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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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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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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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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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7609005 |
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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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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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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7595786 |
Illumination system and illumination control method for adaptively adjusting color temperature
This invention discloses an illumination method and an illumination control method. An embodiment of the illumination system includes two light detection modules for detecting a light produced by a...
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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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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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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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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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7586273 |
Method and apparatus for achieving perceived light mixing via alternating different colored LEDS
A method and apparatus for achieving perceived light mixing via alternating colored light emitting diodes (LEDs) is disclosed. For example, a control signal to produce a requested color output is...
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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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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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7569997 |
Self-calibrated integration method of light intensity control in LED backlighting
This invention is an LED lighting intensity control by subdivision of PWM intervals to resolve the wavelength and luminance shifting problems that are caused by increasing heat and junction...
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7567041 |
Discharge lamp lighting apparatus and projector
In a lamp lighting apparatus for lighting a high intensity discharge lamp, which is used for a projector, it is possible to carry out high speed modulation of brightness of the discharge lamp, in...
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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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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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7560880 |
Control device for work lamp
A control device for work lamp includes a microprocessor, which is able to receive signals sent from a power supply unit and a switch. The microprocessor is able to determine the number of times...
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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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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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7560868 |
Ballast with filament heating and ignition control
A ballast ( 10 ) for powering at least one gas discharge lamp ( 70 ) having heatable filaments ( 72,74 ) includes an inverter ( 200 ), a resonant output circuit ( 400 ) coupled between inverter (...
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7557523 |
Discharge lamp lighting device, and lighting equipment and lighting system using the device
A level shift IC ( 3 b ) of a power supply/shutoff section ( 3 ) is operable, when a shutoff signal (Sa) is input from a timer circuit ( 8 ) for a time T during an ON state of a discharge lamp ( 7...
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7554319 |
Circuits and methods for voltage sensing
A voltage sensing circuit includes a voltage divider and a voltage rectifier. The voltage divider divides a first output voltage on a first output voltage line to a first divided output voltage....
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7550934 |
LED driver with fast open circuit protection, short circuit compensation, and rapid brightness control response
An LED driver drives one or more strings of series-connected LEDs. A feedback voltage at a sense resistor is detected by an op amp, and the op amp controls the conductivity of a MOSFET in series...
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7550933 |
Offline control circuit of LED driver to control the maximum voltage and the maximum current of LEDs
An offline control circuit of LED driver controls the maximum voltage and the maximum current of a plurality of LEDs. A switching circuit generates a plurality of LED currents through a...
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7550931 |
Controlled lighting methods and apparatus
Described herein are lighting units of a variety of types and configurations, including linear lighting units suitable for lighting large spaces, such as building exteriors and interiors. Also...
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7548031 |
Lighting apparatus for discharge lamp
In the transient electric power control of a discharge lamp containing no mercury or a small amount of mercury, a change value relating to a lamp voltage from the initial value thereof is detected....
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7538498 |
Driving circuit of surface light source and method of driving the same
A driving circuit of a surface light source and a method of driving the same are disclosed, which is suitable for decreasing the luminance-stabilization period of time and improving the...
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7535181 |
Method and device for ballast management in particular for a motor vehicle headlamp
A method for managing a gas discharge lamp in particular for a motor vehicle headlamp. The method is of the type which consists in controlling initial and nominal supply powers of the lamp by means...
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7531970 |
Power source driving circuits and controllers thereof
A controller for a driving circuit of power source comprises a frequency generator, a pulse width modulator, and a driving device. The frequency generator comprises a latch circuit. The frequency...
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7528558 |
Ballast with ignition voltage control
A ballast ( 10 ) for powering a lamp load ( 70 ) comprising one or more gas discharge lamps ( 72,74 ) includes an inverter ( 200 ), a resonant output circuit ( 400 ), and a control circuit ( 600 )....
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7528556 |
Light regulation device
A light regulation device includes at least one light sensor which provides at its output a real brightness value, at least one regulator to which a set brightness value can be supplied, besides...
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7528555 |
LED controller IC using only one pin to dim and set a maximum LED current
An LED driver IC is described that uses a single pin to both set the maximum current through one or more driven LEDs and variably control the brightness of the LEDs. A single resistor is connected...
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7525820 |
Inverter
Primary and secondary regions are electrically insulated from each other. The first and second pulse transformers are provided to the respective transistors in the switching circuit. Secondary...
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7525256 |
HID buck and full-bridge ballast control IC
An integrated circuit controls a power converter that includes single stage buck-boost converter and a switching full bridge that may be used to drive an HID lamp. The single stage buck-boost...
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7521878 |
Applications of halogen converter control IC
The functionality of electronic convertors for low voltage filament lamp applications, such as halogen lamps, can be increased by including auxiliary circuits. Such auxiliary circuits may include...
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7511433 |
Discharge lamp lighting device and projector
A high pressure discharge lamp lighting device includes: a DC power supply circuit that is supplied with a DC voltage and performs current control to supply a predetermined constant power to a high...
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7508143 |
Driving apparatus and method for driving light emitting elements, and projector
A light-emitting element driving apparatus, method and projector are provided, in which a common power supplying section drives plural light emitting elements of different rated current in a time...
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7508142 |
Ballast control circuit for use with CCFL and EEFL lamps
A ballast control circuit for driving at least one gas discharge lamp in accordance with an embodiment of the present application includes a high side driver operable to provide a high side driving...
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7504782 |
Discharge lamp lighting apparatus and projector
A discharge lamp lighting apparatus comprising a d.c. power source section which rectifies and smoothes an a.c. voltage; a current detecting circuit which detects a current which flows through a...
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7504781 |
Method for driving a LED based lighting device
A lighting device, and a lighting system including such a lighting device and an adjustable power source, includes at least one LED, a control device employing a device for measuring a quantity...
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7504780 |
Power supply unit for light source and method of controlling the same
A power supply unit capable of varying power supplied to a light source at timings determined by synchronization signals is provided. The power supply unit comprises an interface that receives a...
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7498753 |
Color-compensating Fluorescent-LED hybrid lighting
A hybrid fluorescent-LED lighting system comprising a controller, LED elements, fluorescent lamp, and a color/brightness sensor, wherein the color/brightness sensor measures a combined light output...
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7495398 |
Discharge lamp lighting apparatus
A discharge lamp lighting apparatus includes: an inverter circuit including a switch circuit and a high-voltage transformer; a step-up circuit connected at the input stage of the inverter circuit;...
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7492108 |
System and method for driving light-emitting diodes (LEDs)
System and method for improving efficiency in driving LEDs. A preferred embodiment comprises a switch current regulator coupled to a current control signal input, the switch current regulator to...
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7489090 |
Electronic ballast having adaptive frequency shifting
An electronic ballast for driving a gas discharge lamp avoids mercury pumping in the lamp by adaptively changing an operating frequency of an inverter of the ballast when operating near high-end....
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