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7154228 |
Ballast for high pressure discharge lamp
In a ballast circuit for supplying a high pressure discharge lamp and comprising an up-converter and a bridge circuit, the output voltage of the up-converter is controlled at a higher level...
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7154232 |
Ballast control IC with multi-function feedback sense
A multi-function feedback sense input in an electronic ballast control indicates a number of lamp faults on the basis of lamp parameters exceeding specified thresholds. An end of life detection is...
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7154229 |
Electronic ballast with load shed circuit
An electronic ballast ( 10 ) for powering at least one gas discharge lamp ( 30 ) includes a current-fed resonant inverter ( 300 ) and a load shed circuit ( 600 ). Inverter ( 300 ) ordinarily powers...
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7154234 |
Low voltage regulator for in-line powered low voltage power supply
The invented voltage regulator is a solid state low voltage regulator for in-line power lines for LED arrays and incandescent lamps, preferably low-voltage halogen lamps. The invented voltage...
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7154227 |
Circuit arrangement for operating at least one light source
A circuit arrangement for operating at least one light source. Cost-effective power factor correction of the system input is achieved by a combination of a charge pump and a valley-fill circuit....
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7154231 |
Gas discharge lamp dimming control method
A gas discharge lamp dimming control method aims to provide a dimming period after a start period when a gas discharge lamp is ignited. The dimming period has a duty voltage set initially or...
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7151346 |
Method and apparatus for optimizing power efficiency in light emitting device arrays
The disclosed embodiments provide a method and apparatus for optimizing power efficiency in liquid crystal displays. A microprocessor or embedded microcontroller associated with circuit control...
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7145293 |
Electronic ballast having resonance excitation for generating a transfer voltage
The invention relates to an electronic ballast, to an illumination device including the electronic ballast and an associated high-pressure discharge lamp, and to a corresponding operating method...
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7145295 |
Dimming control circuit for light-emitting diodes
A dimming control circuit generates a dimming control signal for determining brightness of at least one light-emitting diode. The dimming control signal has a plurality of bright-dark cycles, each...
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7145294 |
Detecting apparatus for cold cathode lamp
A detecting apparatus for a lamp is disclosed. The detecting apparatus includes a central processing unit for receiving a spectrum signal and converting the spectrum signal into a digital signal, a...
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7144130 |
Illumination device
An illumination apparatus for illumination of light by emitting light from LED for each of RGB colors capable of optionally setting a color temperature and controlling the brightness after the...
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7141937 |
High-pressure discharge lamp operation device and illumination appliance having the same
A full bridge circuit including four switching elements (Q 1 to Q 4 ) is alternated with a high switching frequency and a series-connected resonance circuit ( 5 ) including an inductor (L 2 ) and...
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7141940 |
Method and control circuitry for providing average current mode control in a power converter and an active power filter
Control circuitry uses modified average current mode control to regulate average current through an inductor of a power converter. Control circuitry uses modified average current mode control to...
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7141939 |
Power supply circuit that is stable against sudden load change
A power supply circuit for supplying power to a load includes an antenna which receives electric power, a rectifier coupled to the antenna and configured to convert an alternating voltage supplied...
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7141933 |
Systems and methods for a transformer configuration for driving multiple gas discharge tubes in parallel
An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively...
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7141938 |
Power control device, apparatus and method of controlling the power supplied to a discharge lamp
The present invention relates to a power control device for controlling the output power supplied to a discharge lamp operated by an electrical power supply, comprising power level determining...
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7139500 |
Image fusing device and image forming apparatus
This invention is intended to control the amount of power to be supplied to a fusing heater below a maximum applicable current value. The engine controller supplies electricity to both of two...
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7138770 |
LED driving circuit
An LED driving circuit that is directly activated by an AC power supply is disclosed. A driving circuit has a first and second pair of opposite branches. The first pair of opposite branches...
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7138769 |
Device for operation of a high pressure discharge lamp and a projector device
A device for operating a discharge lamp of the alternating current operating type has a high pressure discharge lamp with a silica glass discharge vessel in which a pair of opposed electrodes are...
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7135825 |
LED power supply device
An LED power supply device has a loop circuit formed by a switching circuit, an LED and a comparison circuit, and a reference voltage generation circuit for providing reference voltage to the...
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7132803 |
High efficiency 4-lamp instant start ballast
An instant-start ballast for a multiple gas discharge lamp fixture has a single half-bridge inverter that is used to drive at least two series resonant output circuits. Each series resonant output...
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7129647 |
Electronic ballast with programmable processor
An electronic ballast circuit includes a programmable processor. The processor is programmed to vary operating parameters of the ballast circuit to accommodate operation of different types and/or...
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7129653 |
Self-contained, self-snubbed, HID dimming module that exhibits non-zero crossing detection switching
A protection circuit for an HID dimming circuit is provided. A resistive component limits the initial current after a relay closes and current flows from a charged capacitor to a second capacitor....
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7129652 |
System and method for driving a plurality of loads
A system for controlling a plurality of load devices includes a high-side system operative to source current relative to at least two associated outputs. A low-side system is operative to sink...
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7129650 |
Lighting apparatus for high intensity discharge lamp
A lighting apparatus of high intensity discharge lamp comprises a DC power source, a series connection of a first and a second transistors; a series connection of a first and a second capacitors...
