|
Match
|
Document |
Document Title |
|
|
7183714 |
Ballast with relamping circuitry
An apparatus for detecting the reconnection of a lamp filament to an electronic ballast driving a fluorescent lamp. A control circuit controls an inverter circuit to providing power to a filament...
|
|
|
6114809 |
Planar fluorescent lamp with starter and heater circuit
A planar fluorescent lamp having a resistive trace and optically transmissive cover electrodes is described. In one embodiment, the lamp includes an insulative lamp body with the transparent cover...
|
|
|
5907222 |
High efficiency backlighting system for rear illumination of electronic display devices
A fluorescent cavity backlight system that provides a high efficiency light source suitable for rear illumination of transmissive electronic display devices. The inventive fluorescent cavity...
|
|
|
5726534 |
Preheat current control circuit based upon the number of lamps detected
A feedback control system of ballast which has function to detect the number of lamp and is applied to an integrated circuit to control the ballast for a fluorescent lamp etc, and provides the...
|
|
|
5604409 |
Electronic lighting controller
An electronic circuit for converting AC or DC input current to pulsating DC, then to high frequency AC. The DC input is used for aircraft applications, or in emergency situations. The circuit...
|
|
|
5517082 |
Traveling wave tube heating coil power supply with varying frequency AC current limiting means
A power supply for supplying the heating coils of a tube (WR), in particular a traveling-wave tube, wherein a transformer (Tr) and an inverter (S1, S2) are provided in the heating circuit of the...
|
|
|
5498930 |
Method of dimensioning and operating a low pressure discharge lamp
In a method of dimensioning and operating by A.C. or D.C. at a predetermined external heater power a low pressure discharge lamp, particularly a fluorescent lamp having two electrodes between which...
|
|
|
5463278 |
Method and apparatus for random frequency of tube filament current
Radiated emission is reduced in a vacuum fluorescent tube having a pulsed filament current in a variable frequency range above audible frequencies. A driver circuit produces a fixed width pulse of...
|
|
|
5451841 |
Soft start of lamp filament
A method is provided in which a relatively cold lamp filament may be turned on for a brief period of time, then turned off, then turned on again, then off again, and this process repeated for...
|
|
|
5436527 |
Circuit for operating a fluorescent lamp
In a circuit for operating a fluorescent lamp with controllable luminance, with the fluorescent lamp comprising a discharge path and heater coils, the discharge path is connected through a...
|
|
|
5367223 |
Fluoresent lamp current level controller
A method and apparatus for automatically adjusting the light intensity output of a fluorescent lamp of a document scanner. The fluorescent lamp current level control apparatus comprises preheating...
|
|
|
5347197 |
Display device having a display tube including a cold cathode and a current mirror drive circuit for the cold cathode
A display device having a display tube including a cold cathode, for example a PN emitter (PNE), has the terminals of the PN emitter (PNE) coupled between first terminals of a first (CR1) and a...
|
|
|
5256939 |
Magnetic electronic fluorescent lamp ballast
A magnetic-type ballast powers an F40/T12 four foot fluorescent lamp from a regular 120 Volt/60 Hz power line by way of a main inductor. A power factor correction capacitor is connected in series...
|
|
|
5247228 |
Fluorescent lamp ballast adaptor
An adaptor circuit used to enable stable, flicker-free operation of T8-type fluorescent lamps in a lighting fixture which already has a standard two-lamp, series-sequence, 40 watt, rapid-start type...
|
|
|
5243258 |
Fluorescent lamp electrode disconnect arrangement
A fluorescent lamp system including a ballast with primary and secondary windings and a switch for each of the plurality of electrodes of the lamp system. Each switch is operable in response to the...
|
|
|
5066929 |
Circuit for producing four indications on a bicolor light emitting diode having two leads
A circuit for producing four indications on a bicolor light emitting diode (LED) includes a ring oscillator, with two inputs controlling inverters of opposite phase. By enabling or disabling these...
