| Entries |
| Document | Title | Date |
|---|
| 20080211418 | Inverter circuit with single sampling unit and liquid crystal display with same - An exemplary inverter circuit ( | 09-04-2008 |
| 20080265790 | COUPLED LAMP DRIVING DEVICE - A coupled lamp driving device is described, comprising an alternating current (AC) power supply providing a sine-wave to two ends of each of a plurality of coupled transformers each having a primary side connected to each other at a primary side thereof and a secondary side; the plurality of coupled transformers connected to each other at the primary side thereof directing the sine-wave signal from the AC power supply to the two sides of the primary side of each of the coupled transformers and connected to an end of one of a plurality of lamps at one end of the secondary side thereof and connected to a reference level at the other end thereof, and the plurality of lamps each having the other end connected to a reference level. Since the primary sides of the coupled transformers are connected in series, a current flown on the primary side of each of the coupled transformers is equal to each other, respectively. Further, since the numbers of coils of the primary and secondary sides, respectively, are equal to each other, currents flown on the secondary side of each of the coupled transformers are also the same. Therefore, the luminance of each of the plurality of lamps can be maintained uniformly. | 10-30-2008 |
| 20080315780 | LIGHT EMITTING DIODE DRIVING DEVICE - There is provided an integrated LED driving device including: a DC/DC converting part converting and outputting a DC voltage inputted from the outside by switching of a switch into a driving voltage of a magnitude suitable for driving a plurality of LED arrays; a constant current controlling part receiving at least one of information on the current flowing through the LED array and information on a voltage applied to the LED array by feed-back, the constant current controlling part including a PWM controller PWM-controlling a switching duty of the switch of the DC/DC converting part, and controlling a switching duty of each of the switches of the switching part to allow the current to flow through the LED array with a predetermined magnitude; and a control logic receiving a control signal by a user and controlling the PWM controller in response to the control signal. | 12-25-2008 |
| 20090115339 | Apparatus and Method for Controlling Driving of Lamp - Disclosed are an apparatus and a method for controlling driving of a lamp. The apparatus for controlling driving of a lamp includes a plurality of lamps, a switching module for switching supplied power to output an alternating current (AC) signal, a trans-module for converting the alternating signal into high-voltage signals having different phases to supply the high-voltage signals to the lamps, an open lamp detecting module for adding low-voltage signals having different phases feedback from the trans-module to detect open states of the lamps, and a controller for controlling an operation of the switching module by a signal detected in the open lamp detecting module. | 05-07-2009 |
| 20090284163 | METHOD AND APPARATUS FOR DRIVING MULTIPLE PARALLEL DISCHARGE LAMPS - The present invention provides a method and apparatus for driving multiple parallel discharge lamps, which increases the switching frequency once the open lamp condition is detected to provide an output voltage that is high enough to ignite the lamp again. | 11-19-2009 |
| 20100026196 | DISCHARGE TUBE DRIVING DEVICE - This invention provides a discharge tube driving device which drives a plurality of discharge tubes using less driving transformers. The discharge tube driving device includes a switching circuit which is controlled by a switching pulse and generates a driving pulse, a driving transformer which has a primary winding for receiving the driving pulse and a secondary winding for generating a high-frequency driving signal, a first discharge tube group including a plurality of discharge tubes, and a second discharge tube group including a plurality of discharge tubes. One-side terminals of the plurality of discharge tubes in the first discharge tube group are connected to the positive high-voltage terminal of the secondary winding of the driving transformer. One-side terminals of the plurality of discharge tubes in the second discharge tube group are connected to the negative high-voltage terminal of the secondary winding of the driving transformer. Another-side terminals of the plurality of discharge tubes in the first discharge tube group are respectively connected to another-side terminals of the plurality of discharge tubes in the second discharge tube group. | 02-04-2010 |
| 20100033100 | BACKLIGHT MODULE CONTROL SYSTEM AND CONTROL METHOD THEREOF - A backlight module control system includes at least one backlight module, a driving circuit, at least one switch and a power supply module. The driving circuit is utilized for determining a driving signal to drive the backlight module. The switch is coupled between the driving circuit and the backlight module, and is selectively turned on or off according to the driving signal. The power supply module is coupled to the backlight module, and is utilized for providing an operating voltage required by the backlight module control system. | 02-11-2010 |
| 20100052554 | Cell Arrangement for Feeding Electrical Loads such as Light Sources, Corresponding Circuit and Design Method - A circuit arrangement for driving electrical loads such as High Flux (HF) LEDs used as lighting sources. The circuit arrangement includes: a switched power source ( | 03-04-2010 |
| 20100052555 | POWER SUPPLY SYSTEM, LAMP SYSTEM AND METHOD OF CONTROLLING LIGHT INTENSITY - A plurality of loads ( | 03-04-2010 |
| 20100084984 | Energy-Saving LED-Based Lighting Device - This invention describes a lighting device with low energy consumption, which is made up of light emitting diodes known by the English acronym of LEDs, that use the technique known as “scanning”; with the purpose of reducing the consumption of energy required for lighting. Said scanning is performed by an efficient circuit that determines the sequence and time required for the activation of each LED or group of LEDs. The invention does not limit itself to only using LEDs, other types of elements for control may be used that may be sequenced without altering its operation or useful life. In this case, the speed that may support the LEDs is taken advantage of and that is higher than can be seen by the human eye, where each LED or group of LEDs are turned on and off at a frequency that is imperceptible by the human eye. | 04-08-2010 |
| 20100084985 | Low Voltage Outdoor Lighting Power Source and Control System - A power source and control system is particularly suited for use in an outdoor landscape lighting system. The power source and control system includes at least one switching mode AC-to-DC power supply having an additional output stage for efficiently converting the DC output signal into another relatively low frequency AC signal for transmission to a plurality of buried power conductors. A Manchester encoded control signal is encoded at a relatively high frequency onto the AC signal sent over the buried power conductors so that intelligent LED lighting fixtures can be powered by the AC signal and selectively have their intensity changed when they decode the control signal. | 04-08-2010 |
| 20100097001 | AUTO-CONTROLLING POWER SAVING SYSTEM FOR SOLAR ENERGY STREET LAMPS - An auto-controlling power saving system for solar energy street lamps includes at least one street lamp, each street lamp having a light source at an upper end thereof; a battery set; at least one solar plate installed at an upper end of the light source for absorbing solar energy; the absorbed solar energy being converted into electric power which is transferred to the light source for lighting up the light source or is stored in the battery set; a main controller for controlling all electric powers of the elements of the system for power management; the main controller controlling actuation, de-actuation and illumination of all street lamps; the main controller being connected to the battery sets of the street lamps and the related elements used; the main controller having a plurality of power control modes for power management and illumination control of the street lamps. | 04-22-2010 |
| 20100097002 | Quantum dimming via sequential stepped modulation of led arrays - In one method of and apparatus for varying the luminosity of illumination, each of a plurality of light sources has an on state in which it emits light and an off state in which it does not emit light. Each of the plurality of light sources is switched cyclically between the on state and the off state in a sequence over a cycle period. The switching sequence is selected such that the number of said light sources that are on is uniform over the cycle. The luminosity of the illumination is varied by varying the proportion of each cycle for which each light source is switched on. | 04-22-2010 |
| 20100102737 | Device For Supplying Power To LED Diodes - A device for supplying diodes LED includes an electric bridge (ABHG) with input terminals (A, B) and output terminals (H, G), including diodes (DS | 04-29-2010 |
| 20100109540 | ORGANIC LIGHT EMITTING DIODE DISPLAY - An organic light emitting diode display includes a first scan switching element controlled in response to a first scan signal from a first scan line and connected between a first data line and a first node, a first storage capacitor connected between the first node and an AC voltage supply line, a first driving switching element controlled in response to a signal applied to the first node and connected between a second node and the AC voltage supply line, a light emitting element connected between a high-level voltage supply line and the second node, a first sensing switching element controlled in response to a first gate signal from a first gate line and connected between the first data line and the second node, a second scan switching element controlled in response to a second scan signal from a second scan line and connected between a second data line and a third node, a second storage capacitor connected between the third node and the AC voltage supply line, and a second driving switching element controlled in response to a signal applied to the third node and connected between the second node and the AC voltage supply line. | 05-06-2010 |
| 20100134027 | MULTI-LAMP HID LUMINAIRE WITH CYCLING SWITCH - A multi-lamp HID luminaire is provided with a HID ballast. An ignitor that produces a high voltage ignition pulse is coupled to the HID ballast and is also coupled to a plurality of HID lamp sockets that receive HID lamps. A cycling switch is also electrically coupled to the HID ballast and causes a periodic power interruption to the plurality of HID lamp sockets. | 06-03-2010 |
| 20100156306 | BACKLIGHT DRIVING SYSTEM - A backlight driving system driving a plurality of lamp groups comprises a phase controller, a pulse width module (PWM) controller, a plurality of power stages, a plurality of transformers and a plurality of switch circuits. The phase controller generates a plurality of phase signals. The PWM controller generates PWM signals. | 06-24-2010 |
| 20100171432 | METHOD AND APPARATUS FOR PREVENTING INTRUSION - A method of controlling one or more light sources for preventing unauthorized intrusion or/and staying within an area outdoors or indoors, for example in a building, in a portion of a building, in a vehicle or in a craft, wherein the light source or light sources are controlled in such manner that one or more of the following characteristics of the light are altered, viz. the intensity of the light, the wavelength of the light, the frequency at which the light source or light sources are switched on and the time during which the light source or light sources are on. The invention also comprises a corresponding apparatus. | 07-08-2010 |
| 20100188005 | LIGHT OUTPUT DEVICE - A light output device comprises a substrate arrangement comprising a plurality of light source circuits integrated into the structure of the substrate arrangement. Each light source circuit comprises a light source device arrangement ( | 07-29-2010 |
| 20100207535 | Backlight unit for liquid crystal display device and driving method driving the same - A backlight unit for a liquid crystal display device includes: at least one light source; and an inverter circuit part including a dimming test portion generating a dimming signal and turning ON/OFF the at least one light source using the dimming signal. | 08-19-2010 |
| 20100213858 | POWER SUPPLY FOR AN LED ILLUMINATION DEVICE - An illumination device includes one or more LED's and a power supply configured to convert energy from a commercial AC power source and drive said LED's. The power supply includes a rectifier circuit, a phase detection circuit receiving an output voltage from the rectifier circuit and a switching element. A circuit includes the one or more LED's, an inductive element and a diode, and is coupled on a first end to the rectifier circuit and coupled on a second end to ground through the switching element. A current sensor is positioned to detect a current flowing to the light-emitting diode. A control circuit is coupled to receive the detected current and the detected phase of the rectified output voltage, and further coupled to the switching element and configured to generate a PWM signal for driving the switching element at a frequency higher than a commercial AC frequency. The PWM signal has a pulse width determined in accordance with one or more of a feedback control based on a current detected by the current sensor and a feed-forward control based on a phase of the pulsating voltage detected by the phase detection circuit. | 08-26-2010 |
| 20100225238 | Color Display - A colored light generating element can be configured to, while in an active state, pulse between an off state and an on state. A substantially constant offset voltage or current can be applied to the colored light generating element during a predetermined time interval when the light generating element is in the off state so as to cause the colored light generating element to emit, during the off state, some amount of light greater than a minimum amount of light that the light generating element is capable of generating while part of an active system. In some implementations, two or more offset voltages or currents can be applied. Implementations may include a preprocessor configured to receive an image signal and optimize color saturation of the image signal, such as by limiting and non-linearly increasing color saturation. Implementations may include multiple colored light generating elements. | 09-09-2010 |
| 20100237790 | SYSTEM AND METHOD FOR SELECTIVELY DIMMING AN LED - Embodiments of the present disclosure include an LED ballast circuit for dimming one or more LEDs using a phase controlled dimmer switch. The LED ballast circuit has a power conditioning unit which includes a substantially fixed duty cycle clock for outputting a clock cycle and a transformer configured to store energy and discharge a substantial portion of the stored energy once per clock cycle in order to power one or more LEDs. The LED ballast circuit and load collectively behave like a resistor. | 09-23-2010 |
| 20100237791 | ELECTRONIC BALLAST AND METHOD FOR OPERATING AT LEAST ONE FIRST AND SECOND DISCHARGE LAMP - An electronic ballast for operating at least two discharge lamps is provided, which may include a starting detection apparatus for detecting whether one of the discharge lamps has been started; wherein a drive circuit includes an input, which is coupled to a starting detection apparatus, wherein a threshold value entry apparatus is designed to enter a second threshold value for a setpoint value of a total current through at least two inductances, wherein the second threshold value has a smaller magnitude than a first threshold value; and wherein the drive circuit is designed to drive a first electronic switch and a second electronic switch taking into consideration the first threshold value as setpoint value prior to detection of the starting of a discharge lamp by the starting detection apparatus, and taking into consideration the second threshold value as setpoint value. | 09-23-2010 |
| 20100259178 | Stereoscopic View Light Source, with multiple modes of operation - A device operating with electromagnetic waves, or photons, within the visible light spectrum or in any other particle-wave spectrum, emitting or receiving such particle-waves. The herein presented system transmits the visible spectrum of light and relies on the property of the human eye-brain inertia (scotoma), in receiving, processing and storing the visual information for the purpose of increasing the field of view to stereoscopic parameters. The device works by sequentially switching each individual light source, on-off at a frequency equal or higher than 30 Hz. | 10-14-2010 |
| 20100264838 | LED LIGHTING DEVICE - Aspects of the disclosure provide light emitting diode (LED) lighting devices, and methods to drive the LED lighting devices. An LED lighting device includes a transformer having a primary winding on a receiving path to receive electric energy from an energy source and a secondary winding on a driving path. A terminal of the receiving path and a terminal of the driving path have a same voltage level, such as ground. Further, the LED lighting device includes a primary switch configured to switch on the receiving path to receive and store the electric energy in the transformer, and to switch off the receiving path to allow the driving path to deliver the stored electric energy. The LED lighting device also includes an LED array coupled to the driving path to emit light in response to the delivered electric energy. | 10-21-2010 |
| 20100283398 | DRIVING DEVICE OF LIGHTING APPARATUS - A driving device of a lighting apparatus includes a control circuit and a power conversion circuit. The power conversion circuit is electrically connected to the control circuit, a first light-emitting diode (LED) unit, and a second LED unit. The power conversion circuit has a switching unit, an electrical isolating unit, and a transformer unit. The electrical isolating unit has an electrical isolating side and a non-electric-isolating side, which is coupled to the electrical isolating side. The non-electrical isolating side is electrically connected to the switching unit. The transformer unit, which is electrically connected to the electrical isolating side, has a first output terminal and a second output terminal. The first output terminal is electrically connected to a positive electrode of the first LED unit and a negative electrode of the second LED unit. The second output terminal is electrically connected to a negative electrode of the first LED unit and a positive electrode of the second LED unit. | 11-11-2010 |
| 20100289418 | ELECTRONIC CIRCUIT FOR DC CONVERSION OF FLUORESCENT LIGHTING BALLAST - Embodiments of an illumination device including LEDs for connection to an existing fluorescent lamp fixture including a conventional ballast described. One illumination device includes protection circuitry configured to protect the illumination device from the ballast current signal, a full-wave rectifier, a smoothing filter electrically coupled to the full wave rectifier, and a current regulator power circuit electrically coupled to the smoothing filter and the LEDS. The current regulator power circuit can include a first switching element configured to operate in response to a first (PWM) ON/OFF control signal; a current controller electrically coupled to a gate of the first switching element, the current controller configured to generate the first PWM control signal; and a current sense resistor electrically coupled to the first switching element and configured to sense the current through the LEDS, wherein the sensed current is fed back to the current controller. | 11-18-2010 |
| 20100320921 | Light emitting device driving apparatus and method for driving the same - The present invention relates to a light emitting device (LED) driving apparatus that constantly maintains the average current flowing onto a plurality of channels. The light emitting device (LED) driving apparatus includes: a LED light source unit in which at least one LED channel is connected in parallel; at least one current detector that is disposed on a low end of a LED channel of the LED light source unit to detect the current flowing onto respective LED channels; at least one channel current controller that generates control signal controlling the average current of the channels by comparing current detected from the channels with reference wave; and a switching element that controls the average current of the LED channels in a PWM scheme according to the control signals. | 12-23-2010 |
| 20100320922 | ILLUMINATION DEVICE INCLUDING LEDS AND A SWITCHING POWER CONTROL SYSTEM - Disclosed herein is an illumination device including light-emitting diodes, an alternating current input, a full-wave rectifier coupled to the alternating current input and configured to produce a rectified voltage output and a power converter, the power converter having a switching element electrically coupled to the rectified voltage output of the full-wave rectifier. An improvement of the illumination device includes a feedback circuit configured to determine an average current across the light-emitting diodes and to invert a signal representing the average current to provide a switching signal to the switching element such that, for a range of operating points, increasing a current drawn into the power converter will decrease LED power and decreasing the current drawn into the power converter will increase LED power. | 12-23-2010 |