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7126287 |
Lamp with integral voltage converter having phase-controlled dimming circuit with fuse-resistor network 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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7122974 |
Light quantity adjusting method, light quantity adjusting apparatus, and image forming apparatus
A light quantity adjusting method is used for driving a light emitting device with two drive current levels. The drive current levels are controlled by the first set data and the second set data,...
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7122973 |
Light-generating apparatus control system
A control system for a light-generating apparatus can include a control cyclically operating a switching element in series with the circuit including the apparatus's power source and light. Upon...
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7122970 |
Method for testing OLED substrate and OLED display
A method for testing an OLED substrate comprises: the first step of obtaining a first current value passing through a switching element group connected to a selection signal line; the second step...
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7122975 |
Filament lamp light quantity control method and filament lamp light quantity control unit and filament lamp light source unit
The invention relates to a light source unit control method and a light source control unit, and a light source unit comprising a filament lamp with a characteristic of having a light quantity...
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7122971 |
Driver circuit for driving a plurality of DC lamp strings
A driver circuit for a DC light source supplies a voltage generated by a DC-to-DC converter for a plurality of lamp strings connected in parallel and a plurality of driving currents generated by a...
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RE39341 |
Apparatus for lighting fluorescent lamp
A fluorescent lamp lighting apparatus in accordance with the present invention has first switching means (M 1 ) driven by a high-voltage-side pulse signal input from a drive-signal generation...
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7119499 |
Switching power device
A switching power device uses a non-capacitor flyback converter circuit not provided with a smoothing input capacitor having a large capacity. Therefore, a power harmonic can be suppressed and a...
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7119497 |
Dimmer for resistive or capacitive loads
A power dimmer for an A.C. load comprising, between two terminals, two one-way switches connected in anti-parallel and controllable to be turned off and turned on, each switch being controlled by a...
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7119498 |
Current control device for driving LED devices
A current control device for driving LED devices uses a switched-mode current control loop inside of an output intensity low-frequency pulse width modulation (PWM) control loop. This allows...
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7119501 |
Dynamic color mixing LED device
A dynamic color mixing LED device that includes a plurality of light emitting diode units. Each light emitting diode unit includes e.g. a first LED of a first color (e.g. red) and a second LED of a...
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7119495 |
Controlling a light assembly
A method and apparatus for operating a light assembly with fewer peripheral devices than is currently required is presented. The apparatus of the invention includes a lamp unit, a current...
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7119493 |
Control of electroluminescent displays
A controller for use with a multi-segment electroluminescent display 1 . Control signals C 1 –CN control a plurality of half H-bridges H and Hc, the terminals of the half H-bridges being...
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7116063 |
Dimmable discharge lamp lighting device
A discharge lamp lighting device includes a high frequency power supply for supplying high frequency power to the discharge lamp via a first impedance element, a DC power supply for applying DC...
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7116052 |
Vehicular lamp
Electric current supplied to light source rows of a vehicular lamp is controlled appropriately. The vehicular lamp includes: a plurality of semiconductor light emitting devices connected in...
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7115888 |
LED driving semiconductor circuit and LED driving apparatus including the same
A LED driving semiconductor circuit of the present invention includes a first input terminal connected to a light-emitting diode, a switching device block having a first FET and a first switching...
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7116061 |
Brightness controllable flashlights
Flashlights having selectively controllable brightness levels, a preferred embodiment of which comprises in combination: a battery; a light emitter assembly; a switch in circuit with the battery...
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7112930 |
Device and method for detecting high voltage
A non-contact voltage detecting method and device are provided. The non-contact voltage detecting device includes a discharge lamp having an excitation voltage and a lighting voltage applied...
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7109666 |
Lighting device for a dielectric barrier discharge lamp
A lighting device for dielectric barrier discharge lamp according to the embodiment of the present invention includes a pulse number judging circuit 16 . The judging circuit 16 is supplied with...
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7109659 |
High-intensity discharge lamp ballast and method for operating high-intensity discharge lamp
A high-intensity discharge lamp ballast includes a lamp operation unit configured to supply power from a power source to a high-intensity discharge lamp, a lamp voltage detector configured to...
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7106007 |
Flashlight lamp circuit with automatic light adjustment
A flashlight lamp circuit with automatic light adjustment includes a flashlight charging unit for controlling charging of a main capacitor, a flashlight activation unit activating the flashlight...
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7102300 |
Ballast device with built-in power supply and operation thereof
A ballast device having active ballasting circuit and method thereof, which are used for controlling a HID lamp's power supply real-timely and steadily, comprising: a power supply unit in said...
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7102295 |
Electronic device with illumination circuit and EL device utilizing the same
An electronic device having an illumination circuit. The illumination circuit utilizes an AC current of an AC driving device to drive an illumination device such as an electroluminescent lamp and...
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7102299 |
Electronic circuits
An electronic circuit for providing a high voltage alternating current supply from a DC supply to an electroluminescent lamp. The circuit includes an inductive element and an output switching...
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7102298 |
Integral lamp
An integrated lamp/lamp electronics unit includes a lamp having a first end with first end electrical terminals, and a second end with second end electrical terminals. An end cap having an interior...
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