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Match Document Document Title
US20110101879 ELECTRONIC BALLAST CIRCUIT FOR LAMPS  
An electronic ballast circuit includes a power factor correction circuit, a control and amplifier circuit, a ballast controller circuit and a ballast driver circuit. The ballast driver circuit...
US20130200813 POST-MOUNTED LIGHT EMITTING DIODE (LED) DEVICE-BASED LAMP AND POWER SUPPLY FOR SAME  
A post mounted lamp includes: a lamp post; one or more light emitting diode (LED) devices disposed proximate to the top of the lamp post; a power factor (PF) correction circuit disposed proximate...
US20110109230 Ballast Circuit for LED-Based Lamp Including Power Factor Correction with Protective Isolation  
A ballast circuit for a light emitting diode (LED) based lamp including power factor correction with protective isolation. The circuit includes a transformer with electrically isolated windings...
US20110012526 POWER FACTOR CORRECTION AND DRIVER CIRCUITS  
Power factor correction and driver circuits and stages are described. More particularly, power factor correction circuits are described that utilize an auxiliary inductor winding for power...
US20120119669 Trailing Edge Dimmer Compatibility With Dimmer High Resistance Prediction  
In at least one embodiment, an electronic system includes a controller, and the controller provides compatibility between an electronic light source and a trailing edge dimmer. In at least one...
US20140361699 LED CONTROL CIRCUITS AND METHODS  
An LED controller is disclosed herein. An embodiment of the controller includes a first input connectable to a power source and an output connectable to at least one light-emitting diode (LED). A...
US20140077722 LED Lamp System  
Disclosed is an LED lamp system designed to fit into a fluorescent lamp fixture and to utilize a fluorescent lamp power supply contained in the fixture and receiving power from AC mains. The LED...
US20140077716 POWER SUPPLY DEVICE FOR LIGHTING AND LUMINAIRE  
In a power supply device 1, power factor improving circuits 15 and 16 are connected to an external power supply and configured to supply electric power to a driving circuit 19, improve a power...
US20130147387 Systems and Methods of LED Dimmer Compatibility  
Systems and methods of LED dimmer compatibility offer LED systems that fit in applications regardless of whether a dimmer is present or the type of dimmer switch that is used. These systems and...
US20150208492 END OF LIFE PROTECTION FOR VOLTAGE FED BALLAST  
An electric lighting device includes a voltage-fed inverter configured to receive a DC voltage and produce an AC lamp voltage. A lamp load is coupled to the AC lamp voltage and this lamp load...
US20130207567 BOOST CONVERTER ASSISTED VALLEY-FILL POWER FACTOR CORRECTION CIRCUIT  
A Light Emitting Diode (LED) lighting circuit has a passive valley-fill type power factor correction (PFC) circuit. A boost converter stage is coupled to the PFC circuit.
US20130141004 LED DRIVER PROTECTION CIRCUIT  
An illustrative LED driver circuit is based on a transition-mode power factor correction integrated circuit using flyback topology. The LED driver circuit features a universal input circuit having...
US20140009082 SYSTEMS AND METHODS FOR DETERMINING A TYPE OF TRANSFORMER TO WHICH A LOAD IS COUPLED  
An apparatus may include a controller to provide compatibility between a load and a secondary winding of a transformer driven at its primary winding by a dimmer, wherein the controller is...
US20150054421 METHOD FOR CONTROLLING A POWER FACTOR CORRECTION CIRCUIT, POWER FACTOR CORRECTION CIRCUIT AND OPERATING DEVICE FOR AN ILLUMINANT  
For the purpose of power factor correction, an inductance (21) is supplied with an input voltage (Vin), wherein a controllable switching means (24) that is coupled to the inductance (21) is...
US20090273297 POWER FACTOR CORRECTION AND DRIVER CIRCUITS  
Power factor correction and driver circuits and stages are described. More particularly, power factor correction circuits are described that utilize an auxiliary inductor winding for power...
US20080106216 DIMMING METHOD FOR LIGHT-EMITTING DIODES  
A dimming method for light emitting diodes (LEDs), which is applied in a pulse width modulation boost circuit system, includes the following steps: (a) equally dividing a cycle into a plurality of...
