Class / Patent application number | Description | Number of patent applications / Date published |
315125000 | Shunt circuit closing | 23 |
20100194285 | LIGHT SOURCE DRIVING APPARATUS AND LIGHT SOURCE APPARATUS HAVING THE SAME - A light source driving apparatus includes; a boosting part which boosts an input voltage received from an input part and generates a driving voltage, a boosting transistor which controls an operation of the boosting part, a rectification part connected between the boosting part and an output part and which transmits the driving voltage to the output part, an integrated circuit which generates a gate signal which controls the boosting transistor, and a protection circuit which generates a protection signal which controls a voltage level of the gate signal according to an output current of the boosting transistor. | 08-05-2010 |
20110148306 | BYPASS PROTECTION CIRCUIT AND LIGHT EMITTING DIODE DRIVING DEVICE USING THE SAME - A bypass protection circuit connected to a light emitting diode (LED) group in parallel, comprises a switch circuit and a capacitor. The switch circuit comprises a plurality of switch components, an abnormal detection module and a switch control module. The abnormal detection module detects voltage of the LEDs respectively, and determines which one is broken and outputs an abnormal signal. The switch control module controls a switch component connected to the broken LED in parallel on/off according to the abnormal signal. The capacitor is charged by driving signals of the LEDs when the LEDs are operated according to a normal working mode or a first status of a burst dimming mode, and is discharged to maintain an operating power of the switch circuit when the LEDs are operated according to a second status of the burst dimming mode. | 06-23-2011 |
20110163676 | Current Limiting Shut-Off Circuit for LED Lighting - A current limiting recessed lighting fixture prevents operation with lamps exceeding a rated wattage. Laws coming into effect place limits on lamp power consumption. The laws require that light fixtures include features to prevent a compliant lamp being later replaced by a higher wattage lamp. Further, limits have been placed on air flow from recessed lighting fixtures into ceiling plenums resulting in retention of heat in fixtures. Most high efficiency lamps include heat producing circuits in the lamp base and recessed lighting fixtures suitable of a lower wattage high efficiency lamp may overheat if a higher wattage replacement lamp is installed. Such overheating may drastically shorten the life if expensive LED lamps. The current limiting recessed lighting fixture shuts off when a lamp is installed which draws current above the rating for the fixture thereby addressing both the requirements of the new laws and also the potential overheating. | 07-07-2011 |
20110304271 | Light-emitting diode (LED) protection structure - A light-emitting diode (LED) protection structure includes an LED portion and a protection portion. The protection portion includes a fuse and a Zener diode connected in series. The protection portion is electrically connected to the LED portion in parallel but opposite in direction. As such, the LED protection structure can effectively protect the LEDs and the Zener diode from being damaged to thereby reduce costs. | 12-15-2011 |
20120068606 | CURRENT LIMITING CIRCUIT, AN LED MODULE AND AN LED ILLUMINATING DEVICE - A current limiting circuit includes a power input terminal that is connected to an output terminal of a direct current power source to which an output capacitor is connected in parallel; a power output terminal to which an LED is connected; and a current limiting unit that supplies to the LED a load current to which an upper current value is set, supplies to the LED a load current lower than the upper current value at a normal condition, and supplies to the LED a load current higher than the load current of the normal condition and equal to or lower than the upper current value at an abnormal condition. | 03-22-2012 |
20120074847 | Method And Apparatus For Controlling An Electronic Circuit Node Coupled To A Single Conductor Line - Light Emitting Diodes (LEDs) are increasingly used in illumination applications. To control multiple Light Emitting Diodes (LEDs), or any other controllable light source, this document introduces a single-wire multiple-LED power and control system. Specifically, individually controlled LED units are arranged in a series configuration that is driven by a control unit located at the head of the series. Each of the individually controlled LED units may comprise more than one LED that is also individually controllable. The head-end control unit provides both electrical power and control signals down a single wire to drive all of the LED units in the series in a manner that allows each LED unit to be controlled individually or in assigned groups. | 03-29-2012 |
20120187847 | LED DRIVER WITH END-OF-LIFE DETECTION CIRCUITRY - An LED lighting device includes a DC/DC power converter having output terminals coupled to respective lamp sockets. A controller receives signals from a current sensor and a voltage sensor, and controls the DC/DC power converter to increase/decrease an output voltage based on a sensed output current with respect to a target value. A sensed output voltage is compared to predetermined upper and lower limit values, and the DC/DC power converter is disabled when the output voltage exceeds the predetermined upper limit value or falls below the predetermined lower limit. The controller further measures an accumulated lighting time of the device, and after the accumulated lighting time has exceeded a predetermined switching time, decreases the upper limit value monotonously or in increments as the accumulated lighting time passes. | 07-26-2012 |
