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7619371 |
Inverter for driving backlight devices in a large LCD panel
Two out-of-phase inverters are used for driving a backlight for large LCD panels. The lamp currents of each inverter are regulated to substantially the same level to ensure the same brightness in...
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7619368 |
Power source apparatus
A power source apparatus is disclosed in this invention, specifically a power source apparatus comprising a voltage amplitude control unit that employs an active power factor corrector to control...
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7619365 |
Load control device having a variable drive circuit
A load control device for controlling the amount of power delivered to an electrical load from a source of AC power comprises a controllably conductive device and a variable gate drive circuit. The...
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7615941 |
Apparatus and method for maximizing the longevity of arc tube bulbs during pulsing operation
Heating or powering a filament less light bulb, and preferably a High Intensity Discharge light sufficiently close to steady state temperature and then pulsing the current, thereby improving and or...
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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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7615933 |
Pulsed dielectric barrier discharge
A method of generating a fast-rise time voltage step to produce an overvoltage condition for a dielectric barrier plasma discharge involves providing a pair of electrodes spaced apart by an...
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7609006 |
LED light string with split bridge rectifier and thermistor fuse
A string of lights has an electrical plug at one end and a receptacle at the other end and plural light-emitting diodes (LEDs) in series with a negative temperature coefficient (NTC) thermistor....
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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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7605544 |
Current balancing circuit
A current balancing circuit for first and second lamp sets includes a step-up transformer and a current balancer. The step-up transformer is adapted to be coupled to a power supply for receiving an...
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7598682 |
Current regulator apparatus and methods
An apparatus according to the present invention provides regulated pulsed current to an LED from a voltage source such as a rectified AC voltage. The present inventions provide methods for...
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7598677 |
Multiple failure detection shutdown protection circuit for an electronic ballast
A shut-down circuit configured for use with an electronic ballast coupled to a lamp in a control path includes a device for sensing the electrical energy associated with the control path, and a...
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7595596 |
Power-saving control circuit and method for OLED panel
The present invention discloses a power-saving control circuit for an OLED panel, comprising: a plurality of OLEDs respectively located in a corresponding plurality of paths; a current amount...
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7592753 |
Inductively-powered gas discharge lamp circuit
An inductively powered gas discharge lamp assembly having a secondary circuit with starter circuitry that provides pre-heating when power is supplied to the secondary circuit at a pre-heat...
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7589475 |
Electric lamp with enhanced dependability
The lamp comprises at least one light-emitting diode and an electronic power switch connected in series between a power source and the light-emitting diode. The electronic power switch is...
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7586270 |
Circuit and method for the operation of miniature high pressure short-arc lamps using alternating current
An embodiment of the invention is concerned with a circuit and a method for the generation and operation of the plasmas in High Pressure Short Arc Lamps having miniature dimensions using...
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7586266 |
Driver circuit for an HID lamp and method for operating an HID lamp
The present invention relates to a driver circuit for an HID lamp having a circuit arrangement for applying a radiofrequency signal for the purpose of starting the lamp and for applying a...
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7586265 |
Illumination device
An illumination device is described that includes a light source that is an organic light-emitting diode and a control device capable of adjusting the current through the organic light-emitting...
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7579790 |
Multiple gas discharge lamp interleave trigger circuit
Embodiments are disclosed for apparatus and methods for increasing the reliability of the flash discharge response in pulsed gas discharge lamps. One embodiment includes a system comprising two gas...
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7579784 |
Switching power supply and its control circuit, and electronic apparatus employing such switching power supply
A control circuit for controlling a switching element in a switching power supply by generating a switching signal is disclosed. The control circuit may include a soft start circuit that generates...
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7573207 |
Driver system and method with multi-function protection for cold-cathode fluorescent lamp and external-electrode fluorescent lamp
System and method for driving a cold-cathode fluorescent lamp. The system includes a control subsystem configured to generate one or more control signals, and a power supply subsystem configured to...
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7569998 |
Striking and open lamp regulation for CCFL controller
An apparatus and method for igniting a lamp during a strike mode of an inverter comprising: sequentially controlling a duty cycle sweep and a frequency sweep of driving signals in the inverter to...
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7564197 |
Discharge tube operation device
A time division signal (S 2 ) for instructing a lit period and an unlit period of a discharge tube ( 23 ) is input to an error amplifier ( 41 ) of an integration circuit ( 40 ). The integration...
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7564196 |
Power supply device, and LED device and electronic device using same
A power supply device includes a step-up circuit configured to supply a driving voltage to a load, a comparison circuit configured to compare an output voltage from the load with a reference...
