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7268501 |
Multi-lamp driving circuit
A multi-lamp driving circuit includes a transformer, a first lamp, a second lamp, a current/voltage converting circuit and a voltage/current converting circuit. Transformer includes a secondary...
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7265504 |
High efficiency power supply for LED lighting applications
A power supply for plural loads coupled in parallel comprises a voltage regulator, a plurality of current regulators, and an error control circuit. The voltage regulator provides a common output...
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7265502 |
Dimming apparatus of light emitting unit
The present invention discloses a dimming apparatus of a light emitting unit that uses a sensor to detect an external signal such as sound, shadow, temperature or digital image for changing the...
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7265498 |
Dimmer control system and controlling method thereof
A system for controlling illumination of a fluorescent lamp includes a silicon controlled rectifier (SCR) control circuit receiving a first signal of a power source and generating an adjustment...
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7265499 |
Current-mode direct-drive inverter
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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7259523 |
Circuit arrangement
In a bride circuit comprising a lamp choke that might partially saturate during the ignition of the lamp, at least one of the switches is switched off when the amount of charge displaced through it...
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7259525 |
High efficiency switching LED driver
The present invention provides a LED driver for control the brightness of the LED. An inductor and a switch are connected in serial with the LED for control the current of the LED. A control...
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7259522 |
Lighting method, lighting apparatus and components used therefor
A current to light emitting devices when an application voltage is at or higher than the lower limit voltage for lighting determined by the arrangement of the light emitting devices, and an...
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7253567 |
Low-visual noise, jitterized pulse width modulation brightness control circuit
A low visual noise, jitterized pulse width modulation brightness control circuit is provided. The circuit uses a brightness control signal generating unit to receive a brightness adjusting signal...
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7253564 |
Lamp current balancing device
A lamp current balancing device comprises an electronic power switch, a transformer, a current transformer and a pulse width modulation (PWM) IC; the transformer having a primary side connected to...
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7253569 |
Open lamp detection in an EEFL backlight system
A method according to one embodiment may include supplying power to plurality of External Electrode Fluorescent Lamps (EEFLs). The method of this embodiment may also include generating signals...
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7247996 |
Projector
The present invention is directed to decrease temperature rise in a power supply circuit in a standby mode by using existing signals and circuits while suppressing cost. In a power supply circuit...
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7245090 |
Switching LED driver with temperature compensation to program LED current
The present invention provides a LED driver for control the brightness of the LED. An energy-transferred element and a switch are connected in series with the LED for controlling the current of the...
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7245089 |
Switching LED driver
The present invention provides a LED driver for controlling the brightness of the LED. An inductor and a switch are connected in series with the LED for controlling the current of the LED. A diode...
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7245088 |
Power control circuit for controlling rated power supplied to a load
A power control circuit includes a power switch unit operable so as to enable and disable supply of an input voltage from an external power source to an LC circuit, a voltage detecting unit for...
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7245086 |
Lamp operating circuit and operating method for a lamp having active current measurement
The invention relates to a circuit and to a method for operating a lamp. In this case, a reactance for the purpose of detecting the lamp voltage, a zero point detection device for the purpose of...
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7245087 |
Power conversion device
A power conversion device has a series circuit of a main switching element and a sub-switching element connected to both ends of a DC power supply, an insulating transformer, and control circuits....
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7242147 |
Current sharing scheme for multiple CCF lamp operation
A ring balancer comprising a plurality of balancing transformers facilitates current sharing in a multi-lamp backlight system. The balancing transformers have respective primary windings separately...
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7242149 |
Lamp driving circuit with floating power supply driver
A lamp driving circuit with a floating power supply driver includes a microcomputing unit, a floating power supply driver, and a driving unit. The microcomputing unit and the floating power supply...
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7242153 |
Pulse width modulation inverter circuit and control method thereof
A pulse width modulation inverter circuit is provided. The circuit includes a power switch driver, a power switch, a transformer unit, a feedback detector unit, and a voltage control oscillator....
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7239091 |
Discharge lamp lighting apparatus for lighting multiple discharge lamps
A discharge lamp lighting apparatus is provided for lighting a plurality of discharge lamps including one reference lamp and at least one controllable lamp. First variable inductance element and...
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7239094 |
Electronic ballast with adaptive lamp preheat and ignition
An electronic ballast includes a microcontroller with software to provide an adaptive lamp preheat and ignition operation. The microcontroller commands a test frequency from the inverter and...
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7235933 |
Reversible dimmer device of gas discharge lamps and the control method for light adjusting thereof
A reversible dimmer device of gas discharge lamp and a control method for light adjusting thereof are proposed, in which a power switch on the wall or on an appliance is used to control actions of...