| 20100327759 | ELECTRONIC BALLAST FOR A FLUORESCENT LAMP - An electronic ballast for supplying a lamp load is described. The electronic ballast comprises an inverter arranged in a half-bridge configuration for providing an AC voltage and at least one lamp load circuit. The inverter comprises an upper switch, connected to a DC terminal for receiving a DC supply voltage, and a first lower switch arranged in a half-bridge configuration for generating an AC voltage at an inverter terminal of the inverter. A first diode and a second lower switch are connected in series. This series arrangement is connected in parallel with the first lower switch. A lamp load circuit for supplying the lamp load is connected to a node between the first diode and the second lower switch. When the inverter supplies a fluorescent lamp, and the lamp load circuit comprises a heating circuit for heating an electrode of the fluorescent lamp, the heating circuit includes a heating transformer and a second lower switch connected in parallel with the primary winding of the transformer. By doing so, the heating circuit can be operated and controlled independent of the current supplied to the fluorescent lamp, or operating conditions of the fluorescent lamp. | 12-30-2010 |
| 20100327760 | INVERTER DEVICE AND DRIVING METHOD THEREOF - The present invention relates to an inverter and the driving method. The inverter according to exemplary embodiment of the present invention generates a plurality of feedback voltages corresponding to driving voltages of a plurality of discharge lamps. The inverter generates a first minimum voltage having a smaller feedback voltage of a plurality of feedback voltages and compares the first minimum voltage and a short circuit reference voltage in order to determine a short circuit of at least two discharge lamps. The inverter senses a short circuit lamp of a plurality of the discharge lamps by using the comparison result and a first sawtooth wave signal having a predetermined period. Also, the inverter generates a plurality of feedback voltages corresponding to driving currents of a plurality of discharge lamps, generates a second minimum voltage having a smaller feedback voltage of a plurality of the feedback voltages, and compares the second minimum voltage and an open circuit reference voltage in order to determine the open circuit of the at least two discharge lamps. The inverter senses an open circuit lamp of a plurality of discharge lamps by using the comparison result and a first sawtooth wave signal having a predetermined period. | 12-30-2010 |
| 20110068703 | 90-260Vac Dimmable MR16 LED Lamp - A line voltage LED Lamp produces variable illumination in response to industry standard lighting dimmers, through the use of an input voltage monitoring circuit which variably controls the current output of an integral driver in response to sensed changes in the input voltage. A cascaded converter circuit is used to achieve a very high step-down ratio, enabling the LEDs to be driven from a high input voltage without the need for a power transformer. Electrolytic capacitors are avoided, increasing the life of the driver circuit in the high ambient temperatures typically encountered in the base of similar lamps. The circuit employed drives high power LEDs, and the lamp is adapted to fit common MR16 size fixtures. Illumination output equivalent to similar size halogen bulbs is achieved. | 03-24-2011 |
| 20110068704 | Adaptive dimmable LED lamp - A low voltage LED Lamp produces variable illumination in response to industry standard lighting dimmers, through the use of an input voltage monitoring circuit which variably controls the current output of an integral driver in response to sensed changes in the input voltage. Input circuitry is employed to provide “ghost” loading in the case of high frequency voltage sources such as that provided by certain electronic ballasts requiring minimum loads to operate. Additionally, the capacitive nature of prior art LED driving circuits is altered, increasing power factor and further helping electronic ballasts run properly. A firmware algorithm adapts to the output voltage capability of the driving transformer, dynamically adjusting the illumination to achieve the best dimming curve suited to each transformer. The circuit employed drives high power LEDs, and the lamp is preferably adapted to fit common MR16 size fixtures. Illumination output equivalent to similar size halogen bulbs is achieved. | 03-24-2011 |
| 20110074301 | Pulse-Width Modulated Signal Generator for Light-Emitting Diode Dimming - A circuit to control light-emitting-diode (LED) dimming of a display panel, is provided. The circuit includes a first stage to receive an incoming PWM signal from an application driver, the incoming PWM signal having a first frequency and a first duty cycle. A second stage in the circuit is provided to produce and transmit an output PWM signal, the second PWM signal having a second frequency according to the characteristics of the display panel, a second duty cycle. | 03-31-2011 |
| 20110109237 | EFFICIENT POWER SUPPLY FOR SOLID STATE LIGHTING SYSTEM - Drive circuitry drives a plurality of solid state light emitters coupled between a higher voltage node and a lower voltage node. The drive circuitry includes a switching regulator, such as a buck regulator, having a switch and an inductive element coupled between the switch and the lower voltage node to electrically connect the switch to the lower voltage node. A controller drives the switch in accordance with an output signal produced by the solid state light emitters. Input power supply circuitry supplies an input power supply signal for providing a voltage level at the higher voltage node to operate the solid state light emitters. The input power supply circuitry is configured for supplying the controller with a first power supply signal produced based on the input power supply signal. Operation power supply circuitry is electrically connected to the lower voltage node for supplying the controller with a second power supply signal when the voltage level developed at the lower voltage node is sufficient to support operation of the controller. | 05-12-2011 |
| 20110121742 | CIRCUIT ARRANGEMENT AND METHOD FOR CONTROLLING LIGHT EMITTING COMPONENTS - In order to further develop a circuit arrangement and a method for controlling at least one light emitting component, to which a threshold current is applied, with the circuit arrangement being supplied with voltage by means of at least one supply element, and with the light emitting component being controlled by means of at least one switching element arranged between at least one current limiting element and the light emitting component using at least one switching controller, in such a way that the power efficiency is significantly increased in comparison to prior art, it is proposed that a maximum value of the current is provided by means of the current limiting element, and that the logical “1” of the data to be transmitted by means of the light emitting component is represented by periodic switching between the zero value of the current and the maximum value of the current supplied to the light emitting component. | 05-26-2011 |
| 20110193489 | METHODS AND APPARATUS FOR CONTROLLING MULTIPLE LIGHT SOURCES VIA A SINGLE REGULATOR CIRCUIT TO PROVIDE VARIABLE COLOR AND/OR COLOR TEMPERATURE LIGHT - Methods and apparatus for adjusting the color or color temperature of combined light emitted by one or more LEDs ( | 08-11-2011 |
| 20110204804 | BACKLIGHT UNIT DRIVER - There is provided a backlight unit driver capable of driving multi-channel lamps of a backlight unit, especially LED lamps, by supplying a driving power to the lamps using a single transformer and maintaining the current balance of the driving power supplied to each of the lamps. | 08-25-2011 |
| 20110204805 | COLOR TEMPERATURE TUNABLE WHITE LIGHT SOURCE - A color temperature tunable white light source comprises a first LED arrangement comprising at least one blue emitting LED configured to excite a remote phosphor and a second LED arrangement comprising at least one red emitting LED. The LED arrangements are configured such that the composite light emitted by the LED arrangements appears white in color. The relative drive currents of the LEDs is controllable, and thus variable in relative magnitude, such that the color temperature of the composite light emitted by the source is electrically tunable. | 08-25-2011 |
| 20110215726 | Dynamically Controllable Drive Circuit For Parallel Array Of Light Emitting Diodes - The present invention relates to a parallel light emitting diode (“LED”) drive circuit and provides a drive circuit configured to drive a parallel array of LEDs. The drive circuit comprises: a switching control signal generator, a plurality of switches, a plurality of sampling resistors, and a plurality of chopper amplifiers. Each switch is coupled to a respective LED in the LED array. Each chopper operational amplifier configured to receive a reference voltage and a switching control signal generated by the switching control signal generator and generate an input offset voltage. Each chopper operational amplifier includes a differential amplifier including an input transistor pair and a current mirror transistor pair, of which the electrical positions can be reserved when the switching control signal is switched between a first state and a second state, wherein the offset voltage, which causes the lightness mismatching in a parallel LED circuit, can be cancelled. | 09-08-2011 |
| 20110215727 | Drive Circuit For Parallel Array of Light Emitting Diodes - The present invention relates to a parallel light emitting diode (“LED”) drive circuit and provides a drive circuit configured to drive a parallel array of LEDs. The drive circuit comprises: a plurality of switches, a plurality of sampling resistors, and a plurality of chopper amplifiers. Each switch is coupled to a respective LED in the LED array. Each chopper operational amplifier configured to receive a reference voltage and a switching control signal and generate an input offset voltage. Each chopper operational amplifier includes a differential amplifier including an input transistor pair and a current mirror transistor pair, of which the electrical positions can be reserved when the switching control signal is switched between a first state and a second state, wherein the offset voltage, which causes the lightness mismatching in a parallel LED circuit, can be cancelled. | 09-08-2011 |
| 20110215728 | 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 unit-to-unit variations. | 09-08-2011 |
| 20110248640 | LED BASED LIGHTING APPLICATION - The present invention relates to a lighting application, the lighting application can e.g. comprise an LED assembly comprising a serial connection of two or more LED units, each LED unit comprising one or more LEDs, each LED unit being provided with a controllable switch for substantially short-circuiting the LED unit. The lighting application further comprises a control unit for controlling a drive unit and arranged to receive a signal representing a voltage level of the supply voltage, and control the switches in accordance with the signal. The invention further provides for an LED driver that enables to operate a TRIAC based dimmer at an optimal holding current and an LED driver comprising a switchable buffer, e.g. a capacitor. | 10-13-2011 |
| 20110254457 | CIRCUIT FOR THE OPERATION OF AT LEAST ONE LED - A circuit for operating at least one LED (“driver circuit”) includes input terminals to be connected to an input or operating voltage in the form of a direct current (DC) voltage or a rectified alternating current (AC) voltage, and output terminals to be connected to a load circuit containing the at least one LED. The circuit includes a clocked switch and an open-loop control circuit for clocking the switch. The open-loop control circuit is in the form of an integrated circuit (IC) and is provided with input and output pins. The open-loop control circuit generates a clock signal for the switch depending on at least two actual value signals, such that there is a control loop with the manipulated variable “clocking of the switch.” | 10-20-2011 |
| 20110273104 | CONTROL CIRCUIT FOR SWITCHING POWER SUPPLY - A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string which is driven in an intermittent manner. A sample-and-hold circuit performs sampling of a detection voltage Vs that corresponds to a driving voltage Vout in the on period, and holds the sampled detection voltage Vs in the off period. In the off period, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a hold detection voltage VsH output from the sample-and-hold circuit matches the detection voltage Vs. A driver drives a switching transistor according to the pulse signal. | 11-10-2011 |
| 20110279048 | CIRCUITS FOR SENSING CURRENT LEVELS WITHIN LIGHTING APPARATUS - Circuits for sensing current levels within an apparatus are disclosed. In specific cases, a constant voltage power supply is used to power an LED lighting apparatus in which there are uncertainties within the forward voltages of the LEDs, which in turn creates uncertainty with respect to the current level flowing through the LEDs. To manage these uncertainties, the current flowing through the LEDs is measured by determining a voltage level across a known resistor and calculating the current level. To prevent the known resistor from causing a significant reduction in the efficiency of the overall light engine, the circuit includes one or more transistors in parallel with the known resistor to reduce the effective resistance in the LED circuit during times that the current is not being sensed. | 11-17-2011 |
| 20110285304 | Error Amplifier and LED Circuit Comprising the Same - An error amplifier and a LED circuit comprising the same are provided. The LED circuit comprises an inductor, a group of LEDs and a power MOS connected to the inductor, an error amplifier and a pulse width modulator controlling the gate of the power MOS according to an error amplifier output. The error amplifier comprises a differential input stage, an output stage having a first NMOS, a first PMOS, a second NMOS, a second PMOS and a control switch module. During a first operation mode, the control switch module connects the first NMOS and PMOS and connects the second NMOS and PMOS, and during a second operation mode, control switch module disables the second NMOS and PMOS. | 11-24-2011 |
| 20110285305 | LIGHT EMITTING DEVICE - A display device in which characteristic change of an organic light emitting layer due to deterioration or temperature change can be detected to keep the constant luminance of a light emitting element is provided. A monitor region is provided in addition to a pixel portion for display. A plurality of monitor elements is arranged in the monitor region. A switching circuit is provided so as to prevent a large amount of current from flowing in a shorted monitor element among the plurality of monitor elements. As a result, by monitoring potential change between electrodes of the monitor element, the voltage or the current that is supplied to a light emitting element in the pixel portion for display can be corrected in accordance with time degradation or temperature change. | 11-24-2011 |
| 20110291576 | Driving system with inductor pre-charging for LED systems with PWM dimming control or other loads - A method includes receiving a control signal associated with a load, where the control signal is to cause a load change from a perspective of a switching-mode power supply. The method also includes causing the power supply to adjust a current through an inductor of the power supply in response to the control signal. The method further includes delaying delivery of the control signal in order to delay a time of the load change, where the current through the inductor increases during the delay. The control signal could include a request to turn on one or more LEDs. The load could include a current regulator. The method could further include providing the request to the current regulator after the delay, such as after the current through the inductor reaches a specified level. Voltage spikes and audible noise in a capacitor coupled to an output of the power supply can be minimized. | 12-01-2011 |
| 20110316435 | Control of Delivery of Current Through One or More Discharge Lamps - Control of delivery of current through one or more discharge lamps. Methods include alternately switching on and off switching elements that control a fluorescent lamp, in response to receiving input, until the brightness of the lamp decreases to a threshold. Further, methods include providing control signals at complementary duty cycles to further decrease the brightness and alternating the duty cycles of the signals applied to the filaments of the fluorescent lamp. | 12-29-2011 |
| 20120025727 | METHOD FOR CONTROLLING LIGHT-EMITTING DIODES - A method and a device for gradually controlling the illuminating light intensity of light-emitting diodes by modulating the width of current pulses of defined duty cycle, using a DC-to-DC voltage converter and a control circuit for switching the supply current of the light-emitting diodes. Prior to switching the power supply of the diodes the DC-to-DC converter is initiated (A), so as to generate voltage pulses of defined duty cycle; the steady state of each pulse is determined (B), so as to generate a voltage pulse (CP) calibrated to a voltage level substantially corresponding to the steady-state level; and then the light-emitting diodes are powered (D) by applying each calibrated pulse to the light-emitting diodes by means of the switchable control circuit. | 02-02-2012 |
| 20120043901 | LIGHTING DEVICE AND DISPLAYING DEVICE - In a lighting device ( | 02-23-2012 |
| 20120062135 | DISPLAY APPARATUS AND METHOD OF DRIVING PIXEL THEREOF - A display apparatus includes a plurality of pixels each including first and second organic EL elements whose emitting periods are controlled by respective emitting-period control TFTs. The second organic EL element has a front luminance lower than that of the first organic EL element. An electric charge charged in a storage capacitor as a gradation display signal in a previous frame is erased through an erasing TFT and the second organic EL element. | 03-15-2012 |
| 20120074859 | DRIVER FOR LIGHT EMITTING DIODES - There is provided a driver for light emitting diodes capable of differently setting duties in which driving current flows depending on respective light emitting diode (LED) channels according to a voltage deviation between the LED channels in order to reduce heat generated due to the voltage deviation between the LED channels. The driver for LEDs includes: a detecting unit detecting a voltage drop generated in each of a plurality of LED channels receiving driving power having a preset voltage level; a converting unit converting detected analog values from the detecting unit into digital values; and a driving unit differently setting switching duties in which driving current flows in each of the plurality of LED channels according to the digital values from the converting unit to drive the plurality of LED channels. | 03-29-2012 |
| 20120091908 | DRIVING CIRCUIT AND DRIVING METHOD OF BACKLIGHT MODULE OF DISPLAY APPARATUS - The present invention provides a driving circuit and a driving method of a backlight module of a display apparatus. The driving method comprises the following steps: utilizing a phase detector to detect voltage phases of an inductor and a capacitor of a resonant circuit; utilizing a frequency adjusting module to obtain an operation frequency according to a phase detection signal; and utilizing a driving chip to drive a DC-to-AC power stage circuit according to the operation frequency. The invention can improve the transformation efficiency of the driving circuit. | 04-19-2012 |
| 20120098451 | LIGHT EMITTING MODULE DEVICE, LIGHT EMITTING MODULE USED IN THE DEVICE, AND LIGHTING APPARATUS PROVIDED WITH THE DEVICE - A light emitting module device includes: a power line through which power is supplied to light emitting modules; and a signal generation circuit which generates a control signal. The power line is shared by a plurality of the light emitting modules, and has switches and switches which turn on or off current conduction to the light emitting modules, through open/close operations. The signal generation circuit individually controls the switches and the switches. The open/close operations include a light-emission period in which the light emitting module emits light; and an extinction period in which the light emitting module is extinguished, and if there is a control signal to be transmitted to the light emitting module, the control signal is superimposed onto supply power. Since a control signal is superimposed onto supply power to each light emitting module, the light emitting modules can be individually controlled. In addition, since the power line can be used also as a communication line, and the power line can be shared by a plurality of the light emitting modules, the number of lines can be decreased. | 04-26-2012 |
| 20120104960 | CIRCUIT FOR CONVERTING DC INTO AC PULSED VOLTAGE - The present invention proposes a circuit for converting DC into AC pulsed voltage. The circuit comprises two or four controllable semiconductor switches as well as a corresponding controller unit. The controller unit controls the opening and closing of the two or four controllable semiconductor switches using a preset control mode. When the circuit is used as the driver circuit of a capacitive load such as a DBD lamp, the luminous efficiency of the DBD lamp is improved. | 05-03-2012 |
| 20120133295 | POWER REGULATION OF LED BY MEANS OF AN AVERAGE VALUE OF THE LED CURRENT AND BIDIRECTIONAL COUNTER - A circuit for the power regulation of an LED comprises a converter having a switch. The LED is interconnected in an output circuit, wherein a control unit controls the magnetization of an inductor, in that it actively clocks the switch. A measured actual value representative of the average value of the LED current is returned to the control unit and compared to a reference value. | 05-31-2012 |
