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7193368 |
Parallel lamps with instant program start electronic ballast
In a current fed electronic ballast multiple lamps are operated in a parallel circuit arrangement. The ballast provides pre-heating to the cathodes of the lamps for a period of time before an open...
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7193371 |
Electronic ballast having timing unit correction
The invention relates to an operating method and an electronic ballast (EVG) for operating a light-producing apparatus (L), for example a discharge lamp. In this case, an internal timing unit in...
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7190119 |
Methods and apparatus for optimizing a substrate in a plasma processing system
An arrangement for processing a semiconductor substrate in a plasma processing system is disclosed. The arrangement includes providing a RF coupling structure having a first terminal and a second...
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7190124 |
Two-wire dimmer with power supply and load protection circuit in the event of switch failure
A dimmer circuit provides AC power to an inductive lighting load in series with the dimmer circuit. A bidirectional semiconductor switch has a control electrode with a control signal for...
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7187140 |
Lamp current control using profile synthesizer
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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7187136 |
Method and circuit for regulating power in a high intensity discharge lamp
A circuit for controlling power to a high intensity discharge lamp is disclosed. The circuit according to one embodiment of the invention comprises a rectifier circuit coupled to receive an...
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7187137 |
Ballast with output ground-fault protection
A ballast ( 10 ) for powering at least one gas discharge lamp ( 40 ) includes an EMI filter ( 100 ), a full-wave rectifier ( 200 ), a DC-to-DC converter ( 300 ), an inverter ( 400 ), an output...
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7183723 |
PWM illumination control circuit with low visual noise for driving LED
A pulse width modulation (PWM) illumination control circuit with a low visual noise for driving a light-emitting diode (LED) is provided. An illumination control pulse-generating unit is used to...
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7183726 |
Cold cathode fluorescent lamp drive apparatus and method
A cold cathode fluorescent lamp drive apparatus for lighting a cold cathode fluorescent lamp is disclosed. The cold cathode fluorescent lamp drive apparatus includes an abnormal current holding...
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7183714 |
Ballast with relamping circuitry
An apparatus for detecting the reconnection of a lamp filament to an electronic ballast driving a fluorescent lamp. A control circuit controls an inverter circuit to providing power to a filament...
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7183725 |
Backlight inverter system and control method for starting the same
A backlight inverter system and a start-up control method thereof to apply an optimal start-up voltage to a backlight lamp according to an environment temperature, such that the backlight lamp is...
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7180247 |
Load control circuit
A load control circuit enabling miniaturization of a brightness adjustment system. The load control circuit includes a variable resistor for generating a reference potential. A first duty signal...
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7176638 |
Discharge lamp lighting circuit
A discharge lamp lighting circuit has a structure of a voltage resonance type including a transformer and a switching element to be provided on a primary side thereof as a DC—DC converting...
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7173384 |
Illumination device and control method
A description is given of an illumination device which emits mixed-color light containing light of at least two different color channels (R, R 1, G, G 1, B, B 1 ). The illumination device...
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7173379 |
Incremental distributed driver
An incremental distributed driver divides power delivered to multiple lamps into two power delivery stages. The first power delivery stage operates in voltage-mode to provide a partial operating...
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7173381 |
Backlight unit for liquid crystal display
The invention provide a cost effective way of determining the status of a light emitting device, such as a light emitting device in a non-emitting display device. The apparatus includes a plurality...
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7170235 |
Circuit arrangement with a separate resonant igniter for a high-pressure discharge lamp
In a bridge circuit for operating a high pressure discharge lamp an additional switching element, a control circuit for driving the additional switching element, a resonant inductor and a resonant...
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7164239 |
Discharge lamp ballast circuit
A discharge lamp ballast circuit is provided which can prolong the life of a discharge lamp, and reduce the size and cost of the ballast circuit. It generates from an AC voltage boosted by a DC-AC...