20120194079 | METHOD AND APPARATUS FOR CONTROLLING DIMMING LEVELS OF LEDS - Circuits useful in achieving efficient current control of LEDs based on a dimming control input are described. The circuits use a combination of PWM dimming and analog dimming to achieve a highly efficient LED driver over a wide range of dimming from near 0% to 100% light output. | 08-02-2012 |
20120212139 | Smart clamp - In a circuit that turns off a fluorescent lamp, clamping circuitry is provided to dissipate energy stored in a ballast when the lamp is being turned off. In a normal state in which the lamp is on, or in a normal state in which the lamp is off, clamping is not performed as long the VDS of a power switch is below a voltage A. In a lamp turn off operation, the switch is turned on for a time period to extinguish the lamp, and is then made to operate as a clamp (operate in its linear region) for a second period of time to dissipate energy that was stored in the ballast. Clamping in the linear region continues for VDS voltages down to B as ballast energy is dissipated, where B is smaller than A. By clamping down to the lower voltage B, re-ignition of the lamp is prevented. | 08-23-2012 |
20130009547 | LED DRIVING CIRCUIT WITH OPEN-CIRCUIT PROTECTION - An LED driving circuit with open-circuit protection is disclosed. The LED driving circuit pulls down an operation voltage supplied to a converting controller of the LED driving circuit when a voltage across an LED module of the LED driving circuit is too high, so as to stop the converting controller operating and further latch the converting controller at the protection state until that the converting controller is restarted or the condition of the voltage supplied to the LED module being too high is solved. | 01-10-2013 |
20130033181 | LAMP ASSEMBLY AND CIRCUITS FOR PROTECTION AGAINST MISWIRING IN A LAMP CONTROLLER - An electronic circuit for use with a lamp controller includes a driver component and a voltage interface circuit powered by the driver component. The interface component delivers a low voltage power signal at a defined operating range via output lines to a downstream controller. A protection circuit is coupled with the voltage interface circuit. The protection circuit in one embodiment has an under-voltage switch disposed in one of the output lines and configured to open at a voltage less than the defined voltage range, and a blocking device disposed in the other output line and configured to block reverse power flow at a voltage above the defined voltage range. In another embodiment, the protection circuit has a first blocking device disposed in either one of the output lines to block reverse power flow to the voltage interface circuit, a PTC device disposed in either one of the output lines, and a second blocking device disposed across the output lines to protect the control circuit from a high voltage reverse polarity condition. | 02-07-2013 |
20130119869 | SYSTEM AND METHOD FOR SUPPLYING CONSTANT POWER TO LUMINUOUS LOADS WITH POWER FACTOR CORRECTION - An apparatus is disclosed for supplying power to a luminous load. The apparatus includes a transformer having a primary winding, and a control circuit adapted to generate an alternating current through the primary winding to develop an alternating voltage. The alternating current is based on a first signal derived from the input voltage, a second signal derived from the current, and a third signal varying substantially in-phase with the input voltage. The first and second signals are used to regulate the power delivered to the load, and the third signal is used to improve the power factor. A load interface circuit is provided to generate an output voltage for the luminous load based on the alternating voltage from the transformer. An over-temperature sensor may be provided to cause a reduction in power to the load when the ambient temperature exceeds a threshold. | 05-16-2013 |
20130307417 | HIGH POWER DIRECT DRIVE CIRCUIT - A driver circuit for driving an LED includes a rectifier circuit to receive AC voltage and to convert the AC voltage to DC voltage. The driver circuit further includes a filter circuit for filtering the DC voltage. The driver circuit further includes a detection circuit for determining a change in the filtered DC voltage over a predetermined time interval. The driver circuit further includes a dampening circuit for dampening the filtered DC voltage responsive to the detection circuit determining that the change in filtered DC voltage over the predetermined time interval exceeds a predetermined threshold. | 11-21-2013 |
20140042908 | Connector with Surge Protection Structure - A connector ( | 02-13-2014 |
20140252957 | DISPLAY APPARATUS AND CONTROL METHOD FOR DISPLAY APPARATUS - A display apparatus is provided which optimally restores decreased luminance and extends a life of a light emitting element. The display apparatus includes a memory that stores a plurality of trap levels in association with a plurality of use durations of the light emitting element. An obtainer determines one of the plurality of use durations of the light emitting element. A controller reads, from the memory, one of the plurality of trap levels associated with the one of the plurality of use durations, and removes a charge from the light emitting element by application of a reverse bias voltage having a level associated with the one of the plurality of trap levels. The controller changes the level of the reverse bias voltage which is applied to the light emitting element so that as the one of the plurality of use durations increases, the level of the reverse bias voltage increases. | 09-11-2014 |
