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7274152 |
Rare gas fluorescent lamp lighting apparatus
There is provided a rare gas fluorescent lamp lighting apparatus including: an input power source; a transformer having a rare gas fluorescent lamp connected to the secondary side thereof; a...
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7274149 |
Lamp with integral pulse width modulated voltage control circuit
A lamp has a voltage controller that converts a line voltage to an RMS load voltage suitable for operation of the lamp's light emitting element, where the voltage controller is entirely within a...
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7274158 |
System for driving plural lamps
A system for driving a lamp module ( 13 ) includes a converter ( 11 ), a driving circuit ( 12 ), and a pulse width modulation (PWM) controller ( 14 ). The lamp module includes a plurality of lamps....
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7274157 |
Lamp operation controller and controlling method of lamp operation
In a lamp operation controller and a method thereof, for obtaining a stable light emission, simply and certainly, without necessity of detection of a parameter accompanying discharge, the lamp...
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7274155 |
Flash lamp drive circuit
The invention provides a power supply or drive circuit for a pulsed flashlamp which utilizes a two-core component having common windings as both an inductor for arc mode drive and for breakdown...
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7274159 |
Backlight for a display device
A backlight comprising a plurality of lamps, an A/D converter connected to the lamps in parallel to convert an inputted alternating current into a direct current and to provide the converted direct...
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7271546 |
Lighting device for dielectric barrier discharge lamp
This invention aims to decrease the leakage current of a dielectric barrier discharge lamp, and to prevent generation of the luminance slope between both electrodes. Electrodes 3 and 4 are...
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7271551 |
Driver protection circuit for a push-pull type discharge lamp
A driver protection circuit for a push-pull type discharge lamp comprises a discharge lamp with two input electrodes, a driver circuit having two transformer units and two driver units, and a...
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7271544 |
Lighting apparatus for illumination light source
In a lighting apparatus for an illumination light source (discharge lamp or the like), a fly-back type DC-DC converter circuit comprises a transformer and a switching element. A control circuit is...
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7271552 |
Ballast circuit for operating a gas discharge lamp
Ballast circuit for operating a gas discharge lamp, comprising a half-bridge DC-AC converter having a voltage controlled oscillator (VCO) for alternately switching the switches (T 1 ; T 2 ) of said...
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7271642 |
Charge pump drive circuit for a light emitting diode
Through operated alternately between a charging phase and a discharging phase, a charge pump converts an input voltage source into a drive voltage for being supplied to a light emitting diode. A...
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7270790 |
Sterilizer monitoring and controlling system and method
A system and method are provided for monitoring and/or controlling a sterilization system. Briefly described, in architecture, the system can be implemented as follows. A current transformer is...
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7271550 |
Dimmer circuit arrangement
A dimmer circuit arrangement is disclosed including a second control circuit ( 40 ) for controlling the operation of a triac ( 50 ) for delivering current to a load ( 60 ), and a first control...
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7271549 |
Current balancing circuit for a multi-lamp system
The present invention uses one or more transformers disposed between an inverter driver to drive a plurality of lamps. Each transformer has a first coil and a second coil magnetically coupled to...
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7268501 |
Multi-lamp driving circuit
A multi-lamp driving circuit includes a transformer, a first lamp, a second lamp, a current/voltage converting circuit and a voltage/current converting circuit. Transformer includes a secondary...
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7268500 |
Control device for multiple lamp currents of liquid crystal display backlight source
A control device for multiple lamp currents of a liquid crystal display (LCD) backlight source, comprising an electronic power switch, a transformer, an inverter and an integrated circuit (IC)...
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7265500 |
Backlight assembly for directly backlighting displays
A backlight assembly comprises a plurality of linear light sources arranged in parallel behind a display screen. The plurality of linear light sources is divided into a first group and a second...
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7265502 |
Dimming apparatus of light emitting unit
The present invention discloses a dimming apparatus of a light emitting unit that uses a sensor to detect an external signal such as sound, shadow, temperature or digital image for changing the...
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7265503 |
Applications of halogen convertor 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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7265501 |
Mobile light
A mobile light is disclosed that produces a high level of illumination without glare using the DC power of a vehicle's battery and charging system. The mobile light uses a high-intensity discharge...
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7265499 |
Current-mode direct-drive inverter
An efficient and flexible current-mode driver delivers power to one or more light sources in a backlight system. In one application, the current-mode driver is configured as an inverter with an...
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7265681 |
Light emitted diode driving apparatus
A driving apparatus includes a DC-to-DC converter, a first LED series, a second LED series, a first constant-current circuit, a second constant-current circuit, and a feedback circuit. The DC-to-DC...
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7262554 |
Lamp with integral voltage converter having phase-controlled dimming circuit with hysteresis control for reducing RMS load voltage
An incandescent lamp includes a lamp voltage conversion circuit within the lamp and connected to a lamp terminal, where the voltage conversion circuit converts a first line voltage at the lamp...
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7262560 |
Regulating a light source using a light-to-frequency converter
An apparatus and method thereof for regulating a light source are described. The apparatus includes a light-to-frequency converter that converts light received from the light source into a signal...
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7262558 |
Lamp current control device
A lamp current control device includes an electronic power switch, a transformer, a current transformer and a pulse width modulation (PWM) IC. The transformer has its primary side connected to the...