| 20120139434 | DRIVING APPARATUS OF LIGHT EMITTING DIODE AND DRIVING METHOD THEREOF - A driving method of a light-emitting diode (LED) adapted to a driving apparatus is provided. The driving method includes receiving a dimming signal, detecting whether the driving apparatus performs dimming, and if the driving apparatus performs dimming, determining whether a duty cycle of the dimming signal is smaller than a predetermined value. When the duty cycle of the dimming signal is not smaller than the predetermined value, respective current magnitudes of a plurality of driving currents are regulated according to the dimming signal, and each of the driving currents is output for a full time of a period. Conversely, when the duty cycle of the dimming signal is smaller than the predetermined value, each of the driving currents is output for a partial time of a period. A driving apparatus employing the driving method is also provided. | 06-07-2012 |
| 20120146528 | Circuit Configuration for Operating LEDS for a Micromirror Arrangement - A circuit configuration for operating at least one LED, comprising: an input with a first input terminal (E | 06-14-2012 |
| 20120146529 | METHOD AND APPARATUS PROVIDING UNIVERSAL VOLTAGE INPUT FOR SOLID STATE LIGHT FIXTURES - A method for providing universal voltage input to a solid state lighting fixture ( | 06-14-2012 |
| 20120176057 | CONTROL APPARATUS FOR LED DIODES - A control apparatus for LED diodes includes a dimmer TRIAC electrically connected in series between a power supply and a LED lighting converter. The converter comprises a transformer, with a primary winding coupled with an input terminal and a secondary winding coupled with an output terminal, and a switch coupled to the primary winding to regulate the current through the primary winding and regulate the output voltage. The apparatus comprises a control device adapted to control said switch determining the on period and the off period of the switch to maintain constant the output current to supply said LED diodes. The apparatus comprises a detector connected to the secondary winding of the transformer and adapted to detect the conduction angle of the TRIAC; the control device is adapted to regulate the output current to supply said LED diodes in response to the TRIAC conduction angle detected by the detector. | 07-12-2012 |
| 20120181942 | COMPENSATION CIRCUIT FOR CURRENT PEAKING REDUCTION IN NOTIFICATION APPLIANCES - A system and apparatus to reduce current peaking in notification appliances are described. The apparatus may include a current peaking compensation circuit comprising two or more transistors and one or more capacitors configured to reduce a start-up frequency of a pulse-width modulated signal during a first time period and to add a time constant decaying voltage across a resistor divider network to increase a reference voltage during the first time period. Other embodiments are described and claimed. | 07-19-2012 |
| 20120181943 | MULTIPLE CAPACITIVE (BUTTON) SENSOR WITH REDUCED PINOUT - A capacitive touch sensor and LED driver device achieves a reduction in pin count by multiplexing LED drive functionality and capacitive sense functionality on each input/output pin. A control circuit switches between LED drive mode and capacitive sense mode at a frequency of approximately 200 Hz, although other switching frequencies can be used. A bias driver functions as a current sink for LEDs in LED drive mode and can also be used to drive a bias voltage to the LEDs during capacitive sense mode to improve noise immunity. | 07-19-2012 |
| 20120187856 | PACKAGE STRUCTURE OF FULL-COLOR LED INTEGRATED WITH DRIVING MECHANISM AND CURRENT LIMITING ELEMENTS - A package structure of full-color LED (Light Emitting Diode) integrated with driving mechanism and current limiting elements includes an driving IC (Integrated Circuit) chip, a red LED dice, a green LED dice, a blue LED dice. The IC chip has a driving mechanism to control the red LED dice, the green LED dice, and the blue LED dice. And the current limiting elements are integrated into the driving IC chip. By the specific arrangement of these internal elements, the package structure generates full-color light with high resolution, compact structure and high mixing uniformity, and also achieves low cost and decreases usage of space. | 07-26-2012 |
| 20120200231 | LIGHTING DEVICE FOR SEMICONDUCTOR LIGHT EMITTING ELEMENTS AND ILLUMINATION APPARATUS INCLUDING SAME - A lighting device includes a first and a second gate circuit having a first input to which a high frequency square wave signal generated from a high frequency oscillation circuit is inputted and a second input to which a first low frequency square wave signal is inputted; and a second gate circuit having a first input to which the high frequency square wave signal is inputted and a second input to which a second low frequency square wave signal is inputted. Each of the first and the second low frequency square wave signal has a frequency lower than that of the high frequency square wave signal, and the first and the second low frequency square wave signal determine whether the high frequency square wave signal is supplied, as on/off switching signals, to the first and the second switching power supply circuit, respectively. | 08-09-2012 |
| 20120212146 | LED DRIVING DEVICE - Disclosed herein is a light emitting diode (LED) driving device for driving a multi-channel LED element or an LED array for each channel, the LED driving device including: a constant current driver driving currents flowing in each channel; a first switching unit selectively feeding-back voltage levels of each channel; and a switching controller controlling the turn on/off of the first switching unit, wherein matching characteristics of currents flowing in each channel is improved and a size of an integrated circuit (IC) chip is also reduced as compared to a case according to the related art, thereby making it possible to reduce a production cost and satisfy the trend of miniaturization of the chip, while solving a performance deterioration problem due to degradation of the matching of the currents between the channels. | 08-23-2012 |
| 20120229044 | AUTO-SWITCHING TRIAC COMPATIBILITY CIRCUIT WITH AUTO-LEVELING AND OVERVOLTAGE PROTECTION - Drivers and ballast circuits are presented having a boost converter with a triac compatibility circuit providing regulated current load to accommodate phase-cutting triac circuit holding current requirements, including auto switching driver circuit with overvoltage protection and an auto leveling circuit to regulate against thermal and load fluctuations. | 09-13-2012 |
| 20120235589 | METHODS AND APPARATUSES FOR OPERATING GROUPS OF HIGH-POWER LEDS - In energy-efficient, compact and cost-effective solution for driving a number of high-power LED groups for lighting applications includes using a single switching power supply together with LEDs connected in series and/or in parallel and pulse width-controlled switches in parallel across the individually controllable LED groups. If the switch of an LED group is ON, the LED group will not light up. If the switch is in the OFF position, the full current of the power supply will pass through the corresponding LED group. | 09-20-2012 |
| 20120235590 | DEVICE AND METHOD FOR ADDRESSING POWER TO A LOAD SELECTED FROM A PLURALITY OF LOADS - The invention relates to a device and method for addressing power to at least a selected load from a plurality of loads, in particular light sources in solid state lighting applications, such as decorative indoor and outdoor illumination for buildings or cars, by timing a power signal such as to power a selected load when said common timed power signal is switched to said load under control of a delayed clock signal. | 09-20-2012 |
| 20120242241 | LIGHTING APPARATUS WITH AT LEAST ONE LED - The present invention relates to a lighting apparatus with at least one LED, in particular an LED retrofit, in which a surge arrester whose breakdown voltage is above the maximum system voltage and below the starting voltage of the fluorescent lamp which is intended to be replaced by a lighting apparatus according to an embodiment. In this way, a lighting apparatus according to an embodiment can be operated using the ballast originally designed for a fluorescent lamp, wherein, moreover, a risk to an operator when inserting a lighting apparatus according to an embodiment into a luminaire can reliably be ruled out. | 09-27-2012 |
| 20120242242 | Color Coordination Of Electronic Light Sources With Dimming And Temperature Responsiveness - A lighting system includes one or more methods and systems to control the color spectrum of a lamp in response to both temperature and dim levels. In at least one embodiment, the lighting system includes a controller to control a correlated color temperature (CCT) and intensity of the lamp by independently adjusting currents to electronic light sources based on a dim level of the lighting system and temperature of the lighting system. The controller controls a first current to a first set of LEDs and a second current to a second set of LEDs. The control of the first current by the controller is jointly dependent on a dim level and temperature in the lighting system. In at least one embodiment, the control of the second current is dependent on the dim level or the dim level and temperature. | 09-27-2012 |
| 20120242243 | CIRCUIT ASSEMBLY FOR OPERATING AT LEAST ONE DISCHARGE LAMP - A circuit assembly for operating a discharge lamp is disclosed having DC input terminals, a bridge circuit to implement a first bridge midpoint, an output coupling the discharge lamp thereto and a shunt resistor with a tapping point and a device for detecting overload operation. A device for ignition control of the discharge lamp, having an input for supplying a measurement signal and a switch control device is provided connected to the device for detecting overload operation and the ignition control device. The switch control device is designed to modify control signals for at least a first and second electronic switch as a function of the output signals of the device for detecting overload operation. | 09-27-2012 |
| 20120262080 | SOLID STATE LIGHT SOURCE BASED LIGHTING DEVICE AND LIGHTING SYSTEM - A lighting device is capable of realizing a stable dimming control in a wide range of light output. The lighting device includes a DC power circuit for providing power to a switching element of the lighting device. A current controller switches the switching element to enable a current to flow from the DC power circuit through a solid state light source and maintain the current from the DC power circuit through the solid state light source current controller at a predetermined current. The current controller includes a first switching controller operable to change a width of an on-pulse provided to the switching element and a second switching controller operable to determine a burst-on time during which the on-pulses determined by the first switching controller are provided to the switching element. The burst-on time is longer than an on-pulse period of the first switching controller. | 10-18-2012 |
| 20120268026 | Biphase Laser Diode Driver And Method - A current-driven load such as LEDs or laser diodes is driven by a current driver having a two stages (or phases), the outputs of which have ripple which is forced to be out-of-phase with one another. In analog embodiments, an output (ripple or switching) of a master stage hysteresis controller is phase-shifted and scaled, and modulates the input of a slave stage hysteresis controller so that the slave stage pulls into a ripple-canceling phase. In digital embodiments, a faster of the two phases is designated “master”, maximum and minimum thresholds are set, and the slave phase's on time is based on a previous cycle's slave phase ON time, the master stage OFF time and an offset. The slave controller may “lock” to the anti-phase of the master stage (or phase). The ripple currents at the summed output of the master and slave stages substantially cancel. | 10-25-2012 |
| 20120274226 | METHOD AND DEVICE FOR DRIVING LIGHT-EMITTING DIODE - A device and a method for driving a light-emitting diode include using multiple current guiding control circuits to drive multiple LED modules. Each of the current guiding control circuits includes at least two transistors connected in parallel to constitute at least two switch circuits. Each of the current guiding control circuits permits or prevents electric current to flow to an immediate downstream one of the LED modules in response to a predetermined voltage level of the positive part of a voltage source. The respective the current guiding control circuits are responsive to different voltage levels. As a result, a maximum number of LED modules are driven to emit light at a given voltage level, thereby achieving the purposes of efficiently utilizing electric power and reducing power loss. | 11-01-2012 |
| 20120274227 | ADAPTIVE DIMMER DETECTION AND CONTROL FOR LED LAMP - An LED lamp is provided in which the output light intensity of the LEDs in the LED lamp is adjusted based on the input voltage to the LED lamp. A dimmer control unit detects a type of dimmer switch during a configuration process. Using the detected dimmer type, the dimmer control unit generates control signals appropriate for the detected dimmer type to provide regulated current to the LEDs and to achieve the desired dimming effect. The LED lamp can be a direct replacement of conventional incandescent lamps in typical wiring configurations found in residential and commercial building lighting applications that use conventional dimmer switches. | 11-01-2012 |
| 20120299497 | LED CIRCUIT - There is provided an LED circuit including a light emitting unit including a plurality of light emitting diodes; and a switching unit switching to apply only positive voltage of an AC power supply to an anode of the light emitting unit. Through this, the LED circuit can reduce complexity of a driving circuit. Further, lifespan and efficiency of the LED circuit may be improved since an electrolytic capacitor and a bridge circuit are not used. Further, any one light emitting diode may be prevented from determining the lifespan of all of the light emitting diodes since all of the light emitting diodes are driven at all times, thereby improving the lifespan of the light emitting diode. | 11-29-2012 |
| 20120299498 | POWER CONTROL UNIT - The present invention generally provides a power control unit adapted to provide adjustable levels of a controlled output power signal, such as but not limited to a pulse width modulated signal or a serial binary signal. One embodiment of a power control unit according to the present invention comprises a housing holding internal electronic components. This housing further comprises input and output wiring extending out of the housing and internally connected to the electronic components. The electronic components further comprise circuitry capable of providing at least 2 levels of the controlled output power signal. The present invention also includes lighting systems incorporating a power control unit according to the invention. | 11-29-2012 |
| 20120299499 | SYSTEM AND METHOD FOR SELECTIVELY DIMMING AN LED - Embodiments of the present disclosure include an LED ballast circuit for dimming one or more LEDs using a phase controlled dimmer switch. The LED ballast circuit has a power conditioning unit which includes a substantially fixed duty cycle clock for outputting a clock cycle and a transformer configured to store energy and discharge a substantial portion of the stored energy once per clock cycle in order to power one or more LEDs. | 11-29-2012 |
| 20120306398 | DRIVING APPARATUS, OLED PANEL AND METHOD FOR DRIVING OLED PANEL - The present disclosure relates to a driving apparatus, an OLED (Organic Light-Emitting Diode) panel, and a method for driving the OLED panel. The driving apparatus can be integrated on a substrate of pixel circuits and is capable of providing fast and stable current driving. The driving apparatus includes a switching module for selecting a voltage signal according to a received clock signal; a conversion module for converting the voltage signal into a current signal; and an output module for outputting the voltage signal or the converted current signal to drive a pixel circuit array, wherein the switching module is connected to the conversion module and the output module, and the conversion module is connected to the switching module and the output module. | 12-06-2012 |
| 20120306399 | PROJECTOR SYSTEM WITH SINGLE INPUT, MULTIPLE OUTPUT DC-DC CONVERTER - A projector system with a single DC-DC converter having a single inductor is disclosed. A single DC-DC converter receives an input voltage and connects to two or more light sources such that each light source receives the same DC-DC converter output signal. Connected to the opposite terminal of the light source is a current source driver which receives a control signal control the voltage levels that determine which light source is the active or full power light source in the time multiplexed image generation arrangement. The use of a DC-DC converter having a single inductor reduces cost and size of the system while still enabling color mixing such that two or more light sources share the same single output of the DC-DC converter. | 12-06-2012 |
| 20120319609 | LIGHT EMITTING DIODE DRIVER HAVING OFFSET VOLTAGE COMPENSATING FUNCTION - There is provided a light emitting diode (LED) driver having an offset voltage compensating function compensating for an offset voltage generated at the time of driving of an LED, the LED driver including: a driving unit detecting a current flowing in an LED unit having at least one LED, as a voltage and controlling the current flowing in the LED unit according to a comparison result between the detected voltage and a reference voltage having a preset voltage level; and an offset compensating unit integrating a voltage difference between the detected voltage and the reference voltage and adding or subtracting a compensating current according to an integration result to thereby compensate for an offset. | 12-20-2012 |
| 20120319610 | LED LIGHTING APPARATUS - An LED lighting apparatus includes a series circuit that includes a primary winding P of a transformer T and a switching element Q | 12-20-2012 |
| 20120326617 | ILLUMINATION APPARATUS - An illumination apparatus, for outputting a light of mixed colors in a desired color temperature by controlling light outputs from light sources, includes: a light output setting unit for outputting a set signal presenting a set value for adjusting an output of the light of mixed colors; a first filter for smoothing the set signal from the light output setting unit; a light output adjustment unit for adjusting the light outputs from the respective light sources based on the set signal smoothed by the first filter; and a plurality of second filters smoothing signals outputted from the light output adjustment unit to the light sources, respectively. Each of time constants of the second filters is lower than that of the first filter. | 12-27-2012 |
| 20130002162 | LED BACKLIGHT DRIVING CIRCUIT - A light emitting diode (LED) backlight driving circuit is disclosed in the present disclosure. The LED backlight driving circuit in configured to power an LED backlight module, and comprises: a voltage stabilizing circuit, being configured to receive an input voltage and filter the input voltage to output a stabilized direct current (DC) voltage; a first boost circuit and a second boost circuit connected with the voltage stabilizing circuit respectively, being configured to receive the stabilized DC voltage and boost the stabilized DC voltage for output to the LED backlight module; and a selection control circuit, being configured to alternately select one of the first boost circuit and the second boost circuit to power the LED backlight module. The LED backlight driving circuit of the present disclosure can improve the voltage boosting efficiency and reduce the cost, so it is of great utility. | 01-03-2013 |
| 20130009561 | CIRCUITS FOR SENSING CURRENT LEVELS WITHIN A LIGHTING APPARATUS INCORPORATING A VOLTAGE CONVERTER - Circuits for sensing current levels within an apparatus are disclosed. In specific cases, a constant voltage power supply is used to power an LED lighting apparatus in which there are uncertainties within the forward voltages of the LEDs, which in turn creates uncertainty with respect to the current level flowing through the LEDs. To manage these uncertainties, the current flowing through the LEDs is measured by determining a voltage level across a known resistor and calculating the current level. To prevent the known resistor from causing a significant reduction in the efficiency of the overall light engine, the circuit includes one or more transistors in parallel with the known resistor to reduce the effective resistance in the LED circuit during times that the current is not being sensed. | 01-10-2013 |
| 20130009562 | METHOD AND DEVICE FOR DRIVING A GAS DISCHARGE LAMP - A method for operating a fluorescent lamp ( | 01-10-2013 |
| 20130020956 | CORRELATED COLOR TEMPERATURE CONTROL METHODS AND DEVICES - New and useful methods and systems for providing lighting control are disclosed. For example, in an embodiment a lighting system includes one or more first solid state lights having a first aesthetic color, one or more second solid state lights having a second aesthetic color, the second aesthetic color having an appreciably longer wavelength than the first aesthetic color, and an amplitude correlation circuit configured to control a ratio of first light produced by the one or more first solid state lights to second light produced by the one or more second solid state lights as a function of a received dimming control signal. | 01-24-2013 |
