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5583396 |
Optical device with metal halide discharge lamp having enhanced starting property
A metal halide lamp is employed, as a light source, in an optical device such as, for example, an illuminator or an image display. The optical device includes a discharge tube filled with mercury,...
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5571439 |
Magnetron variable power supply with moding prevention
A power supply for a magnetron varies a power output level and prevents moding of the magnetron. To provide a variable power output, a microprocessor senses an anode current and voltage of the...
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5530319 |
Power supply circuit for a discharge lamp and use of and method of operating the same
For triggering a discharge lamp powered by a d.c. source and having electrodes disposed in the lamp bulb, a power supply circuit is proposed having a triggering device where, after the start of...
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5493180 |
Lamp protective, electronic ballast
A lamp protective, electronic ballast includes a lamp voltage detector having a capacitor and resistor series connected across a discharge lamp. The junction of the resistor and capacitor is...
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5489825 |
Transformer
An electrical arrangement is disclosed comprising a circuit to supply current to a discharge lamp. The circuit comprises a lower voltage source of alternating current in the form of a square wave...
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5479075 |
Fluorescent lamp starter circuit
A fluorescent lamp starter circuit includes a relay which forms a first circuit loop to detect the input voltage and to switch the relay from the normally-closed position to the normally-open...
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5477109 |
Discharge lamp fast preheat circuit independent of type of ballast
A circuit arrangement for preheating electrodes of a discharge lamp connected in series with a ballast by means of a supply voltage of alternating polarity. The circuit arrangement is provided with...
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5444333 |
Electronic ballast circuit for a fluorescent light
An energy efficient and cost effective electronic ballast circuit which lights a fluorescent tube but which avoids excessive voltages or pulsing of the tube. The starter circuit preheats the...
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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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5436529 |
Control and protection circuit for electronic ballast
A series-resonant ballast for powering at least one gas discharge lamp (16) having heatable filaments (12,15) includes: DC voltage input terminals (B+,B-); an oscillating resonant converter...
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5394065 |
Circuit for supplying current to a discharge tube
An electrical arrangement is disclosed comprising a circuit to supply current to a discharge lamp. The circuit comprises a lower voltage source of alternating current in the form of a square wave...
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5389857 |
Magnetic ballast for fluorescent lamps
A low component count and lightweight ballast usable with fluorescent lamp loads of widely different wattage has first and second inductors and first and second capacitors connected in a bridge...
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5384518 |
Power source device
A power source device includes a voltage converting means to input side of which a DC voltage source is connected and to output side of which a capacitance element and a load circuit are connected,...
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5338110 |
Circuit, having multiple series resonant paths, for lighting a blinking fluorescent lamp without adversely affecting lamp life
A circuit for lighting a fluorescent lamp. The present invention takes into account the fastidious characteristics of the fluorescent lamp, and during the momentary lighting of the fluorescent...
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5250877 |
Method and apparatus for driving a gas discharge lamp
A regulated current source is used to drive the cathodes of a hot cathode gas discharge lamp. In one embodiment, the regulated current source is time shared between the lamp cathodes and the lamp arc.
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5185559 |
Supply circuit for P-N junction cathode
An electron emission device is provided in which a drive current for driving an electron emission element is maintained at a constant level. The device comprises a transistor having its base...
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5179326 |
Electronic ballast with separate inverter for cathode heating
A high-frequency electronic ballast for fluorescent lamps has a first inverter for controllably providing heating power to the lamp cathodes and a second inverter for controllably providing main...
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5175471 |
Circuit arrangement for the operation of a fluorescent lamp
A circuit arrangement for the operation of a fluorescent lamp which is connectable to an alternating-current power supply, for example, the elctrical power supply on board an aircraft, including a...
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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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5130606 |
Method and apparatus for increasing the cathode efficiency in a cathode ray tube
A CRT display system is described wherein a measure of the beam current generated within the CRT is derived and the voltage across the cathode heater modified as a function of this measure. In this...
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5122712 |
Method and circuit to operate a low-pressure discharge lamp, particularly compact fluorescent lamp
To decrease the losses in the starting circuit for a compact fluorescent p, a positive temperature coefficient (PTC) resistor (KL) is connected in a resonance circuit of the lamp and also connected...
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5057746 |
Current sensing relay
A three pole relay is shown which operates in response to the flow of normal operating current across fluorescent lamps to energize a coil which actuates a relay to open switches disposed in all of...
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5047689 |
Gas discharge tube, indirectly heated cathode for use therein and drive circuit therefor
A gas discharge tube comprises an indirectly heated cathode structure including a hot cathode into which a heater is incorporated. During discharging, the heater is supplied with a discharge...
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5027033 |
High-efficiency fluorescent lamp operating circuit
To prevent long-time current flow through a positive temperature coeffici resistor (KL) included in the heater circuit of one or more fluorescent lamps (LP, LP1, LP2), a relay is connected in...
