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7629750 |
Lamp driving device and driving method thereof
A lamp driving device includes a switch circuit for supplying a signal; a transformer which boosts a voltage of the signal from the switch circuit and supplies the boosted voltage to at least one...
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7391041 |
Germicidal UV reactor and UV lamp
A germicidal UV reactor for use in fluid purifiers is provided, in which the UV reactor comprises an UV lamp with an UV transparent primary envelope and also an UV transparent secondary envelope...
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7081709 |
Method and apparatus for lighting a discharge lamp
A reliable and efficient circuit for lighting a discharge lamp is described. An inverter accepts a direct current supply voltage and outputs an alternating current lamp voltage to drive the...
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6943395 |
Phase random access memory with high density
A phase random access memory including a plurality of access transistors, each access transistor including a drain region, and a phase-changeable film shared by the plurality of access transistors....
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6784821 |
Synchronizing circuits and methods for parallel path analog-to-digital converters
An Analog-to-Digital (A/D) converter includes signal paths that are responsive to an analog input signal, to generate a multi-bit digital signal. A respective signal path includes a comparator. A...
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6750469 |
Phase change nonvolatile storage device and drive circuit
In a phase-change nonvolatile storage device using a phase-change material as storage cells, which is improved to overcome a basic problem involved in conventional devices of this type and...
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6603275 |
Electronic starter for fluorescent lamps
An electronic starter for fluorescent lamp has a preheating circuit for controlling the preheating of the fluorescent tube and a power switch and locking circuit for cutting off the current to the...
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6169369 |
Low cost, precision electronic starter
Provided is a lighting circuit (10, 100, 160) which includes a line voltage source 12 used to supply a full wave signal 72 to circuit 10. A ballast 14 is connected to the line voltage source 12,...
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6140771 |
Method and device for detecting the rectification effect that occurs in a gas discharge lamp
Method for detecting the rectification effect in at least one gas discharge lamp (10) and electronic ballast for operating at least one gas discharge lamp, which recognises the appearance of the...
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6051930 |
Extended wire connector for starting compact fluorescent lamp system
A compact fluorescent lamp system includes a housing. An external base connector is mounted in the housing. The external base connector receives electrical power from an external source. A ballast...
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6043615 |
Flashing and dimming fluorescent lamps for a gaming device
A method and apparatus for signaling promotional operation of a gaming device using existing fluorescent illumination lamps. An illumination lamp on a gaming device is operated continuously during...
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5998812 |
Amplifying-gate thyristor with an increased hold current
An amplifying-gate thyristor having an increased integrated circuit includes a main thyristor and an amplifying thyristor. The amplifying thyristor is of the gate turnoff-type. The main thyristor...
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5936356 |
Fluorescent lamp flashing circuit and control
A fluorescent lamp flashing circuit is comprised of a fluorescent lamp to which an alternating supply voltage source is connected through a series connected loading reactance device which provides...
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5854542 |
Flashing and diming fluorescent lamps for a gaming device
A method and apparatus for signaling promotional operation of a gaming device using existing fluorescent illumination lamps. An illumination lamp on a gaming device is operated continuously during...
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5838110 |
Apparatus and method for starting and controlling a fluorescent tube
A starter unit for a fluorescent tube includes in parallel across two terminals, first and second main thyristors head-to-tail connected and a zener protection diode. The gate of the first...
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5736817 |
Preheating and starting circuit and method for a fluorescent lamp
The cathodes of a fluorescent lamp are preheating and the medium between the cathodes is ignited into a plasma by heating the cathodes for a predetermined warm-up time period by conducting current...
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5675220 |
Power supply for vehicular neon light
A circuit for use in providing high voltage power to a neon bulb positioned on the vehicle utilizing the vehicle DC battery as the power source. The circuit includes an invertor, a transformer, and...
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5616992 |
Electronic starter circuit for fluorescent lamp
An electronic starter for a fluorescent lamp comprises a power switch, controlled at its gate by a gate-control circuit and an auxiliary supply circuit that gives the necessary logic supply voltage...
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5610477 |
Low breakdown voltage gas discharge device and methods of manufacture and operation
A low breakdown voltage gas discharge device includes an envelope filled with an appropriately selected working substance. Two main electrodes are sealed in a vacuum-tight manner inside the...
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5606224 |
Protection circuit for fluorescent lamps operating at failure mode
A circuit for protecting fluorescent lamps connected to high frequency electronic ballasts has a detecting bridge connected to the fluorescent lamps, an output of the detecting bridge varying...
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5583395 |
Fluorescent device having a fluorescent starter which precisely controls heating time and absolute synchronism of fire point
A new fluorescent device including an electronic fluorescent starter, a phase leading capacitor, a ballast, a bridge rectifier, a fluorescent lamp, a brightness compensation circuit, and a control...
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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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5493336 |
Picture tube screen device having waiting state function
For preserving and, thus, for extending the useful life of a picture tube of a picture tube screen device having a waiting state function. The filament current of the picture tube in the waiting...
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5440204 |
Gas discharge lamp lighting system with phase synchronized gating of d.c. electrode voltage
The present invention relates to a gas discharge lamp lighting system in which a voltage source is provided for supplying an a.c. voltage across the lamp electrodes and, further, a source of stored...