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7233115 |
LED-based lighting network power control methods and apparatus
Multiple lighting apparatus coupled together to form a lighting network, in which operating power is efficiently provided throughout the network based on a distributed DC voltage or a distributed...
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7233113 |
Power supply system for liquid crystal monitors
A power supply system for liquid crystal monitors includes a first DC/AC converter (FBS, HBS) operating at predetermined frequency and duty-cycles and being fed by a second DC/DC converter (FC)...
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7233116 |
Method for stabilizing brightness of a cold cathode fluorescent lamp and related apparatus
A method for stabilizing brightness of a cold cathode fluorescent lamp includes receiving currents from two ends of the cold cathode fluorescent lamp and providing a current for the cold cathode...
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7230387 |
Electroluminescent device including a programmable pattern generator
An electroluminescent (EL) device achieves a significant increase in the lifetime of EL light sources by using a driver with a controlled duration of intervals between rectangular pulses and...
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7230391 |
Multi-phase input dimming ballast with flyback converter 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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7227315 |
Discharge lamp drive apparatus and liquid crystal display apparatus
A discharge lamp drive apparatus includes: an inverter circuit; a transformer; a plurality of discharge lamp connection terminals; a plurality of ballast capacitors; a plurality of voltage...
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7221108 |
Apparatus of driving lamp and liquid crystal display device using the same
An apparatus of driving a lamp includes a first inverter board having a first inverter for supplying a first high-voltage alternating-current waveform via a first high-voltage line to a first...
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7221101 |
Lamp driving device
A lamp driving device for driving a lamp. A feedback circuit includes a voltage falling unit and a rectification circuit. The voltage falling unit provides a low voltage signal in response to a...
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7221111 |
Switching power supply device and method of controlling the switching device
According to one embodiment, the switching power supply device comprises a DC-DC converter, an alternating current driver circuit, a smoothing capacitor and control circuitry. The control circuitry...
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7218061 |
Circuit arrangement for producing a control signal for the purpose of dimming at least one lamp
A circuit arrangement for producing a control signal (U s ) for the purpose of dimming at least one lamp, including a device ( 10 ) for modifying the phase gating angle corresponding to a dimming...
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7218066 |
Driver for a gas discharge lamp
Driver ( 150 ) for a gas discharge lamp ( 9 ) comprises: an arrangement of two MOSFET switches ( 61, 62 ) connected in series between two input terminals ( 51 a, 52 b ); an inductor ( 73 )...
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7218059 |
Discharge-lamp control device
A discharge-lamp control device for lighting a discharge-lamp includes two electrodes, first and second driving units to supply power to the discharge-lamp through the electrodes, respectively....
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7218538 |
Power source device
A power source device is provided including a boosting circuit for stepping-up an input voltage to a desired output voltage, a starter circuit for starting the boosting circuit in a starting period...
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7211964 |
Lamp including phase-control power controller with digital RMS load voltage regulation
A phase-control power controller that converts a line voltage to an RMS load voltage includes a phase-control circuit with a potentiometer and a capacitor whose resistance and capacitance determine...
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7211966 |
Fluorescent ballast controller IC
A ballast control integrated circuit for driving at least one gas discharge lamp comprising a first oscillator circuit for producing a first oscillating signal; a driver circuit for driving first...
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7208887 |
Ballast having multiple circuit failure protection and method for ballast circuit protection
A ballast for a gas discharge lamp comprising a first circuit portion for providing power to a lighting load and a second circuit portion for processing data exchanged with a communication link,...
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7208883 |
Current detection circuit, and power supply apparatus, power supply system and electronic apparatus using the current detection circuit
In the current detection circuit that detects the output currents of a switching power supply circuit, an improved current detection circuit makes it possible to detect the output current...
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7208881 |
LED strobe light
An LED light that includes an LED light source. A thermoelectric device is configured to maintain the LED light source within a predetermined temperature range. A controller provides a pulse signal...
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7208884 |
Discharge lamp lighting circuit with an open protection circuit
A discharge lamp lighting circuit includes an open protection circuit. The discharge lamp lighting circuit includes an open protection circuit and an over-voltage detecting circuit. The open...
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7208886 |
Apparatus for driving cold cathode fluorescent lamps
A starting voltage adjustment circuit ( 70 ), which can vary starting voltages to CCFLs ( 40 ) according to variations in the temperature of the immediate environment, is employed in an apparatus...
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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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7202614 |
Electronic ballast for a fluorescent task lamp
An electronic ballast circuit for a handheld fluorescent task lamp, comprising a self-starting electronic driver circuit operated by a power supply and operable to start and run at least first and...
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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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