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7102297 |
Ballast with end-of-lamp-life protection circuit
An electronic ballast ( 10 ) for powering a lamp load comprising an even number of gas discharge lamps ( 30,32, . . . ,34,36 ) includes an inverter ( 300 ), an output circuit ( 400 ), and a...
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7098605 |
Full digital dimming ballast for a fluorescent lamp
A lamp control circuit is described, containing a power factor corrector, coupled to it a digitally controlled ballast, having power devices. The digitally controlled ballast is capable of powering...
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7098606 |
Electronic ballast with open circuit voltage control and cable compensation
An electronic ballast uses a voltage sampling circuit and a voltage control circuit to limit the open circuit voltage of the ballast. A lamp voltage sensing circuit is provided that uses a voltage...
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7098607 |
Electronic ballast with lossless snubber capacitor circuit
An improved high input voltage instant start electronic ballast uses a substantially lossless snubber circuit. The substantially lossless snubber circuit is incorporated into the ballast to reduce...
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7098727 |
Boosting circuit
A boosting circuit is provided that includes a reference voltage generating circuit unit to generate a reference voltage, a voltage boosting circuit to output a given boosting voltage, and a...
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7098608 |
Lossless circuit for sampling of lamp voltage
An electronic ballast has a resonant tank circuit that includes a tank inductor and a tank capacitor connected in series. Lossless sampling of the output voltage of the electronic ballast is...
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7098604 |
Solar powered lamp having an auxiliary startup device
Disclosed is a solar powered lamp adopting a cold-cathode fluorescent lamp and an auxiliary startup device which can improve the efficiency of the voltaic-photo transformation when lighting the...
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7098609 |
Discharge lamp driving circuit provided with discharge detecting pattern
In a discharge lamp driving circuit comprising: a transformer having one end of a discharge lamp connected to one end of the secondary side thereof; a current-voltage converting circuit provided at...
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7098612 |
Frequency synchronization device for LCD lamps
A frequency synchronization device for a large LCD having a plurality of lamps as a background light source is disclosed. The device comprises a power amplification unit wherein one power...
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7098610 |
Incandescent light power controller with predetermined off-state impedance
An incandescent light bulb life extender circuit is designed to attach to the screw base of a conventional light bulb or incorporated in series with the AC powering the bulb. The circuit employs a...
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7095185 |
Fluorescent lamp electronic ballast
A fluorescent lamp electronic ballast includes a power factor correction flyback circuit and an inverter ballast circuit. The power factor correction flyback circuit is composed of a rectifier...
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7095186 |
Control circuit for controlling an electron-emitting device
A control circuit for controlling an electron-emitting device is formed to draw, with a voltage applied, an excitation current being related to a number of electrons emitted. The inventive control...
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7093140 |
Method and apparatus for configuring a voltage regulator based on current information
A computer system includes a voltage regulator that supplies power to a component. The component may provide a signal indicating an amount of current the component consumes under a high utilization...
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7091674 |
Rare gas fluorescent lamp device
A lighting apparatus comprising a branch circuit wherein a light receiving cycle signal branches into a synchronizing signal and a light controlling signal, a frequency recognizing circuit which...
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7091874 |
Temperature compensated warning light
A temperature compensated warning light includes banks of high output light emitting diodes (LED's), one or more drivers connecting the LED banks to a control processor, and a temperature sensor...
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7091673 |
Discharge lamp lighting device
A discharge bulb ballast has a control circuit ( 11 ) that includes a turning point detecting unit ( 101 ) for detecting a turning point at which a bulb voltage starts rising after switching on a...
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7088059 |
Modulated control circuit and method for current-limited dimming and color mixing of display and illumination systems
A control circuit for a lighting system allows analog control over a first range of illumination intensities in which the intensity of the illumination source varies in proportion to the voltage...
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7088058 |
Image display
An image display device which has a display element that optically modulates an incident light for displaying an image. A lamp is a light source of the incident light to the display element. A lamp...
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7088055 |
High efficiency controller of a gas-filled light emitting tube
The present invention relates to a high-efficiency controller of a gas-filled light producing tube; the controller can produce signals in a form of outputs of high-frequency sine wave to soft-start...
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7088080 |
Power supply circuit for vacuum fluorescent display
A power supply circuit for a vacuum fluorescent display includes a boosting coil, input terminal, switching transistor, PWM control circuit, boosting circuit, first filament terminal, and second...
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7084582 |
Electronic ballast system having emergency lighting provisions and electronic chip
An electronic ballast system is intended to operate one or more fluorescent lamps and a subsystem with universal input from 108V to 305V, a battery, and battery charger, associated logic, and a...
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7084585 |
Discharge lamp lighting apparatus
The discharge lamp lighting apparatus includes a high-voltage generating coil connected in series to a discharge lamp for applying a high voltage to the discharge lamp to turn on the lamp, an...
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7084584 |
Low frequency inverter fed by a high frequency AC current source
Apparatus driven by high-frequency AC current source, for driving an electric load with low-frequency AC current, that comprises a current splitting inductor, for generating, from the...
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7084583 |
External electrode fluorescent lamp, back light unit using the external electrode fluorescent lamp, LCD back light equipment using the back light unit and driving device thereof
The present invention relates to an external electrode fluorescent lamp which can provide higher degree of and more improved uniformity of brightness than those of conventional ones, and to a LCD...
