|
Match
|
Document |
Document Title |
|
|
6744219 |
Operating circuit for a discharge lamp with preheatable electrodes
The invention relates to a novel operating circuit for a discharge lamp, in the case of which the lamp electrodes are preheated by driving switching transistors of an oscillator circuit such that...
|
|
|
6741040 |
Operating device for lamps with a regulated SEPIC converter
The invention relates to a novel operating device for lamps, in particular low-pressure gas discharge lamps, in which a SEPIC converter is used for charging a storage transistor from an AC voltage...
|
|
|
6741043 |
Ballast with adaptive end-of-lamp-life protection
A ballast ( 100 ) having an inverter ( 110,120,122 ) and a direct current blocking capacitor ( 130 ) coupled in series with a ballast output ( 108 ) includes a control circuit ( 140 ) for providing...
|
|
|
6741041 |
Power controller
A power controller is provided which can control the emission power from a light source to follow an appropriate response property based on a target value. The power controller includes feedforward...
|
|
|
6734639 |
Sample and hold method to achieve square-wave PWM current source for light emitting diode arrays
An apparatus for controlling overshoots in the switching of LED arrays in a system having a switching voltage converter providing the biasing voltage for the LED array. By synchronizing a switching...
|
|
|
6734637 |
Hot-restrike ignition system for a high-frequency high-intensity discharge lamp assembly
A hot-restrike ignition system for a high-frequency high-intensity discharge lamp includes a resonant circuit that is connectable across the lamp in parallel with a ballast circuit that is used to...
|
|
|
6734641 |
Device for turning on light and illumination apparatus
A device for turning on light allowing the brightness of an inverter-type illumination apparatus to be adjusted without having to install an additional oscillation circuit. The device comprises an...
|
|
|
6731078 |
Ballast for operating electric lamps
The invention relates to a ballast for operating electric lamps, having an inverter (WR), a DC voltage supply circuit (GLV) for the inverter (WR), a load circuit, connected to the inverter (WR),...
|
|
|
6727663 |
Circuit arrangement for feeding a load
An electronic ballast for supplying a lamp comprises a control loop for controlling the rms value of an operational parameter so as to be constant. In the control loop, the actual rms value of the...
|
|
|
6727662 |
Dimming control system for electronic ballasts
A dimming control system includes a first circuit ( 100 ) and a second circuit ( 400 ). First circuit ( 100 ) is coupled in series with the AC line source ( 10 ) and receives brighten and dim...
|
|
|
6727661 |
Self-ballasted fluorescent lamp
The invention provides a self-ballasted fluorescent lamp provided with a function for operating normally when the self-ballasted fluorescent lamp is inadvertently connected to a lighting fixture...
|
|
|
6724154 |
Cold cathode lamp and lamp control circuit
A cold cathode gas discharge lamp unit and control circuit for controlling the light emission of the cold cathode gas discharge lamp. A lamp unit includes a dc power source and a control circuit...
|
|
|
6720738 |
Method and circuit arrangement for producing an ignition voltage for fluorescent lamps
The invention, which relates to a method for generating a starting voltage for a fluorescent lamp, in which the starting voltage is generated by means of alternating voltage that is impressed on an...
|
|
|
6720741 |
Electronic ballast having open circuit in output
Gas discharge lamps may conduct current from the common rail to earthen ground through a fixture containing the lamps. A transistor is coupled in series in the current path to the common rail. When...
|
|
|
6717372 |
Multi-lamp driving system
A multi-lamp system for driving a lamp set having a first lamp and a second lamp comprises a driving circuit for converting a DC signal to an AC signal, a transformer having a primary side coupled...
|
|
|
6717375 |
Discharge lamp lighting device and system comprising it
A discharge-lamp lighting device is provided which decreases arc jumps, suppresses the fluctuation in brightness of the lamp, and prolongs a life of the lamp, by positively accelerating growth of...
|
|
|
6717370 |
High speed stop circuit for an electronic ballast
In an electronic ballast equipped with a high-frequency bridge circuit, a microprocessor for controlling lamp operation and a stop circuit for interrupting the operation of the ballast in case of a...
