Matches 1 - 50 out of 251 1 2 3 4 5 6 >


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US20110309761 LAMP TUBE WITH DETACHABLE POWER RECTIFIER MEMBER  
A lamp tube includes a encapsulation and a power rectifier member. The power rectifier member includes a power rectifier to convert alternating current (AC) energy into direct current (DC) energy....
US20150145429 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...
US20120229043 ELECTRICAL CONNECTOR FOR CONNECTING A LIGHT EMITTING DIODE (LED) TO A DRIVER  
An electrical connector is provided for connecting a light emitting diode (LED) to a driver. The electrical connector includes a housing, a driver input contact held by the housing and configured...
US20130307430 CONTROL CIRCUIT FOR A PHASE-CUT DIMMER AND A METHOD OF CONTROLLING A PHASE-CUT DIMMER  
A control circuit is disclosed for lighting applications having a load and an AC leading-edge phase-cut dimmer comprising a phase-cutting switch, the circuit comprising: a detection circuit for...
US20140217911 CIRCUIT AND METHOD FOR FLICKER SUPPRESSION IN LIGHT EMITTING DIODES (LEDS)  
A circuit for flicker suppression in a Light Emitting Diode (LED) has a latch. The latch has a first state set with a trailing edge of Pulse Width Modulated Dimming (PWMD) pulse, and a second...
US20110109236 Periodic lighting device  
There is presented a detailed electronic method for simulation of a firefly, other insects, or organisms producing bioluminescence and with light radiation functions similar to a real firefly,...
US20110260634 ELECTRONIC BALLAST CIRCUIT FOR FLUORESCENT LAMPS  
Disclosed is a single switch integrated electronic ballast circuit for a fluorescent lamp, comprising an input for receiving a rectified DC voltage; a power factor correction portion for shaping...
US20110169411 LED LIGHTING DEVICE AND HEAD LAMP LED LIGHTING DEVICE  
When a current which is conducted from a direct current power supply 8 to a choke coil L1 after a switching transistor 7 is turned on has a predetermined value, an LED lighting device lights up an...
US20120081019 Fluorescent lamp circuit capable of being repaired and repeatedly used  
The present invention is to provide a fluorescent lamp circuit capable of being easily repaired and repeatedly used even when one of filaments in a fluorescent light tube breaks because of age or...
US20110215728 CONSTANT POWER LED CIRCUIT  
A constant power drive for light emitting diodes, such that there is automatic compensation for variation in forward voltage of the LED, both in a single unit with temperature, and also due to...
US20120133294 LIGHT DIMMER AND METHOD  
A method for controlling an output of a AC current fluorescent lamp, including the steps of predetermining a desired degree of lamp illumination, determining the zero crossing point of a waveform...
US20110006695 Device and Method for Generating an Ignition Voltage for a Lamp  
A device for generating an igniting voltage for a lamp, comprising: a first resonant circuit that is connected to the lamp via a switch; and a second resonant circuit connected upstream of said...
US20110037398 Circuit Arrangement and Method for Starting a Discharge Lamp  
A circuit arrangement for starting a discharge lamp, with a primary circuit, which comprises a series circuit comprising an inductance (L), a starting capacitor (C1) and a first switch (SG), the...
US20080048577 Projector HID lam ballast having LLC resonant converter  
A ballast for a projector high-intensity discharge (HID) lamp includes an electrical connector and an inductor-inductor-capacitor (LLC) resonant converter. The electrical connector is receptive to...
US20140055061 Battery Powered Control Device For Driving A Load With A Pulse Width Modulated Signal  
A battery-powered load control device (e.g., a motorized window treatment) is able to supply a pulse-width modulated current to an electrical load (e.g., a motor) while conducting a substantially...
US20150102743 Multi-Mode Portable Lighting Device  
A portable lighting device, such as a flashlight, with a mechanical power switch and multiple operating modes is provided. The mechanical power switch is disposed in series with the controller for...
US20070210724 Power adapter and DC-DC converter having acoustic transformer  
An integrated power adapter, a portable electronic device with an integrated power adapter, and multichip modules are described.
US20120194091 USER CONTROL OF AN LED LUMINAIRE FOR A PHASE CUT DIMMER  
A phase cut angle converter with range detection for a phase cut dimmer constituted of: a phase cut angle detector arranged to detect the phase cut angle presented by the phase cut dimmer blocking...