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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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7564194 |
Method for detecting lamp current and lamp driving circuit using the method for detecting the lamp current
A lamp driving circuit includes: a voltage supply part including a first voltage supply part and a second voltage supply part; a first circuit part including a first terminal, a second terminal and...
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7564192 |
HID dimming method and apparatus
A HID dimming method and apparatus are provided. The method includes generating a dc waveform during a reduced power dimming mode of operation of the HID lamp, the reduced power dimming mode being...
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7564191 |
Inverter having single switching device
An inverter has an inductor, a capacitor, a switching device, a driving circuit and a transformer. A first terminal of the capacitor is connected to the inductor, and the switching device is...
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7560874 |
Electronic ballast with improved inverter startup circuit
An electronic ballast ( 20 ) for powering at least one gas discharge lamp ( 30 ) comprises a self-oscillating half-bridge inverter ( 200′ ) having an inverter startup circuit ( 286,288,290 ) that...
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7560871 |
Ballast with socket-to-fixture voltage limiting
A ballast ( 10 ′) for powering at least one gas discharge lamp ( 32 ) comprises an inverter ( 100 ) and an output circuit ( 200 ′). Output circuit ( 200 ′) includes an output transformer (...
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7560867 |
Starter for a gas discharge light source
A starter for a gas discharge light source is configured to measure an initial resistance of one or more filaments of the gas discharge light source, such as a fluorescent light, each time the gas...
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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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7557515 |
Simplified ballast control circuit
A ballast control circuit for use with a fluorescent lamp in accordance with an embodiment of the present application includes a voltage controlled oscillator operable to provide an operating...
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7554273 |
Protection for external electrode fluorescent lamp system
The present invention provides a driving circuit with protection function for driving a set of external electrode fluorescent lamps (EEFL). The drive circuit includes: a transformer connected to...
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7554272 |
Low noise electroluminescent lamp (EL) driver and method therefor
An EL driver circuit has a full H-bridge circuit. A boost converter is coupled to the full H-bridge circuit. The boost converter is pulse width modulated to generate a gradual increase in voltage...
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7554271 |
Single stage PFC and power converter circuit
A power converter provides constant load power while achieving a high power factor in a single stage configuration with reduced component count and ratings. The power converter takes a rectified...
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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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7550932 |
Control method and device for a power-converting module that drives a light-emitting component
A control device, which controls a power-converting module that is coupled to a light-emitting component, includes a duration detecting unit and a control signal generator. The duration detecting...
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7550930 |
Method and device for lighting an electronic or electromechanical apparatus
The present invention is a lighting device for an electronic or electromechanical apparatus such as a timepiece of the wristwatch type. The invention includes a device displaying time-related or...
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7548028 |
Current-mode resonant inverter circuit
A high conversion efficiency inverter circuit by providing the current-mode resonant type efficient in using a power source. A current-mode resonant inverter circuit comprises a step-up...
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7545369 |
Methods and apparatus to improve efficiency in cold cathode fluorescent light controllers
Methods and apparatus to improve efficiency in cold cathode fluorescent light (CCFL) controllers using a full bridge resonant implementation. The secondary of a transformer drives the CCFL, with...
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7545105 |
Driving circuit for piezoelectric lamps
An improved driving circuit for piezoelectric lamps includes a power switch unit and at least one piezoelectric transformer. The power switch unit is connected to a power source. ON/OFF of the...
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7541753 |
Starter for low-pressure discharge lamps
Disclosed is a starter for AC-fed low-pressure discharge lamps that are operated on a series inductor. The starter comprises a glow fuse, a high-temperature conductor (NTC resistor) that is...
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7541744 |
Electronic ballast for a high-pressure discharge lamp having a current-measuring device
The invention relates to an electronic ballast and to an operating method for high-pressure discharge lamps. During a current measurement, in particular for current regulation, only switching...
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7531966 |
Lamp ballast circuit
In one embodiment, a power switch driving circuit is provided for a fluorescent lamp ballast. The circuit includes a first power switch driven by a first driver. A controller has a first output...
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7531965 |
Discharge centering lamp lighting device
A discharge lamp lighting device can reduce a variation in luminous flux at the time when the polarity of a voltage to be applied to the discharge lamp is inverted, prevent an excessively large...
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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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7525780 |
Liquid crystal television and backlight power supplying circuit
Disclosed is an inverter-circuit power supply circuit capable of redriving an inverter circuit upon temporary blackout without turning on a main power again An inverter-circuit power supply circuit...
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7525261 |
Circuit arrangement for operating a high pressure discharge lamp
A circuit arrangement for operating a high pressure discharge lamp comprises a down converter equipped with an output capacitor and a commutator equipped with lamp connection terminals. The...
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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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