|
|
|
6713744 |
Scanner having cold-cathode-tube light source and method of controlling a drive signal for illuminating a cold-cathode-tube light source
The scanner includes the switch 10 that is closed when a document is read, the boosted-voltage conversion circuit 12 that boosts a DC voltage of 12 volts (V) supplied from a power source (not...
|
|
|
6710555 |
Discharge lamp lighting circuit with protection circuit
A discharge lamp lighting circuit includes an open-circuit protection means to protect a driving means when a discharge lamp is not lighted. The open-circuit protection means is adapted to send out...
|
|
|
6710552 |
Circuit arrangement for operating discharge lamps
In the case of circuit arrangements for operating gas-discharge lamps (Lp), a charge pump (D 5 , D 6 , C 31 , C 32 ) is often used for the purposes of power-factor correction. If this is the case,...
|
|
|
6710556 |
Discharge lamp lighting apparatus
In a discharge lamp lighting apparatus 1 , power is supplied from a DC power supply 2 through a switch control circuit 3 to a lighting circuit 4 and a discharge lamp 5 . Power is supplied...
|
|
|
6707262 |
Discharge lamp operating circuit having a circuit for detecting the proximity to capacitive operation
The invention relates to an operating circuit for a discharge lamp, having a detection circuit for identifying the proximity to capacitive operation, which uses lamp current fluctuations for...
|
|
|
6707260 |
Circuit arrangement including DC-AC converter having a dependable start circuit
A self-oscillating bridge circuit comprises a start circuit for rendering one of the switches conductive for the first time at the start of operation. The start circuit is configured in such a way...
|
|
|
6707263 |
High-intensity discharge lamp ballast with live relamping feature
A dimming ballast ( 100 ) for a high-intensity discharge lamp ( 10 ) includes an ignitor ( 120 ), a control circuit ( 140 ), and a dimming interface ( 160 ) for connection to an external dimming...
|
|
|
6703797 |
Method for activating illuminator and illumination device
A method for activating an illuminator and an illuminating device. The invention uses pins on an application specific integrated circuit (ASIC) in a scanner to output pulses of different...
|
|
|
6703793 |
Switching power unit
The switching power unit is a switching power unit of PWM system in which, in response to a secondary-side output voltage detected by an output voltage detecting circuit, a control circuit controls...
|
|
|
6700335 |
Method and circuit for regulating power in a high pressure discharge lamp
A ballast ( 100 ) and method for regulating power in a high pressure discharge lamp ( 130 ) is disclosed. In a preferred embodiment, ballast ( 100 ) comprises a microcontroller ( 102 ), a buck...
|
|
|
6700328 |
Discharge lamp driver circuit designed to minimize radiation or noise
A discharge lamp driver circuit is provided which features a field canceller. The driver circuit includes a power supply circuit which turns on and off a switching element to step up a dc voltage...
|
|
|
6700331 |
Control circuit for dimming fluorescent lamps
The present invention constitutes a control circuit which permits the dimming of the illumination emitted from a fluorescent lamp. A controllable source of alternating current power is converted to...
|
|
|
6696798 |
Ballast circuit for operating a discharge lamp
A ballast circuit for a discharge lamp capable of protecting the circuit when the lamp reaches its end of life with a cost effective circuit arrangement. The circuit includes a DC voltage sensing...
|
|
|
6696791 |
Method for starting a discharge lamp
A method for starting a discharge lamp having two filaments includes the following steps: ( 1 ) preheating only one of the two filaments; ( 2 ) igniting the lamp; ( 3 ) operating the lamp with a...
|
|
|
6696803 |
Self-oscillating electronic discharge lamp ballast with dimming control
A simplified electronic ballast for a discharge lamp which provides dimming by control of inverter frequency through modulation of magnetizing current in a transformer such that the switching...
|
|
|
6696800 |
High frequency electronic ballast
A method and ballast for driving a high intensity discharge (HID) lamp include generating a very high frequency driving signal for the HID lamp, generating a low frequency modulating signal,...
