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7492361 |
Image display apparatus using thin-film transistors
There are provided a display apparatus and a display method, with which compressed image data that is to be decompressed can be transmitted to the display apparatus in an environment in which a...
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7407617 |
Free radical polymerization method having reduced premature termination, apparatus for performing the method, and product formed thereby
A method of polymerizing by a free radical polymerization mechanism, product formed thereby, and apparatus for performing this method, are disclosed. The composition to be polymerized by the free...
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7378800 |
Starting apparatus for a high-pressure discharge lamp and high-pressure discharge lamp having a starting apparatus and operating method for a high-pressure discharge lamp
A starting apparatus for a high-pressure discharge lamp provided with an auxiliary starting electrode, has a series resonant circuit for the purpose of generating the starting voltage for the...
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7102296 |
Screw-in transformer
An apparatus for providing convenient transforming of electrical energy from a first voltage level to a second voltage level, includes a housing having an end wherein the end includes a conductive...
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RE38547 |
Frequency-modulated converter with a series-parallel resonance
A frequency-modulated converter with a series-parallel resonance, particularly for driving any ohmic or inductive load, including gas discharge tubes, wherein a commutating voltage switch in the...
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6583586 |
Brightness- regulating voltage-transforming circuit for high-pressure discharge lamp
A brightness-regulating voltage-transforming circuit includes a pulse-width modulator (PWM); a transformer connected at a secondary side to a high-pressure discharge lamp; a voltage-transforming...
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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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6356033 |
Light source using dielectric barrier discharge lamp, and power supply
A dielectric-barrier discharge lamp light source with a dielectric-barrier discharge lamp, the light source including a discharge plasma space filled with a discharge gas in which excimer molecules...
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5589739 |
Hybrid ballast for high pressure discharge lamp
A circuit for operating a discharge lamp includes input terminals for connection to a supply voltage source and a first apparatus coupled to the input terminals for generating a low-frequency...
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5568018 |
Fluorescent light ballast circuit
An improved fluorescent light ballast circuit extends the on/off life of a florescent lamp within a lighting circuit having a pair of series connected fluorescent lamps. The ballast circuit...
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5500576 |
Low height ballast for fluorescent lamps
An electronic ballast has a high voltage portion and a low voltage portion. The high voltage portion includes a converter, having a variable frequency boost circuit, and a half-bridge, driven...
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5394064 |
Electronic ballast circuit for fluorescent lamps
An electronic ballast circuit for multiple fluorescent lamps. Control is achieved by varying the voltage and the frequency of operation of an inverter utilized to drive the fluorescent lamps. A...
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5159245 |
Track lighting system for 277 volt power line
In a track lighting system for a 277 volt power line, proper voltage for powering 120 volt incandescent lamps is obtained by way of an integral electronic transformer-less voltage conditioner....
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5130609 |
Illuminating device incorporating gas-filled chambers
A light source having two potential terminals, a transformer coil having a primary incorporating two windings and a secondary transistor, the first potential terminal being connected to the first...
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5115347 |
Electronically power-factor-corrected ballast
A fluorescent lamp is connected in parallel with the tank capacitor of a resonant L-C circuit series-excited by a 30 kHz voltage from a self-oscillating inverter. The inverter's DC supply voltage...
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5072170 |
Reverse phase angle control of A.C. power loads
AC power loads such as from transformers, motors, high in-rush heaters, air conditioners, etc., are controlled by the use of bipolar transistors, FET transistors, gate turn-off SCRs and IGBT to...
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5008596 |
Fluorescent lamp high frequency operating circuit
To provide enhanced starting voltages for fluorescent lamps operating, for xample, from 110 V power networks through a rectifier, and in which a high-frequency oscillatory circuit is used which...
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4868460 |
Transformer dimmer circuit
This invention is a circuit for controlling the power received by a load. The operation of this circuit is based on variations of voltage amplitude rather than phase as is the case with other...
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RE33057 |
High frequency supply system for gas discharge lamps and electronic ballast therefor
The invention is both a system for supplying high frequency alternating current to gas discharge lamps, such as fluuorescent lamps, and the like and a unit that can be placed in or adjacent to a...
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4862039 |
Line regulated ballast circuit
The present invention relates to an improved line regulated ballast circuit for use in controlling varied lighting applications such as, for example, neon signs and fluorescent tubes. The inventive...
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4859914 |
High frequency energy saving ballast
A circuit is disclosed for energizing electrical devices such as fluorescent lamps and other gas discharge luminescent devices. The circuit provides energizing signals for gaseous discharge tubes...
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4818917 |
Fluorescent lighting ballast with electronic assist
A ballasting circuit for fluorescent lamps includes a series-connected current limiting ballast element and an electronic assist circuit. The ballast element has a high voltage side connectable to...
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4806830 |
Device and process for lighting a fluorescent discharge lamp
There is disclosed a device and process for starting up a fluorescent discharge lamp in which a high-frequency pulse is generated having narrow voltage peaks above the voltage required to start...
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4749914 |
Circuit system for igniting and operating a high-pressure discharge lamp, particularly a sodium vapor lamp
A circuit system for igniting and lighting a high-pressure discharge lamp, particularly a sodium vapor lamp, comprising a pulse generator for generating signals of at least 1 kHz frequency being a...
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4749913 |
Operating circuit for a direct current discharge lamp
A power supply for a metal halide discharge lamp includes a circuit for applying a high voltage starting pulse to the arc tube of the lamp to initiate the discharge, a glow transition current to...
