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8143794 |
Low voltage light source driving circuit
A low voltage LED (Light Emitting Diode) driving circuit operates under low supply voltage to provide stable and reliable control of LEDs. The LED driving circuit includes a switching transistor to...
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8115401 |
Safety starter device
A safety starter circuit for a gas discharge lamp includes a series arrangement of a glow switch starter, a resistive element, and a thermally controlled switching element. The thermally controlled...
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8115403 |
Method of starting an HID lamp and ballast incorporating same
There is provided herein a method for starting a high intensity discharge lamp and a ballast incorporating the same. In a preferred embodiment, the method comprises the steps of: (a) obtaining a...
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7919926 |
Aggregate ignition method in high frequency metal halide lamps
A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The controller selectively enables and disables the oscillator via the switch to ignite the...
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7893628 |
Electronic circuit for operating a plurality of gas discharge lamps at a common voltage source
The presented circuit makes it possible to operate a plurality of gas discharge lamps, particularly cold cathode tubes, at a common voltage source. The uniform distribution of current to all the...
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7825604 |
Drive circuit supplying current to load based on control signal, and portable information terminal including the same
A drive circuit (100) includes an operational amplifier (OP1) that compares a voltage applied to an inverting input terminal with a reference voltage applied to a non-inverting input terminal, a...
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7643267 |
Optical emission spectrometry device
An optical emission spectrometry device is provided. In the optical emission spectrometry device, a discharge path is formed by connecting an ignition circuit to a discharge gap, and further...
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7548031 |
Lighting apparatus for discharge lamp
In the transient electric power control of a discharge lamp containing no mercury or a small amount of mercury, a change value relating to a lamp voltage from the initial value thereof is detected....
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7541858 |
Integration circuit, decrement circuit, and semiconductor devices
An ignitor comprising a circuit with a millisecond order time constant and with a minimum circuit size and area, which is capable of self-shutdown without leading to erroneous ignition upon...
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7459861 |
Lamp containing voltage conversion circuit including forward/reverse hybrid phase-control clipping circuit
A lamp contains a lamp voltage conversion circuit which includes a forward/reverse hybrid phase-control clipping circuit that clips a load voltage and provides an RMS load voltage to the lamp. The...
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7436127 |
Ballast control circuit
A ballast control circuit having a bridge driver for driving a transistor bridge of a ballast circuit coupled to a resonant ballast output stage including a lamp, the ballast control circuit...
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7432663 |
Circuit for igniting a high intensity discharge lamp
A circuit (300) for igniting a high intensity discharge (HID) lamp comprises input terminals (302,304), output terminal (306,308), a charging circuit (RIGN,CIGN), a transformer (320) having a...
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7432662 |
Circuit arrangement and method for operating at least one lamp
The present invention relates to a circuit arrangement for operating at least one lamp (LA), which has a first filament (W1) and a second filament (W2), it comprising an apparatus (10) for...
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7385356 |
Energy saving startup circuit for power supply
A startup circuit (30) for a power supply (44), has an input (31) for connecting to a source of high voltage thereto, and an output rail (33) for feeding rectified voltage to the power supply. A...
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7365497 |
Discharge lamp ignition device and projector
To avoid the phenomenon of unsightly flickering in images projected by the projector, in high pressure discharge lamps—especially in high intensity discharge lamps, such as high pressure mercury l...
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7341051 |
Electronic high frequency plasma catalyzer
The catalyzer is applicable in the ignition of gasoline engines of transportation vehicles, generates, stand alone and stationary machines and others. Its advantage is that it has a higher quality...
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7215523 |
Apparatus for protecting an integrated circuit and method thereof
An apparatus for protecting an integrated circuit is applied to an electrical apparatus having a control unit. The control unit is used for controlling the integrated circuit and the protecting...
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7196480 |
Method of soft-starting a switching power supply containing phase-control clipping circuit
A method of operating a power controller that converts a line voltage to an RMS load voltage includes a soft start in which a conduction angle of a phase-control clipping circuit is gradually...
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7166969 |
Drive circuit for illumination unit
In case of driving a plurality of lamps with the use of a plurality of output transformers, a difference in the bright-ness of each lamp occurs by a dispersion of characteristics of the output...
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7141935 |
Inverter circuit for surface light source system
An inverter circuit for discharge lamps, in which transformers are separated into multiple small or middle-sized transformers connected to one another to provide a high-power transformer equivalent...
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7141941 |
Staggering switching signals for multiple cold cathode fluorescent lamp backlighting system to reduce electromagnetic interference
In order to minimize switching-induced electromagnetic interference in a power supply switching circuit of the type used to control the AC power for multiple high voltage devices, such as cold...
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7095182 |
Ignition control apparatus for internal combustion engine
An ignition control apparatus for an internal combustion engine of the present invention has a switching circuit and a control circuit. The switching circuit includes a first switch controlling a...
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7095181 |
Method and apparatus for controllably generating sparks in an ignition system or the like
An apparatus for controllably generating sparks is provided. The apparatus includes a spark generating device; at least two output stages connected to the spark generating device; means for...
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7075247 |
Controller and driver architecture for double-ended circuitry for powering cold cathode fluorescent lamps
A distributed controller and DC voltage switch-driver system supplies AC power to a cold cathode fluorescent lamp of the type used to backlight a liquid crystal display. The system includes a local...
