Matches 151 - 200 out of 510 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
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...
4500812 Electronic ballast circuit  
An electronic ballast circuit for a lower pressure lamp wherein a voltage divider network coupled by a capacitor and directly coupled to an AC source is shunted by a series connected transistor...
4469981 Circuit for the operating of gas discharge lamps  
In a circuit for the operating of gas discharge lamps in which a starting circuit (2, 17) having a starter transformer (17) and a source of auxiliary voltage which can be disconnected after...
4469988 Electronic ballast having emitter coupled transistors and bias circuit between secondary winding and the emitters  
An electronic ballast for energizing fluorescent lamps comprising a converter including a rectifier and a filter for converting an alternating source voltage into a direct current voltage, a...
4463285 DC Ballasting means for fluorescent lamps  
A fluorescent lamp ballasting means comprises a conventional voltage doubler, which voltage doubler is adapted to operate from a regular power line AC input voltage and to supply a unidirectional...
4450385 Inductive ballasting of direct current gas discharges  
A ballast circuit for direct current gaseous electrical discharge devices includes a rectifying bridge, and an inductive ballast for storing excess energy. The rectifying bridge uses a pair of...
4447766 Supply device for a flash tube  
Supply device for a flash tube comprising a capacitor, a d.c. voltage source connected to the capacitor, an energy switch located between the capacitor and the flash tube, a circuit able to emit a...
4445074 Starting circuits for discharge lamps  
A starting circuit for discharge lamps includes a current limit device, a full wave rectifier circuit and a Cockcraft-Walton's circuit which are connected between a d.c. discharge lamp having a...
4438373 Low pressure metal vapor discharge lamp  
A low pressure metal vapor discharge lamp has a double-tube type discharge vessel consisting of a fully closed outer glass bulb and an inner glass tube substantially coaxially disposed in the outer...
RE31486 Rapid starting of gas discharge lamps  
A starting device for a gas discharge lamp, to whose electrodes AC voltage is applied, comprises: a. first means electrically connected with at least one lamp electrode to apply to the lamp a...
4417180 Lamp firing apparatus  
A discharge lamp firing apparatus is disclosed which includes providing only the necessary firing voltage to the lamp prior to the firing thereof. As such, the surrounding system is not subjected...
4417181 Electronic ballast  
An electronic ballast employs an electronic inverter which drives a main power transformer across the output of which terminations are connected for a plurality of fluorescent lamps. A high...
4412156 Power supply for an ac discharge lamp  
A power supply for an ac discharge lamp utilizes a switching transistor for turning on and off the dc current from a dc power circuit. The dc current is then fed to a low pass filter for supplying...
4400651 Method and circuit for operating an incandescent lamp  
A method and circuit for operating an incandescent lamp are disclosed in which the operating voltage applied to the lamp alternates in a regular and abrupt manner between forward and reverse...
4396872 Ballast circuit and method for optimizing the operation of high intensity discharge lamps in the growing of plants  
At least one high intensity discharge lamp is utilized in the growing of plants within a growth chamber. The lamp is connected to a power supply that provides pulses of alternating polarity to the...
4394603 Energy conserving automatic light output system  
An energy conserving lighting system is provided wherein a plurality of fluorescent lamps are powered by a poorly regulated voltage source power supply which provides a decreasing supply voltage...
4392086 Apparatus for operating a gaseous discharge lamp  
An apparatus for a gaseous discharge lamp includes a power controlling device for converting an AC voltage into a phase control output, a high frequency generating device for converting the output...
4388563 Solid-state fluorescent lamp ballast  
An improved solid-state fluorescent lamp ballast circuit in which rectified line voltage is chopped, utilizing high power field effect transistors, to provide a high frequency input to a...
4388559 Bicycle lighting system  
A flash tube is provided for producing successive high intensity bursts of light, and a pulse producing device is provided for supplying a train of high voltage pulses for energizing repeatedly the...
4388562 Electronic ballast circuit  
An electronic ballast circuit for powering a plurality of fluorescent lamps or the like from an unsmoothed DC voltage source includes a sine wave converter operatively connected to receive said DC...
4376912 Electrodeless lamp operating circuit and method  
An operating circuit and method for efficiently operating and starting an electrodeless lamp having a magnetic core operated at radio frequencies. The circuit generates a current which flows...
4371812 Light regulation system  
A light regulation system is provided wherein the light output of a fluorescent lamp(s) is regulated in accordance with the RMS value of the lamp arc current which is automatically adjusted to...
4356432 Solid state power switch for gas discharge lamps  
A solid state power switch for gas discharge lamps is disclosed which is capable of providing a bipolar signal to a lamp and which substantially eliminates losses due to switching delays of...
4340843 Keep-alive circuit for gas discharge lamp  
A circuit for starting and ballasting a compact high intensity arc discharge lamp, and for preventing failure of the arc discharge. A filament connected in series with the arc lamp provides...