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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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4990830 |
Current sensing relay
A three pole relay is shown which operates in response to the flow of normal operating current across fluorescent lamps to energizes a coil which actuates a relay to open switches disposed in all...
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4982137 |
Apparatus for igniting a discharge lamp including circuitry for preventing cataphoresis phenomenon generation
An apparatus is provided for driving a discharge lamp, the discharge lamp having first and second electrodes, each of the first and second electrodes having first and second terminals. The...
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4949015 |
Bridge inverter ballast for fluorescent lamp
A full-bridge inverter ballast for a fluorescent lamp comprises two pairs of switching transistors and is conditionally operable to self-oscillate in either of two modes: a first mode wherein one...
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4939330 |
Method and arrangement for controlling output power of a plurality of magnetrons connected to a common power source
A method for controlling magnetrons with regard to their microwave power in those cases where a multiple of magnetrons are present. The method includes connecting two or more magnetrons in parallel...
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4866347 |
Compact fluorescent lamp circuit
A starting and operating circuit for a super compact fluorescent lamp includes ballast and discharge circuits for applying current to the filaments of the lamp and then apply starting pulses which...
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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...
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4816986 |
Power control device for the magnetron of microwave oven
A power control device for a microwave cooking oven includes a regulator of the anode voltage of the magnetron and a heater voltage source. The anode voltage regulator includes a d.c. voltage...
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4810934 |
Electron emission device
An electron emission device for attracting electrons emitted from an electron emission element to an anode, includes a current detector for detecting a flow-in current to said electron emission...
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4754200 |
Systems and methods for ion source control in ion implanters
A method for operating an ion source having a filament-cathode and an anode. The method includes supplying direct current electrical power between the anode and the filament-cathode characterized...
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4746841 |
Fluorescent lamp operating device
A fluorescent lamp operating device having a power supply, a circuit for converting the output power from the power supply into a high-frequency power, a lighting circuit connected to a secondary...
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4737689 |
Thermal delay light arrangement
The arrangement of this invention includes circuitry for sequentially lighting a series of lamps, followed by extinguishing them in unison; said circuitry including, in association with each lamp,...
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4736138 |
Apparatus for limiting surge currents in dc-illuminated incandescent lamp
Surge currents which may arise in dc-illuminated incandescent lamp can be effectively limited by an apparatus comprising a low resistance (first resistance); another resistance (second resistance);...
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4734924 |
X-ray generator using tetrode tubes as switching elements
The anode and cathode of an X-ray tube are connected to a high-voltage power source respectively, through corresponding tetrode tubes, and the center metal electrode of the X-ray tube is grounded....
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4727292 |
High voltage power supply fault isolation system
An electronics circuit for improving the fault isolation of failures between an electron tube radio frequency (RF) amplifier and its high voltage power supply is disclosed. High voltage power...
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4724363 |
Current control circuit for high voltage applications
A current control circuit for high voltage applications includes series-connected high and low voltage sources through which the current to be regulated flows. The low voltage source is a capacitor...
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4709187 |
Lamp with lead wire thermal switch
A rapid-start fluorescent lamp has a tubular envelope with a phosphor-coated inner wall, a pair of spaced electrodes and a pair of electrical leads sealed into the ends of the envelope with one...
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4661745 |
Rapid-start fluorescent lamp power reducer
A rapid-start fluorescent lamp system includes a ballast circuit, rapid-start fluorescent lamps and power reducing means for controlling the application of energy to the lamps. The power-reducing...
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4659966 |
Rapid-start fluorescent lamp integrated circuit breaker structure and manufacture
A rapid-start fluorescent lamp has a tubular envelope with a phosphor-coated inner wall surface, a pair of spaced electrodes and a pair of electrical leads sealed into each end of the envelope with...
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4651058 |
Apparatus and method of operation for an electron beam source
Apparatus and method for substantially equalizing the potential drop along a line cathode used in an electron beam source adapted for use in a flat display device. The apparatus and method ensure...
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4647819 |
Metal vapor lamp starting and operating apparatus
A low wattage metal vapor discharge lamp starting and operating apparatus includes an inductive ballast connected to one of a pair of terminals connectable to a low voltage source, a metal vapor...
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4642524 |
Inverse shadowing in electroluminescent displays
An apparatus for essentially eliminating variations in luminescence (i.e., inverse shadowing) in an electroluminescent (EL) display is disclosed. The pixels of an EL display are driven to their...
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4628226 |
Method and arrangement for preventing cathode damage when switching on field emission electron guns
The invention is directed to a method of preventing cathode damage when switching on an electron gun having a field emission cathode assembly including a cathode, a first electrode and a ground...
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4623929 |
Flash tube simmer circuitry for a film video player electronic strobe light
A film video player includes an electronic strobe light operable for repetitively firing a flash tube, to flash illuminate a solid state image sensor via a high-intensity light pulse projected onto...
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