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7202612 |
Discharge lamp lighting apparatus
A discharge lamp lighting apparatus has a problem that a microcomputer within the apparatus falls down into malfunction due to noises generated in an inside thereof. With such the structure of the...
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7202609 |
Noise reduction in a power converter
A power converter includes a control device ( 28 ) for a switching power converter ( 10 ), a switching power converter and a method of controlling a switch in a power converter for reducing audible...
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7202608 |
Switched constant current driving and control circuit
The driving and control device according to the present invention provides a desired switched current to a load including a string of one or more electronic devices, and comprises one or more...
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7202611 |
Discharge lamp lighting device
A device for lighting a discharge lamp has a drive circuit to feed alternating power the discharge lamp, and a control circuit. The control circuit controls the drive circuit by a drive pulse to...
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7199530 |
Digital ballast
A ballast in which the drive current frequency is controlled by a voltage-controlled oscillator (VCO) that is capable of precise output frequency control. The VCO frequency is controlled by a...
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7199528 |
Control circuit for maintaining constant power in power factor corrected electronic ballasts and power supplies
The control circuit for maintaining constant power in power factor corrected electronic ballasts and power supplies maintains constant power in a variable load. This constant power control circuit...
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7196479 |
Electronic ballast having a protective circuit for a switching transistor of a converter
The invention relates to an electronic ballast for lamps having a converter, in which a switching transistor is protected against transient disturbances by a detection circuit C 1 , C 2 , R 1 , R 2...
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7196481 |
Method and drive circuit for controlling LEDs
A method and control circuit are disclosed for controlling light emitting diodes (“LEDs”). Based upon the LED's current versus intensity characteristic and temperature versus intensity...
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7196482 |
PWM controller with automatic low battery power reduction circuit and lighting device incorporating the controller
A controller for controlling a voltage applied to a load from a power source includes a square wave producing circuit for connection in the circuit with the battery and the lamp. The square wave...
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7193373 |
Electronic ballast having a converter which can continue to operate in the event of lamp failure
The invention relates to an electronic ballast, in which an internal converter S 1 , S 2 , C 1 continues to operate in the event of a lamp failure. An auxiliary power supply from control circuits...
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7193375 |
Electronic ballast having a pump circuit for a discharge lamp having preheatable electrodes
The invention relates to an electronic ballast for discharge lamps LA 1 , LA 2 having preheatable electrodes which has a pump circuit D 5 /D 7 , D 6 /D 8 for improving the power factor. In this...
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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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7190127 |
Shutdown circuit
The invention relates to an electronic ballast for operating a discharge lamp LA, in which a pump circuit D 6 , C 8 , C 9 , L 1 charges an intermediate circuit capacitor C 6 from the AC voltage...
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7190125 |
Programmable wallbox dimmer
A programmable wallbox dimmer is disclosed. Upon entering a programming mode, the dimmer presents a main menu from which the user may select one or more features to program. The user may scroll...
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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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7183721 |
Ballast with circuit for detecting and eliminating an arc condition
An apparatus for powering a lamp connected to a ballast circuit. A DC bus provides a DC voltage signal to an inverter. A control circuit selectively energizes the inverter to generate an AC signal...
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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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7183692 |
Method for controlling power supply in a buffered modulation mode
A method for controlling power supply in a buffered modulation mode is to control an inverter to perform energy transformation so that the inverter and a load in the rear end can function in a...
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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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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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7180252 |
Geometric panel lighting apparatus and methods
Methods and apparatus for generating at least one variable color lighting effect over at least a two-dimensional observation area. In various examples, at least first radiation having a first...
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7180251 |
Electronic power circuit for gas discharge lamps
An input dc-voltage, usually obtained from an AC-mains voltage through a pre-connected rectifier and Power Factor Corrector, is converted by a series connection of two power transistors to an...
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7176639 |
Electronic ballast and controlling method thereof
An improved electronic ballast for providing an electrical energy to a fluorescent lamp circuit is provided. It includes a pre-heating inductor; a first resonant circuit connected to the...