| 20130020957 | CIRCUIT ARRANGEMENT AND METHOD FOR OPERATING AT LEAST ONE LED - A circuit arrangement for operating an LED may include a switching controller with an output for coupling to the LED; a short-circuiting switch with a control electrode, it being possible for the short-circuiting switch to be connected in parallel with an LED; and a control device with a radiation signal input for supplying a radiation signal and a first output, which is coupled to the control electrode of the short-circuiting switch; wherein the switching controller includes a start/stop input for starting the switch controller, it being possible for the control device to furthermore include a second output which is coupled to the start/stop input of the switching controller, it being possible for the control device to be designed to supply a start/stop signal at its second output for starting and stopping the switching controller depending on the radiation signal. | 01-24-2013 |
| 20130020958 | LED DRIVER OPERATING IN BOUNDARY CONDITION MODE - An LED driver for controlling a current supplied to an LED fixture, the LED driver including a switched mode power supply (SMPS) for providing the current to the LED array and a control unit for controlling a switch of the SMPS. The control unit includes an input terminal connected to a current sensing circuit and the switch is connected to the LED fixture at a node downstream of the LED fixture. The current sensing circuit of the LED driver provides a feedback signal to the input terminal of the control unit; the current sensing circuit including a current sensor arranged to provide, when the switch is closed, the feedback signal representing a level of the current supplied to the LED fixture; the current sensing circuit further providing the feedback signal indicating a zero-crossing of the current supplied to the LED fixture when the switch is open. | 01-24-2013 |
| 20130033190 | Intelligent User Interface Including A Touch Sensor Device - The present invention, according to a preferred embodiment, is directed to portable electronic devices which operate on exhaustible power sources, for example, batteries. The electronic devices of the present invention comprise at least one signal switch and a microchip in communication with the switch wherein the switch is only capable of transmitting a signal to the microchip that the switch has been activated or deactivated. The microchip is in communication with the exhaustible power source of the electronic device and controls (i) the power on/off function of the device, (ii) at least one other function of the device in response to activation and deactivation signals from the switch, and (iii) an automatic shut off function in response to the receipt of an activation signal from the switch. | 02-07-2013 |
| 20130043801 | LIGHTING DEVICE - A lighting device includes a lighting part, a switching part and a luminance fine-tuning part. The lighting part at least includes a first light emitting diode unit for outputting light with a first color temperature and a second light emitting diode unit for outputting light with a second color temperature. The switching part is coupled with a power source. By changing the number of times the switching part is turned on, the light with desired color temperature and luminance is produced by the lighting part according to the user's requirements. By operating the luminance fine-tuning part, the selected luminance is slightly increased or decreased. | 02-21-2013 |
| 20130076260 | LIGHT-EMITTING SYSTEM HAVING A LUMINOUS FLUX CONTROL DEVICE - A light-emitting system includes first and second solid-state light-emitting components, a current source providing a constant current through the second solid-state light-emitting component, a first instrumentation amplifier detecting a second forward voltage across the second solid-state light-emitting component so as to generate a first detection voltage having a magnitude dependent on the second forward voltage, a compensation voltage module operable to generate a compensation voltage having a magnitude related to the second forward voltage according to the first detection voltage and two reference voltages, and a power control module detecting a first forward voltage across the first solid-state light-emitting component and providing a driving current therethrough that is dependent on the compensation voltage and the first forward voltage and that varies according to ambient temperature. | 03-28-2013 |
| 20130082618 | SYSTEM, METHODS, AND DEVICES, FOR INAUDIBLE ENHANCED PWM DIMMING - Systems and methods for inaudible enhanced pulse width modulation (PWM) backlight dimming are provided. By way of example, an electronic display backlight system according to the present disclosure may include a backlight element and backlight driver circuitry. The backlight driver circuitry may drive the backlight element at various brightness levels using at least two individual duty cycles that occur immediately after one another. The backlight driver circuitry may vary the individual duty cycles such that none will ever reach 100% unless all are 100%, thereby preventing the occurrence of audible noise that might otherwise arise if an “on” PWM period from one individual duty cycle continued into the next. | 04-04-2013 |
| 20130088163 | DISPLAY DEVICE, INVERTER APPARATUS AND METHOD OF DRIVING LAMPS - A display device including two or more lamp groups, each having one or more lamps, includes a driving control signal generating unit and an inverter unit. The driving control signal generating unit generates driving control signals to control the driving of at least one of the two or more lamp groups. The inverter apparatus includes two or more inverter circuits configured to receive the driving control signals. In the display device, each of the two or more inverter circuits sets the operation frequency of a corresponding lamp group based on the driving control signals, and generates an operation voltage for the corresponding lamp group according to the set operation frequency. | 04-11-2013 |
| 20130088164 | ILLUMINATION SYSTEM, AND DRIVING DEVICE AND SIGNAL TRANSMITTER DEVICE THEREOF - An illumination system includes: a signal receiver device configured to, in response to a coupling signal, generate a receiver-side signal frame including a control code portion based on control information of the coupling signal; a code extracting unit operable to extract the control code portion from the receiver-side signal frame; and a current providing unit operable to provide a driving current through a light emitting component according to the control code portion extracted from the code extracting unit. The driving current has a magnitude dependent on the extracted control code portion. | 04-11-2013 |
| 20130093343 | METHOD, APPARATUS AND COMPUTER-READABLE MEDIA FOR CONTROLLING LIGHTING DEVICES - A method for controlling pulse width modulated lighting devices within a lighting apparatus comprising a plurality of sets of lighting devices is disclosed. The method includes setting a counter for a first set of the plurality of sets of lighting devices using a master counter and an activation duration for one or more other sets of the plurality of sets of lighting devices. The method further includes determining an activation time period within a duty cycle for the first set of lighting devices using the counter for the first set of lighting devices and an activation duration for the first set of lighting devices. In some embodiments of the present invention, the lighting devices are light emitting diodes grouped into sets (or banks) and controlled to limit the magnitude and/or quantity of instantaneous current fluctuations in a power supply within the lighting apparatus. | 04-18-2013 |
| 20130093344 | LAMPS AND CONTROL CIRCUIT - An embodiment of the invention provides a lamp comprising a first emitting device, a second emitting device, and a control signal generation device. The control signal generation device generates a first control signal and a second control signal to control the first emitting device and the second emitting device, so that a first light flux generated by the first emitting device is equivalent to a second light flux generated by the second emitting device, wherein the second control signal is generated according to the first control signal. | 04-18-2013 |
| 20130093345 | EFFICIENT ELECTRICALLY-ISOLATED POWER CIRCUITS WITH APPLICATION TO LIGHT SOURCES - Solid state light sources are compatible with AC phase-cut dimmers. The light sources may have switching mode power supplies having primary and secondary sides that are in first and second circuit parts that are electrically isolated from one another. Information regarding a waveform of input electrical power is extracted in the first circuit part and passed to a controller in the second circuit part by way of a galvanic isolator. Additional isolated paths may be provided to provide bi-directional exchange of information between the first and second circuit parts and/or to provide for the exchange of additional information relevant to control. The signal path from the first side to the second side may have a low latency. | 04-18-2013 |
| 20130093346 | COMPENSATION CIRCUIT FOR CURRENT PEAKING REDUCTION IN NOTIFICATION APPLIANCES - A system and apparatus to reduce current peaking in notification appliances are described. The apparatus may include a current peaking compensation circuit comprising two or more transistors and one or more capacitors configured to reduce a start-up frequency of a pulse-width modulated signal during a first time period and to add a time constant decaying voltage across a resistor divider network to increase a reference voltage during the first time period. Other embodiments are described and claimed. | 04-18-2013 |
| 20130099690 | LED DRIVING APPARATUS, METHOD FOR DRIVING LED, AND DISPLAY APPARATUS THEREOF - A display apparatus is provided. The display apparatus includes a display panel which displays an image, a LED module which provides backlight to the display panel, a LED driving unit which selectively uses current of an inductor to apply driving voltage to the LED module, a sensing unit which senses a current value of the inductor, and a switching control unit which adjusts the driving voltage according to sensing result by the sensing unit. | 04-25-2013 |
| 20130099691 | SEMICONDUCTOR LIGHT EMITTING ELEMENT DRIVE DEVICE AND LIGHTING FIXTURE WITH THE SAME - If a dimming ratio of a light source unit is higher than a first ratio, an ON width of a first switching device is increased with a second switching device kept off when the dimming ratio is increased, and also the ON width of the first switching device is decreased with the second switching device kept off when the dimming ratio is decreased. If a dimming ratio of the light source unit is lower than the first ratio, the ON width of the second switching device is regulated with the ON width of the first switching device held at a lower limit. | 04-25-2013 |
| 20130106304 | DEVICE AND METHOD FOR DRIVING LEDS | 05-02-2013 |
| 20130106305 | Light emitting apparatus and method of manufacturing and using the same | 05-02-2013 |
| 20130119881 | LED LIGHTING SYSTEMS AND METHODS FOR CONSTANT CURRENT CONTROL IN VARIOUS OPERATION MODES - System and method for providing at least an output current to one or more light emitting diodes. The system includes a control component configured to receive at least a demagnetization signal, a sensed signal and a reference signal and to generate a control signal based on at least information associated with the demagnetization signal, the sensed signal and the reference signal, and a logic and driving component configured to receive at least the control signal and output a drive signal to a switch based on at least information associated with the control signal. The switch is connected to a first diode terminal of a diode and a first inductor terminal of an inductor. The diode further includes a second diode terminal, and the inductor further includes a second inductor terminal. | 05-16-2013 |
| 20130119882 | SYSTEM AND METHOD FOR DRIVING LIGHT EMITTING DIODES - A system having an alternating current (AC) driven LED unit, an AC voltage regulator, and a controller is provided. The AC driven LED unit includes a first LED and a second LED coupled in reverse parallel. The AC voltage regulator is operable to receive AC voltage originating from an AC voltage source, regulate the AC voltage according to control signals from the controller, and apply regulated AC voltage to the AC driven LED unit, so as to enable the first LED and the second LED to emit light according to the regulated AC voltage. In addition, a method is provided for driving the LED by regulating the AC voltage. By regulating the AC voltage using the AC voltage regulator, benefits of restraining voltage fluctuations, reducing THD, improving power factor, providing dimming control, and mitigating flicker phenomenon can be achieved. | 05-16-2013 |
| 20130119883 | BUCK CONVERTER AND METHOD FOR PROVIDING A CURRENT FOR AT LEAST ONE LED - A converter for providing a current for an LED includes: a buck diode, a buck inductor and a buck switch; and a first auxiliary switch, wherein the buck switch and the buck diode are coupled in series, wherein the buck inductor is coupled between the interconnection point between the buck diode and the buck switch, on one side, and a first output connection, on the other side. A reference electrode of the first auxiliary switch is coupled to a second node, at which a second voltage can be provided, which second voltage is correlated with the current provided to the LED, wherein the first auxiliary switch is coupled to the buck switch such that the disconnection time of the buck switch is fixed by the first voltage and the switch-on time of the buck switch is fixed by the sum of the first voltage and the second voltage. | 05-16-2013 |
| 20130127359 | Operating Device for Light-Emitting Means for Determining an Energy or Power Consumption and Method for Detecting Same - Exemplary embodiments represent an operating device ( | 05-23-2013 |
| 20130127360 | DYNAMICALLY CONTROLLABLE DRIVE CIRCUIT FOR PARALLEL ARRAY OF LIGHT EMITTING DIODES - The present invention relates to a parallel light emitting diode (“LED”) drive circuit and provides a drive circuit configured to drive a parallel array of LEDs. The drive circuit comprises: a switching control signal generator, a plurality of switches, a plurality of sampling resistors, and a plurality of chopper amplifiers. Each switch is coupled to a respective LED in the LED array. Each chopper operational amplifier configured to receive a reference voltage and a switching control signal generated by the switching control signal generator and generate an input offset voltage. Each chopper operational amplifier includes a differential amplifier including an input transistor pair and a current mirror transistor pair, of which the electrical positions can be reserved when the switching control signal is switched between a first state and a second state, wherein the offset voltage, which causes the lightness mismatching in a parallel LED circuit, can be cancelled. | 05-23-2013 |
| 20130147379 | SYSTEMS AND METHODS FOR REGULATING LED CURRENTS - System and method for regulating one or more currents. The system includes a system controller, an inductor, a first resistor, a switch and a first diode. The system controller includes a first controller terminal and a ground terminal, the system controller being configured to output a drive signal at the first controller terminal. The inductor includes a first inductor terminal and a second inductor terminal, the first inductor terminal being coupled to the ground terminal, the second inductor terminal being coupled to one or more light emitting diodes. The first resistor includes a first resistor terminal and a second resistor terminal, the first resistor terminal being coupled to the ground terminal. The switch is configured to receive the drive signal and coupled to the second resistor terminal. The first diode includes a first diode terminal and a second diode terminal and coupled to the first resistor. | 06-13-2013 |
| 20130147380 | Lighting Devices Including Boost Converters To Control Chromaticity And/Or Brightness And Related Methods - A solid state lighting device may include a power supply, a light emitting device, and a boost converter. The boost converter may have an input node electrically coupled to the power supply and an output node with the light emitting device electrically coupled between the output node and a reference node. The boost converter may include a switch electrically coupled in a current shunting path between the input node and the reference node, and a controller. The switch may be configured to shunt current from the power supply around the light emitting device. The controller may be configured to generate a pulse width modulation (PWM) signal to control a duty cycle of the switch to provide a pulse width modulated electrical current through the switch and a continuous electrical current through the light emitting device. Related methods are also discussed. | 06-13-2013 |
| 20130147381 | DRIVING CIRCUIT AND DRIVING METHOD FOR LIGHT EMITTING DIODE AND DISPLAY APPARATUS USING THE SAME - The present invention provides a driving circuit and a driving method for light-emitting diodes (LEDs), and a display apparatus using the same. The driving circuit comprises a power switch and a dimmer circuit. The method comprising: detecting a duty of a pulse width modulation (PWM) dimming signal; and when the duty of the PWM dimming signal is less than the predetermined duty, providing an analog dimming signal to the driving circuit. The present invention can be applicable to a display apparatus, and improve a noise problem when a duty of a conventional dimming is too low. | 06-13-2013 |
| 20130147382 | LED DRIVER APPARATUS - A light emitting diode (LED) driver apparatus is provided. The LED driver apparatus includes an input unit, a PWM signal generation unit, a DC-DC converter, an LED driving unit, and a synchronization unit. The input unit is configured to receive a dimming signal. The PWM signal generation unit is configured to generate a PWM signal using an oscillator having a preset frequency. The DC-DC converter is configured to provide a driving voltage to an LED array using the generated PWM signal. The LED driving unit is configured to drive the LED array using the received dimming signal. The synchronization unit is configured to reset the oscillator based on a driving state of the LED array. | 06-13-2013 |
| 20130147383 | Active Enclosure for Computing Device - A computing device is disclosed. The computing device includes a housing having an illuminable portion. The computing device also includes a light device disposed inside the housing. The light device is configured to illuminate the illuminable portion. | 06-13-2013 |
| 20130154494 | ELECTRONIC DEVICE FOR DRIVING LIGHT EMITTING DIODES - The present invention relates to an electronic device for driving a light emitting diode, which includes a switch (Ts) being adapted to switch a switch-mode power converter, and controlling means (CNTL) being adapted for controlling the switch (Ts) in response to a sensing value (Vs) indicative of a current of the switch-mode power converter and for controlling by the switch (Ts) the output voltage of the switched power converter and a current (Tout) through the light emitting diode. | 06-20-2013 |
| 20130154495 | Adaptive Current Control Timing and Responsive Current Control for Interfacing with a Dimmer - In at least one embodiment, an electronic system adapts current control timing for half line cycle of a phase-cut input voltage and responsively controls a dimmer current in a power converter system. The adaptive current control time and responsive current control provides, for example, interfacing with a dimmer. The electronic system and method include a dimmer, a switching power converter, and a controller to control the switching power converter and controls a dimmer current. In at least one embodiment, the controller determines a predicted time period from a zero crossing until a leading edge of a phase-cut input voltage and then responsively controls the dimmer current to, for example, reduce current and voltage perturbations (referred to as “ringing”), improve efficiency, and reduce an average amount of power handled by various circuit components. | 06-20-2013 |
| 20130154496 | MULTI-MODE FLYBACK CONTROL FOR A SWITCHING POWER CONVERTER - In at least one embodiment, an electronic system and method includes a controller to control a switching power converter in at least two different modes of operation depending on whether the controller detects a dimmer or not and/or whether a load requests more power than either of the two operational modes can provide. In at least one embodiment, the controller detects whether a dimmer is phase cutting an input voltage to a switching power converter. The controller operates the switching power converter in a first mode if the dimmer is detected, and the controller operates the switching power converter in a second mode if the dimmer is not detected. The controller also transitions between operating the switching power converter in the first mode and the second mode if a status of detection of the dimmer changes. | 06-20-2013 |
| 20130154497 | LIGHTING DEVICE AND ILLUMINATION APPARATUS INCLUDING SAME - A lighting device includes a voltage conversion circuit having at least a switching element connected to a positive potential side of the output terminals of the DC power source unit, and a drive unit which outputs a drive signal to the switching element. The drive unit has a first impedance element with a first impedance which is determined based on a power consumed by the drive unit before a predetermined time has elapsed after a control power source is supplied. A control capacitor for use in generating the drive signal is charged when the switching element is turned off during an on/off operation of the switching element. The lighting device further includes a second impedance element with a second impedance having a resistance component, which is arranged in a path in which the control capacitor can be charged in DC when the switching element does not perform the on/off operation. | 06-20-2013 |