|
|
|
5063328 |
Energy saving circuit for discharge tubes
Circuits for increasing the efficiency of fluorescent tubes by openings one side of all of the filament circuits of the tubes in response to flow of plasma current. The circuits may be employed in...
|
|
|
5032765 |
Operating system for fluorescent lamp array
A lighting arrangement comprises: a) an array of plural pairs of series-connected fluorescent lamps, with each lamp pair: i) adapted to be powered from 30 kHz/240 Volt by way of a high-Q...
|
|
|
4954749 |
Fluorescent lamp electrode disconnect method and arrangement for practicing the method
A fluorescent lamp system including a relay whose coil is connected across the secondary of the transformer of the system and whose contacts interrupt the connection of the electrodes of the lamp...
|
|
|
4947086 |
System for lighting fluorescent lamps
A system for lighting fluorescent lamps, includes a plurality of fluorescent lamps, a transformer for generating filament voltage and a starting voltage for the fluorescent lamps, a switching...
|
|
|
4914354 |
Reactor-type ballast circuit
An improved, more energy efficient reactor-type ballasting circuit for fluorescent lamps includes an inductive ballasting coil for directly applying an AC line voltage to the cathodes of a lamp...
|
|
|
4900986 |
Ballast circuit for starting fluorescent lamps
An improved ballast circuit for fluorescent lamps includes an electronic bilateral triggering device and a capacitor connected in series combination across the secondary winding output terminals of...
|
|
|
4896078 |
Distributed ballasting system for sun tanning apparatus
A ballasting system for powering an array of multiple parallel-oriented fluorescent lamps in a sun tanning apparatus comprises and an electronic frequency converter adapted to convert ordinary 60...
|
|
|
4862035 |
Fluorescent lamp unit having plural separate tubes and particular arrangement of circuit elements
A fluorescent lamp unit comprising a self-contained assembly intended for use in replacement for a conventional incandescent filament lamp comprises two U-shaped fluorescent tubes (54, 55), each...
|
|
|
4847536 |
Power reducer for fluorescent lamps
An attachment is provided for connection in fluorescent lamp circuits for reducing power consumption. The attachment is particularly designed for use with fluorescent lamp circuits having an...
|
|
|
4740873 |
Energy saving "U" shaped fluorescent lamp
A "U" shaped fluorescent lamp includes a housing extending the legs of the lamp, the housing containing means to reduce current flow in the lamp, thereby saving energy.
|
|
|
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...
|
|
|
4663566 |
Fluorescent tube ignitor
The preferred embodiment provides such a fluorescent tube ignitor having a plurality of auxiliary electrodes provided in the periphery of the tube wall of each fluorescent tube, while the...
|
|
|
4613792 |
Symmetrical load power reduction device for lighting fixtures
A device to reduce power consumption in a rapid-start fluorescent lighting fixture having one or more lamps and a conventional ballast. The device includes a step-up isolation transformer, a...
|
|
|
4525649 |
Drive scheme for a plurality of flourescent lamps
The above and other objects, advantages and capabilities are achieved in one aspect of this invention by a drive scheme for a plurality, that is, for N, where N-2, flourescent lamps. The drive...
|
|
|
4523795 |
Discharge lamp operating apparatus and method
A process for operating a discharge lamp with an arc drop of not less than about 75% of a given service voltage includes the steps of series connecting a ballast and discharge lamp, coupling the...
|
|
|
RE31758 |
High efficiency push-pull inverters
High efficiency push-pull inverters minimize undesirable energy losses usually resulting from simultaneous conduction and imperfect switching of the transistor switching means. In each of the...
|
|
|
4425530 |
Time delay lamp ballast circuit
A multiple fluorescent lamp ballast circuit of the rapid start type in which heating current is supplied to the lamp cathodes. A time delay switch is connected in series with a starting capacitor...
|
|
|
4396866 |
Lamp filament drive scheme providing for control of filament voltages by use of lamp current in solid state ballasts
An output configuration for an electronic ballast system includes means for effecting independent selection of both pre- and post-ignition lamp filament voltages. The primary of a filament voltage...