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7176636 |
Circuit arrangement for operating a lamp
In an electronic ballast circuit equipped with lamp presence detection means that generate a current flowing through one of the lamp electrodes the detection means are periodically switched off....
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7177131 |
Control circuit of power supply with selectable current-limiting modes
The present invention discloses a control circuit of power supply with selectable current-limiting modes, wherein the control circuit which maintains the power-output circuit of the power supply...
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7176637 |
Rare gas fluorescent lamp apparatus
When a control unit is operated by a lighting control signal, when a reference voltage source unit outputs the reference voltage, voltage inputted into an error amplifier from a time constant...
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7173584 |
Transistor circuit, display panel and electronic apparatus
A transistor circuit is provided including a driving transistor where conductance between the source and the drain is controlled in response to a supplied voltage, and a compensating transistor...
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7173380 |
Push-pull driver with null-short feature
A push-pull driver for powering fluorescent lamps in a backlight system includes a transformer with three primary windings to realize the advantages of both a push-pull switching topology and a...
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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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7173383 |
Lighting apparatus having a plurality of independently controlled sources of different colors of light
A lighting apparatus includes a first source of monochromatic light, a second source of white light, and a third source of polychromatic light. The light from the three sources combine to produce a...
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7170231 |
Lamp that sets desired RMS load voltage with variable pulse width modulation
A lamp includes a voltage controller that converts a line voltage to a desired RMS load voltage. The voltage controller is entirely within a lamp base and uses pulse width modulation to define the...
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7170234 |
Light emitting apparatus generating white light by mixing of light of a plurality of oscillation wavelengths
A current of the same amount or in a constant ratio is applied to each of a combination of a blue light emitting diode having a small wavelength variation and a green light emitting diode having a...
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7170237 |
Device for operation of a high pressure discharge lamp
To positionally stabilize the arc spot in a super-high pressure discharge lamp which is filled with at least 0.20 mg/mm 3 of mercury and to prevent the formation of so-called flicker, in an...
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7166964 |
Lamp containing pulse width modulated voltage conversion circuit
A lamp includes a voltage conversion circuit entirely within a lamp base. The voltage conversion circuit includes a pulse width modulator for modulating a lamp load voltage and provides a load...
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7164241 |
Method and apparatus for driving a gas discharge lamp
A method for driving a gas discharge lamp ( 1 ) is described, wherein electric first DC power is provided at a relatively high voltage and a relatively low current. Said first power is converted...
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7164238 |
Energy savings device and method for a resistive and/or an inductive load and/or a capacitive load
An energy savings device for an inductive, a resistive or a capacitive load, such as a fluorescent light fixture having a magnetic ballast or an electronic ballast, which is powered by an AC...
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7164237 |
Circuit arrangement for operating discharge lamps
A DC-AC converter in a half bridge configuration is used for operation with high pressure discharge lamps as well as low pressure discharge lamps. The converter consists in two switches (T 1 -T 2 )...
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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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7161308 |
High-voltage discharge lamp operating device
A high-voltage discharge lamp operating device capable of reducing the size and the weight of a DC-DC converter circuit, and accordingly of the operating device without generating any magnetic...
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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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7161312 |
Distributed fluorescent light control system
Systems and methods are provided for operating a fluorescent tube having a pair of filaments. The system comprises a transformer, an AC signal generator and a coupling device. The AC signal...
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7157864 |
Vehicular lamp, cold cathode fluorescent lamp lighting apparatus, and cold cathode fluorescent lamp lighting method
There is provided a vehicular lamp that can prevent excess current from flowing between an anode and a cathode at the lighting-up start to prevent a damage and life shortening of a cold cathode...
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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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7154644 |
Image reader
An image reader of the stepping image reading type, by time division using a fluorescent lamp using a dielectric barrier discharge, in which for each divided image uniform lamp emission is always...
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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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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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