US20130300312 CONFIGURABLE LED DRIVER/DIMMER FOR SOLID STATE LIGHTING APPLICATIONS  
The disclosure is directed at a configurable light emitting diode (LED) driver/dimmer for controlling a set of light fixture loads comprising: a power circuit; a primary digital controller for...
US20100013397 POWER CONVERSION STRUCTURE  
A power conversion structure includes a power factor correction circuit which has an energy storage coil, a switch and a voltage boosting control unit. The voltage boosting control unit drives the...
US20050029962 Luminosity adjustable fluorescent lamp device for coordinated use with silicon controlled phase luminosity modulator  
Luminosity adjustable fluorescent lamp device available for coordinated use with silicon-controlled phase-luminosity modulator includes a fluorescent lamp (1) and an electric ballast (2), the...
US20080150447 ELECTRONIC BALLASTS  
Methods and apparatus are described that can provide improved power factor correction and total harmonic distortion, efficiency and/or direct feedback of load current variations to a power source...
US20090015173 Electronic ballasts without toroidal-magnetic-core and fluorescent lamps employ the same  
A toroid-free ballast comprising a filter and rectifier circuit (10) coupled with an AC power, a switch and resonant circuit (20) coupled with the filter and rectifier circuit (10), characterized...
US20090146575 Light Emitting Diode (LED) Driving Device  
A light emitting diode (LED) driving device includes a power factor correction (PFC) circuit, a bridge switch circuit, a resonant circuit, a transformer and a feedback circuit. The PFC circuit...
US20070108915 8-Pin PFC and ballast control IC  
The present invention relates to a fluorescent ballast control integrated circuit (IC) with power factor correction (PFC), and more particularly to a ballast control IC with a low pin count and...
US20080315783 ILLUMINATION LIGHT EMITTING ELEMENT AND ILLUMINATION DEVICE PROVIDED THEREWITH  
An illumination light emitting element driving circuit includes a power factor improving circuit (2). The power factor improving circuit (2), when a load (illumination light emitting diode 17) of...
US20150022113 POWER FACTOR CONTROLLER BASED SINGLE-STAGE FLYBACK DRIVER AND LIGHT-EMITTING SYSTEM  
Various embodiments relate to a power factor controller based single-stage flyback driver and a light-emitting system. The driver includes a primary-side circuit, a secondary-side circuit, a power...
US20100194287 ELECTRONIC BALLAST FOR A HIGH INTENSITY DISCHARGE LAMP  
An electronic ballast for an HID lamp is described, comprising: a rectifier circuit; a PFC power factor correction circuit increasing the direct current (DC) voltage coming out from the rectifier...
US20120161664 DRIVING CIRCUIT AND LIGHTING EQUIPMENT USING THE SAME  
A driving circuit and lighting equipment using the same are provided. The driving circuit includes a first power receiving terminal, a second power receiving terminal and a power conversion unit....
US20070194721 Electronic lighting ballast with multiple outputs to drive electric discharge lamps of different wattage  
A number of elements are integrated within an electronics enclosure. A non-inverting buck-boost converter is to operate in the continuous conduction mode designed to provide an average power of...
US20100117545 Solid State Lighting, Driver Circuits, and Related Software  
LED lighting fixtures, or luminaires, related components, driver circuit, methods, and software/firmware are described can provide for among other things, ambient environment sensing, thermal...
US20130193868 INDEPENDENTLY ADJUSTABLE CURRENT AND VOLTAGE AC-AC CONVERTER  
The present disclosure is directed to an alternating current (AC) to AC converter circuit for independently adjusting a current and voltage to adjust a light output of a light operating on AC...
US20150216007 CONTROL CIRCUIT FOR REDUCING OF TOTAL HARMONIC DISTORTION (THD) IN THE POWER SUPPLY TO AN ELECTRIC LOAD  
A control circuit for reducing Total Harmonic Distortion (THD) in the power supply to an electric load, includes an input stage (10) for receiving a network voltage (V1) and providing a...
US20090322238 Internal Power Supply for a Ballast  
A ballast used with an input power source for energizing a lamp. The ballast includes a power stage, a controller, an internal power supply for the power stage and the controller, and an input...
US20140346962 SWITCHED-CAPACITOR ISOLATED LED DRIVER  
A switched-capacitor voltage converter which is particularly well-suited for receiving a line voltage from which to drive current through a series of light emitting diodes (LEDs). Input voltage is...