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4716343 |
Constant illumination, remotely dimmable electronic ballast
A solid-state ballast for discharge lamps includes a device for sensing the instantaneous current flowing within the load to produce illumination. A signal representing this load current is...
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4700112 |
Fluorescent lamp lighting circuit
A flourescent lamp lighting circuit comprising a rectifying circuit and an oscillatory circuit. The rectifying circuit comprises a rectifier bridge, capacitors and coils to rectify the local...
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4700111 |
High frequency ballast circuit
A high frequency ballast circuit powered by a dc input voltage source for starting and operating a gas discharge lamp load, comprising: a means for providing drive signals, each the drive signal...
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4689524 |
Fluorescent lamp ballast
An electronic fluorescent lamp ballast having at least an energy storing component, a controlling component which has two states, and two socket elements which enables the filaments of the...
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4682082 |
Gas discharge lamp energization circuit
An electronic energization circuit is provided to illuminate a gas discharge lamp that includes a transformer with a substantially rectangular hysteresis loop. A secondary winding on the...
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4613796 |
Single transistor oscillator ballast circuit
A single power transistor oscillator circuit includes a single transistor oscillator coupled by an inductive means including an inductive coil and transformer to a DC potential development means...
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4540917 |
Pulse network for fluorescent lamp dimming
A pulse network is connected to the inductive ballast of a fluorescent lamp dimmer and includes a discharge resistor in parallel with the pulse network capacitor. The resistor size is such that it...
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4523131 |
Dimmable electronic gas discharge lamp ballast
A two-wire electronic dimming ballast arrangement for one or more gas discharge lamps is disclosed which includes an inverter driven by a variable pulse width electric power and a control system...
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4523128 |
Remote control of dimmable electronic gas discharge lamp ballasts
A remotely controlled dimming solid state ballast system for gas discharge lamps adapted to respond to external control signals is disclosed which includes the ballast itself along with integral...
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4503362 |
Frequency stabilized, gain controlled ballast system
A frequency stabilized automatic gain controlled ballast system (10) which is coupled to a power source (12) in order to operate at least one of a pair of gas discharge tubes (40 and 40'). Each of...
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4500813 |
Lighting system
A lighting system (11) utilizes a high intensity quartz halogen bulb (12) surrounded by a spaced dome (18) to permit substantially spherical radiation of luminous energy for general area...
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4495446 |
Lighting unit with improved control sequence
An energy efficient lighting unit is described designed for functional similarity to the incandescent light used in the home. The lighting unit utilizes a metal vapor arc lamp as the main source of...
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4472661 |
High voltage, low power transformer for efficiently firing a gas discharge luminous display
A power system comprising a high voltage, low power transformer that utilizes self-resonance parameters and pulse control techniques for efficiently firing a gas discharge lamp of the type commonly...
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4441053 |
Switched mode electrode ballast
An electronic ballast circuit for operating high intensity gas discharge tubes such as high pressure sodium, high pressure mercury and metal halide tubes, as well as ordinary fluorescent tubes. In...
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4394583 |
Electric fence energizers
An electric fence energizer which comprises a capacitor connected across a power supply to an output transformer. An SCR is provided between the capacitor and the primary stage of the transformer...
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4386395 |
Power supply for electrostatic apparatus
A power supply for electrostatic apparatus provides a high voltage output. The high voltage output is provided by the half wave rectification and filtering of a pulse signal from a secondary...
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4339695 |
High pressure sodium lamp ballast circuit
A ballast circuit for limiting the kilovolt-ampere rating of a ballast required to operate a high pressure sodium lamp during starting, hot restart and lamp out conditions. The ballast circuit...
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4339692 |
Power supply for HID lamp
A power supply for a high intensity discharge lamp is provided wherein the secondary windings of a pair of lamp strike pulse transformers are connected in series with the HID lamp directly across...
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4330736 |
Compensated current feedback oscillator ballast for fluorescent lamps and the like
A power source for operating gas discharge lamps and other loads at high frequency, typically utilizing a dc source or a rectified ac source to produce a high frequency output. An inverter with...
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4320325 |
Circuit for starting and ballasting arc discharge lamps
A circuit for starting and ballasting a compact high-intensity arc discharge lamp. A filament connected in series with the arc lamp provides illumination during arc start-up and functions as a...
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4276496 |
Gas discharge lamp employing a pulse generator with a double stage amplification circuit
A solid state ballast circuit for a discharge lamp includes a transistor oscillator with a current amplifier connected to a transformer one secondary winding of which is connected to the lamp and...
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4251752 |
Solid state electronic ballast system for fluorescent lamps
An electronic solid state system is provided for starting and operating one or more fluorescent lamps, and which supplies power to the lamps at a relatively high frequency, and at a relatively high...
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4220896 |
High frequency lighting inverter with constant power ballast
A lighting inverter for operating an electrical discharge lamp from a direct current power source. The inverter includes a resonant feedback inverter which converts the output of the d.c. power...
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4187448 |
Discharge lamp lighting device
Discharge lamps are connected to a commerical alternating current power supply through an impedance for blocking high frequency signals and an impedance compensating for the negative resistance of...
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4167689 |
Solid state lamp ballast
A lamp ballast connectable with a d.c. source comprises a regulating device having a voltage coil and a load coil. The voltage coil is connected in a circuit in parallel with the series-connected...
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