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7626341 |
Discharge lamp lighting apparatus
A discharge lamp lighting apparatus includes an input power supply, a power supply circuit, a bridge circuit having switching elements that performs AC operation of a discharge lamp, a lighting...
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7619369 |
Method and circuit arrangement for operating a discharge lamp
A method and a circuit arrangement for operating a discharge lamp, in particular during the first hours of operation after lamp manufacture, are described. The method and the circuit arrangement...
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7605549 |
System and method for current and/or temperature control of light fixture
A system for current and/or temperature control of light fixtures includes a sensor in communication with a light fixture, sense a current flow or a temperature of the light fixture, and...
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7598682 |
Current regulator apparatus and methods
An apparatus according to the present invention provides regulated pulsed current to an LED from a voltage source such as a rectified AC voltage. The present inventions provide methods for...
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7589480 |
High intensity discharge lamp ballast
A low current loss ballast operates a high intensity discharge lamp with or without radioactive krypton. A by-pass capacitor in conjunction with a resonant strike circuit limits high frequency...
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7589475 |
Electric lamp with enhanced dependability
The lamp comprises at least one light-emitting diode and an electronic power switch connected in series between a power source and the light-emitting diode. The electronic power switch is...
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7586267 |
Inverter system and detecting device thereof
A detecting device of an inverter system comprises at least one detecting element and at least one comparative unit. The detecting element is electrically connected to any one of the connecting...
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7557515 |
Simplified ballast control circuit
A ballast control circuit for use with a fluorescent lamp in accordance with an embodiment of the present application includes a voltage controlled oscillator operable to provide an operating...
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7545369 |
Methods and apparatus to improve efficiency in cold cathode fluorescent light controllers
Methods and apparatus to improve efficiency in cold cathode fluorescent light (CCFL) controllers using a full bridge resonant implementation. The secondary of a transformer drives the CCFL, with...
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7535184 |
Photopolymerization apparatus
A light-weight, portable photocuring device possesses a single light emitting diode (LED). The single LED backed with a heat sink is driven by a driving circuit and controlled by a timing circuit....
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7535183 |
Apparatus and method to provide a hybrid linear/switching current source, such as for high-efficiency, wide dimming range light emitting diode (LED) backlighting
A hybrid power supply provides powers to a load, such as a light emitting diode (LED) backlight display, using pulse wave modulation (PWM) enable signal to control activation of a linear power...
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7531965 |
Discharge centering lamp lighting device
A discharge lamp lighting device can reduce a variation in luminous flux at the time when the polarity of a voltage to be applied to the discharge lamp is inverted, prevent an excessively large...
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7528558 |
Ballast with ignition voltage control
A ballast ( 10 ) for powering a lamp load ( 70 ) comprising one or more gas discharge lamps ( 72,74 ) includes an inverter ( 200 ), a resonant output circuit ( 400 ), and a control circuit ( 600 )....
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7514878 |
High frequency electronic ballast with sine wave oscillator
A high frequency sinusoidal wave is generated and applied directly to a gas discharge lamp in a power efficient electronic ballast. Uniting a high frequency current fed oscillator with a...
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7498750 |
Gas discharge lamp driving circuit and method with resonating sweep voltage
A gas discharge lamp is driven using a high frequency lamp current. A lamp driving circuit comprises a high frequency bridge circuit for supplying said lamp current. To prevent the lamp from...
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7495398 |
Discharge lamp lighting apparatus
A discharge lamp lighting apparatus includes: an inverter circuit including a switch circuit and a high-voltage transformer; a step-up circuit connected at the input stage of the inverter circuit;...
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7486030 |
Universal input voltage device
A universal input voltage device is presented which may receive a wide range of regulated and unregulated input voltages, both DC and a wide range of variable frequency AC, and output a desired...
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7482758 |
Magnetic low voltage dimmer
The present invention provides a magnetic low voltage dimmer circuit that reduces DC magnetizing current which may be present in a dimmer system. The dimmer circuit delivers an RMS value of an AC...
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7474063 |
Anti-cycling control system for luminaires
An anti-cycling luminaire control system may detect repeated lamp-off conditions and interrupt power to the lamp and provide an indication of lamp cycling after a predetermined number of lamp-off...
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7466083 |
Protective device for vehicle electronic apparatus
A protective device for a vehicle electronic apparatus, which includes an inverter for converting a direct-current voltage into an alternating-current voltage for the vehicle electronic apparatus,...
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7456587 |
Digital controlled light source driving apparatus
A digital controlled light source driving apparatus includes a digital processor and a step-up circuit. The digital processor has a digital switching-signal generating module and a protecting...
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7456581 |
Power supply, backlight apparatus, and display device
A power supply includes a light source, a signal converting unit converting an externally supplied AC voltage into a DC voltage, a DC-DC converting unit converting a magnitude of the DC voltage,...
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7449841 |
Charge limited high voltage switch circuits
High voltage switches are configured with a junction transistor driven with a transformer coupled AC drive signal in the common base configuration or driven by a capacitor coupled charge pump. The...
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7443106 |
Circuit with switch-off device for the operation of light sources
Circuit with a switch-off device for the operation of light sources The invention relates to a circuit with a switch-off device for the operation of light sources (Lp), have the following...
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7429830 |
Power control of a fluorescent lamp
A fluorescent lamp ( 2 ), in particular a backlight lamp of a display device, is supplied with an alternating voltage, a frequency and an amplitude of which being greater during ignition than...
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7420333 |
Mixed mode control for dimmable fluorescent lamp
A mixed mode control for dimmable fluorescent lamp provides a smooth and continuous control of output of the lamp. A load threshold, below which the output of the discharge lamp could not be...