US20100244721 MODULAR PROGRAMMABLE LIGHTING BALLAST  
A lighting ballast is programmable as to input and output parameters. Both operational characteristics and sensed data are used to control the ballast parameters. The ballast is configured to...
US20140035474 HIGH EFFICIENCY LED DRIVER CHIP AND DRIVER CIRCUIT THEREOF  
Disclosed is a high-efficiency LED driver chip and a driver circuit of the chip, and the driver chip includes a detection unit, a comparison unit and a correction unit. The LED detection unit...
US20090231552 Lighting System and Method for Operating a Lighting System  
A lighting system comprising a first light source, which is adapted to generate light signals of a first color, and at least one second light source, which is adapted to generate light signals of...
US20130169185 ELECTRONIC BALLAST FOR LIGHTING UNIT AND LIGHTING APPARATUS  
An electronic ballast for a lighting unit may include: a Power Factor Correction (PFC) circuit, an inverter, and a control circuit for controlling startup of the inverter, wherein the control...
US20080224629 LIGHTING SYSTEM WITH POWER FACTOR CORRECTION CONTROL DATA DETERMINED FROM A PHASE MODULATED SIGNAL  
A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase...
US20080218663 FLUORESCENT TUBE DRIVING METHOD AND APPARATUS  
A fluorescent tube driving method for driving a fluorescent tube on the basis of an alternating current driving signal generated by an inverter circuit that uses a direct current power supply...
US20070108916 LED driving circuit and controlling method thereof  
The invention discloses an LED driving circuit and a controlling method thereof, comprising a power switch and a current sampling unit, as well as a voltage comparison unit for comparing the...
US20070267978 Digitally controlled current regulator for high power solid state lighting  
An exemplary apparatus embodiment provides for controlling current supplied to solid state lighting, such as light emitting diodes. An exemplary apparatus comprises a memory adapted to store a...
US20080218097 Emulation Circuit  
An emulation circuit is disclosed for connection to a low energy lamp energised by an AC supply and substituted for an incandescent lamp in a traffic signal installation. The circuit comprises...
US20100225240 Multi-Stage Power Supply For a Load Control Device Having a Low-Power Mode  
A multi-stage power supply for a load control device is able to operate in a low-power mode in which the power supply has a decreased power consumption when an electrical load controlled by the...
US20070152604 Low-voltage power supply circuit for illumination, illumination device, and low-voltage power supply output method for illumination  
In a low-voltage power supply circuit for illumination that rectifies an ac power supply by means of a rectifier circuit, that controls this rectified output by means of a power-factor control...
US20150237702 CONTROL LOOP WITH A VARIABLE TIME CONSTANT FOR POWER FACTOR CORRECTION FOR A LOAD CIRCUIT COMPRISING LIGHT-EMITTING MEANS  
The invention proposes a method for operating an actively clocked PFC circuit (2) having a directly or indirectly connected load circuit (5) at the output of the PFC circuit (2), wherein the load...
US20130015779 HIGH INTENSITY DISCHARGE BALLAST CONFIGURED TO ACCOMMODATE WIDE RANGE OF INPUT AND OUTPUT CHARACTERISTICS  
A ballast includes a power supply subsystem, a power factor correction circuit, a control subsystem and a half bridge. The power supply subsystem can receive an input line voltage that is within a...
US20100102742 Electronic ballast  
Provided is an electronic ballast including: a rectifier which rectifies alternating current (AC) power into direct current (DC) power; a power factor compensator which improves a power face of...
US20050242751 Inverter circuit with a power factor corrector  
The present invention provides an inverter circuit with a power factor corrector. A power source provides a power signal of alternating current. An electromagnetic interference filtering unit and...
US20060175980 Lamp with built-in voltage converter including a bidirectional thyristor diode (SIDAC)  
A lamp includes a voltage conversion circuit that converts a line voltage at a lamp terminal to a load voltage usable by a light emitting element of the lamp. The voltage conversion circuit is...
US20140042926 Power Control System for Current Regulated Light Sources  
A light emitting diode (LED) lighting system includes a PFC and output voltage controller and a LED lighting power system. The controller advantageously operates from an auxiliary voltage less...

Matches 1 - 50 out of 73 1 2 >