Matches 1 - 50 out of 209 1 2 3 4 5 >


Match Document Document Title
9018847 Thyristor dimming circuit with lossless discharging circuit and method thereof  
Thyristor dimming circuits and methods are disclosed herein. In one embodiment, a thyristor dimming circuit can include: (i) a thyristor and a rectifier bridge configured to receive a sinusoidal...
8907579 Luminaire  
When an operator operates an operation tool of a dimming operation terminal device in order to set the brightness of a lighting load to desired brightness, an energization electric signal, for...
8896207 Fluorescent light fixture assembly with LED lighting element and converter modules  
The present invention is directed to a fluorescent light fixture assembly including a ballast and a novel lighting element that includes an array of LEDs and at least one converter module that...
8847493 Electrical module and method for illuminating a high intensity discharge (HID) lamp on a vehicle  
The invention is directed to an electrical module and a method for illuminating a HID lamp on a vehicle, and in particular an off-road recreational vehicle. The electrical module and the method...
8786204 DC/DC converter and driving apparatus having the same  
There are provided a DC/DC converter and a driving apparatus having the same. The DC/DC converter includes a DC/DC converter part converting an input power into a predetermined DC power by...
8710760 Power supply apparatus for light emitting diode  
A power supply apparatus for LED is provided. The power supply apparatus for LED includes a transformer, a first output unit, and a second output unit. The transformer includes a primary winding,...
8664878 Ballast with an arc quenching circuit  
An arc detection circuit that detects an occurrence of arcing between ballast and a lamp is provided. A transformer has a primary side connected between the ballast and the lamp to receive lamp...
8643295 Luminaire  
When an operator operates an operation tool of a dimming operation terminal device in order to set the brightness of a lighting load to desired brightness, an energization electric signal, for...
8587209 LED drivers and control methods  
A method of operating an LED driver including a power converter to generate an output current for powering an LED and to provide active power factor correction is disclosed. The power converter is...
8587207 Electronic ballast  
An electronic ballast for a light emitting load is provided, and includes a transformer module, a resonance module, a high-frequency push-pull inverter and a driving controller module. The...
8581505 Primary-side based control of secondary-side current for a transformer  
A power control system includes a transformer and a controller regulates a current on a secondary-side of the transformer based on a primary-side signal value. In at least one embodiment, the...
8575862 Power supply for airfield lighting  
Disclosed herein is a power supply suitable for use with an airfield lighting device. In accordance with an example embodiment, there is disclosed herein, a rectifier that converts a signal from...
8358088 Interface circuit for transmission of digital signals  
The transmission branch of an interface circuit has a transformer. On the input side there are applied to the transformer, for example from a controller, high-frequency impulses. The output side...
8288954 Primary-side based control of secondary-side current for a transformer  
A power control system includes a transformer and a controller regulates a current on a secondary-side of the transformer based on a primary-side signal value. In at least one embodiment, the...
8274236 Power supply having an auxiliary power stage for sustaining sufficient post ignition current in a DC lamp  
The current invention provides a power supply that includes an igniter that generates an ignition voltage for igniting a DC lamp; an auxiliary power stage that outputs an auxiliary voltage for...
8253350 Open loop LED driving circuit  
The present invention discloses an open loop LED driving circuit, having a turn-on period and a turn-off period, the circuit comprising: a power stage, used to store a magnetic energy supplied...
8102122 System and apparatus for cathodoluminescent lighting  
A cathodoluminescent lighting system has a light emitting device having an envelope with a transparent face, a cathode for emitting electrons, an anode with a phosphor layer and a conductor layer....
8080944 Ignition device  
An ignition circuit arrangement and method for a discharge lamp, with which there is associated a supply circuit for providing an ac supply voltage to the lamp, includes an ignition transformer...
8076860 Power converter and power conversion method with reduced power consumption  
A power converter and power conversion method converts an input AC signal to a voltage usable by a load while reducing power consumption, thereby making the converter and method suitable for a...
7696699 Lamp base for a high-pressure discharge lamp and corresponding high-pressure discharge lamp  
A lamp base (2) for a high-pressure discharge lamp comprises an ignition transformer (1000), which is placed in the interior (214) of the lamp base (2) and which serves to ignite the gas discharge...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...

Matches 1 - 50 out of 209 1 2 3 4 5 >