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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...
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5387849 |
Lamp ballast system characterized by a power factor correction of greater than or equal to 90%
A ballast circuit for a fluorescent lamp including a magnetic choke electrically connected between the lamp and a power supply and an electronic starter circuit electrically coupled across said...
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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...
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5150009 |
Glow discharge lamp
An electric circuit for glow discharge lamp which regulates lamp output according to changing environmental conditions includes a power lamp circuit electrically connected between an anode lead-in...
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5132595 |
Filment switch for a lamp ballast
A filament switch for a rapid start fluorescent lamp disconnects or reduces through phase modulation the heating current to a plurality of lamp filaments to save power. The switch uses a trigger in...
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5130605 |
Lighting device for fluorescent lamp
A lighting device for a hot cathode fluorescent lamp used for a back light of a liquid crystal display or the like attempts to prolong the life of a lamp in a lighting device for a low consumption...
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5111115 |
Fluorescent lamp controller
A circuit suitable for the instantaneous starting, continuation, and interruption of current through one or more gasfilled discharge tubes, in particular fluorescent lamps, is described. The...
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5107183 |
Discharging method and small fluorescent lamp using the discharging method
A charging method within a glass tube using a direct current of low voltage is provided in order to obtain a small fluorescent lamp with a light emission of high luminance. Two distinct discharges...
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5059870 |
Electronic solid state starter for fluorescent lamps
An electronic starter for fluorescent lamps is disclosed. A Triac having a trigger electrode and having an anode and a cathode connectable to first and second filaments, respectively, of a...
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5049785 |
Two contact, AC-operated negative glow fluorescent lamp
A negative glow fluorescent lamp includes a light-transmissive envelope enclosing a fill material which emits ultraviolet radiation upon excitation, a phosphor coating on an inner surface of the...
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5023516 |
Discharge lamp operation apparatus
A discharge lamp apparatus is capable of securely detecting the decrease of emission in the terminal stage of the life of a discharge lamp by connecting a voltage detecting circuit to the discharge...
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5021714 |
Circuit for starting and operating fluorescent lamps
A circuit for starting and operating fluorescent lamps from an a-c low frequency power source includes a reactive ballast means connected to ballast the lamps and having a non-linear characteristic...
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5013970 |
Peak voltage reducer circuit for fluorescent lamps
A rapid start fluorescent system which has its starting capacitance connected to a tap on the secondary of the ballast transformer which tap is located at a predetermined number of turns of the...
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5010274 |
Starter circuits for discharge lamps
A starter circuit for a discharge lamp includes a current control circuit which initially has a low impedance so as to produce an initial cathode heating current for the lamp. The current control...
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5006762 |
Negative glow fluorescent lamp having discharge barrier
A negative glow fluorescent lamp includes a light-transmissive envelope enclosing a fill material which emits ultraviolet radiation upon excitation, a phosphor coating on an inner surface of the...
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4988920 |
High-frequency power circuit for gas discharge lamps
A high frequency power circuit for energizing at least one gas discharge lamp with two filaments. The circuit is adapted to be supplied with power from a DC voltage source, and comprises...
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4956581 |
Flyback converter microwave oven power supply
In a microwave oven, a magnetron is powered by way of a self-oscillating flyback converter circuit, which operates at a conversion frequency controllable over a range of frequencies up to about 35...
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4939422 |
Electronic ballast for tungsten lamp tubes
An electronic ballast for tungsten lamp tubes is operable even when one of the tungsten lamp filaments is broken or missing. The transformer negative feedback oscillator which drives the tungsten...
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4906899 |
Fluorescent lamp regulating system
One of the low voltage output windings of a standard ballast circuit is coupled to one filament of a pair of series connected fluorescent lamps by an external current controller. The current...
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4902943 |
Plug-in starting aid
A plug-in starting aid for generating high voltage pulses in the ballast circuit of high intensity discharge lamp comprises interconnected electrical components mounted in a frame of insulating...
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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...
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4853598 |
Fluorescent lamp controlling
An apparatus for energizing a fluorescent lamp having two filament electrodes. The apparatus comprises a rectifier circuit responsive to an AC voltage for providing DC voltage and a transformer...
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4847535 |
Hybrid ballast for multiple discharge lamps
A hybrid ballast apparatus for starting and operating a plurality of series-connected discharge lamps and which provides protection against electric shock. The ballast apparatus includes first and...
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4780649 |
Metal vapor lamp having low starting voltage
A high-intensity discharge (HID) metal vapor lamp and starting apparatus includes a metal vapor lamp having an outer envelope containing a gas filled arc tube, the fill gas including xenon, the arc...
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4749909 |
Compact igniter for discharge lamps
A ballast-inverter circuit for a discharge lamp with preheatable electrodes. The lamp is connected to the supply voltage input terminals via a ballast impedance. A triac provides a preheat current...
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4704563 |
Fluorescent lamp operating circuit
A fluorescent lamp operating circuit includes a high frequency electronic ballast circuit for providing a controlled output to a fluorescent lamp load. A control signal is detected from the power...
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