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4167688 |
Composite illumination fixture and control circuit therefor
A control circuit including at least one switch and a plurality of rectifiers for selectively applying a-c utility power to either or both of two remote electrically-powered apparatus at respective...
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4163177 |
Oscillation generator providing oscillations of varying amplitude
An oscillation generator providing a succession of oscillations repetitively and progressively varying in amplitude includes a feedback oscillator arranged to receive its operating voltage from a...
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4158793 |
Gas discharge lamp control circuit
An energizing circuit for gas discharge lamps for room or street lighting or for lights used in document copying machines and the like comprises means for continuously energizing the same at a low...
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4155032 |
Constant illumination apparatus
An apparatus that provides constant illumination in response to an AC input power source having variable magnitude. The input power passes through a full wave rectifier and is then switched by a...
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4143302 |
Energizing circuit for a fluorescent lamp
A fluorescent lamp fires more quickly at low temperature and its service life is lengthened if the input terminals of a full-wave rectifier are connected to the lamp electrodes and a resistor and...
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4127798 |
Lamp circuit
A system for operating gas discharge lamps at high frequency from a high voltage supply, typically 115 V AC with a 160 watt, 25,000 Hz output. The system provides efficient conversion, having the...
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4127795 |
Lamp ballast circuit
A highly efficient tuned oscillator ballast circuit especially suitable for a fluorescent lamp load includes an oscillator circuit coupled to a pulsed DC potential source and having a tuned output...
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4122375 |
Circuit arrangement for increasing the luminous flux in fluorescent tube hand lamps
A circuit for the operation of fluorescent lamps which allows the current through the lamps to be raised above the manufacturer recommended limit without adversely effecting the lamps. Two...
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4122374 |
Circuit arrangement for increasing the luminuous flux in fluorescent tube hand lamps
A circuit for the operation of fluorescent lamps which allows the current through the lamps to be raised above the manufacturer recommended limit without adversely effecting the lamps. Two...
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4121136 |
Apparatus for feeding discharge lamps from a direct current source
Apparatus for feeding a discharge lamp such as a mercury vapor lamp mounted in series with a choke from a direct current source comprising a chopper of direct current including an electronic switch...
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4119888 |
Operating circuit for flash lamp directly coupled to AC source
A circuit for operating an arc discharge flash lamp that is directly coupled across an alternating current (AC) source. The lamp is ignited by a high voltage pulse generated by a trigger circuit...
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4117377 |
Circuits for starting and operating ionized gas lamps
The specification discloses a low loss ballast system for reducing the electrical power required to operate fluorescent and other ionized gas lamps as well as several unique starting and operating...
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4109307 |
High power factor conversion circuitry
A high power factor conversion circuit suitable as a ballast circuit for lamps includes a full-wave rectifier coupled to an AC potential source and providing a pulsating DC potential. A high...
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4107579 |
Starting and operating ballast for high pressure sodium lamp
The HID lamp starting and operating apparatus of the invention includes inductive ballast means containing a winding and a core of magnetic material which may form a reactor or a transformer, and...
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4101811 |
Delayed extinction control
Alternating current energized appliances, particularly lamps, are extinguished in delayed fashion with the power delivered to the appliance being sharply reduced during at least the last portion of...
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4100463 |
Magnetron, power supply, and fan integral assembly
A magnetron oscillator, a source circuit for energizing the magnetron oscillator and a fan are contained in independent casing units and the casing units are removably connected together into an...
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4084217 |
Alternating-current fed power supply
An A.C. voltage fed power supply for D.C. gas-discharge lamps is disclosed having full-wave rectifying means connected on the A.C. side to at least two phase-adjusting networks for forming mutually...
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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...
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4072878 |
Starting and operating apparatus for high pressure sodium lamp ballasts
A lighting apparatus which provides for high voltage pulses for starting a high pressure sodium lamp. This apparatus uses a zener diode circuit which provides appropriately timed starting pulses...
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4071808 |
Method and circuit for operating an electrical flash-tube
A relatively infinitely incremental mode of obtaining any desired brightness of flash from an electrically operable flash-tube is attained by employing plural capacitors, each having a charging...
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4069442 |
Pulse circuit for gaseous discharge lamps
Circuit operating from a direct current source applies DC pulses to a high pressure sodium vapor lamp to improve the color rendition of the lamp. The circuit includes a thyristor switch in series...
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4048543 |
Discharge lamp operating circuit
Circuit operating from a direct current source applies DC pulses to a high pressure sodium vapor lamp to improve the color properties of the lamp. The circuit includes a controlled thyristor switch...
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4045708 |
Discharge lamp ballast circuit
Electrical ballast circuit for operating gaseous discharge lamps with direct current. An inductive reactor coil connected to an alternating current source is connected to a discharge lamp via a...
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4045711 |
Tuned oscillator ballast circuit
A fluorescent lamp ballast circuit includes a tuned oscillator coupled to a pulsed DC potential source and to a transformer having a first winding directly connected to the oscillator and in series...
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4045710 |
Discharge lamp operating circuit
Color rendition of high pressure sodium vapor discharge lamps is improved by disclosed operating circuit for applying pulsed direct current to the lamp. The circuit includes a direct current...
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4042856 |
Chopper ballast for gaseous discharge lamps with auxiliary capacitor energy storage
A single phase, high frequency chopper ballast without large magnetic and capacitive components for gaseous discharge lamps such as the Lucalox R lamp is operated on full wave rectified line...
