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7626346 |
LED circuit with current control
Circuit for regulating a current applied to an electrical load, comprising
a compensation unit comprising a temperature sensor and providing an electrical signal at an output, the electrical...
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7626342 |
High efficiency power controller for solid state lighting
A high efficiency power controller comprising of a driver circuit to convert to direct current (DC) voltage from alternating current (AC) voltage is used for drive solid state lighting (SSL)...
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7626341 |
Discharge lamp lighting apparatus
A discharge lamp lighting apparatus includes an input power supply, a power supply circuit, a bridge circuit having switching elements that performs AC operation of a discharge lamp, a lighting...
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7622869 |
Discharge lamp ballast and projector
A DC-DC converter 111 with a switching element Q 11 changes a supply of power to a HID lamp DL 1 . On/off of the element Q 11 is controlled with a control circuit 13 . The circuit 13 ...
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7619904 |
Pulse signal drive circuit
A pulse signal drive circuit includes an energy storage device. A source of energy supplies a substantially constant flow of energy to the energy storage device. A switch circuit draws repetitive...
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7619372 |
Method and apparatus for driving a light emitting diode
An apparatus includes circuitry that responds to application to its input of an alternating current input signal by producing at its output an output signal suitable for driving an electronic light...
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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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7615941 |
Apparatus and method for maximizing the longevity of arc tube bulbs during pulsing operation
Heating or powering a filament less light bulb, and preferably a High Intensity Discharge light sufficiently close to steady state temperature and then pulsing the current, thereby improving and or...
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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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7615934 |
High efficiency resonant ballast
The present invention provides a low-cost ballast circuit for fluorescent lamps. A resonant circuit has a transformer to operate the fluorescent lamp. The fluorescent lamp is connected in series...
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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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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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7609007 |
Dimmer adaptable to either two or three active wires
A dimmer ( 42 ) adaptable to either two (H, DH) or three (H, N, DH) active wires includes a first full-wave rectifier (D 1 , D 2 , D 3 , D 4 ) across an AC power hot (H) terminal and a dimmer hot...
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7598859 |
Method and system for controlling lighting
A method and system for controlling lighting in a space reduces energy consumption of the light sources by changing at least one of the color rendering index (CRI) and the correlated color...
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7598685 |
Off line LED driver with integrated synthesized digital optical feedback
The present invention creates an LED driver in which all feedback signals are derived from a power stage media, and presents an isolated off-line LED driver with an accurate primary side controller...
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7598678 |
Lamp lighting apparatus
A lamp lighting apparatus includes an arc spot movement detector ( 5 ) for monitoring an DC voltage Vb which is the bus voltage of an inverter ( 3 ), and for detecting a movement of an arc spot...
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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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7592753 |
Inductively-powered gas discharge lamp circuit
An inductively powered gas discharge lamp assembly having a secondary circuit with starter circuitry that provides pre-heating when power is supplied to the secondary circuit at a pre-heat...
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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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7589477 |
Control method and ballast for run-up of metal halide lamp
A method of controlling run-up of a metal halide lamp that has a nominal (full) light output during steady state operation and that has a current limit I lim , includes a lamp ballast sensing lamp...
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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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7589475 |
Electric lamp with enhanced dependability
The lamp comprises at least one light-emitting diode and an electronic power switch connected in series between a power source and the light-emitting diode. The electronic power switch is...
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7586270 |
Circuit and method for the operation of miniature high pressure short-arc lamps using alternating current
An embodiment of the invention is concerned with a circuit and a method for the generation and operation of the plasmas in High Pressure Short Arc Lamps having miniature dimensions using...
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7586269 |
Device for driving light source module
A driving device for driving a lamp (L 2 ) includes a power stage circuit ( 21 ), a transformer circuit ( 22 ), a resonance circuit ( 23 ) and a PWM controller ( 25 ). The power stage circuit...
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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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7586267 |
Inverter system and detecting device thereof
A detecting device of an inverter system comprises at least one detecting element and at least one comparative unit. The detecting element is electrically connected to any one of the connecting...
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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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7579790 |
Multiple gas discharge lamp interleave trigger circuit
Embodiments are disclosed for apparatus and methods for increasing the reliability of the flash discharge response in pulsed gas discharge lamps. One embodiment includes a system comprising two gas...
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7579783 |
Microprocessor-controlled insertable flashlight adapter device
An insertable flashlight adapter device for use in an ordinary flashlight having a lamp includes a disc-like shaped housing unit. Electronic circuitry is disposed within the housing unit for...
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7579782 |
Circuitry for portable lighting devices and portable rechargeable electronic devices
A portable rechargeable electronic device, such as a flashlight, with external charging contacts and a short protection circuit is disclosed. The short protection circuit electrically uncouples one...
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7573729 |
Resonant power LED control circuit with brightness and color control
The invention relates to a resonant power LED control circuit for the independent, simultaneous brightness and color or color temperature control of two LEDs ( 41, 42 ) or two groups of LEDs,...
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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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7573207 |
Driver system and method with multi-function protection for cold-cathode fluorescent lamp and external-electrode fluorescent lamp
System and method for driving a cold-cathode fluorescent lamp. The system includes a control subsystem configured to generate one or more control signals, and a power supply subsystem configured to...
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7573204 |
Standby lighting for lamp ballasts
For safety reasons, industrial lighting fixtures are required to have backup lighting systems so that if the primary lights should fail, there will still be enough light to ensure safe maneuvering....
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7569998 |
Striking and open lamp regulation for CCFL controller
An apparatus and method for igniting a lamp during a strike mode of an inverter comprising: sequentially controlling a duty cycle sweep and a frequency sweep of driving signals in the inverter to...
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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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7567039 |
Multiple discharge lamp lighting apparatus
A multiple discharge lamp lighting apparatus is provided which achieves stable and uniform lamp currents in a plurality of discharge lamps without a ballast element at the secondary side of an...
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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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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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7564194 |
Method for detecting lamp current and lamp driving circuit using the method for detecting the lamp current
A lamp driving circuit includes: a voltage supply part including a first voltage supply part and a second voltage supply part; a first circuit part including a first terminal, a second terminal and...
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7564193 |
DC-AC converter having phase-modulated, double-ended, full-bridge topology for powering high voltage load such as cold cathode fluorescent lamp
A phase-modulated, double-ended, full-bridge topology-based DC-AC converter supplies AC power to a load, such as a cold cathode fluorescent lamp used to back-light a liquid crystal display. First...
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7564192 |
HID dimming method and apparatus
A HID dimming method and apparatus are provided. The method includes generating a dc waveform during a reduced power dimming mode of operation of the HID lamp, the reduced power dimming mode being...
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7560879 |
Method and apparatus for DC to AC power conversion for driving discharge lamps
Methods and circuits are disclosed for converting DC power to AC power for driving discharge lamps such as cold cathode fluorescent lamps (CCFLs). Among other advantages, the lamp current and open...
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7560878 |
Circuit arrangement and method for operating high-pressure discharge lamps
High-pressure discharge lamps may explode at the end of their life. In order to be able to predict an explosion, the gradient of the operating voltage is evaluated. If a risk of explosion is...
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7560877 |
Operation circuit for a discharge lamp and device for operation of a discharge lamp and a light source device
An operating circuit for a discharge lamp having an external auxiliary electrode and main discharge electrodes in a discharge space, in which the disadvantage of lamp damage due to detachment of...
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