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7402960 |
LED-based lamp apparatus
A LED-based lamp apparatus includes a LED unit having multiple LEDs connected in series, a step-up circuit for stepping up a power supply voltage by a switching action of a switching element to...
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7397196 |
Circuit arrangement for preventing high peak currents
A driver for HID lamps includes four switches and generates a constant DC-current that is commutated at a low frequency. The driver includes a filter capacitor. The occurrence of peak currents due...
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7394212 |
Inverter and inverter unit thereof
An inverter unit including a converter, a transformer, a feedback circuit and an open lamp lock circuit is provided. The converter receives a drive signal, and outputs a duty voltage signal...
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7388335 |
Apparatus for providing a sinusoidally amplitude-modulated operating voltage, lighting system and method for generating an amplitude-modulated voltage
In the case of an apparatus for providing a sinusoidally amplitude-modulated operating voltage, two switches are arranged in the form of a half bridge, and an LC element is arranged downstream of...
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7382093 |
Device for operation of a discharge lamp of the short arc type
A device for operating a discharge lamp of the short arc type having a feed device which supplies a direct current to the discharge lamp when operation starts and an alternating current afterwards,...
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7372214 |
Apparatus and method for driving lamp of liquid crystal display device
A lamp driving apparatus of a liquid crystal display includes a plurality of lamps arranged with a predetermined distance between adjacent lamps; a comparator to compare output voltages of lamps...
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7352134 |
Lamp containing fixed reverse phase switching power supply with time-based phase pulse triggering control
A lamp contains a lamp voltage conversion circuit within the lamp and connected to a lamp terminal. The voltage conversion circuit includes a phase-control clipping circuit that clips a load...
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7348734 |
Method for protecting a ballast from an output ground-fault condition
A method ( 700 ) for protecting a ballast from an output ground-fault condition includes the steps of applying power to the ballast (step 710 ), providing a startup delay period for a DC-to-DC...
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7321206 |
LED driving apparatus
An apparatus for driving an LED is provided. The driving apparatus may have an LED unit including at least one LED, and a current controlling unit for controlling the magnitude of current flowing...
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7315130 |
Switching control for inverter startup and shutdown
An electronic ballast circuit for a lamp is described, wherein the ballast comprises a power factor correction circuit coupled to an inverter circuit. The inverter circuit is further coupled to a...
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7312588 |
Ballast with frequency-diagnostic lamp fault protection circuit
A ballast ( 20 ) for powering one or more gas discharge lamps ( 70,72,74,76 ) comprises an inverter ( 200 ) and a lamp fault protection circuit ( 400 ). Inverter ( 200 ) has an operating frequency...
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7288898 |
Automotive high intensity discharge lamp ballast circuit
An electronic ballast for driving a high intensity discharge (HID) lamp is provided. The electronic ballast includes a voltage boost stage for receiving a DC input voltage and outputting a boosted...
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7247996 |
Projector
The present invention is directed to decrease temperature rise in a power supply circuit in a standby mode by using existing signals and circuits while suppressing cost. In a power supply circuit...
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7245088 |
Power control circuit for controlling rated power supplied to a load
A power control circuit includes a power switch unit operable so as to enable and disable supply of an input voltage from an external power source to an LC circuit, a voltage detecting unit for...
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7242150 |
Dimmer having a power supply monitoring circuit
A two-wire dimmer for control of a lighting load from an alternating-current (AC) power source includes a semiconductor switch, a power supply, and a control circuit. The power supply includes an...
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7218062 |
Protective device and a CCFL driving system used thereon
A protective device and a CCFL driving system using the same are provided. The protective device employs a short detecting circuit to receive a high AC power at the high terminal of the CCFL...
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7208884 |
Discharge lamp lighting circuit with an open protection circuit
A discharge lamp lighting circuit includes an open protection circuit. The discharge lamp lighting circuit includes an open protection circuit and an over-voltage detecting circuit. The open...
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7208882 |
Lighting device for discharge lamp
A lighting device for high-pressure discharge lamp for lighting the high-pressure discharge lamp by lowering or raising a DC voltage applied to an input side by a DC/DC converter circuit, then...
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7170235 |
Circuit arrangement with a separate resonant igniter for a high-pressure discharge lamp
In a bridge circuit for operating a high pressure discharge lamp an additional switching element, a control circuit for driving the additional switching element, a resonant inductor and a resonant...
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7157862 |
Protection device for a chopping supply and a vehicle lighting device
The invention concerns a protection device for a chopping supply of the type comprising a voltage converter whose secondary is connected to a load such as a light source of the xenon lamp type, and...
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7154232 |
Ballast control IC with multi-function feedback sense
A multi-function feedback sense input in an electronic ballast control indicates a number of lamp faults on the basis of lamp parameters exceeding specified thresholds. An end of life detection is...
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7138769 |
Device for operation of a high pressure discharge lamp and a projector device
A device for operating a discharge lamp of the alternating current operating type has a high pressure discharge lamp with a silica glass discharge vessel in which a pair of opposed electrodes are...
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7126287 |
Lamp with integral voltage converter having phase-controlled dimming circuit with fuse-resistor network for reducing RMS load voltage
An incandescent lamp includes a lamp voltage conversion circuit within the lamp and connected to a lamp terminal, where the voltage conversion circuit converts a first line voltage at the lamp...
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7116084 |
Step-up converter having power factor correction
A step-up converter has a power factor correction, has an input for connection to a supply voltage, in particular a rectified AC voltage; an inductor, a diode and a storage capacitor, which are...
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