| 20130154498 | BACKPLANE DEVICE - The present invention relates to a backplane device for a light source matrix. A light source is preferably a LED or an OLED. A pixel circuitry of the backplane device is assigned to a light source of the light source matrix for controlling the light source. One light source and one pixel circuitry constitute a pixel. The pixels of the light source matrix are classified according to a pixel characteristic. The order of switching the light sources on and/or off depends on the pixel characteristic and not necessarily on the location of the pixel on the backplane device. A current being applied to the light sources is controlled by at least one driver. The at least one driver is electrically connectable to at least one pixel. The at least one driver is not belonging to the pixel circuitry of the pixel. | 06-20-2013 |
| 20130162159 | POWER SUPPLY DEVICE FOR CHARGE PUMPING - A power supply device includes; first/second boost circuits that boost voltages applied to a first/second boost nodes in response to a first/second main signals, and respectively operated first/second transmission unit that control provision of boosted voltages to an output node. The power supply device also includes a bulk voltage controller connected between the boosted nodes and controlling a connection between the output node and a bulk node in response to a bulk control signal. Voltages respectively applied to the first and second transmission units are determined in response to an output node voltage, as well as the first/second main signals. | 06-27-2013 |
| 20130162160 | TELEHEALTH WIRELESS COMMUNICATION HUB DEVICE AND SERVICE PLATFORM SYSTEM - A display circuit includes a first pulse width modulated (PWM) signal line coupled to a first switch, a second PWM signal line coupled to a second switch and the signal line, a transistor coupled to the second signal line between the first signal line and the second switch, a third switch coupled to a third PWM signal line, a fourth switch coupled to a fourth PWM signal line, a fifth switch coupled to a fifth PWM signal line, a light emitting diode (LED) including a red element coupled between the first and third switches, a green element coupled between the first and fourth switches, and a blue element coupled between the first and fifth switches, and an LED including a red element coupled between the second and third switches, a green element coupled between the second and fourth switches, and a blue element coupled between the second and fifth switches. | 06-27-2013 |
| 20130162161 | APPARATUS FOR CONTROLLING AN ILLUMINATION DEVICE AND METHOD FOR CONTROLLING AN ILLUMINATION DEVICE - The invention relates to an apparatus for controlling an illumination device, particularly in an aircraft, which comprises the following: a light source ( | 06-27-2013 |
| 20130169181 | HIGH GATE VOLTAGE GENERATOR AND DISPLAY MODULE INCLUDING THE SAME - A high gate voltage generator and a display module are provided. The high gate voltage generator includes a pulse width modulation (PWM) signal generating circuit, a boost circuit, and an amplifier circuit. The PWM signal generating circuit is used for outputting a PWM signal. The boost circuit is electrically connected to the PWM signal generating circuit and used for receiving an input voltage to boost the input voltage according to the PWM signal and then outputting a power voltage. The amplifier circuit is electrically connected to the boost circuit and used for receiving a reference voltage to amplify the power voltage and then outputting a high gate voltage. The reference voltage is greater than the high gate voltage and is provided by a backlight module electrically connected to the amplifier circuit. | 07-04-2013 |
| 20130181628 | LED LIGHTING DEVICE AND DRIVING METHOD FOR THE SAME - It is provided an LED lighting device calibratable to 0 to 100% of wide range about a chromaticity and luminance of a illumination light by a simple configuration, and a driving method for the LED lighting device. The LED lighting device is provided with a first light-emitting unit and a second light-emitting unit differing a color temperature mutually, and a control circuit for executing a cyclic light/quench control of the first light-emitting unit and the second light-emitting unit, and for executing a light control of the first light-emitting unit and the second light-emitting unit by a PNM (Pulse Number Modulation) control in a fixed cycle so as to have a lighting period Ton for lighting/quenching the first light-emitting unit and the second light-emitting unit complementarily, and a quenching period Toff for quenching both the first light-emitting unit and the second light-emitting unit. | 07-18-2013 |
| 20130193864 | LED DIMMING CIRCUIT FOR SWITCHED DIMMING - A light emitting diode (LED) dimming module includes an energy storage circuit, a load interface circuit, and a switch circuit. The energy storage circuit provides a substantially continuous current in response to a converter current. The load interface circuit provides a modulated load current in response to the continuous current. The switch circuit, which is operatively coupled to the load interface circuit, switches in accordance with a duty cycle. The modulated load current is based on the duty cycle. | 08-01-2013 |
| 20130200814 | LED LIGHTING APPARATUS AND DIMMING METHOD THEREOF - An LED lighting apparatus and a dimming method thereof are disclosed. The LED lighting apparatus is coupled to a power source through a power switch. The method includes providing a first lighting unit and a second lighting unit; detecting whether or not the power switch has been turned on; and gradually adjusting a light mixing ratio between the first lighting unit and the second lighting unit according to a turn-on duration of the power switch and storing a color temperature value, accordingly. | 08-08-2013 |
| 20130207563 | POWER SUPPLY DEVICE AND LIGHTING DEVICE AND LIGHTING FIXTURE USING THE SAME - A power supply device comprises: a DC power supply section that outputs a DC voltage; a voltage conversion section that supplies a DC power to a load by ON/OFF drive of a switching element; a resistor; a control section that performs the ON/OFF drive of the switching element; and an auxiliary winding. The control section comprises: a calculation section that calculates a drive period of the switching element; a count section compares a calculation result obtained in the calculation section with an upper limit value of the drive period; and a flip-flop. When the calculation result is shorter than the upper limit value, the flip-flop sets the drive period, using the calculation result. When the calculation result is longer than the upper limit value, the flip-flop sets the drive period, using the upper limit value. | 08-15-2013 |
| 20130221866 | ILLUMINATING DEVICE - An illuminating device comprising a plurality of semiconductor light-emitting devices differing in emission color and employing a semiconductor light-emitting element and a phosphor, wherein outputted light is stably combined, separation of light is inhibited, and color tone is variable, and which devices emit light outward on the basis of an emission from the semiconductor light-emitting element and from the phosphor which is excited by emission from the semiconductor light-emitting element to fluoresce or on the basis of emission from the phosphor which is so excited to fluoresce, the deviation duv of which from a blackbody radiation locus being within a range of −0.02≦duv≦0.02, in the uv chromaticity diagram according to UCS (u,v) color system (CIE 1960), and outputted lights from the light-emitting part in which the plurality of kinds of the semiconductor light-emitting devices are integrated and arranged, are mixed together and emitted outward. | 08-29-2013 |
| 20130229125 | TUNABLE MULTI-LED EMITTER MODULE - A light-emitting diode (LED) emitter module includes a substrate having a plurality of base layers of an electrically insulating material, a plurality of electrical contacts disposed on a top one of the base layer, and a plurality of electrical paths coupled to the electrical contacts, wherein at least a portion of the plurality of electrical paths is disposed between the base layers. The emitter module also includes two or more groups of light-emitting diodes (LEDs), each group having one or more LEDs, and each of the LEDs is coupled to an electrical contact. The electrical paths are configured for feeding separate electrical currents to the groups of LEDs. The emitter module also includes a memory device containing information associating a plurality of output light colors with a corresponding plurality of combinations of electrical currents, each combination specifying an electric current for each of the two or more groups of LEDs. | 09-05-2013 |
| 20130241427 | POWER DISSIPATION MONITOR FOR CURRENT SINK FUNCTION OF POWER SWITCHING TRANSISTOR - The embodiments disclosed herein describe a method of a power controller for monitoring for unsafe operating conditions of a drive transistor in a switching power converter of a LED lamp system by predicting the power dissipation of the drive transistor based on knowledge of the current through the drive transistor and a continuous observation of the voltage across the drive transistor. When the drive transistor approaches unsafe operating conditions, the power controller turns off the drive transistor. | 09-19-2013 |
| 20130241428 | LED ILLUMINATION APPARATUS AND LED ILLUMINATION SYSTEM - An LED lighting apparatus connected to a power source via two electric lines, includes first and second LEDs having different emission spectrum or chromaticity, a switching unit to monitor ON time length of power supplied from the two electric lines periodically to switch a control mode of the first and second LEDs between first and second modes as a condition that the ON time is not changed continues for more than a threshold value, a first control unit to determine, in the first mode, a total amount of average current to be supplied to the first LED and to the second LED depending on the ON time length of the electric power, and a second control unit to determine, in the second mode, a ratio of average currents to be supplied to the first LED and to the second LED depending on the ON time length. | 09-19-2013 |
| 20130257305 | LIGHT EMITTING DIODE DRIVING APPARATUS - There is provided a light emitting diode driving apparatus satisfying regulations for current transferred to a light emitting diode. The light emitting diode driving apparatus includes: a power supplying unit receiving input power to convert the input power into a preset driving power and supplying the driving power to a light emitting diode unit including at least one light emitting diode; a detecting unit receiving the driving power supplied to the light emitting diode unit to detect voltage flowing in the light emitting diode unit; a controlling unit comparing detection voltage detected by the detecting unit with a preset reference voltage to control a power conversion operation of the power supplying unit; and a driving unit driving the power conversion operation according to controlling by the controlling unit. | 10-03-2013 |
| 20130257306 | CIRCUIT INCLUDING POWER CONVERTER - In at least one embedment, a circuit includes an input node, an energy node, a reference node, an output node, a first capacitive device, a first diode device, and a power converter. The first capacitive device is coupled between the energy node and the reference node. The first diode device has an anode coupled to the input node and a cathode coupled to the energy node. The power converter is coupled between the energy node and the output node. | 10-03-2013 |
| 20130271022 | LIGHT EMITTING DIODE (LED) LIGHT SOURCE CONTROL SYSTEM FOR INTELLIGENTIZED LAYER BREEDING - A Light Emitting Diode (LED) light source control system for intelligentized layer breeding, comprises a plurality of LED lamps ( | 10-17-2013 |
| 20130293133 | LIGHT EMITTING DIODE DRIVER APPARATUS - A light emitting diode (LED) driver apparatus includes a pulse-width modulation (PWM) signal generator configured to generate a PWM signal according to a reference voltage. The LED driver apparatus also includes a DC-DC converter configured to provide a driving voltage to LED arrays based on the generated PWM signal, and a LED driver configured to drive the LED arrays through output ports. The LED apparatus includes a detector configured to detect whether the LED arrays are operatively connected to the corresponding output ports. | 11-07-2013 |
| 20130293134 | LED LIGHTING DEVICE AND LED LUMINAIRE - An LED lighting device includes a plurality of kinds of LEDs | 11-07-2013 |
| 20130300305 | Lighting Control System and Method - A lighting system provides for independent control of both the brightness of an LED light fixture and the perceived color of the light emitted by the LED light fixture. The LED light fixture has two LED light sources, a control circuit alternately pulses the two LED light sources and changes relative duty cycles of the light sources to alter a perceived color output of the lighting fixture, in response to a change in a control signal from a controller. Duty cycles of the light sources are a function of the control signal and vary inversely. The LED light fixture also receives a control signal for controlling a current level provided to the LED light sources to independently control the brightness of the lighting system. | 11-14-2013 |
| 20130300306 | CIRCUIT FOR THE OPERATION OF AT LEAST ONE LED - A circuit for operating at least one LED (“driver circuit”) includes input terminals to be connected to an input or operating voltage in the form of a direct current (DC) voltage or a rectified alternating current (AC) voltage, and output terminals to be connected to a load circuit containing the at least one LED. The circuit includes a clocked switch and a control circuit for clocking the switch. The control circuit is in the form of an integrated circuit (IC) and is provided with input and output pins. The control circuit generates a clock signal for the switch depending on at least two actual value signals, such that there is a control loop with the manipulated variable “clocking of the switch.” | 11-14-2013 |
| 20130307431 | SYSTEMS AND METHODS FOR DIMMING CONTROL USING SYSTEM CONTROLLERS - System and method for dimming control. The system includes a system controller, a transistor, and a resistor. The system controller includes a first controller terminal and a second controller terminal. The transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal. The resistor including a first resistor terminal and a second resistor terminal. The first transistor terminal is coupled, directly or indirectly, to the second controller terminal. The first resistor terminal is coupled to the second transistor terminal. The second resistor terminal is coupled to the third transistor terminal. The system controller is configured to receive an input signal at the first controller terminal and to generate an output signal at the second controller terminal. The transistor is configured to receive the output signal at the first transistor terminal and to change between a first condition and a second condition. | 11-21-2013 |
| 20130307432 | SYSTEMS AND METHODS FOR PROVIDING POWER TO HIGH-INTENSITY-DISCHARGE LAMPS - System and method for igniting one or more high-intensity-discharge lamps. A system includes an ignition controller configured to generate one or more signal pulses for a pulse signal during a first predetermined time period and to cause one or more voltage pulses to be applied to the one or more high-intensity-discharge lamps, the pulse signal changing between a first logic level and a second logic level during the first predetermined time period, each of the one or more signal pulses corresponding to a pulse period, the pulse period being no larger than the first predetermined time period. The ignition controller is further configured to, if the one or more high-intensity-discharge lamps are not successfully ignited after the first predetermined time period, stop generating any signal pulse for the pulse signal for a second predetermined time period, the second predetermined time period being equal to or larger than the pulse period. | 11-21-2013 |
| 20130307433 | CONTROL METHOD OF LAMP - The control method comprises the following steps. Firstly, whether a touch event occurs in a control device is determined. Then, responding to a color temperature set and a brightness set from the control device, a first PWM and a second PWM is generated. Then, whether the lamp connects with to the control device is determined. Then, the first PWM and the second PWM is packaged in a color control package if the lamp connects with to the control device. Then, the color control package is transmitted to the lamp in wireless. | 11-21-2013 |
| 20130320874 | LIGHTING APPARATUS HAVING A LIGHTING MEANS COMPRISING AT LEAST ONE LED - The invention relates to a lighting apparatus ( | 12-05-2013 |
| 20130328494 | System and Method for a Delayed Light Switch Network - A delayed light switch system and method is described herein. Such delayed light switch system can comprise a microphone in a first zone, a light switch, and a central computing system that connects to said microphone and said light switch, wherein said central computing system receives an audio signal from said microphone, said audio signal related to a sound detected by said microphone, waits for a delay time to pass, and transmits a first control signal to said light switch to turn said light switch on. | 12-12-2013 |
| 20130334977 | SWITCHED MODE POWER CONVERTER AND METHOD OF OPERATING THE SAME - A switched mode power converter is disclosed, together with a method for operating the same. The power converter is adapted to be operable in the boundary conduction mode, and operation is interruptible in the absence of any load requirement. | 12-19-2013 |
| 20130342124 | AVOID AUDIO NOISE OF A LED DRIVER DURING PWM DIMMING - A LED driver using a PWM signal for dimming control includes a power converter and a current regulator. The power converter provides an output voltage and a load current for a plurality of LEDs. The current regulator provides a load current dependent signal for the power converter to speed up load transient response caused by variation of the load current, to reduce the ripple of the output voltage, and thereby to avoid audio noise during PWM dimming. | 12-26-2013 |
| 20140009077 | LED LIGHTING DEVICE AND ILLUMINATING APPARATUS USING THE SAME - An LED lighting device includes: a resistor R | 01-09-2014 |
| 20140015433 | DRIVING DEVICE - A driving device comprises a first transistor (B | 01-16-2014 |
| 20140021880 | ELECTRIC LIGHTING DRIVER CIRCUIT - An electric lighting driver circuit for driving an illuminating unit to emit light includes a flyback converting unit for converting a DC input voltage to a low ripple DC voltage, and a half-bridge converting unit electrically connected to the flyback converting unit, for converting the low ripple DC voltage to a low frequency, rectangular wave output voltage to drive the illuminating unit to emit light. The flyback converting unit includes a dual-output winding transformer connected to the half-bridge converting unit. The dual-output winding transformer includes a first winding at a primary side of the dual-output winding transformer and a second winding and a third winding at a secondary side of the dual-output winding transformer. The third winding converts leakage inductance attributed to the first winding and the second winding to electrical energy that is provided to the half-bridge converting unit. | 01-23-2014 |
| 20140021881 | MARKING DEVICE AND MARKING SYSTEM - A marking device includes a solid-state light-emitting element as a light source. A plurality of the marking devices are arranged spaced apart from one another, wherein the solid-state light-emitting element is subjected to PWM control and lit at a frequency of 100 Hz to 200 Hz or exceeding 2,000 Hz. | 01-23-2014 |
| 20140021882 | POWER SUPPLY APPARATUS, ELECTRONIC APPARATUS, AND POWER SUPPLY CONTROL METHOD - A power supply apparatus includes a first constant-power power supply that switches and supplies powers of j types (where j is a natural number of two or more), a second constant-power power supply that switches and supplies powers of k types (where k is a natural number of two or more), and a switching controller that selects and switches on the first and second variable-power power supplies, excluding power transition periods thereof, to supply a load with a constant power. | 01-23-2014 |
| 20140028213 | ACTIVE THERMAL PROTECTION FOR SWITCHES - A system and method include a controller that reduces power dissipated by a switch, such as a source-controlled field effect transistor, when an estimated amount of power dissipated by the switch exceeds a predetermined threshold. Reducing the power dissipated by the switch prevents damage to the switch due to overheating. The controller determines the estimated amount of power dissipated by the switch using actual drain-to-source current and drain voltage data. In at least one embodiment, the controller includes a fail-safe, estimated power dissipation determination path that activates when the drain voltage data fails a reliability test. Additionally, in at least one embodiment, the controller includes a model of thermal characteristics of the switch. In at least one embodiment, the controller utilizes real-time estimated power dissipation by the switch and the model to determine when the estimated power dissipated by the switch exceeds a power dissipation protection threshold. | 01-30-2014 |
