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8143793 |
Device and method for periodic diode actuation
An energy efficient illumination device is provided in which energy consumption is reduced by using a pulse generating circuit which provides power to LEDs in short pulses, and in which the circuit...
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8089213 |
LED fluorescent lamp
Provided is a light-emitting diode (LED) fluorescent lamp using as light sources a plurality of LEDs, which are eco-friendly and can contribute to power conservation. The LED fluorescent lamp...
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8067926 |
Power supply for a load control device
A power supply for a load control device generates a DC voltage and provides an asymmetrical output current, while drawing a substantially symmetrical input current. The power supply comprises a...
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8013536 |
Inverter circuit
From the individual small areas of a conductor pattern arranged on the back side of a circuit board, there are individually extended leader patterns, which are midway led by through holes to the...
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7982404 |
Method and apparatus and system for adjusting power to HID lamp to control level of light output and conserve energy (ballast multi-tap power output)
One aspect of the present invention is a non-electronic method of controlling the power provided to the lamp through use of multiple secondary taps off the secondary side of the HID ballast. This...
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7960922 |
High efficiency low power capacitor charged DC driver
A high efficiency low power DC driver apparatus is presented for powering a light source, with a capacitive divider circuit receiving an AC input and providing a divided AC output, a rectifier...
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7952299 |
Control circuit and method for self-exciting capacitor charging circuit
A first voltage comparator makes a comparison between a first detection voltage that occurs at one terminal of a first resistor and a predetermined first threshold voltage. A second voltage...
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7952294 |
Apparatus, system and method for cascaded power conversion
An apparatus method and system are provided for power conversion, to supply power to a nonlinear load such as a plurality of light emitting diodes. An exemplary apparatus comprises a first power...
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7919928 |
Boost LED driver not using output capacitor and blocking diode
An LED driver is disclosed that boosts an input voltage to drive any number of LEDs in series. The driver includes a switch-mode current regulator that supplies regulated current pulses to the...
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7791285 |
High efficiency AC LED driver circuit
In an AC drive circuit for LEDs, a current limiting capacitor connects to an AC source, a first circuit portion, including a first rectifying diode and a first power capacitor, connects between the...
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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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7453214 |
Lamp-operating unit and low-pressure mercury discharge lamp
The present invention aims to provide an inrush current limiting resistor for suppressing inrush current, and to avoid an excessive current flowing through the inrush current limiting resistor even...
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7279849 |
Apparatus for driving backlight of liquid crystal display
This invention relates to a backlight driving apparatus of a liquid crystal display device, and more particularly to a backlight driving apparatus of a liquid crystal display device that includes:...
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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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7129650 |
Lighting apparatus for high intensity discharge lamp
A lighting apparatus of high intensity discharge lamp comprises a DC power source, a series connection of a first and a second transistors; a series connection of a first and a second capacitors...
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7049756 |
Capacitive load driving circuit, capacitive load driving method, and apparatus using the same
A capacitive load driving circuit (1) for charging and discharging a capacitive load (11) is provided with a voltage divider (5) for dividing a power supply voltage (VH) into a plurality of...
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7042167 |
Back light device for liquid crystal displays
Disclosed herein is a back light device for LCDs. The back light device includes an inverter to supply an alternating current or a pulse, a plurality of fluorescent lamps to radiate visible light,...
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7009346 |
Driving an EL panel without DC bias
An inverter is coupled to an EL lamp by a high pass filter including a series capacitor and a shunt resistor. The resistor is coupled in parallel with the EL lamp. The high pass filter has a time...
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6960891 |
Direct-type back light device
The object of this invention is to provide a direct-type back light device, capable of maintaining uniform luminance, and reducing manufacturing costs and power consumption, in addition to being...
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6856101 |
Method and apparatus for switching of parallel capacitors in an HID bi-level dimming system using voltage suppression
Switching of parallel capacitors in an HID bi-level lighting control system is accomplished through use of transient voltage suppression across an electronic relay for discharge of residual charge...
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6597128 |
Remote discharge lamp ignition circuitry
A starter circuit is provided for starting an HID lamp. The circuit de-couples the high voltage starting pulse from the input lines (ballast output lines) so that the starter can function properly...
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6566822 |
Electronic circuits for detecting filament breakage in gas discharge lamps
Disconnection device for an electronic operating device for gas discharge lamps. The DC component is evaluated at a coupling capacitor (C5) specifically via a filament. Disconnection is performed...
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6515433 |
Gas discharge fluorescent device
Sputtering of the cathodes of a cold cathode fluorescent lamp is reduced or eliminated by removing electrodes altogether from the sealed envelope containing the gaseous medium. Electric field is...
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6414447 |
Discharge lamp lighting device and illuminating device
A combination-type high frequency inverter connects an isolation leakage transformer, a smoothing condenser, a resonance condenser, a first field-effect transistor and a second field-effect...
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6337543 |
High power cold cathode gas discharge lamp using sub-electrode structures
A high power cold cathode gas discharge system employs two electrode structures, where each structure includes a plurality of sub-electrodes connected in parallel to a driver so that the current...
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6335596 |
Control device of a flash type movable decorating lamp
A control device of a flash type movable decorating lamp comprises a high voltage converting circuit, an actuating circuit, a high voltage storage capacitor, a flash displaying circuit and other...
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6326738 |
Two wire light for electronic displays
An apparatus for illuminating an electronic display such as an LCD. A single hot wire is connected to multiple capacitors each dedicated to a cold cathode fluorescent tube, and multiple tubes are...