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7262559 |
LEDS driver
The power supply ( 20 ) for LEDs provides power to a LED light source ( 10 ) having a variable number of LEDs wired in series and/or in parallel. The power supply ( 20 ) uses current and voltage...
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7262752 |
Series led backlight control circuit
A light emitting diode control circuit provides a plurality of series light emitting diodes (LEDs) that are fault tolerant, temperature compensated, and temperature derated. The series LEDs may be...
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7262561 |
Method for controlling power supply through multiple modulation modes
A method for controlling power supply through multiple modulation modes aims to control an inverter of a selective characteristic through a cycle control signal of varying modulation modes to...
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7259524 |
Apparatus and methods for regulating delivery of electrical energy
Apparatus and methods for regulating delivery of electrical energy to a lighting load are disclosed. An electrical waveform is received from a source of electrical energy. An integration value is...
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7259523 |
Circuit arrangement
In a bride circuit comprising a lamp choke that might partially saturate during the ignition of the lamp, at least one of the switches is switched off when the amount of charge displaced through it...
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7259525 |
High efficiency switching LED driver
The present invention provides a LED driver for control the brightness of the LED. An inductor and a switch are connected in serial with the LED for control the current of the LED. A control...
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7259527 |
Stepped dimming ballast for fluorescent lamps
A stepped dimming ballast comprising a filter and rectifier circuit ( 1 ), a DC high voltage stabilizing circuit ( 2 ), a frequency control and switch circuit ( 3 ), a load current feedback circuit...
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7256556 |
Equipment and methods for emergency lighting that provides brownout detection and protection
The present invention relates to systems, equipment and methods that provide emergency lighting and allow the detection of brownout conditions. One aspect of the present invention is an emergency...
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7256555 |
Backlight driving method
A method of driving a backlight unit is provided. The backlight includes a plurality of lamps sequentially turned on/off. Each of the plurality of lamps is periodically turned on for a...
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7256689 |
Flashing device for vehicle
A flashing device for a vehicle includes a power filtering unit connected to a power source for outputting a negative voltage after filtration, a detecting unit for detecting the negative voltage...
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7253567 |
Low-visual noise, jitterized pulse width modulation brightness control circuit
A low visual noise, jitterized pulse width modulation brightness control circuit is provided. The circuit uses a brightness control signal generating unit to receive a brightness adjusting signal...
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7253566 |
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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7253812 |
El display driver and El display
A pulse having a width of 20H is inserted into STV in correspondence with a vertical blanking period (a period of 21 H), and the speed of CKV is increased to 12 times the original speed over the...
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7253564 |
Lamp current balancing device
A lamp current balancing device comprises an electronic power switch, a transformer, a current transformer and a pulse width modulation (PWM) IC; the transformer having a primary side connected to...
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7253565 |
Apparatus for supplying power, backlight assembly and liquid crystal display apparatus having the same
Disclosed are a power supplying apparatus, a backlight assembly and an LCD apparatus having the same. A control section outputs a switching signal so as to control an output of a constant current...
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7253569 |
Open lamp detection in an EEFL backlight system
A method according to one embodiment may include supplying power to plurality of External Electrode Fluorescent Lamps (EEFLs). The method of this embodiment may also include generating signals...
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7250732 |
High pressure discharge lamp control system and method
A system for providing a controllable current to a high intensity discharge lamp is provided. The system includes a current controller that is configured to receive input power and to provide an...
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7250806 |
Apparatus and method for generating an output signal that tracks the temperature coefficient of a light source
An apparatus and method for generating an output signal that tracks the temperature coefficient of a light source are provided. A light source temperature coefficient tracking mechanism (e.g., a...
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7250810 |
Multi-mode charge pump drive circuit with improved input noise at a moment of mode change
A multi-mode charge pump drive circuit has a multi-mode charge pump, a switch control circuit, a current regulation circuit, an error amplifier, a variable resistance unit, and a mode selection...
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7247991 |
Dimming ballast and method
A ballast lamp circuit and method of operation is disclosed. The ballast lamp circuit comprising an inverter circuit and cathode heating circuit, wherein a lamp current, generated by the inverter...
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7248000 |
Operating device and method for operating gas discharge lamps
The invention relates to an operating device for operating high-pressure gas discharge lamps. Of particular concern is an operating device having a controller for start-up of high-pressure gas...
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7247998 |
Transient detection of end of lamp life condition apparatus and method
A sensor system adapted to detect unwanted transients in the primary side of a luminous lamp load driving circuit and effect a change in operation of the driving circuit. A detection circuit is...
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7247997 |
Electroluminescent lamp driving circuit and method
A driving circuit for driving an electroluminescent lamp is disclosed. The driving circuit includes an alternating current (AC) voltage generator for providing at an output an AC output voltage...
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7248002 |
Light emission control apparatus and light emission control method with temperature-sensitive driving current control
A temperature profile storage unit stores a Vf-Ta table showing a relationship between a forward voltage Vf and am ambient temperature Ta of an LED element, and a Ta-Ifmax table showing a...
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7247999 |
Dimmer for use with a three-way switch
A smart dimmer for controlling the intensity of a lighting load from a source of AC power is operable to replace one of the three-way switches in a standard three-way lighting system without the...
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