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7084578 |
System and method for preventing acoustic arc resonance in a HID lamp
A method of preventing acoustic arc resonance (AAR) in a high frequency electronic ballast for a High-Intensity-Discharge (HID) lamp, includes the step of providing a phase modulated signal to the...
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7081720 |
Driver circuit and method for driving electroluminescent lamp to emit light at brightness set level
A method for driving an electroluminescent lamp to emit light at a brightness set level includes providing a variable bias voltage to the electroluminescent lamp. The variable bias voltage is...
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7081721 |
Projection type video display apparatus
Disclosed is a projection type video display apparatus comprising input means for inputting a power saving mode setting command, average luminance level detection means for detecting the average...
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7081709 |
Method and apparatus for lighting a discharge lamp
A reliable and efficient circuit for lighting a discharge lamp is described. An inverter accepts a direct current supply voltage and outputs an alternating current lamp voltage to drive the...
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7078870 |
Simplified topology for HID lamps
An HID ballast includes a flyback power converter with a simplified topology that permits power factor correction while supplying constant output power to drive an inverter supplying low frequency...
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7075252 |
LED driver circuit
An LED driver circuit that includes first and second switching mechanisms. The first mechanism is in a first switching condition when a source voltage is at or below a first threshold and moves to...
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7075245 |
Driving circuit for multiple cold cathode fluorescent lamps backlight applications
The present invention provides a driving circuit for driving a light source. The driving circuit includes a serial-arranged transformers system having multiple primary windings and secondary...
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7075250 |
Three-component protective head gear powered by a rechargeable battery
A three-component, protective headgear or helmet is provided with a battery-powered LED head lamp, which may be used by construction workers, search and rescue persons, cyclists, police, fireman,...
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7075251 |
Universal platform for phase dimming discharge lighting ballast and lamp
A ballast, or power supply circuit, for gas discharge lamps of the type using IC control based gate-drive circuitry for controlling a pair of serially connected switches of a d.c.-a.c. inverter....
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7075246 |
Discharge lamp illumination circuit
A discharge lamp illumination circuit 1 has a DC-AC conversion circuit 3 which effects AC conversion and boosting upon receipt of a DC input, and a starter circuit 4 for supplying a start-up...
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7075254 |
Lighting ballast having boost converter with on/off control and method of ballast operation
A ballast for driving a gas discharge lamp comprising a rectifier stage having an alternating current (AC) input and providing a rectified output voltage, a boost converter stage receiving the...
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7075237 |
Illumination control apparatus and failure detecting apparatus
In an illumination control apparatus which drives headlamps in a PWM mode and automatically lights them at low power in a vehicle when the DRL executing condition is held, failure in a PWM-drive...
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7071625 |
LED illuminator with capability of stable brightness
An LED illuminator with the capability of stale brightness, which has the function of emergent lighting and night lighting, is disclosed. The disclosed LED illuminator has a charging unit, a...
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7071634 |
Lighting control device having improved long fade off
A lighting control device for controlling the light intensity level of at least one lamp is disclosed. The lighting control device includes a microcontroller and a user-actuatable switch controller...
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7071632 |
Discharge lamp starter
A discharge lamp starter includes a DC/DC converter. The DC/DC converter includes a forward section for producing a first output voltage that is determined by a power supply voltage and a turn...
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7071762 |
Supply assembly for a led lighting module
A supply assembly for an LED lighting module includes a control switch for supplying a constant current to the LED lighting module. A dual switching signal composed of low frequency bursts of high...
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7071630 |
Closed loop magnetic boost LED driver system and method
Current is delivered to a load using a closed-loop boost circuit topology that is suitable for LED driver applications. An inductor is charged when a transistor is active during a first operating...
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7067993 |
Light source control system
A system and method for controlling an optical light source is provided. A current source drives the light source, while the voltage across and the current through the light source is measured. The...
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7067991 |
Feedback sampling control circuit for lamp driving system
The invention discloses a feedback sampling control circuit for a lamp driving system having a feedback loop, in that the feedback sampling control circuit includes a switch and an effective...
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7067982 |
Deriving power for an external device from a fluorescent light power source
Systems and methods are provided for deriving power for an external device from a circuit of a fluorescent light. A first circuit supplies power from a fluorescent light power source to a...
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7067989 |
Modularized inverter control circuit
A modularized inverter control circuit makes use of a push-pull type control IC to connect other accessory circuit units, and is packaged and disposed on a printed circuit board to accomplish...
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7067992 |
Power controls for tube mounted LEDs with ballast
A power saving device for a light emitting diode (LED) lamp mounted to an existing fixture for a fluorescent lamp having a ballast assembly and LEDs positioned within a tube and electrical power...
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7067986 |
Frequency controlled lighting system
A method and apparatus for illuminating lighting elements in one or more predetermined patterns. A preferred frequency controlled lighting system implementing this method includes a motion switch,...
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7064499 |
Method for operating at least one low-pressure discharge lamp and operating device for at least one low-pressure discharge lamp
The invention relates to a method for operating at least one low-pressure discharge lamp using an inverter, during the operation of the at least one low-pressure discharge lamp the occurrence of a...
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7064496 |
State detection device
A state detection device is disclosed that is for detecting driving states of plural loads which are connected with each other in parallel and are driven by a driving unit. The state detection...
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7065303 |
Efficient low power optical source driver and method and optical systems and devices using same
Systems, apparatuses, and methods for driving an optical source with a current source. The optical source driver has a primary control loop having a DC—DC converter and an operational amplifier,...
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