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7307385 |
Boost controller capable of step-up ratio control
A charge pump circuit boosts a voltage of a battery so as to generate a drive voltage for an LED. A constant current circuit generates a constant current to feed through the LED. A monitoring...
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7307614 |
Light emitting diode driver circuit
Describe is a device for a multiplexing, output current-sensed, boost converter circuit which may be used as an LED driver. A boost converter LED driver circuit using a single set of passive...
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7304439 |
Phase-controlled dimmable electronic ballasts for fluorescent lamps with very wide dimming range
In order to achieving wide dimming range for compact and tubular fluorescent lamps, two novel control approaches are proposed. (i) Novel techniques for suppressing oscillatory effects in the Triac...
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7304438 |
Method and apparatus for preventing instabilities in radio-frequency plasma processing
A method and apparatus for controlling a power supply to prevent instabilities due to dynamic loads in RF plasma processing systems, operating at frequencies of from 1 MHz and up, uses a...
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7304440 |
Electron-emitting apparatus
An electron emitting apparatus includes a lower electrode, an emitter section made of a dielectric material, a plurality of upper electrodes having micro through holes, and a collector electrode...
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7301291 |
Power controller having current limited RMS regulated output
A power controller converts a line voltage to an RMS load voltage for a lamp, and includes a switch and a microcontroller that operates the switch to define the RMS load voltage. The...
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7301784 |
Lighting control unit for vehicle lighting fixture
In a process where the energy accumulated in the transformer while a transistor is turned ON is emitted to an output circuit and an LED is illuminated with the emitted energy, a voltage generated...
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7301288 |
LED buck regulator control IC
A high speed buck control IC for constant LED current regulation. A continuous mode hysteretically controlled buck regulator monitors the load current using an accurate on-chip band-gap voltage...
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7301289 |
Discharge lamp lighting control device
The present discharge lamp lighting device is capable of rapidly breaking or restoring a lamp current or of rapidly reducing or restoring the lamp current. A discharge lamp lighting device,...
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7298093 |
Method and device for driving CCFL circuit
A driving device for a CCFL circuit comprising at least one CCFL is provided. The driving device comprising at least one heating device controlling the temperature of the at least one CCFL, a power...
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7298095 |
Discharge lamp ballast apparatus
A primary side current value to be shunted from a DC power source ( 1 ) to the primary side of a DC power circuit ( 2 ) is detected by a primary side current detection resistor ( 5 ), and an output...
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7298096 |
Circuit and method for sensing open-circuit lamp of a backlight unit and display device with circuit for sensing open-circuit lamp of backlight unit
A circuit for sensing an open-circuit lamp is provided. The circuit includes a reference voltage output unit, a voltage sensor, and a comparator. The reference voltage output unit provides a...
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7298098 |
Intellectual lamp unit able to be installed on a conventional lamp socket controlled by a wall switch
An intellectual lamp unit able to be installed on a conventional lamp socket controlled by a wall switch includes a bypass connected in parallel with a wall switch and provided with a resistance or...
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7298088 |
Arc tube and low-pressure mercury lamp
This invention aims at providing a low-pressure mercury lamp having an improved luminous efficiency while maintaining the compactness and long life of the arc tube. This lamp comprises an arc tube...
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7295176 |
LED driver with constant current offset unit
A light emitting diode (LED) driver to drive an LED, including a current adjusting unit to adjust magnitude of a current flowing on the LED by supplying power from a power supply device to the LED...
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7294977 |
Lamp dimming system and methods
A system and related methods for operating a lamp. The system and method provide for ON/OFF control such that the light source illuminates in predefined steps and is reduced in predefined steps....
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7294976 |
Split power supply subsystem with isolated voltage supplies to satisfy a predetermined power limit
A power subsystem including a mechanism for satisfying a predetermined power limit in a computer system. The power subsystem may include a split power supply and a voltage regulator. The split...
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7294974 |
Fixed operating frequency inverter for cold cathode fluorescent lamp having strike frequency adjusted by voltage to current phase relationship
A method of driving a lamp that uses a DC to AC inverter that is connected to a primary winding of a transformer is disclosed. The inverter frequency is variable, and in one embodiment, may be...
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7294973 |
Discharge tube lighting apparatus, light source apparatus, and display apparatus
A discharge tube lighting apparatus is used to drive a plurality of discharge tubes. The apparatus includes a balance coil having a winding input end and a plurality of winding output ends to which...
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7294975 |
Method for controlling an inverter under altering voltage
A method for controlling an inverter under altering voltage aims to change the electric conductive interval of the electric conductive cycle of the inverter corresponding to alteration of an input...
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7294978 |
Efficient lighting
A method for efficient lighting includes supplying power to a light source to control the intensity of light emitted from the light source according to an intensity waveform. The amplitude of the...
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7294968 |
Signal transmisson system and vehicular lamp
There is provided a vehicular lamp that can be miniaturized by reducing signal lines connected to a vehicle main body. The vehicular lamp that is used for a vehicle includes a light source unit,...
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7294979 |
Light source module with temperature sensor
A light source module includes a lamp assembly, at least one temperature sensor for monitoring a temperature of the lamp assembly, and a processor coupled to the temperature sensor and the lamp...
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7291984 |
Method of reducing RMS load voltage in a lamp using pulse width modulation
A method of converting a line voltage to an RMS load voltage in a lamp includes modulating a load voltage with a pulse width modulation circuit that is entirely within the lamp and provides an RMS...