|
|
|
4339690 |
Energy saving fluorescent lighting system
Energy-saving circuitry for a rapid-start fluorescent lighting system includes a reactance-modifying capacitor coupled in series with first and second fluorescent lamps and includes a filament...
|
|
|
RE30687 |
Energy saving device for a standard fluorescent lamp system
There is provided in combination with a rapid-start series-sequence type ballast for two low-pressure mercury discharge lamps, apparatus for reducing the power consumption of both lamps. The...
|
|
|
4211958 |
Phantom fluorescent lamp with safety switch
A safe "phantom" lamp structure for replacing a fluorescent lamp in a two-lamp series circuit connected fluorescent fixture which permits the remaining lamp of the two-lamp fixture to operate. The...
|
|
|
4209729 |
On chip vacuum fluorescent display drive
An improved arrangement for providing cathode heating current in a visual display wherein pulses of heating current are sequentially applied at brief intervals, the magnitude of the current and the...
|
|
|
4207497 |
Ballast structure for central high frequency dimming apparatus
An illumination control system for gas discharge lamps which can be dimmed is provided in which a central inverter produces sinusoidal output voltage at about 23 kHz. The amplitude of the inverter...
|
|
|
4207498 |
System for energizing and dimming gas discharge lamps
An illumination control system for gas discharge lamps which can be dimmed is provided in which a central inverter produces an output voltage at a high frequency which can be about 23 kHz. The...
|
|
|
4185231 |
High efficiency ballast system for gaseous discharge lamps
Electrical lamp ballast system for starting and operating fluorescent lamps with improved efficiency and safety. System includes high leakage reactance autotransformer having primary and secondary...
|
|
|
4145638 |
Discharge lamp lighting system using series connected starters
The present discharge lamp system comprises two or more serially connected discharge lamps connected across a pair of power input supply terminals through a ballast circuit and two or more serially...
|
|
|
4135115 |
Wattage reducing device for fluorescent fixtures
A device which is designed to save electrical energy expended by a regular rapid start fluorescent lighting fixture having a plurality of lamps, or tubes, and a conventional ballast. The device...
|
|
|
4075476 |
Sinusoidal wave oscillator ballast circuit
A sinusoidal wave oscillator ballast circuit includes a tuned oscillator coupled to a DC rectifier means coupled by a power factor correction circuit to an AC potential source. The oscillator is...
|
|
|
4042852 |
Fluorescent lamps with high frequency power supply with inductive coupling and SCR starter
A high frequency power supply with inductive coupling and a SCR starter to light two fluorescent lamps is described. It supplies high frequency square waves to the fluorescent lamp for improved...
|
|
|
4010399 |
Switching circuit for a fluorescent lamp with heated filaments
A ballast for a rapid start fluorescent lamp with heated filaments has a secondary winding supplying lamp current, tertiary windings for supplying heater current to the filaments, and solid state...
|
|
|
4008414 |
Circuit for powering fluorescent lamps
A circuit employing an oscillator having a feedback loop for supplying operating current at a frequency in the range 20-25 kilohertz to a pair of fluorescent lamps connected in series. The heater...
|
|
|
3971967 |
Fluorescent lamp installation having separate filament transformers and remotely located ballast
A fluorescent lamp installation for very high intensity illumination uses standard rapid start filament type lamps with standard ballast remote from the lamp pairs to reduce cooling requirements....
|
|
|
3954316 |
Electrical apparatus and method for reducing power consumption of a fluorescent lamp system
An attachment is provided for inclusion in a two-lamp rapid-start type fluorescent lamp and encapsulated ballast transformer combination to reduce the electrical power consumption thereof,...
|
|
|
3924155 |
Ballast unit for gas discharge lamps
A ballast unit system for various types of gas discharge lamps, in particular for fluorescent tubes, mercury and sodium vapor lamps, comprising a ballast choke. The lamp circuit is arranged in...
|