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6232724 |
Light emitting diode array
An LED array composed of a plurality of LEDs is disposed on either side of a signal interconnection board, while metal plates are disposed on the other side of the signal interconnection board as...
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6147459 |
Voltage-controlled ballast for gas-discharge lamps
An electronic, externally controlled ballast has a control oscillator which feeds a fluorescent lamp via an invertor bridge and a resonant circuit. To keep the voltage constant, there are derived...
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6111364 |
Method and device to inhibit the flash photography of a vehicle
A device and method that inhibits the ability of photographic equipment from obtaining a recognizable picture upon its recording media, of areas of a vehicle equipped with this invention. The...
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6031340 |
Device and method for capacitive bi-level switching of high intensity discharge lighting
A zero current crossing capacitive switching scheme for controlling the switching of a capacitor into and out of an HID lead ballast circuit at a time when a current through the capacitor is at or...
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5973447 |
Gridless ion source for the vacuum processing of materials
Plasma beam apparatus and method for the purpose of vacuum processing temperature sensitive materials at high discharge power and high processing rates. A gridless, closed or non-closed...
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5896015 |
Method and circuit for forming pulses centered about zero crossings of a sinusoid
A circuit that forms a square wave pulse train signal wherein each pulse is centered about a zero crossing of a reference sinusoid. A first capacitor is coupled to be charged and discharged at...
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5892327 |
Circuit arrangement for operating a discharge lamp
A circuit arrangement according to the invention for operating a discharge lamp (I) comprises a DC/AC converter (II) provided with a series circuit with a first and a second switching element, (1,...
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5834902 |
Discharge lamp igniting and operating curcuit having interference signal suppression from 9 KHz to 100 MHz
A circuit arrangement for igniting and operating a discharge lamp is provided with input terminals for connecting a supply source, and a ground terminal, differential-mode and common-mode filters...
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5736819 |
Parallel-tuned electronic ballast with special output voltage waveform
Power to a self-oscillating inverter ballast is supplied from a DC voltage source through an inductor means having two separate windings on a common magnetic core--with one winding being positioned...
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5731667 |
Hybrid sequence start ballast for an instant start discharge lamp
In accordance with the present invention, a hybrid sequence start circuit is provided for operating a plurality of instant start lamps. The circuit utilizes two coils, a primary and a secondary,...
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5701060 |
On-chip high frequency damping for laser diode driver chips
A laser diode driver chip is disclosed which has a circuit to substantially reduce a ringing on a laser diode driving current generated by the laser diode driver chip. This invention identifies...
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5644194 |
Circuit for controlling an indicator light to turn off slowly
A circuit for turning off an indicator light operates in two phases that provide a first rapid discharge phase and a second slow discharge phase. This sequence dims the light in a visual...
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5602446 |
Fast repetition rate (FRR) flasher
A fast repetition rate (FRR) flasher suitable for high flash photolysis including kinetic chemical and biological analysis. The flasher includes a power supply, a discharge capacitor operably...
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5594305 |
Power supply for use with switched anode field emission display including energy recovery apparatus
A switching power supply 38 for use in a switched anode, field emission flat panel display includes energy recovery modules 48R, 48G and 48B for recovering energy from each anode electrode 50R, 50G...
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5585700 |
Electronic ballast
An electronic ballast for one or more F32T8 or F25T8 or F17T8 fluorescent lamps has a new design tool for efficient transfer of power to the lamp or the lamps. The design tool is constructed from...
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5563473 |
Electronic ballast for operating lamps in parallel
An electronic ballast for powering at least two rapid start, parallel connected fluorescent lamps. Associated with each lamp is a serially connected choke and capacitor combination. A train of...
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5543690 |
High voltage ignition circuit for a discharge lamp
The invention relates to a circuit arrangement for operating a discharge lamp. According to the invention the series connection of a PTC thermistor V1 with a bi-directionally acting breakdown...
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5534753 |
High-pressure discharge lamp igniting circuit in which the voltage-raising network includes inductors
The invention relates to a circuit arrangement for igniting a high-pressure discharge lamp (L), provided with input terminals (C,D) for connection to a commutating supply source with a square-wave...
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5489823 |
Electronic ballast for gas discharge lamp
A first half-bridge inverter is powered from an unfiltered full-wave-rectified ordinary 60 Hz electric utility power line voltage. This first inverter provides at a first inverter output, across...
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5471118 |
Electronic ballast with power-factor-correcting pre-converter
In a power-line-operated current-fed parallel-tuned electronic ballast, power-factor-correction and harmonics-reduction are attained by placing a high-frequency inductor as well as a high-frequeny...
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5446348 |
Apparatus for providing ignition to a gas turbine engine and method of short circuit detection
A solid state, bipolar, ignition exciter for gas turbine engines is described for delivering high energy pulses to one or more igniter plugs. A storage capacitor is charged with typically 12 to 20...
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5444334 |
System for starting a high intensity discharge lamp
A ballast circuit arrangement with hot restrike capabilities includes an input transformer having a primary winding receptive of line power and a secondary winding over which an output voltage is...
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5434478 |
Electronic ballast for transilluminators and crosslinkers
A low cost multipurpose electronic ballast for ultraviolet transilluminators and crosslinkers for starting and operating four or more ultraviolet lamps simultaneously. The electronic ballast is...
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