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7291988 |
Electronic high intensity discharge lamp driver
A high intensity discharge (HID) driver for a HID lamp which can be used as a HID ballast is provided. The HID driver at least includes an input processor connected to an input power for...
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7291987 |
Power supply system for flat panel display devices
A power supply system for powering backlight lamps in a flat panel display with reduced dimensions and increased power efficiency. The power supply system includes a converter circuit for...
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7291989 |
Lighting control circuit for vehicle lighting equipment
This disclosure relates to protecting a switching regulator by sensing immediately a change in an input voltage when the input voltage of the switching regulator is changed suddenly. When an input...
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7291993 |
Method for driving a fluorescent lamp and an inverter circuit for performing such a method
A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an...
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7291990 |
Discharge lamp lighting circuit
A discharge lamp lighting circuit 1 is provided with a DC-AC conversion circuit 3 having a plurality of switching elements 5H, 5L and a series resonance circuit ( 8, 9, 7 p ), and control means...
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7291992 |
Load failure protection circuit and discharge lamp driving apparatus
The present invention provides a load failure protection circuit and a discharge lamp driving apparatus, which can exactly detect a failure even if the failure arises in any of a plurality of...
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7288902 |
Color variations in a dimmable lighting device with stable color temperature light sources
A method and system allow a lighting device having light sources with multiple color temperatures to vary a color temperature of the lighting device in response to changing dimming levels. The...
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7288900 |
Illumination system having at least two light sources, and a method for operating such an illumination system
An illumination system has at least two light sources of which at least one light source includes an LED, and a driver device designed to operate at least the one LED with a DC signal; a sensor...
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7288899 |
Light source, projector, and method of driving arc tube
Aspects of the invention can relate to a light source that includes a light source lamp and an arc-tube drive unit. The light source lamp can include an arc tube that emits light between a pair of...
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7288897 |
Circuit arrangement for operating at least one high pressure discharge lamp
A circuit arrangement for operating at least one high-pressure discharge lamp having four switches in a full bridge arrangement, a first and a second switch forming the first half-bridge arm, and a...
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7286123 |
LED driver circuit having temperature compensation
A LED driver circuit is provided for controlling the brightness of a LED. A control circuit is used for generating a LED current in accordance with a resistor. The control circuit is further...
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7285925 |
Backlight module control circuit of multi-lamp display device
A backlight module control circuit of a multi-lamp display device includes a control unit, multiple lamp driving circuits and a fault detection unit. The control unit includes multiple signal...
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7285923 |
Display apparatus and driving pulse control method thereof
An apparatus and method is disclosed for controlling a display driving pulse to drive an LED display. In one embodiment, an RGB signal is received and a period during which all the LEDs are...
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7285921 |
Electric current balancing device
An electric current balancing device includes an inverting circuit having a driving unit and one or more transformers coupled together for outputting an electric current to a load device, a...
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7282870 |
Driving apparatus for CCFL
The invention relates to a driving apparatus for a CCFL capable of easily providing a high output required to start the lamp. In the apparatus, an oscillator provides a reference signal in...
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7282871 |
Backlight inverter for inductively detecting current
A backlight inverter using electromagnetic induction and full-wave rectification at a second side of a main transformer includes a drive unit for generating a first voltage and a main transformer...
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7282868 |
Inverter circuit for discharge lamps for multi-lamp lighting and surface light source system
An inverter circuit for discharge lamps for multi-lamp lighting in which the value of a negative resistance characteristic of a fluorescent lamp is controlled, and an excessively set reactance is...
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7280375 |
Circuit arrangement for operating at least one light-emitting diode
A circuit arrangement is for operating at least one light-emitting diode LED in an electrical circuit at a service voltage greater than the forward voltage of the at least one light-emitting diode....
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7279958 |
Synthesized resonation for an EL driver circuit
A driver circuit for an electroluminescent (EL) lamp that consumes less power and reduces electromagnetic interference (EMI). Electrical charge is stored during a discharge cycle of an AC signal...
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7279853 |
Fluorescent lamp dimmer control
A dimmer fixture has a ballast board 10 , a main board 40 and switch 70 . The ballast board and main board have no inductors so the fixture may be used for fluorescent and incandescent lamps....
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7279844 |
Electronic ballast
The invention relates to a ballast for low-pressure discharge lamps, comprising a controllable inverter circuit for the generation of a high-frequency supply voltage for a discharge lamp ( 1 ), a...
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7276855 |
Auxilary lighting circuit for high intensity discharge system
The embodiment disclosed herein relates to a lighting system that includes an auxiliary lighting circuit for use with an electronic HID ballast. The lighting system comprises a power supply...
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7276862 |
Stabilizer circuit for high-voltage discharge lamp
A stabilizer circuit for a high-voltage discharge lamp is provided. The stabilizer comprises an electromagnetic interference (EMI) filter; a rectifying unit; a power factor correction (PFC)...
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7276861 |
System and method for driving LED
A system drives one or plurality of LEDs regulating their brightness by controlling LEDs average current or voltage. The system includes a switching power converter and an integrated digital...
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7275835 |
Projector for changing driving frequency for driving light source lamp within allowable frequency range
A projector according to the present invention comprises a lamp driving control circuit for driving an ultra-high pressure mercury lamp at a driving frequency which is changed within an allowable...
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7274148 |
Lamp having fixed forward phase switching power supply with time-based triggering
A lamp contains a lamp voltage conversion circuit that is entirely within a base for converting a line voltage at a lamp terminal to an RMS load voltage at a light emitting element. The voltage...
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