US20150054418 Multi-Mode Dimmer Interfacing Including Attach State Control  
A system and method includes a controller that is configured to coordinate (i) a low impedance path for a dimmer current, (ii) attaching a dimmer to a power converter system at the leading edge of...
US20090289559 LED DEVICE AND LED DRIVER  
A LED device having a LED array, LED driver ICs, DC-DC converter, a first feedback circuit consisting of voltage dividing resistors, and a headroom voltage monitoring circuit having controller and...
US20060232219 Single driver for multiple light emitting diodes  
A LED driver circuit (70, 80) employs a power source (IS, VS) for providing power at a power conversion frequency to a switching LED cell (30-32, 40-42). The switching LED cell (30-32, 40-42)...
US20150091454 System for Controlling LED Light Strings  
An enhanced control mechanism for an LED light string system is provided for switching between one of two DC output phases or polarities so as to actuate one or the other of two LEDs within the...
US20150069926 LED CONTROLLERS FOR DIMMING AT LEAST ONE LED STRING  
Disclosed are LED controllers for dimming. An LED controller includes a current driver, a pulse-width modulator, a feedback circuit, and a decoupling circuit. The current driver, selectively in...
US20070182340 Fluorescent tube electronic rectifier  
The present invention is to provide a fluorescent tube electronic rectifier which comprises an inverter circuit and an inductance rectifier wherein the inverter circuit has an output end to be...
US20140175998 LAMP DRIVING APPARATUS AND ILLUMINATION EQUIPMENT USING THE SAME  
A lamp driving apparatus and an illumination equipment using the same are provided. The provided lamp driving apparatus is responsible for driving a lamp. When any one of two terminals of the lamp...
US20130002146 LAMP ARRANGEMENT  
In various embodiments, a lamp arrangement with a lamp including a base which is able to be inserted into a socket for establishing contact with the lamp, wherein the lamp arrangement has at least...
US20110285303 DIMMER CONTROL CIRCUIT FOR SELECTING BETWEEN STEP DIMMING MODE AND PHASE-CUT DIMMING MODE  
The present invention relates to a dimmer control circuit (100) capable to detect whether a phase-cut dimmer is connected using an average signal (VDCI) derived from the mains voltage. The average...
US20120161655 BALLAST WITH ANTI-STRIATION CIRCUIT  
A ballast including an inverter circuit for providing an oscillating power signal for energizing at least one lamp. The inverter circuit includes a first transistor having a first gain and a...
US20110193488 LED DRIVE CIRCUIT, DIMMING DEVICE, LED ILLUMINATION FIXTURE, LED ILLUMINATION DEVICE, AND LED ILLUMINATION SYSTEM  
An LED drive circuit in which an alternating voltage from a phase control dimmer is input and an LED is driven. The LED drive circuit comprises a phase angle detector for detecting the phase angle...
US20090236997 LED control circuit and method, and insect resistive LED lamp  
A LED control circuit and method generate a high frequency clock signal with a fixed duty for a LED driver, to supply a switching current to drive a LED to emit light flashing at a modulated high...
US20100090607 DIMMER AND ILLUMINATION APPARATUS WITH AMPLITUDE ORDERED ILLUMINATION OF MULTIPLE STRINGS OF MULTIPLE COLOR LIGHT EMITTING DEVICES  
A dimmer and an illumination apparatus are connected by a two wire circuit. The dimmer energizes the illumination apparatus and provides control of the illumination apparatus via the two wire...
US20110210680 HIGH-PRESSURE DISCHARGE LAMP LIGHTING DEVICE, HIGH PRESSURE DISCHARGE LAMP APPARATUS USING THIS, PROJECTOR USING THE HIGH-PRESSURE DISCHARGE LAMP APPARATUS, AND HIGH-PRESSURE DISCHARGE LAMP LIGHTING METHOD  
The high-pressure discharge lamp lighting device and a high-pressure discharge lamp apparatus using this of the present invention are able to suppress the excessive drop in the lamp voltage in a...
US20090278465 POWER CONVERSION UNIT FOR LED LIGHTING  
A power conversion unit converts an AC voltage into substantially constant DC current. The power conversion unit can be placed into an end cap of an LED lighting unit, to power LED modules. The...