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4041351 |
Flash lamp power supply with direct energization from an AC power supply source
A method of energizing a laser source stimulating flash lamp directly from an AC power line. Uncontrolled diodes couple the anode and cathode of the flash lamp directly to the AC line. The lamp is...
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4039897 |
System for controlling power applied to a gas discharge lamp
A system for controlling power applied to a gas discharge lamp by an AC source, wherein the power dissipated in the lamp during a half cycle is sensed by a measuring circuit. The measuring circuit...
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4039895 |
Device for starting and feeding a discharge lamp
A device for starting a discharge lamp by means of a transistor starter provided with an auxiliary transistor for stopping the starting procedure if the lamp fails to ignite. A zener diode is...
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4029989 |
Electric discharge lamp with voltage multiplier circuit having a capacitance which changes with temperature
A discharge lamp for connection to an associated alternating current power supply. The lamp is provided with two main electrodes and a starting electrode. Two diodes are connected in series, in...
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4023066 |
Operating circuit for a gas and/or vapour discharge lamp
An improved method of and apparatus for operating an electric discharge lamp which includes a controlled semiconductor switch connected in shunt with the lamp. By means of the semiconductor switch,...
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4010398 |
Electric device provided with a gas and/or vapor discharge lamp
The invention relates to a mixed-light lamp. According to the invention the lamp is connected to a cascade circuit of two capacitors and two diodes. The increase in voltage obtained with that...
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4004187 |
Push-pull inverter ballast for arc discharge lamps
A push-pull ballast for an arc discharge lamp has a high power portion comprising a semiconductor switching inverter and transformer means for step-up or step-down of voltage to be supplied to a...
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4001637 |
Lamp ballast
A ballast circuit for coupling a lamp to an AC power source and having in series between the source and lamp a non-dissipative current limiting capacitor feeding a rectifier, the output of the...
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3999100 |
Lamp power supply using a switching regulator and commutator
A power supply for an ac metal halide lamp employs a dc regulator in conjunction with a commutator for supplying the regulated dc power to the lamp with alternating polarity. A feedback circuit...
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3978369 |
Solid state starter apparatus for a discharge lamp
A solid state starter apparatus for a discharge lamp comprises a current limiter, an AC power supply, a discharge lamp of filament-preheating type and a switching circuit for controlling the...
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3945003 |
Multi-level television receiver channel indicia display
A channel number display device for a television receiver for displaying the numerals of the channel to which the receiver is tuned with the display being initially bright immediately after a...
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3938000 |
Lamp driver for telephone panel indicator lamps
An electrical circuit for limiting surge currents through incandescent indicator or display lamps is disclosed. It is essentially a constant current device having a current controlling transistor...
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3927349 |
Zero crossing SCR light dimmer
A SCR light dimmer apparatus to control the brilliance of high wattage incandescent lamps from a 400 Hz supply without generating any substantial amount of radio interference.
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3925705 |
Low-cost power-reducing device for hid lamp
Add-on device for high-intensity-discharge lamp and ballast which reduces the wattage at which the lamp is operated. The add-on device has two parallel circuit paths, one of which is an RC circuit...
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3921035 |
Solid state switching circuit
A switching circuit employed in one aspect of the invention a high intensity discharge lamp ballast, the switching circuit having high efficiency switching characteristics over a wide range of...
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3919592 |
High intensity discharge mercury vapor lamp dimming system
A switching regulator has its output applied to a high intensity discharge mercury vapor lamp which has a parallel-connected capacitor. The capacitor has a value of less than about 2 microfarads...
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3917975 |
Strobe light
A strobe light for use in photography having a low voltage d-c source of energy which is used to provide a charging of high voltage capacitors and with the discharge of the high voltage capacitors...
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3906302 |
Arrangement provided with a gas and/or vapour discharge lamp
The invention relates to an arrangement provided with a gas and/or vapour discharge lamp. According to the invention the lamp is shunted by an inductor and is arranged in series with a transistor...
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3904921 |
Starting device for discharge lamp
A discharge lamp lighting device comprises a first silicon symmetrical switch adapted to be turned "on" when a voltage to be applied across both ends of a discharge lamp reaches a predetermined...
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3903454 |
Electric circuit for energizing and deenergizing an exciter lamp of a talkie projector
The electric circuit for energizing and deenergizing an exciter lamp of a talkie projector having an optical sound reproducing head in accordance with the present invention comprises a constant...
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3903452 |
Flickerless discharge lamp lighting apparatus
A flickerless discharge lamp lighting apparatus for at least two discharge lamps having first and second discharge lamp circuits connected respectively a first AC source capable of starting the...
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3899713 |
Touch lamp, latching AC solid state touch switch usable with such lamp, and circuits for the same
A lamp having at least two areas such that when one is touched a solid state latching AC powered switch turns the lamp on and when another is touched the latching action is disabled to turn the...
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3898006 |
Exposure lamp control device
A device for controlling an exposure lamp for projecting an original image by changing pulse repetition rate or pulse width which activates the lamp. There are included a pulse oscillator, a pulse...
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3893002 |
Switch-controlled continuously progressive dimmer circuit
A dimmer circuit for lighting in which the brightness of a lamp or lamps is controlled by the potential across a storage capacitor. The potential may be varied by operating a switch and the rate of...
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