|
|
|
6696797 |
Electronic ballast having valley frequency modulation for a gas discharge lamp
An electronic ballasts for a gas discharge lamp. The ballast includes a variable frequency power generator, a tuned driver network, and a valley correction modulation system. The driver network has...
|
|
|
6693393 |
Ballast for a discharge lamp
A ballast for a discharge lamp includes a DC-DC converter which provides a regulated DC output so as to start and keep operating the lamp. A controller is included to give a closed-loop control for...
|
|
|
6686703 |
High frequency electronic ballast
An improved high frequency ballast is disclosed. The high frequency ballast establishes a lamp current for a gas discharge lamp during a starting operation of the gas discharge lamp wherein an...
|
|
|
6683419 |
Electrical control for an LED light source, including dimming control
A control for a light with an LED light source. The LED light source mimics an operation of an incandescent light source with respect to a dimming control. The LED light source includes at least...
|
|
|
6683418 |
Inverter type illumination lighting apparatus
An illumination lighting apparatus has a resonance load circuit including a discharge tube, a power supply circuit for generating DC voltage from commercial AC voltage, and an inverter for...
|
|
|
6680584 |
Device for driving discharge lamp
A referential rectangular wave is generated in a referential rectangular wave generating circuit 21, a level of the referential rectangular wave is integrated in an integrating circuit 22 to...
|
|
|
6680585 |
Method and apparatus for modulating HID ballast operating frequency using DC bus ripple voltage
An apparatus and method to implement an electronic ballast for a high intensity discharge lamp having AC lamp current centered at approximately 300 kHz minimizes the ballast cost and utilizes...
|
|
|
6680583 |
Sign lamp lighting transformer with protective functions
An abnormality detection circuit detects abnormality relating to ground fault in secondary winding circuitry of transformer, non-grounding fault of transformer assembly casing or false connection...
|
|
|
6680582 |
System and method for employing pulse width modulation for reducing vertical segregation in a gas discharge lamp
A system for driving a gas discharge lamp includes a bridge circuit providing a pulse voltage signal, a controller which generates a pulse width modulated signal corresponding to a desired...
|
|
|
6680588 |
Low noise backlight system for use in display device and method for driving the same
Disclosed is a backlight system and a method for driving backlight capable of reducing noises and voltage fluctuations in power voltage due to a turn-on/turn-off of the lamp. The backlight system...
|
|
|
6677716 |
Operating device for gas discharge lamp
Free-running half-bridge inverter (HP) for operating gas discharge lamps having a current transformer as a feedback device. The half-bridge transistors (T 1 , T 2 ) are essentially voltage...
|
|
|
6677718 |
HID electronic ballast with glow to arc and warm-up control
An HID ballast is powered by a power source to control a load. The HID ballast includes a switching section connected to a first bus and a second bus, and further configured to output a...
|
|
|
6674252 |
Non-blinking direct current fluorescent lamp circuit
A non-blinking direct current fluorescent lamp circuit includes a switch, a bridge rectifier, a voltage regulation circuit, a filter capacitor, an ignition circuit, a contact points converter, a...
|
|
|
6674246 |
Ballast circuit having enhanced output isolation transformer circuit
A ballast circuit includes an output isolation transformer having a primary winding and first and second secondary terminals coupled to opposing ballast lamp terminals for additively applying...
|
|
|
6670778 |
AC power generating apparatus having electrolytic capacitor and ceramic capacitor
An AC power generating apparatus for lighting a discharge lamp has a smoothing circuit with an electrolytic capacitor therein for smoothing ripples included in a DC voltage supplied from a power...
|
|
|
6670780 |
Method for operating high-pressure discharge lamp, lighting apparatus, and high-pressure discharge lamp apparatus
Disclosed is a method for operating a high-pressure discharge lamp, a lighting apparatus, and a high-pressure discharge lamp apparatus each capable of operating the lamp at a power lower than the...
|
|
|
6667587 |
Flickering mode control system for a high intensity discharge lamp
A flickering mode control system, for operating a high intensity discharge lamp at a flickering mode, comprises an output power controllable transformer and a flickering control unit. The...
|