| 20140035478 | THIN FILM TRANSISTOR AND MANUFACTURING METHOD THEREFOR, AND DISPLAY DEVICE - The invention provides a thin film transistor having current driving force that can be substantially improved. By heat treatment, the IGZO layer ( | 02-06-2014 |
| 20140042924 | CIRCUIT WITH ADJUSTABLE PHASE DELAY AND A FEEDBACK VOLTAGE AND METHOD FOR ADJUSTING PHASE DELAY AND A FEEDBACK VOLTAGE - A circuit with adjustable phase delay and a feedback voltage includes a delay setting unit and a phase delay signal generator. The delay setting unit generates a delay time according to an external resistor. The phase delay signal generator includes a plurality of phase delay units. Each phase delay unit includes an edge trigger subunit and a signal generation subunit. The edge trigger subunit receives an input signal, and generates a positive edge trigger signal and a negative edge trigger signal according to a positive edge and a negative edge of the input signal, respectively. The signal generation subunit generates and outputs a phase delay signal according to the positive edge trigger signal, the negative edge trigger signal, and the delay time. The phase delay signal lags the input signal for the delay time. | 02-13-2014 |
| 20140049178 | LIGHTING LAMP - The present invention discloses a lighting lamp ( | 02-20-2014 |
| 20140049179 | LIGHT EMITTING DEVICE CONTROL CIRCUIT DEVICE AND CONTROL METHOD OF THE CONTROL CIRCUIT DEVICE - The light emitting device control circuit device | 02-20-2014 |
| 20140055054 | LIGHT DEVICES HAVING CONTROLLABLE LIGHT EMITTING ELEMENTS - In some embodiments, a light device for generating light includes light emitting diodes (LEDs), and power supply circuitry including at least one switching regulator including switching elements to provide power to the LEDs. The light device includes a device support structure including a device connector and an LED support to support the LEDs, wherein the device connector is one end of the device support structure, and the power supply circuitry is supported by the device support structure. Other embodiments are described. | 02-27-2014 |
| 20140062326 | APPARATUS AND METHOD FOR DRIVING LIGHT SOURCE IN BACKLIGHT UNIT - An apparatus for driving a light source of a backlight unit includes: light sources; and a light source driver operating in an idle mode according to an input dimming signal and reducing a dimming value of an output dimming signal for adjusting brightness of the light sources by stages by mixing PWM control and PWM count control in a time-series manner to thus implement low dimming in the idle mode, wherein the dimming value of the output dimming signal is lowered to a first dimming value through the PWM control during a first period and subsequently lowered to a second dimming value lower than the first dimming value through the PWM count control during a second period that follows the first period. | 03-06-2014 |
| 20140062327 | METHOD AND SYSTEM FOR SHUTTING DOWN A LIGHTING DEVICE - A system and method for operating one or more light emitting devices is disclosed. In one example, the switching of a regulator is ceased in response to a request to stop supplying power to one or more light emitting devices. The approach may reduce power consumption of a lighting system when light is not requested. | 03-06-2014 |
| 20140062328 | DISPLAY DEVICE AND METHOD OF CONTROLLING LIGHT SOURCE - The display device includes a light source, and a control section adapted to generate a composite pulse width modulation signal using PWM1 having a first Duty ratio and PWM2 having a frequency higher than the frequency of PWM1, and control a light emitting state of the light source using the composite pulse width modulation signal. The control section corrects a second Duty ratio based on a difference between an expected value of luminance obtained when making the light source emit light using a virtual pulse width modulation signal, which is obtained by combining PWM1 and a pulse width modulation signal having the second Duty ratio, and a setting value of luminance based on the information related to the luminance of the light source, and then uses the second Duty ratio corrected as the Duty ratio of PWM2. | 03-06-2014 |
| 20140062329 | 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 turning the backlight on and off at a first frequency and turning the backlight on and off at a second frequency. | 03-06-2014 |
| 20140070718 | METHOD AND APPARATUS FOR LED FORWARD VOLTAGE MEASUREMENT FOR OPTIMUM SYSTEM EFFICIENCY - A method and apparatus for optimizing a light emitting diode (LED) operation range is provided. The method comprises the steps of: turning on at least one LED; and then measuring an anode voltage of the at least one LED; then measuring a cathode voltage of the at least one LED. Once the measurements are completed, a forward voltage of the at least one LED is calculated. After the calculation, the at least one LED is turned off and a power multiplier switch threshold is set for that LED based on the measured anode and cathode voltages. | 03-13-2014 |
| 20140070719 | DRIVING CIRCUIT HAVING VOLTAGE DIVIDING CIRCUITS AND COUPLING CIRCUIT FOR CONTROLLING DUTY CYCLE OF TRANSISTOR AND RELATED CIRCUIT DRIVING METHOD THEREOF - A driving circuit includes: a first voltage dividing circuit arranged to generate a first voltage-divided signal according to a supply voltage; a second voltage dividing circuit arranged to generate a second voltage-divided signal according to specific voltage; a coupling circuit coupled between the first voltage dividing circuit and the second voltage dividing circuit, and arranged to couple the first voltage-divided signal into the second voltage-divided signal to generate a coupling signal; and a control circuit arranged to generate a control signal at least according to the coupling signal and a feedback signal to control a duty cycle of a transistor, wherein the feedback is generated by the transistor. | 03-13-2014 |
| 20140091725 | Method of powering flashlight tailcaps - A method for powering two circuits in a portable light that are connected by a single conductive chassis so that each of the two circuits is able to have time shared access to a power source. | 04-03-2014 |
| 20140091726 | Filament Miswire Protection In An Electronic Dimming Ballast - An electronic dimming ballast that accommodates miswiring of fluorescent lamp filaments (e.g., miswiring the corresponding lamp sockets) is disclosed. The electronic dimming ballast may drive a plurality of gas discharge lamps. Each gas discharge lamp may have a respective filament. The electronic dimming ballast, via the filament miswire protection element, may establish the same voltage across a first of the filaments regardless of whether the filaments are wired in series or in parallel. The filament miswire protection element may have an impedance that is approximately equal to an impedance of at least one of the filaments. The filament miswire protection element may include one or more capacitors, inductors, and/or resistors. The filament miswire protection element may include only a capacitor. | 04-03-2014 |
| 20140091727 | Off Peak Powered Lighting System for Offices and Buildings - The off-peak powered lighting system provides light to offices, buildings and structures via banks of LED light fixtures. The off-peak system is electrically coupled to battery power source during peak power cycles and then is coupled to an electrical power grid during off-peak cycles. The banks of LED lights, in the offices, buildings and structures, include LED lighting fixtures, each with a multiplicity of LEDs. The LED banks are controlled by a plurality of control switches. A power cycle switch coupled intermediate the power grid and the control switches. controllably couples the grid to the control switches or couples the battery source to the control switches based upon a control command, generated by a controller which creates off-peak and peak control commands. The controller is either a timer, a programmable time of day, or a remotely controllable element subjected to grid-originated peak commands. | 04-03-2014 |
| 20140091728 | METHOD AND APPARATUS FOR MULTIPLEXING PINS OF AN INTEGRATED CIRCUIT - An integrated circuit within an integrated circuit package, including a configuration module and a timing module. The configuration module configures the integrated circuit using a configure operation performed via N pins of the integrated circuit package, where N is an integer greater than 1. The timing module is configured to control on/off timing of (N*M) light emitting diodes arranged in N columns and M rows connected to the N pins and M pins of the integrated circuit, respectively, where M is an integer greater than 1. During a first period, the configure operation utilizes the N pins. During a second period, the N*M light emitting diodes receive data from the M pins and refresh signals from the N pins. The second period is different than the first period. | 04-03-2014 |
| 20140091729 | LIGHT-EMITTING ELEMENT DRIVING CIRCUIT SYSTEM - A light-emitting element driving circuit system is provided in which a plurality of current paths, in each of which a light-emitting element and a switching element which is controlled to be switched ON and OFF for causing light to be emitted from the light-emitting element are connected in series, are placed in parallel to each other, wherein an ON time of each switching element is adjusted based on a light-emission period which is a period in which the light-emitting elements are caused to emit light in a circulating manner, such that a number of switching operations of each switching element is reduced. | 04-03-2014 |
| 20140103830 | LIGHT-EMITTING MODULE, LED DRIVING CIRCUIT, AND LED DRIVING METHOD - A light-emitting diode (LED) driving circuit is configured for driving at least one group of LEDs. The LED driving circuit includes a constant current source, a pulse width modulation (PWM) element, and at least one pulse frequency modulation (PFM) element. The constant current source is configured for generating a current signal with a constant current value; the PWM element is electrically connected to the constant current source and configured for modulating the current signal to generate a PWM signal corresponding to the current signal; the PFM element is electrically connected between the PWM element and the LED and configured for modulating a frequency width of the PWM signal to generate at least one PFM signal for driving the LED. | 04-17-2014 |
| 20140111110 | PWM CONTROL FOR LEDS WITH REDUCED FLICKER WHEN USING SPREAD SPECTRUM SWITCHING FREQUENCIES - A technique to eliminate perceptible flickering by LEDs being dimmed by PWM pulses is disclosed. A controllable oscillator controls a switching frequency of a converter for supplying a regulated current or regulated voltage. The converter controls a first switch at a switching frequency. A varying second signal level is generated by a spread spectrum control (SSC) circuit for controlling the oscillator to vary the switching frequency during operation. A PWM dimming circuit generates a string of PWM pulses that control a switch in series with the LEDs. The SSC circuit is synchronized with the PWM pulses to generate the same second signal level at a start of each PWM pulse, such that the switching frequency of the converter is forced to be substantially the same at the start of each PWM pulse while the pulse widths are constant. The repeating driving current waveform eliminates perceptible flicker by the LEDs. | 04-24-2014 |
| 20140125243 | LIGHT-EMITTING ELEMENT DRIVING CIRCUIT AND DISPLAY DEVICE - Provided are a light-emitting element driving circuit for controlling luminance of light-emitting elements by using a PWM signal, and a display device including the light-emitting element driving circuit and plural light-emitting elements. The light-emitting element driving circuit includes: a control circuit configured to generate a control signal based on an input PWM signal in which ON-periods alternate with OFF-periods to form pulses; and a light-emitting element driving unit configured to drive the plurality of light-emitting elements by using the control signal. The control signal includes alternating first periods and second periods, where the first periods and the second periods correspond to the ON-periods and the OFF-periods of the input PWM signal, respectively. Each of the first periods includes an ON-period, and each of the second period includes an ON-period. The control signal includes a larger number of frequency components in comparison with frequency components of the input PWM signal. | 05-08-2014 |
| 20140132172 | SYSTEMS AND METHODS FOR DIMMING CONTROL USING TRIAC DIMMERS - System and method for dimming control of one or more light emitting diodes. An example system includes one or more signal processing components configured to receive a first signal associated with a TRIAC dimmer, process information associated with the first signal, determine whether the TRIAC dimmer is in a first condition or a second condition, generate a second signal based on at least information associated with the first signal, and send the second signal to a switch. The one or more signal processing components are further configured to, if the TRIAC dimmer is determined to be in the first condition, generate the second signal to cause the switch to be opened and closed corresponding to a modulation frequency. | 05-15-2014 |
| 20140139131 | LIGHT EMITTING DIODE DRIVING APPARATUS - There is provided a light emitting diode driving apparatus, including: a power supplying unit converting input power into driving power according to a control and supplying the converted driving power to a light emitting diode channel; a driving unit controlling current flowing in the light emitting diode channel according to a pulse width modulation (PWM) dimming signal from the outside; and a controlling unit comparing a reference level set by a duty of the PWM dimming signal with a detection voltage level of the light emitting diode channel and controlling a power converting operation of the power supplying unit according to the comparison result. | 05-22-2014 |
| 20140152188 | WIRELESS LIGHTING CONTROL METHODS - A method for controlling lighting devices includes providing the lighting devices. Each lighting device includes two or more LEDs, an AC/DC or DC/DC power converter, a controller/processor electrically connected to the AC/DC or DC/DC power converter, a light emitting diode (LED) current control circuit communicably coupled to the controller/processor and electrically connected to the AC/DC or DC/DC power converter and the two or more LEDs. One or more control signals are generated using the controller/processor and sending the one or more control signals to the LED current control circuit. An on/off signal having a cycle time for each LED is generated using the LED current control circuit in response to the one or more control signals and sending the on/off signal to each LED. A blended light is produced having a specified color based on how long each LED is turned ON and/or OFF during the cycle time. | 06-05-2014 |
| 20140167634 | Method and Circuit for LED Driver Dimming - An LED driver includes a transformer, current control loop and current adjustment circuit. The primary side of the transformer transfers energy to the secondary side of the transformer responsive to an input signal. The secondary side delivers output current to one or more LEDs at a magnitude corresponding to the amount of energy transferred to the secondary side. The current control loop controls current in the primary side so that the output current equals a reference current signal. The current adjustment circuit injects a current adjustment signal into the current control loop responsive to a phase-cut signal which removes a portion of the input signal. The current control loop also decreases the current in the primary side responsive to the current adjustment signal so that a brightness of each LED connected to the secondary side is decreased by an amount corresponding to the magnitude of the current adjustment signal. | 06-19-2014 |
| 20140175999 | LED LIGHTING DEVICE AND DRIVING METHOD FOR THE SAME - It is provided an LED lighting device calibratable to 0 to 100% of wide range about a chromaticity and luminance of a illumination light by a simple configuration, and a driving method for the LED lighting device. The LED lighting device is provided with a first light-emitting unit and a second light-emitting unit differing a color temperature mutually, and a control circuit for executing a cyclic light/quench control of the first light-emitting unit and the second light-emitting unit, and for executing a light control of the first light-emitting unit and the second light-emitting unit by a PNM (Pulse Number Modulation) control in a fixed cycle so as to have a lighting period Ton for lighting/quenching the first light-emitting unit and the second light-emitting unit complementarily, and a quenching period Toff for quenching both the first light-emitting unit and the second light-emitting unit. | 06-26-2014 |
| 20140184088 | LIGHT SOURCE APPARATUS - A light source apparatus includes a light-emitting module and a control unit. The light-emitting module is for providing a light. The control unit switches the light emitted from the light-emitting module between a first light and a second light, wherein the circadian stimulus value (CS/P value) of the second light is less than CS/P value of the first light, and the color temperatures of the second light and the first light are substantially the same as each other. | 07-03-2014 |
| 20140184089 | LIGHT SOURCE, PULSE CONTROLLER AND METHOD FOR PROGRAMMABALE PULSE GENERATION AND SYNCHRONIZATION OF LIGHT EMITTING DEVICES - An LED (Light Emitting Device) light source ( | 07-03-2014 |
| 20140203723 | Light Emitting Module - A light emitting diode module includes a main base board, a wireless communication module, multiple light emitting diodes, a power output control system and a control unit. The wireless communication module is used for receiving a control signal. The light emitting diodes are disposed on the main base board and include light emitting diodes having at least one color. The power output control system is electrically connected to the light emitting diodes. The power output control system adjusts an amount of current flowing through each light emitting diode to control the light emitting diodes to emit light by adjusting the amount of current. The control unit is electrically connected to the wireless communication module and the power output control system for controlling the power output control' system to adjust the amount of current of each light emitting diode. | 07-24-2014 |
| 20140217914 | PROGRAMMABLE LUMINAIRE AND PROGRAMMABLE LUMINAIRE SYSTEM - A programmable luminaire system may comprise a programmable luminaire comprising an optic defining an optical chamber, a light source comprising a plurality of light-emitting elements, a controller operably coupled with the plurality of light-emitting elements, and an electrical connector electrically coupled with the controller. The system may further comprise a computerized device configured to electrically communicate with the programmable luminaire. The computerized device may be configured to transmit data to the programmable luminaire. The programmable luminaire may be configured to receive the data from the computerized device at the electrical connector. The controller may be configured to be programmed responsive to the data received by the controller. | 08-07-2014 |
| 20140217915 | REGULATION OF WAVELENGTH SHIFT AND PERCEIVED COLOR OF SOLID STATE LIGHTING WITH INTENSITY VARIATION - Representative embodiments of the invention provide a system, apparatus, and method of controlling an intensity and spectrum of light emitted from a solid state lighting system. The solid state lighting system has a first emitted spectrum at a full intensity level and at a selected temperature, with a first electrical biasing for the solid state lighting system producing a first wavelength shift, and a second electrical biasing for the solid state lighting system producing a second, opposing wavelength shift. Representative embodiments provide for receiving information designating a selected intensity level or a selected temperature; and providing a combined first electrical biasing and second electrical biasing to the solid state lighting system to generate emitted light having the selected intensity level and having a second emitted spectrum within a predetermined variance of the first emitted spectrum over a predetermined range of temperatures. | 08-07-2014 |
| 20140217916 | METHOD AND APPARATUS FOR ALTERING A COLOR OF A MIXTURE OF LIGHT PROVIDED BY MIXING OUTPUTS OF LIGHT FROM MULTIPLE LAMPS - A system including first and second lamps, one of an inductor or a transformer, first and second switches, and a control module. The first lamp generates a first output of light having a first color. The second lamp generates a second output of light having a second color. The first and second outputs of light are mixed to provide a mixture of light having a third color. The transformer includes first and second coils. The first and second coils supply power respectively to the first and second lamps. The first and second switches are connected respectively to the first and second coils. The control module alters the third color by controlling (i) a state of the first switch to adjust a first amount of current supplied to the first lamp, and (ii) a state of the second switch to adjust a second amount of current supplied to the second lamp. | 08-07-2014 |
| 20140232283 | DIRECTION INDICATING APPARATUS - To provide a direction indicating apparatus that is less susceptible to a change of a power supply voltage and can reduce the difference in brightness of a direction indicating lamp using an LED element between a direction indicating operation and a hazard operation. A direction indicating apparatus includes a pulse signal generating part, a first switching element, a variable resistor circuit, a direction indicating switch, a hazard switch, first and second direction indicating lamps, a voltage detecting part and a lighting status detecting part. | 08-21-2014 |
