for controlling the chromaticity and luminous flux output of a digitally controlled luminaire. The luminaire includes one or more light-emitting elements and one or more light...
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7573208 |
Method of programming a lighting preset from a radio-frequency remote control
The present invention provides a method of programming a preset intensity of a dimmer switch from a radio-frequency (RF) remote control. A user is able to adjust the intensity of the lighting load...
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7567067 |
Power supply, display device, and light source driving apparatus
A power supply is provided, which includes a DC-DC converter being supplied with an external DC input voltage and a first switching control signal and outputting a duty sensing signal of which a...
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7564201 |
Intelligent gas discharge lamp control circuit
An electronic control circuit for intelligently controlling a gas discharge lamp associated with an HVAC system. The circuit includes a microcontroller having a memory containing instructions...
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7564200 |
Discharge lamp lighting circuit with frequency control in accordance with phase difference
A discharge lamp lighting circuit is provided. The discharge lamp lighting circuit includes a power supplying portion which comprises an inverter circuit comprising a switching element; a series...
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7564199 |
Discharge lamp lighting circuit
A discharge lamp lighting circuit includes a power supplying portion having a series resonant circuit including transistors and a bridge driver, a starting portion for applying a high voltage pulse...
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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...
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7564197 |
Discharge tube operation device
A time division signal (S 2 ) for instructing a lit period and an unlit period of a discharge tube ( 23 ) is input to an error amplifier ( 41 ) of an integration circuit ( 40 ). The integration...
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7564196 |
Power supply device, and LED device and electronic device using same
A power supply device includes a step-up circuit configured to supply a driving voltage to a load, a comparison circuit configured to compare an output voltage from the load with a reference...
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7564195 |
Circuit of the electronic ballast with the capability of automatic restart
This present invention discloses a circuit of the electronic ballast with the capability of automatic restart. It includes a rectifier circuit, a trigger circuit of automatic restart, a DC/AC...
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