4323821 Luminaire converter  
A converter circuit for use in changing a series wired primary ballast normally employed for operating a mercury vapor lamp to a more energy-efficient high intensity discharge lamp, such as a high...
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...
4316124 Mixed light arrangement  
The invention relates to a mixed light lamp arrangement intended to be connected to an a.c. power supply. The lamp arrangement comprises a rectifier bridge having output terminals interconnected by...
4316125 Power supply for a flash tube  
First and second rectifiers (37), (41) have inputs connected to an A.C. power source (12) through a unitary switch (33) and outputs connected to first and second smoothing filters (38), (42)...
4315195 High-voltage supply for power electron-beam guns  
A high-voltage power supply for an electron-beam gun with a heatable cathode and an anode and of the type having an electronic switch connected in the current circuit for the cathode and...
4296358 High-voltage spark source  
A spark source circuit has a discharge circuit including reactive means connected in circuit between a capacitor and an analytical spark gap and switching means for effectively removing the...
4293796 Traffic light dimming technique and circuitry  
A traffic light control circuit of the type utilizing solid state thyristor switches with their control terminals driven by a diode bridge trigger network that includes switches for selectively...
4277726 Solid-state ballast for rapid-start type fluorescent lamps  
A novel transistorized fluorescent lamp ballast and lamp combination operates from AC line voltage. The ballast provides for "soft-start" lamp operation in one featured aspect and provides for some...
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...
4272704 DC Power supply for high power discharge devices  
A D.C. power supply energized directly from an A.C. source including a voltage doubler circuit supplied with current from the A.C. source via a gate controlled bidirectional switch with the gate...
4272703 D.C. Voltage fluorescent lamp  
A fluorescent lamp having a plurality of columns positioned in a generally uniform manner within the lamp envelope, each column having an electron emissive cathode mounted therein connected to a...
4260932 Method and circuit for facilitating the starting and steady state flickerless operation of a discharge lamp  
The present application discloses a circuit for improving the efficiency of energy consumption, extending lamp life, and facilitating the starting and steady state flickerless operation of a...
4254364 Lamp regulator circuit for rotary camera  
A flow, or rotary type, microfilm recording apparatus for filming documents having a document transport means to move documents past an aperture area. An alternating current powered fluorescent...
4245177 Inverter for operating a gaseous discharge lamp  
A dc to ac inverter for operating a gaseous discharge lamp through pre-ignition, arc stabilization, warm-up and final run states is disclosed. The arrangement comprises a transformer and a pair of...
4237403 Power supply for fluorescent lamp  
Electrical power is converted into rectangular waves, which are loosely coupled to a fluorescent lamp. A parallel tank circuit resonant near the fundamental or a harmonic of the square wave...
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...
4211955 Solid state lamp  
An integrated circuit chip containing one or more light-emitting diodes is mounted within a light-diffusing encasement having a standard incandescent light bulb lamp base. The integrated circuit...
4209730 Starting circuit for gaseous discharge lamps  
A starting circuit suitable for sodium vapor street lamps is disclosed. The circuit includes a voltage doubler which periodically fires pulses through the lamp ballast. The pulsing is controlled by...
4199710 Ballast circuit for high intensity discharge (HID) lamps  
An electronic ballast circuit includes a directly driven high frequency inverter circuit with a series resonant output circuit coupled to a load circuit having a high intensity discharge (HID) lamp...
4194143 Power supply for flash lamp  
A power circuit for a discharge lamp, in particular a flash lamp serving as light source in an optical analysis apparatus which comprises an electric power source outputting a d.c. voltage and...
4189663 Direct current ballasting and starting circuitry for gaseous discharge lamps  
Direct current ballasting and starting circuitry for efficiently operating a gaseous discharge lamp on direct current. Series-pass switching means in one of a pair of input lines alternatively...
4188661 Direct drive ballast with starting circuit  
An electronic ballast circuit includes a direct drive high frequency inverter circuit with a tuned output circuit and a drive circuit dependent upon current flow in a load circuit. The high...
4188660 Direct drive ballast circuit  
A direct drive electronic ballast circuit suitable for a fluorescent lamp load includes a high frequency oscillator inverter circuit having a tuned output circuit coupled to a load and to a drive...
4187449 Discharge lamp operating circuit  
Circuit for providing low ripple DC power supply from a single-phase AC source without the use of a filter capacitor. The circuit comprises a high leakage reactance transformer with a primary...
4172981 Lighting system  
A highly energy efficient lighting system for fluorescent lamps is provided comprising a blocking oscillator having a dimmer for reducing power consumption. In one embodiment a built in power...
4170747 Fixed frequency, variable duty cycle, square wave dimmer for high intensity gaseous discharge lamp  
A dimmer circuit for an HID lamp is provided for supplying a square wave current therethrough at a constant frequency, but whose duty cycle is variable dependent on a sensed current level. The...
Matches 151 - 200 out of 510 < 1 2 3 4 5 6 7 8 9 10 11 >