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7053562 |
Lamp containing soft-start power supply
A lamp includes a lamp voltage conversion circuit which converts a line voltage to an RMS load voltage by clipping or modulating a load voltage. The voltage conversion circuit includes a time-based...
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6989637 |
Method and apparatus for a voltage controlled start-up circuit for an electronic ballast
A voltage control startup circuit for a lighting ballast includes first and second transistors for converting direct current from a voltage source into alternating current to operate a lamp. The...
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6941869 |
Sensor for monitoring electronic detonation circuits
A voltage sensor (10) for monitoring electronic ignition circuits (1) which contains a plurality of igniters (4) connected to an ignition line (3) and an ignition device (2) connected to the...
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6848437 |
Ignition device for an internal combustion engine
The ignition device for an internal combustion engine includes, a control unit (1) for outputting an ignition signal used to determine a time when an ignition plug (8) should be ignited, a...
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6756744 |
Method of initiating lighting of a discharge lamp, circuit for lighting a discharge lamp, light source device using the circuit, and optical instrument incorporating the light source device
A method of initiating lighting of a discharge lamp is provided including applying to the discharge lamp to be lighted an initiating voltage resulting from superimposition of a step-up pulse...
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6539929 |
Ignition device for an internal combustion engine
A one-chip integration circuit including a power part and a control part integrated within an IGBT monolithic silicon substrate is disclosed. The control circuit part comprises a current limiting...
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6389050 |
High-speed CMOS driver for vertical-cavity surface-emitting lasers
High-speed driver circuits interface with and enhance the performance of vertical-cavity surface-emitting laser (VCSEL) diodes used within fiber optic communication systems, according to...
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6339296 |
Low profile emergency ballast
An emergency ballast for a low profile fluorescent lamp fixture including an AC ballast including an end of lamp life shut down circuit. The emergency ballast includes a timing circuit which...
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6333604 |
Integrated ignition circuit and method
An integrated circuit (10) for driving an ignition coil (14) has a first transistor (30) providing a coil current (ICOIL) at a first lead (22) of the integrated circuit. A second transistor (32)...
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6257216 |
Device for suppressing undesired ignitions in a spark ignition engine
The primary winding of an ignition coil is connected in series with an ignition switch that can be switched by a control circuit. A circuit including a capacitor, a resistor, and a diode is...
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6188180 |
Ignition circuit for automotive high intensity discharge lamps
An ignition circuit for a high intensity discharge (HID) lamp, comprising: first and second series coupled switching transistors connected across upper and lower voltage buses to which a source of...
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6167876 |
Circuit arrangement for an ignition stage, in particular for the ignition circuit of a motor vehicle
A circuit arrangement of an ignition output stage, in particular for an ignition circuit of a motor vehicle, is described. The circuit arrangement includes a multiple Darlington transistor...
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6107748 |
Circuit arrangement of a final ignition stage
A circuit arrangement of an ignition output stage in particular for an ignition circuit of a motor vehicle, having a switching arrangement which triggers a primary winding of an ignition coil, and...
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6081074 |
Method and apparatus for offsetting power draw in a multiple channel system
An apparatus and method are disclosed for reducing peaks of operating power drawn from a power source by a multi-channel system. Each channel of the system drives a load and demands operating power...
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6049176 |
Ignition device for an internal combustion engine
An ignition device for an internal combustion engine capable of suppressing not only a decrease in the discharge energy of the spark plug but also the LC resonance itself. When an igniter 13 is...
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5970964 |
Circuit device for igniting internal combustion engine and semiconductor device for igniting internal combustion engine
A circuit is provided in which a voltage due to a minute current is applied to a gate terminal from a collector terminal when a collector voltage is higher than a gate voltage in an operation of...
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5886476 |
Method and apparatus for producing electrical discharges
A dual primary, single secondary ignition coil and control provides for establishment of a continuous extended arc across a pair of electrodes or dual arcs across the pair of electrodes. Continuous...
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5875749 |
A.C. ignition system for an engine
An a.c. ignition system for an engine, with an ignition transistor that switches the primary winding of an ignition coil, with a control circuit for controlling the ignition transistor and a...
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5852381 |
Turbine engine ignition exciter circuit including low voltage lockout control
An improved turbine engine ignition exciter circuit. Energy stored in an exciter tank capacitor is subsequently switched to the load (igniter plug) through a novel thyristor switching device...
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5690085 |
Control circuit for ignition coil
An ignition coil control circuit for controlling a current flowing to a primary coil of an ignition coil, comprises a switching circuit for switching the primary coil of the ignition coil, a...
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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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5621278 |
Ignition apparatus
A charging circuit charges a first capacitor to a first voltage and a second capacitor, via a potential divider to a second voltage smaller than the first voltage. A trigger circuit repeatedly...
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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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5592118 |
Ignition exciter circuit with thyristors having high di/dt and high voltage blockage
An improved turbine engine ignition exciter circuit. Energy stored in an exciter tank capacitor is subsequently switched to the load (igniter plug) through a novel thyristor switching device...
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5587630 |
Continuous plasma ignition system
A continuous plasma ignition system includes an exciter 12, an ignitor plug 16 and a cable 18 which connects the excitor 12 to the ignitor plug 16. The ignition system operates at the resonant...
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5569982 |
Clamping circuit for IGBT in spark plug ignition system
An ignition circuit for a spark plug includes an IGBT switch with a foldback clamp circuit. The foldback clamp has a first high clamp voltage for a first short interval to fire the spark plug,...
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