20150091444 | PANEL FOR DISPLAY DEVICE, DISPLAY DEVICE, AND METHOD FOR TESTING PANEL FOR DISPLAY DEVICE - A panel for a display device includes a display unit, an electrostatic protection wire, a wire being connected to the display pixels, an electrostatic protection circuit, and an electrostatic protection circuit control line. The display unit includes a plurality of display pixels. The electrostatic protection wire is connected to a test pad, the test pad being provided to receive a test signal. The electrostatic protection circuit connects the electrostatic protection wire and the wire connected to the display pixels. The electrostatic protection circuit includes a back-gate-type transistor that has a gate electrode, a drain electrode being short-circuited with the gate electrode, and a back-gate electrode. The electrostatic protection circuit control line includes a first end and a second end, the first end being connected to the back-gate electrode of the back-gate-type transistor. | 04-02-2015 |
20160095179 | APPARATUS FOR DRIVING LIGHT EMITTING DIODE - The present invention relates to an apparatus for driving a light emitting diode. The apparatus for driving the light emitting diode according to the present invention comprises a rectifier circuit for accessing an Alternating Current (AC) voltage source to rectify an AC voltage of the AC voltage source, a light emitting diode array connected to an output side of the rectifier circuit and including a plurality of light emitting diode array blocks, and a charging/discharging circuit configured to be charged by a voltage output from the rectifier circuit, wherein the apparatus for driving the light emitting diode comprises a discharging switch, a block switch circuit, and a controller. The apparatus for driving the light emitting diode according to the present invention can apply a voltage equal to or larger than a driving voltage to intervals around a phase of 180 degrees in which the light emitting diode cannot be driven since a size of the voltage applied by the AC voltage source is smaller than or equal to the driving voltage, by using the charging/discharging circuit and the switch. | 03-31-2016 |
20160174329 | LED RETROFIT LAMP HAVING ACTIVE OVER-CURRENT PROTECTION CIRCUIT | 06-16-2016 |
20160204600 | OVERVOLTAGE PROTECTION APPARATUS AND LUMINAIRE HAVING SUCH AN OVERVOLTAGE PROTECTION APPARATUS | 07-14-2016 |
315126000 | With compensating impedance | 4 |
20120112639 | Controlled Power Dissipation In A Link Path In A Lighting System - In at least one embodiment, a lighting system includes a link path power dissipation circuit to actively and selectively control power dissipation of excess energy in a switching power converter of the lighting system. The link path power dissipation circuit dissipates power through a link path of the switching power converter by controlling a link current of the switching power converter. In at least one embodiment, the controller controls the link path power dissipation circuit to limit the link current with a current source and dissipate power in the current source. In at least one embodiment, the link path power dissipation circuit includes a switch to limit the link current and dissipate power in the link path. | 05-10-2012 |
20120119652 | METHOD OF CONTROLLING AN ELECTRONIC BALLAST, AN ELECTRONIC BALLAST AND A LIGHTING CONTROLLER - A method of controlling an electronic ballast for a lighting circuit, the ballast including a bleeder, for use with dimmer circuits, by, in response to a mains supply being connected to the lighting circuit, determining whether a dimmer circuit is present in the lighting circuit; and in response to determining a dimmer circuit is not present, disconnecting the bleeder from the lighting circuit at least until the mains supply is disconnected. The method may be used during, and the determination of whether a dimmer circuit is present is stored at least until the mains supply is disconnected. Determination of either a leading or trailing edge phase cut dimmer may be made by looking for deviation from the expected sine-wave voltage, either directly through temporal or voltage deviation, or indirectly by examining the second differential of the voltage with respect to time. | 05-17-2012 |
20120139422 | DRIVING CIRCUIT FOR POWERING LED LIGHT SOURCES - Embodiments of the invention provided a driving circuit for powering a light-emitting diode (LED) light source. The driving circuit includes a rectifier, a s filter capacitor, and a control circuit. The rectifier converts an AC voltage from an AC power source to a rectified AC voltage. The filter capacitor coupled to the rectifier filters the rectified AC voltage to provide a DC voltage. The control circuit controls power supplied to the LED light source. The control circuit enables a discharging current periodically to discharge the filter capacitor if a switch coupled between an AC power source and a rectifier is turned off and disables the discharging current if the control circuit determines that the switch is turned on. | 06-07-2012 |
20130043792 | ELECTROSTATIC DISCHARGE PROTECTION FOR LUMINAIRE - An apparatus for protecting a solid state retrofit lighting or illumination system from electrostatic discharge damage caused by charge induced onto conductive surfaces of the lighting or illumination system. | 02-21-2013 |