| 20140232284 | LED DRIVE CIRCUIT WITH A PROGRAMMABLE INPUT FOR LED LIGHTING - A LED drive circuit according to the present invention comprises a controller and a programmable signal. The controller generates a switching signal coupled to switch a magnetic device for generating an output current to drive a plurality of LEDs. The programmable signal is coupled to regulate a current-control signal of the controller. The switching signal is modulated in response to the current-control signal for regulating the output current, and the level of the output current is correlated to the current-control signal. | 08-21-2014 |
| 20140232285 | DIRECTION INDICATING APPARATUS - To provide a direction indicating apparatus that does not detect a break occurring in an indicator but can detect a break occurring in a direction indicating lamp incorporating an LED element with reliability. The direction indicating apparatus includes a pulse signal generating part, a first switching element, a direction indicating switch, first and second direction indicating lamp units, a break detecting part, a lighting state detecting part, an indicator part and an indicator driving part. | 08-21-2014 |
| 20140252975 | Reduction of Supply Current Variations Using Compensation Current Control - A power distribution system and method includes a controller that is configured to control a switching power converter. In at least one embodiment, the controller includes a compensation current control circuit to control a compensation current that reduces and, in at least one embodiment, approximately eliminates variations in current drawn by the controller during a particular operational time period. In at least one embodiment, the power distribution system is a lamp that includes the controller, a switching power converter, and one or more light sources, such as light emitting diodes. | 09-11-2014 |
| 20140265905 | Switchable Light Bulb Assembly with Integral Power Source - A switchable light bulb assembly with integral power source is disclosed. The assembly has a light bulb, a power supply and a plug cap assembly. The plug cap assembly is configured to provide electrical communication between first and second electrical leads of a conventional light fixture. The light bulb is configured to be threadably insertable into a conventional, AC light fixture and provide electrical communication creating a circuit that can be opened or closed by operating the switch of the conventional light fixture. The power supply provides energy to the bulb when the circuit is closed. | 09-18-2014 |
| 20140265906 | METHODS AND APPARATUS FOR LIGHTING EFFECTS IN A MOVING MEDIUM - A device for creating moving light effects has a light source that is configured to pulse a light ON and OFF according to a desired pattern so as to create a moving light effect that is visible when the light source is moved. Some such devices can be programmed to custom-select color sets that are pulsed ON and OFF according to the desired pattern. Other such devices enable the user to custom select one or more patterns. Some devices can control a duty cycle of and LED of the light source by applying an eight bit octet over each duty cycle time in which the LED is pulsed ON or OFF based on a binary “1” or “0” of the octet. A microlight for use in artistic moving light shows such as gloving can employ such moving light effects, and some such microlights can be operated and programmed using a single actuator button. | 09-18-2014 |
| 20140285104 | Method and Apparatus for Regulating the Brightness of Light-Emitting Diodes - Embodiments of the present invention relate to methods and circuits for brightness regulation for at least one light-emitting diode in the field of general lighting, more particularly, for incandescent lamp replacement by means of a supply voltage comprising a brightness level signal, wherein the brightness level signal contained in the supply voltage is decoded and converted into a modulation signal with a duty cycle corresponding to the brightness level signal for the purpose of driving a driver circuit for the at least one light-emitting diode. | 09-25-2014 |
| 20140285105 | COMMUNICATION PROTOCOL FOR LIGHTING SYSTEM WITH EMBEDDED PROCESSORS AND SYSTEM OPERATING WITH THE PROTOCOL | 09-25-2014 |
| 20140300290 | METHODS AND APPARATUS FOR CONTROLLING A LIGHTING FIXTURE UTILIZING A COMMUNICATION PROTOCOL - Methods and apparatus for controlling a lighting fixture utilizing a communication protocol transmitted over the power line that feeds the lighting fixture. Data may be transmitted to a plurality of lighting fixtures ( | 10-09-2014 |
| 20140300291 | Electronic UE and method for setting shell color thereof - An electronic User Equipment (UE) and a method for setting a shell color thereof are disclosed, so as to solve the limitation of selecting a shell color through a menu in the prior art. The UE acquires color information stored in the UE or color information of an environment around the UE, acquires display color information of each color in the color information and information of three primary colors corresponding to the display color information of each color, obtains switching frequencies of Light Emitting Diode (LED) lamps according to a relationship between the information of the three primary colors corresponding to the display color information of each color and the switching frequencies of the LED lamps in an LED lamp group, and then controls switches and brightness of the LED lamps according to the switching frequencies of the LED lamps, such that a shell provided with the LED lamp group displays a corresponding color. The present disclosure implements to acquire the color of the exterior environment as the shell color of the UE, so that the alterable range of the shell color of the UE may be improved greatly and the limitation to the change in the shell color of the UE due to the geography location may be avoided. | 10-09-2014 |
| 20140312796 | CIRCUIT ARRANGEMENT FOR OPERATING A LOW-POWER LIGHTING UNIT AND METHOD OF OPERATING THE SAME - A circuit arrangement ( | 10-23-2014 |
| 20140327371 | ELECTICAL DEVICE AND METHOD FOR COMPENSATING AN EFFECT OF AN ELECTRICAL CURRENT OF A LOAD, IN PARTICULAR AN LED UNIT, AND DRIVER DEVICE FOR DRIVING A LOAD, IN PARTICULAR AN LED UNIT - Electrical device ( | 11-06-2014 |
| 20140333223 | DIMMABLE LED LIGHT UNIT AND METHOD OF REPLACING A LIGHT UNIT - A dimmable LED light unit, in particular for a passenger transportation vehicle, such as an aircraft, a road vehicle, a ship or a rail car, is disclosed that comprises a power input adapted to receive electrical power from a power source, at least one LED, and an LED drive and control module coupled between the power input and the at least one LED, wherein the LED drive and control module is adapted to receive an LED control signal indicative of a desired light intensity of the dimmable LED light unit. | 11-13-2014 |
| 20140333224 | SWITCHED MODE POWER CONVERTER AND METHOD OF OPERATING THE SAME - A switched mode power converter is disclosed, together with a method for operating the same. The power converter is adapted to be operable in the boundary conduction mode, and operation is interruptible in the absence of any load requirement. | 11-13-2014 |
| 20140339997 | LIGHT EMITTING ELEMENT DRIVE APPARATUS AND PORTABLE APPARATUS USING SAME - A light emitting element drive apparatus capable of outputting the lowest voltage satisfying drive conditions and having high light emitting efficiency and low power loss, and a portable apparatus using the same, comprising an LED drive apparatus to which LEDs of different drive voltages required for emitting light are connected in parallel and driving one or more LEDs, wherein the LED drive apparatus | 11-20-2014 |
| 20140361704 | CIRCUIT ARRANGEMENT AND METHOD FOR OPERATING AND DIMMING AT LEAST ONE LED - A circuit arrangement includes a converter having a converter switch and a driver for the converter switch. The driver includes an interface coupling to a dimming apparatus supplying a dimming value. The driver provides an RF signal with a duty ratio at the output of the driver. The driver modifies the RF signal by superposition of a PWM signal such that, in correlation with the supplied dimming value, a predefinable number of periods of the RF signal is chopped from the RF signal. The driver is configured to reduce the duty ratio of the RF signal during at least one predefinable period of the RF signal in order to adjust levels of dimming which correspond to dimming values which are between a first and a second dimming value which differ from one another by at least one period of the RF signal. | 12-11-2014 |
| 20150008839 | LED BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE LED BACKLIGHT DRIVING CIRCUIT - A light emitting diode (LED) backlight driving circuit includes a power supply, an LED lightbar coupled to the power supply, and a constant current driving chip coupled to a control end of the power supply and coupled to a cathode of the LED lightbar. The constant current driving chip includes an adjusting dimming unit coupled to the cathode of the LED lightbar, and the adjusting dimming unit adjusts an external pulse-width modulation (PWM) dimming signal. A controllable switch unit is connected in series between an output end of the power supply and the constant current driving chip, and logical operation of the controllable switch unit is relative to logical operation of the adjusting dimming unit. The controllable switch unit turns off when the adjusting dimming unit turns off or before the adjusting dimming unit turns off, and the controllable switch unit turns on when the adjusting dimming unit turns on or after the adjusting dimming unit turns on. | 01-08-2015 |
| 20150008840 | METHOD FOR GENERATING A RUNNING LIGHT EFFECT ON AN OPTICAL WAVE GUIDE STRUCTURE AND OPTICAL WAVE GUIDE STRUCTURE - The invention relates to an optical wave guide structure (1) comprising at least one optical wave guide (2, 2′; 11, 12) and at least two light input positions (A . . . E), each of which is associated with a light source (3, 3′; 4, 4′, 4″; 22 | 01-08-2015 |
| 20150015155 | ELECTRONIC DEVICE FOR DRIVING LIGHT EMITTING DIODES - The present invention relates to an electronic device for driving a light emitting diode, which includes a switch (Ts) being adapted to switch a switch-mode power converter, and controlling means (CNTL) being adapted for controlling the switch (Ts) in response to a sensing value (Vs) indicative of a current of the switch-mode power converter and for controlling by the switch (Ts) the output voltage of the switched power converter and a current (Tout) through the light emitting diode. | 01-15-2015 |
| 20150015156 | SIGNAL TRANSMISSION METHOD AND RELATED DEVICE - A method of operating an electrical power supply device having a primary side and a secondary side is provided. The method includes transmitting with an optocoupler arranged between the primary side and the secondary side a wide band control signal and a numerical information signal. The method further includes transmitting the control signal and the information signal over a rectangular-wave signal modulated in combination with frequency modulation and pulse width modulation. The control signal and the information signal are the modulating signals for frequency modulation and pulse width modulation of said rectangular-wave signal. | 01-15-2015 |
| 20150015157 | LCD Display, a Driving Device for Driving the LCD display, and a Driving Method for Driving the LCD Display - The present invention discloses an LCD display and related driving device and driving method. The driving method includes: obtaining an accumulated working time of the LCD display; obtaining a high reference voltage corresponding to the accumulated working time; utilizing the high reference voltage to drive the LCD display; making a multiplying product of a transmittance and a backlight magnitude of the LCD display remain equal or proximity. The present invention suppresses the backlight magnitude decrease phenomenon due to the long-used term of the LCD display such that the display quality can be improved. | 01-15-2015 |
| 20150022110 | CONTROLLED OPERATION OF A LED LIGHTING SYSTEM AT A TARGET OUTPUT COLOR - A method for operating a LED lighting system has three or more LED emitters of different colors. The method allows finding the optimal drive setting for each LED emitter of the system, taking into account a specific target color. The method involves providing calibration data for each LED emitter at a plurality of values of drive setting and junction temperature, and executing a drive recursion loop calculating the drive setting of each emitter based on an input value for the temperature of each emitter and in view of the target output color and of the calibration data. Advantageously, this can be accomplished without measuring the color emitted by the LED lighting system, that is, no color feedback is required. A LED lighting system implementing the method is also disclosed. | 01-22-2015 |
| 20150022111 | LED DEVICE WITH BUILT-IN FAST SELF-TEST CIRCUIT - An LED device with built-in fast self-test circuit includes at least one LED unit, a data shift and latch register, a control unit, at least one multiplexer, and an LED driver unit. The data shift and latch register receives a serial data signal. The control unit receives the serial data signal to detect whether there is normal data transmission based on the serial data signal. When there is no data transmission, the control unit enables a multiplex control signal. The multiplexer is connected to the control unit and the data shift and latch register. According to the multiplex control signal, the multiplexer selects the control unit or the data shift and latch register as an output. The LED driver unit is connected to at least one LED unit and the multiplexer to drive the LED unit based on the output of the multiplexer. | 01-22-2015 |
| 20150022112 | METHOD FOR OPERATING A CIRCUIT CONFIGURATION WITH A CONTROL AND/OR REGULATING MEANS FOR A LIGHT DIODE FIELD - A method for operating a circuit configuration which includes a power source, a light diode field switched serially with the power source in which the light diode field comprises at least two serial circuits including at least one light diode and a switch, a control and/or regulating means for the light diode field, and a voltage sensor. The control and/or regulation means controlling the controllable switches and the power source such that the control and/or regulation means addresses the controllable switch of at least one serial circuit of the light diode field during a clock cycle for a pulse duration determined by the control and/or regulation means using a control pulse at the control input of the controllable switch for closing. The control and/or regulation means addresses the power source shortly before or at the latest simultaneous with the end of a pulse duration such that the current is reduced, namely by the amount of current through the serial circuit. The controllable switch at the end of the pulse duration is addressed by the control and/or regulation means for opening. During subsequent clock cycles the control and/or regulation means switch on only one of the controllable switches of the serial circuits for a period identified as diagnostics period. | 01-22-2015 |
| 20150028762 | PIXEL CIRCUIT AND METHOD FOR DRIVING THE SAME, DISPLAY PANEL AND DISPLAY APPARATUS - A pixel circuit and a method for driving the same, a display panel and a display apparatus are configured to improve the lifespan of the pixel circuit. The pixel circuit comprises: a charging sub-circuit ( | 01-29-2015 |
| 20150028763 | 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 undetected due to possible frequency blind spots in the detection spectrum, the lighting device ( | 01-29-2015 |
| 20150028764 | TWO TERMINAL DRIVE OF BIPOLAR JUNCTION TRANSISTOR (BJT) FOR SWITCH-MODE OPERATION OF A LIGHT EMITTING DIODE (LED)-BASED BULB - A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as for LED-based light bulbs. The BJT may be switched on and off from a controller coupled to two terminals of the BJT. Through the two terminals, the control IC may dynamically adjust a reverse recovery time period of the BJT. The reverse recovery time period may be adjusted by changing an amount of base charge that accumulates on the BJT. Additional, the reverse recovery may be controlled through the use of a reverse base current source applied to the BJT after beginning switching off the BJT. | 01-29-2015 |
| 20150035446 | LIGHTING DEVICE AND LUMINAIRE - A lighting device that lights up an LED and includes a DC power source, a buck converter and a control circuit. The buck converter includes a switching element, an inductor and a diode. The control circuit includes a current detection circuit that detects an electric current flowing through the switching element, a voltage detection circuit that detects a voltage across the inductor, a delay circuit that generates a delay time according to the voltage detected by the voltage detection circuit, and a drive circuit that generates and outputs a control signal to the switching element, the control signal turning OFF the switching element after a lapse of the delay time generated by the delay circuit from when the electric current detected by the current detection circuit reaches a predetermined current command value. | 02-05-2015 |
| 20150042237 | OPERATING CIRCUIT FOR LIGHT EMITTING DIODES AND METHOD FOR OPERATING LIGHT EMITTING DIODES - The invention relates to a method for the operation of at least one light emitting diode ( | 02-12-2015 |
| 20150054419 | LIGHTING DEVICE AND ILLUMINATION APPARATUS USING THE SAME - In first mode, controller is configured, when receiving a dimming instruction signal, to control voltage-adjusting part to provide a DC voltage with a magnitude corresponding to a luminous level, across output ends of DC power supply, and apply a control voltage with a magnitude kept constant to a control terminal of switching element. In second mode, controller is configured, when receiving the dimming instruction signal, to apply the control voltage with a magnitude corresponding to luminous level to the control terminal of switching element, and control voltage-adjusting part to provide the DC voltage with a magnitude kept constant, across the output ends of DC power supply. Controller is configured to operate in one of first and second modes when luminous level is predetermined level or more, and in the other of first and second modes when luminous level is less than predetermined level. | 02-26-2015 |
| 20150054420 | LIGHTING DEVICE AND ILLUMINATION APPARATUS USING THE SAME - A controller has a first mode and a second mode. First mode is of generating a PWM signal that has a duty ratio to be changed according to a luminous level for a light emitting element and has a constant amplitude. Second mode is of generating a PAM signal that has a constant duty ratio and has an amplitude to be changed according to the luminous level for the light emitting element. Controller is configured to apply one of PWM signal in first mode and PAM signal in second mode to a control terminal of a switching element, when the luminous level is a predetermined level or more. Controller is configured to apply the other of PWM signal in first mode and PAM signal in second mode to the control terminal of the switching element, when the luminous level is less than the predetermined level. | 02-26-2015 |
| 20150061528 | Driver Circuit Using Dynamic Regulation and Related Techniques - An LED driver circuit selects a regulated voltage value for use in driving one or more LEDs based on dimming duty cycle. In some embodiments, the regulated voltage value may be selected in accordance with a function that decreases monotonically with increasing dimming duty cycle. In this manner, LED current accuracy can be achieved at lower dimming duty cycles, while still achieving enhanced operational efficiency at higher dimming duty cycles. | 03-05-2015 |
| 20150061529 | DRIVING CIRCUIT AND DRIVING METHOD FOR LIGHT-EMITTING DIODE - The present invention relates to a driving circuit and a driving method for LED. The driving circuit for LED comprises an inductor used for producing an output current, a power switch coupled to the inductor and used for controlling the inductor to transmit the output current to a plurality of LEDs and drive the plurality of LEDs, an adjusting circuit receiving a PWM signal related to the output current, and a driving unit producing an adjusting impedance value according to the PWM signal. The driving unit generates a switching signal according to the adjusting impedance value. The switching signal switches the power switch and enables the inductor to produce the output current. The driving unit adjusts the frequency of the switching signal according to the adjusting impedance value. | 03-05-2015 |
| 20150084534 | LIGHTING APPARATUS AND ILLUMINATION SYSTEM USING THE SAME - A lighting apparatus includes a power supply unit and a control unit configured to control the power supply unit. The control unit determines, at a time of activation of the lighting apparatus, a first color temperature of the load at an initial stage of lighting based on a command value. Thereafter, the control unit controls the power supply unit such that the light quantity and the color temperature of the load change according to a second output characteristic during a period in which the color temperature of the load changes from the first color temperature to a second color temperature. The second color temperature is a color temperature, in the first output characteristic, corresponding to the command value. A correspondence relationship between a plurality of light quantities and a plurality of color temperatures defined by the second output characteristic is different from that of the first output characteristic. | 03-26-2015 |