US20140217913 LED DRIVER  
A LED driver system (1) comprises a current source (4) which supplies a power supply current (i) to a parallel arrangement of a parallel switch (20) and a LED (10). The parallel switch (20)...
US20150108913 LOAD CONTROL DEVICE FOR HIGH-EFFICIENCY LOADS  
A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load)...
US20150091467 LOAD CONTROL DEVICE FOR HIGH-EFFICIENCY LOADS  
A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load)...
US20100019889 DEVICE THAT ENABLES PLC BASED SMART DIMMERS TO FUNCTION WITH NO NEW WIRES  
A device that enables “smart” dimmers comprising electronic circuits beyond those found in traditional rotary dimmers to be installed in existing houses with no need for any new electrical wires....
US20060267511 Start-Up Supervision Circuit  
An arrangement and a method in an integrated circuit include a start signal generating circuit provided to generate a start signal, when a supply voltage has reached a stable operating voltage...
US20150028763 MODULATION OF LIGHT EMITTED BY A LIGHTING DEVICE, USING PLURALITY OF DIFFERENT MODULATION PERIODS  
The possibility to emit and detect coded light, whereby data is modulated into the light, is known. According to one aspect of the present disclosure, to reduce the risk of the modulation going...
US20140111109 HIGH PRESSURE DISCHARGE LAMP LIGHTING DEVICE, PROJECTOR PROVIDED WITH THE SAME, AND HIGH PRESSURE DISCHARGE LAMP LIGHTING METHOD  
A calculation processing sub-unit 11 controls a frequency control sub-unit 13 and a DC-AC inverter circuit 6 to repeat an A-period and a B-period. The A-period continues for at least two cycles,...
US20080191634 Lamp driving circuit, inverter board and display apparatus having the same  
A lamp driving circuit, an inverter board and a display apparatus having the inverter board, the lamp driving circuit receiving a direct current voltage and provides the direct current voltage to...
US20120001561 DIMMER-DISABLED LED DRIVER  
A controller for use in a light emitting diode (LED) driver is disclosed. An example controller includes an input circuit coupled to receive an ac input signal from an ac source. A dimmer disabler...
US20090302773 Electronic reactive current oscillation-reducing ballast  
An electronic ballast presenting an input capacitor (C) and including a step-up converter (LH, DH, SH, CH) for operating a load, for example a discharge lamp (CFL), on a phase control dimmer (DIM)...
US20120098449 ILLUMINATION DEVICE  
An illumination device includes an organic EL panel having a light emission layer provided between a first electrode and a second electrode, a power source, a power switcher, a control circuit,...
US20070126367 Startup circuit and backlight control circuit using same  
A backlight control circuit (300) used in a liquid crystal display includes a startup circuit (330), and a pulse width modulation integrated circuit (320). The startup circuit includes a charging...
US20140062329 DISPLAY BACKLIGHT MODULATION  
An apparatus may include a backlight for illuminating a liquid crystal display and a control module for controlling the illumination of the backlight. The control module may alternate between...
US20120074858 HIGH-PRESSURE DISCHARGE LAMP LIGHT-UP DEVICE, HIGH-PRESSURE DISCHARGE LAMP APPARATUS USING SAME, PROJECTOR USING HIGH-PRESSURE DISCHARGE LAMP APPARATUS, AND LIGHT-UP METHOD FOR HIGH-PRESSURE DISCHARGE LAMP  
A high-pressure discharge lamp lighting device that suppresses deterioration and the expansion of inter-electrode distance in a pair of electrodes within a high-pressure discharge lamp, more...
US20140139130 Synchronized Light Source For Rolling Shutter Imagers  
A lighting system adapted for use with a rolling shutter imagers. The system uniquely provides PWM-control of a light source in the context of an imager with a “rolling-shutter”-type exposure...
US20090273292 OPERATING CIRCUIT FOR LIGHT-EMITTING DIODES  
An operating circuit for at least one light-emitting diode (LED) incorporates a switched-mode regulator circuit to which a DC voltage is fed and which provides a supply voltage for the at least...
US20140354168 POWER SUPPLY AND METHOD FOR CONTROLLING THE SAME  
A power supply includes an inputter including an input capacitor and configured to receive an input DC voltage, a converter including an output capacitor and configured to convert the input DC...

Matches 1 - 50 out of 251 1 2 3 4 5 6 >