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7161307 |
Power factor correction apparatus with embedded DC—DC converter
A power factor correction apparatus with an embedded direct-current to direct-current (DC-DC) converter is provided. The apparatus includes a power factor controller, a high-voltage adapter and a...
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7161309 |
Protecting a cold cathode fluorescent lamp from a large transient current when voltage supply transitions from a low to a high voltage
A compensation circuit for protecting a lamp from a large transient current. The compensation circuit may include a saw tooth generator configured to generate a saw tooth signal with an amplitude...
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7161310 |
Backlight apparatus for liquid crystal display
A secondary winding W 2 of a step-up transformer of a self-excited inverter 2 is grounded at the midpoint thereof. High-frequency voltages differing in polarity from each other are outputted...
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7161306 |
Multi-phase input ballast with dimming and method therefor
An apparatus and method for powering a lamp connected to a ballast circuit. The ballast circuit is connected to a first alternating current (AC) source having a first phase and to a second AC...
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7157863 |
Device and method for the multi-phase operation of a gas discharge or metal vapor lamp
The present invention describes an apparatus and methods for operating one or more gas arc lamps or metal vapor, wherein a rectified multiphase voltage is directly used by an electronic ballast...
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7156525 |
System and method for managing projector bulb life
Projector bulb life is managed to achieve desired performance parameters, such as a maximum life mode or maximum brightness mode, by sensing bulb luminance and applied the sensed luminance with a...
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7154921 |
Light emitting element driving circuit, communication device and light emitting element driving method
A light emitting element driving circuit drives a surface-emitting element, and the light emitting element driving circuit is equipped with a bias current driving circuit that supplies a generally...
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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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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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7151345 |
Method and apparatus for controlling visual enhancement of luminent devices
The disclosed embodiments provide a method and apparatus for visual enhancement of liquid crystal displays. A microprocessor or embedded microcontroller associated with visual enhancement circuit...
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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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7148633 |
DC/AC inverter
A DC/AC inverter provided for transforming a DC voltage source into an AC power source, wherein the AC signal is used for driving a fluorescent lamp. The inverter comprises a half-bridge switch...
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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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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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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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7132802 |
Method for varying the power consumption of capacitive loads
Method for varying the power consumption of capacitive loads, in particular compact fluorescent lamps which are operated using a phase-gating dimmer by a converter (step-up converter). According to...
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7129648 |
Interface circuit for operating capacitive loads
An interface circuit suitable for operating capacitive loads such as electric ballasts for lamps at a mains supply circuit, in particular a phase gating dimmer. The interface circuit short-circuits...
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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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7126286 |
Lamp assembly, back light assembly having the same, display device having the same, and method of driving lamps
A lamp assembly includes a lamp and a lamp driving device. The lamp includes a body and first and second electrodes. The body converts invisible ray generated by a discharge into visible ray, and...
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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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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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7119494 |
Circuit designs and control techniques for high frequency electronic ballasts for high intensity discharge lamps
The present invention provides an electronic ballast for a high intensity discharge lamp such as a metal halide lamp. The ballast includes an inverter and a resonant circuit with an ignition...
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7119500 |
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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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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7116062 |
Method of soft-starting a switching power supply including pulse width modulation circuit
A method of operating a power controller that converts a line voltage to an RMS load voltage includes a soft start in which a duty cycle of a pulse width modulation circuit is gradually increased...
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7112929 |
Full-bridge and half-bridge compatible driver timing schedule for direct drive backlight system
A driver circuit or controller flexibly drives either a half-bridge or a full-bridge switching network in a backlight inverter without modification, redundant circuitry or additional components....
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7110267 |
Circuit and method of igniting a high-pressure lamp
The invention relates to an electronic circuit for igniting a high-pressure lamp. A resonant circuit 13 of the circuit is used to supply the ignition voltage for the high-pressure lamp. To enable...
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7109668 |
Electronic lighting ballast
An electronics enclosure has a mains input and a lamp output. A power factor correction circuit is installed in the enclosure, to provide a DC output voltage. An inverter is also installed in the...
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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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