| 20150108915 | LED DRIVING DEVICE, LIGHTING DEVICE AND CONTROL CIRCUIT FOR LED DRIVING DEVICE - An LED driving device includes a first converter, a second converter, and a control circuit. The first converter generates a first voltage from received alternating current (AC) power. The second converter receives the first voltage and drives a plurality of LEDs based on the received first voltage. The control circuit sets a reference voltage level based on a level of the first voltage generated by the first converter, and controls the level of the first voltage by comparing a level of the AC power and a level of the reference voltage. | 04-23-2015 |
| 20150115825 | OLED POWER DRIVER CIRCUIT - An efficient, cost effective power driver for OLED panels is configured with a small BOM without compromising the display quality. The power driver adopts only one Inverting Buck-Boost Converter (IBBC) to regulate the necessary output voltage for the OLED panel load. The output voltage to drive the OLED panel load is supplied by the IBBC and the positive input of the OLED panel is tied into the input power supply of VIN directly without any switch. A DC-DC converter is provided to generate a reference ground and drive the associated control circuits. The input DC voltage VIN is utilized as a reference voltage for both the IBBC and the DC-DC converter. | 04-30-2015 |
| 20150115826 | DISPLAY DEVICE AND DRIVING METHOD THEREOF - Provided is a display device, including: a plurality of pixels; a scan driver connected to a plurality of scanning lines connected to the plurality of pixels; and a gate signal generator configured to determine a level of a gate-on voltage according to ambient temperature and to supply the gate-on voltage to the scan driver, wherein the gate signal generator is further configured to apply a hysteresis characteristic to a thermistor voltage to vary according to the ambient temperature. | 04-30-2015 |
| 20150137695 | Method for Driving LED - Method and means for driving one or more LEDs. The method includes turning a power switch on to provide current through an inductor and the power switch, measuring voltseconds of the LEDs at a cycle time, comparing the measured voltseconds to a reference signal at an end of the cycle time, generating a signed discrete logical signal based on a difference between the measured voltseconds and the reference signal, and generating a control signal using the signed discrete logical signal to regulate a peak current through the power switch by keeping the cycle time voltseconds substantially constant. The reference signal may be proportional to a set average LED voltage. | 05-21-2015 |
| 20150145430 | COMBINED DIGITAL MODULATION AND CURRENT DIMMING CONTROL FOR LIGHT EMITTING DIODES - A method includes providing an input signal identifying a desired brightness for one or more LEDs to first and second parallel control paths. The method also includes generating a digital modulation control signal using the first control path, generating a current control signal using the second control path, and driving the one or more LEDs using the control signals. The method further includes performing compensation in at least one of the control paths to compensate for an increased efficiency of the one or more LEDs. Generating the control signals could include (i) adjusting the digital modulation control signal while maintaining the current control signal at a substantially constant value for a range of lower LED brightness values and (ii) adjusting the current control signal while maintaining the digital modulation control signal at a maximum value or within a range of maximum values for a range of higher LED brightness values. | 05-28-2015 |
| 20150145431 | VOLTAGE-CONTROLLED DIMMING OF LED-BASED LIGHT MODULES COUPLED IN PARALLEL TO A POWER SUPPLY - Some embodiments include a LED-based light module. The LED-based light module can include a memory to store a color mixing plan; a regulator that receives a variable output voltage from a power supply; a voltage measurement component, coupled in parallel to the regulator and the power supply, configured to measure a voltage level of the variable output voltage; a logic component; and a driver circuit. The logic component can be configured to determine driving current profiles for LEDs in the LED-based light module to dim a light output of the LEDs based on the voltage level. The driver circuit can drive the LEDs according to the driving current profiles by drawing power from the power supply (e.g., through the regulator). | 05-28-2015 |
| 20150311680 | DISTRIBUTION OF CORONA IGNITER POWER SIGNAL - A corona discharge ignition system comprising a plurality of corona igniters is provided. The system includes a control and drive electronics unit for directing the energy from a power supply toward the corona igniters; and a single transformer disposed between the control and drive electronics unit and the plurality of corona igniters. A plurality of igniter switching units is connected to the control and drive electronics unit and each igniter switching unit is connected to a separate one of the corona igniters. Each igniter switching unit allows current to travel from the transformer to the one connected corona igniter when activated and prevents current from traveling from the transformer to the one connected corona igniter and from the one connected corona igniter toward the transformer when deactivated. Only one of the igniter switching units is activated at any given time during operation of the system. | 10-29-2015 |
| 20150311803 | ENHANCED POWER FACTOR CORRECTION - A power converter is described that includes a switch. The power converter may also include a controller that controls the switch. The controller may be configured to ascertain a first parameter. Additionally, the controller may be configured to ascertain a second parameter. The controller may dynamically modulate duty cycle of the switch based on the first parameter and the second parameter in addition and independent of the control loop. | 10-29-2015 |
| 20150312985 | INDUCTIVE POWER TRANSFER SYSTEM - An inductive power transfer system comprises a primary side unit ( | 10-29-2015 |
| 20150319816 | SINGLE-WIRE DIMMING METHOD - A single-wire dimming method is provided in the present invention. The method is adapted for a lamp with a first color light source and a second color light source. The method includes: providing a dimming control interface, wherein the power voltage is chopped when the dimming control interface is operated; dividing a period of the power voltage into a first phase period, a second phase period and a third phase period; chopping the power voltage at the first phase period when a user adjust the dimming control interface to turn on a first color light; chopping the power voltage at the second phase period when a user adjust the dimming control interface to turn on a second color light; chopping the power voltage at the third phase period when a user adjust the dimming control interface to turn on a mix color light, wherein the mix color light is to combine the first color light and the second color light. | 11-05-2015 |
| 20150373809 | FULL COLOR LED MODULE HAVING INTEGRATED DRIVER TRANSISTORS - LED modules are disclosed having a control MOSFET, or other transistor, in series with an LED. In one embodiment, a MOSFET wafer is bonded to an LED wafer and singulated to form thousands of active 3-terminal LED modules with the same footprint as a single LED. Despite the different forward voltages of red, green, and blue LEDs, RGB modules may be connected in parallel and their control voltages staggered at 60 Hz or greater to generate a single perceived color, such as white. The RGB modules may be connected in a panel for general illumination or for a color display. A single dielectric layer in a panel may encapsulate all the RGB modules to form a compact and inexpensive panel. Various addressing techniques are described for both a color display and a lighting panel. Various circuits are described for reducing the sensitivity of the LED to variations in input voltage. | 12-24-2015 |
| 20160029453 | CONTROL UNIT FOR A LED ASSEMBLY AND LIGHTING SYSTEM - A control unit for an LED assembly comprising a first and second LED unit, said LED units being serial connected is described. The LED assembly, in use, is powered by a switched mode power supply. The control unit being arranged to receive an input signal representing a desired output characteristic of the LED assembly, determine a first and second duty cycle for respective LED units associated with a nominal current of the switched mode power supply, for providing the desired output characteristic, determine the largest of the first and second duty cycles for respective LED units, determine a reduced current based on at least the largest of the duty cycles, adjust the first and second duty cycle for respective LED units based on the reduced current, provide an output signal for the LED assembly and the switched mode power supply based on the adjusted first and second duty cycles and the reduced current for obtaining the desired characteristic. | 01-28-2016 |
| 20160029463 | LIGHT-EMITTING DEVICE COMPRISING TWO INTERFACES - The invention relates to a light-emitting device comprising a first interface for supplying energy to the light-emitting device and comprising a second interface for transmitting a control signal or a plurality of control signals for controlling a lighting property of a light source of the light-emitting device. | 01-28-2016 |
| 20160036324 | System and Method for a Switching Converter - According to various embodiments, a method for operating a switching converter includes determining an operating parameter of the switching converter and, if the operating parameter is outside a first operating range, adjusting a control parameter in order to adjust the operating parameter to be within the first operating range. The operating parameter includes at least one of a switching frequency of the switching converter and a current ripple value of an output current. | 02-04-2016 |
| 20160057823 | LIGHTING APPARATUS WITH VARIABLE CURRENT SWITCHING FREQUENCY AND METHODS OF OPERATING SAME - An apparatus includes a current modulation circuit configured to modulate a current in at least one light-emitting device responsive to a pulse width modulated control signal and a control circuit configured to control a pulse width of the pulse width modulated control signal responsive to a first control input and to control a frequency of the pulse width modulated control signal responsive to a second control input. The first control input may include, for example, a current control input, and the second control input may include a light intensity control input, such as a dimming input. The control circuit may be configured to increase the frequency responsive to a change in the light intensity control input corresponding to a decrease in light intensity and to decrease the frequency responsive to a change in the light intensity control input corresponding to an increase in light intensity. | 02-25-2016 |
| 20160057824 | SOLID-STATE LIGHTING FIXTURE WITH COMPOUND SEMICONDUCTOR DRIVER CIRCUITRY - A lighting fixture includes a solid-state light source and driver circuitry. The solid-state light source includes at least one light emitting diode (LED). The driver circuitry includes one or more silicon carbide (SiC) switching components, and is coupled to the solid-state light source. Further, the driver circuitry is configured to receive an alternating current (AC) input voltage and generate a driver output current for driving the at least one LED from the AC input voltage. By using silicon carbide (SiC) for the switching components in the driver circuitry, the efficiency of the driver circuitry and thus the lighting fixture may be significantly increased, while simultaneously reducing the cost and complexity of the driver circuitry and thus the lighting fixture when compared to conventional lighting fixtures. | 02-25-2016 |
| 20160057840 | LIGHT-EMITTING ELEMENT DRIVING CIRCUIT SYSTEM - A light-emitting element driving circuit system is provided in which a plurality of current paths, in each of which a light-emitting element and a switching element which is controlled to be switched ON and OFF for causing light to be emitted from the light-emitting element are connected in series, are placed in parallel to each other, wherein an ON time of each switching element is adjusted based on a light-emission period which is a period in which the light-emitting elements are caused to emit light in a circulating manner, such that a number of switching operations of each switching element is reduced. | 02-25-2016 |
| 20160081149 | Solid State Lamp Control - Intelligent control of a solid state lamp when coupled to a trailing edge phase cut dimmer switch is provided. On and off cycles of the lamp's power stage switch are enabled during a period when the energy in the bulk capacitor is at its highest levels. During this period a bleeder circuit does not have to be enabled, which results in a greater operational efficiency as compared with normal switching schemes for trailing edge dimmers. | 03-17-2016 |
| 20160081156 | CIRCUIT FOR DRIVING AC DIRECT LIGHTING APPARATUS AND METHOD THEREFOR - Disclosed is a circuit for driving an AC direct lighting apparatus, including a triac dimmer configured to control a brightness of an LED module, a charger configured to be charged during a turn-off period of the triac dimmer, a reference voltage generator configured to generate a reference voltage based on a voltage charged in the charger during a first turn-off period of the triac dimmer and a voltage charged in the charger during a second turn-off period, and a driving signal output unit configured to output a driving signal of the LED module in response to a voltage charged in a third turn-off period of the triac dimmer reaching the generated reference voltage. Accordingly, the driving circuit manages a driving time deviation of the LED module, removing a flicker phenomenon from the light produced by the module. | 03-17-2016 |
| 20160095181 | Low-Overhead Current Generator for Lighting Circuits - This application relates to a lighting system comprising a plurality of light emitting diode, LED, circuits, and a power source for providing a drive voltage to the plurality of LED circuits. For each LED circuit, the lighting system comprises a first variable resistance element connected between the respective LED circuit and ground, and a first feedback circuit configured to control a voltage at a first node between the respective LED circuit and the respective first variable resistance element to a first voltage. The lighting system further comprises a current source and a second variable resistance element connected between the current source and ground, wherein each first variable resistance element is configured to attain a resistance value depending on a resistance value attained by the second variable resistance element. | 03-31-2016 |
| 20160105938 | LED Lamp - A LED lamp includes a body, and a switcher configured for controlling the body. The body includes two power input ends, a controlling signal input end, at least an LED load, and a controlling switch unit. The controlling switch unit controls the LED load to work according to an input signal from the controlling signal input end. The switcher includes a controlling signal output end. The controlling signal output end is electrically connected to the controlling signal input end and outputs controlling signal for the controlling switch unit to control working condition of the LED load. The switcher can be assembled onto any location of the LED lamp, such as two ends of the body, the junction assembly, and so on. As a result, it is easy for people to install, use and control the LED lamp. | 04-14-2016 |
| 20160113078 | MICROCONTROLLER BURST MODE TO MAINTAIN VOLTAGE SUPPLY DURING STANDBY MODE OF A LIGHTING SYSTEM - Provided is a lighting system that includes a plurality of lighting elements which emit light, a power supply which supplies power, a lighting driver comprising a microcontroller and which outputs power to the plurality of lighting elements for operation thereof; and a control system which transmits a control signal to the microcontroller to initiate a standby mode of the plurality of lighting elements. The microcontroller receives the control signal and decreases output power supplied to the plurality of lighting elements, while remaining in a low power consumption mode for communicating with the control system during standby mode. | 04-21-2016 |
| 20160113081 | CONTROL CIRCUIT AND METHOD FOR GENERATING VOLTAGE FOR LIGHT EMITTING DIODE LIGHTING DEVICE - Disclosed are a control circuit and a voltage generation method of an LED lighting apparatus which provides lighting using a rectified voltage. Light emission of the LED lighting apparatus can be implemented through current regulation, a rectified voltage used for light emission can be used to provide a constant voltage required for a peripheral circuit, and a current flowing through a current path formed by the current regulation can be controlled to perform dimming. | 04-21-2016 |
| 20160123541 | SOLID-STATE LAMPS WITH ELECTRONICALLY ADJUSTABLE LIGHT BEAM DISTRIBUTION - Solid-state lamps having an electronically adjustable light beam distribution are disclosed. In accordance with some embodiments, a lamp configured as described herein includes a plurality of solid-state emitters (addressable individually and/or in groupings) mounted over a non-planar interior surface of the lamp. The interior mounting surface can be concave or convex, as desired, and may be of hemispherical or hyper-hemispherical geometry, among others, in accordance with some example embodiments. In some embodiments, the heat sink of the lamp may be configured to provide the interior mounting surface, whereas in some other embodiments, a separate mounting interface, such as a parabolic aluminized reflector (PAR), a bulged reflector (BR), or a multi-faceted reflector (MR), may be included to such end. Also, the lamp may include one or more focusing optics for modifying its output. In some cases, a lamp provided as described herein may be configured for retrofitting existing lighting structures. | 05-05-2016 |
| 20160128140 | LIGHTING TECHNIQUES UTILIZING SOLID-STATE LAMPS WITH ELECTRONICALLY ADJUSTABLE LIGHT BEAM DISTRIBUTION - Solid-state lamps having an electronically adjustable light beam distribution are disclosed. In accordance with some embodiments, a lamp configured as described herein includes a plurality of solid-state emitters (addressable individually and/or in groupings) mounted over a non-planar interior surface of the lamp. The interior mounting surface can be concave or convex, as desired, and may be of hemispherical or hyper-hemispherical geometry, among others, in accordance with some example embodiments. In some embodiments, the heat sink of the lamp may be configured to provide the interior mounting surface, whereas in some other embodiments, a separate mounting interface, such as a parabolic aluminized reflector (PAR), a bulged reflector (BR), or a multi-faceted reflector (MR), may be included to such end. Also, the lamp may include one or more focusing optics for modifying its output. In some cases, a lamp provided as described herein may be configured for retrofitting existing lighting structures. | 05-05-2016 |
| 20160128147 | CONTROL OF NON-SELF-EXCITING-CONVERTER - Control circuits ( | 05-05-2016 |
| 20160143103 | BACKLIGHT UNIT - A backlight unit includes: a light source configured to emit light based on a driving current; and a backlight controller receiving a digital dimming signal that defines a length of an output period of the driving current from a pulse width modulator and configured to, when a duty ratio of the driving current is less than a reference duty ratio, modulates the duty ratio of the driving current so that the duty ratio of the driving current is equal to or greater than the reference duty ratio and decrease a duty ratio of the digital dimming signal. | 05-19-2016 |
| 20160150607 | LED LIGHTING APPARATUS AND CONTROL CIRCUIT THEREOF - Disclosed are an LED lighting apparatus and a control circuit thereof which controls the brightness of a lamp including LEDs using a dimmer. The LED lighting apparatus and the control circuit use a starting current based on a rectified voltage, in order to supply a holding current to the dimmer in a state where a lamp including LEDs is turned off. | 05-26-2016 |
| 20160157306 | Resonance Converter for Driving Multiple AC LED Strings | 06-02-2016 |
| 20160157316 | A LIGHT EMITTING DEVICE AND A METHOD FOR DIMMING A LIGHT EMITTING DEVICE | 06-02-2016 |
| 20160165689 | LED LIGHTING DRIVE CIRCUIT - An LED lighting drive circuit supplies power for N groups of LED loads. The LED lighting drive circuit comprises N current paths, N groups of LEDs, and a constant current section. The LED lighting drive circuit enables the current of LED lamps to change in a sinusoidal half-wave form with the utility AC input, and keeps the current a constant effective value. | 06-09-2016 |
| 20160174310 | LED BASED LIGHTING APPLICATION | 06-16-2016 |
| 20160174317 | IMPROVEMENTS IN AND RELATING TO DISPLAYS AND LIGHT SOURCES FOR DISPLAYS | 06-16-2016 |
| 20160174341 | LIGHTING SYSTEM AND CONTROL DEVICE | 06-16-2016 |
| 20160205736 | LED DRIVING ARRANGEMENT WITH REDUCED CURRENT SPIKE | 07-14-2016 |
| 20160205739 | PHOTONIC ENGINE SYSTEM FOR ACTUATING THE PHOTOSYNTHETIC ELECTRON TRANSPORT CHAIN | 07-14-2016 |
| 20160255686 | DETECTION AND CONTROL MECHANISM FOR TAIL CURRENT IN A BIPOLAR JUNCTION TRANSISTOR (BJT)-BASED POWER STAGE | 09-01-2016 |
| 20160255687 | A METHOD OF CONTROLLING A LIGHTING ARRANGEMENT, A LIGHTING CONTROLLER AND A LIGHTING SYSTEM | 09-01-2016 |
| 20160255692 | LED DRIVER CIRCUIT | 09-01-2016 |
| 20170238379 | Operating Circuit for Energizing a Lamp, LED Converter, and Method for Operating an Operating Circuit | 08-17-2017 |
