Abstract: A solid state lighting platform comprised of one or more modular lighting instruments each of which are comprised of an enclosure, driver/logic module(s) governed by a microprocessor and a unique array of emitter boards consisting of a multitude of lighting elements. The lighting instruments may joined together using magnets embedded in the enclosure(s) and receive control instructions from a smart device or any other light on the wired or wireless network. A unique algorithm and look up table allow flicker free dimming and highly accurate color temperature tuning from the microprocessor.

Abstract: A light-irradiating apparatus which emits light for activating a body is provided. The light-irradiating apparatus includes a blue light source, a white light source, and a controller. The controller controls the white light source and the blue light source, and adjusts irradiation intensities of light emitted by the blue light source and the white light source. The controller causes the white light source to continuously maintain an on state and causes the blue light source to repeat an on state and an off state. The controller causes a sum of the irradiation intensity of the light which is emitted by the white light source and the irradiation intensity of the light which is emitted by the blue light source to be greater than or equal to a biological effect threshold at which light produces an effect of activating the body.

Abstract: The invention relates to a controlled device (1, 1?), a system (25, 25?) comprising such controlled device (1, 1?) and a controller device (21), a method for setting up such controlled device (1, 1?) and a software product for a set up processor (3, 3?) of such controlled device (1, 1?). In order to allow the controlled device (1, 1?) to persistently stay within the framework of the system (25, 25?) over its power cycles while avoiding or at least reducing a need for a costly element like a NVRAM on the side of the controlled device (1, 1?). Rather than providing costly NVRAM in the controlled device (1, 1?), the controlled device (1,1?) is just provided with fixed information which allows the controlled device (1,1?) to receive or obtain the variable control data from the controller device (21) as an outside source.

Abstract: A load control system may include load control devices for controlling power provided to an electrical load. The load control devices may include a control-source device and a control-target device. The control-target device may control the power provided to the electrical load based on digital messages received from the control-source device. A user device may discover load control devices when the load control devices are within an established range associated with the user device. The user device and the load control devices may communicate via a wireless communications module. The established range may be adjusted based on the configurable transmit power of the user device or the wireless communications module associated with the user device. A discovered control-target device may be associated with a control-source device to enable the control-target device to control the power provided to the electrical load based on digital messages received from the control-source device.

Abstract: Provided is control method and a lighting system having a plurality of lighting elements that includes a power supply for supplying power, a lighting driver having a microcontroller and configured to receive power from the power supply and output power to the plurality of lighting elements for operation thereof, a control system in electrical or wireless communication with the microcontroller, and configured to communicate with the microcontroller, to control an operational mode of the plurality of lighting elements via the lighting driver, wherein the microcontroller is configured to transmit an output reference signal as a control signal, and a peak detection circuit that receives the output reference control signal from the microcontroller, and generates a standby control signal from the output reference control signal received, to thereby operate the plurality of lighting elements in an on or standby mode.

Abstract: A lighting device includes light emitting element groups (HSB) including a light emitting element group (HS2) that emits light when being applied with a voltage at a light emission reference voltage (VH2), and a light emitting element group (HS12) that emits light when being applied with a light emission reference voltage (VH12) higher than the light emission reference voltage (VH2), the light emitting element groups (HSB) emitting light when being applied with a voltage equal to or higher than a light emission reference voltage (VHa); a semiconductor chip (IC1) including a light emission control unit (HC1) arranged to perform light emission control to cause light emission of a light emitting element group (HS) if a drive voltage (Vk) is higher than the light emission reference voltage (VHa), and to perform light emission stop control to stop the light emission if the drive voltage (Vk) is lower than the same; and a semiconductor chip (IC2) including a light emission control unit (HC2) arranged to perform lig

Abstract: The present disclosure provides a mobile terminal and a method for filling light for same, and relates to the field of electronic technologies. The method includes: upon receiving an activating instruction for a target camera, activating the target camera; displaying an image acquired by the target camera on a display screen which is located on a surface different from a surface where the target camera is located; detecting brightness of present ambient light, and in response to that the brightness of the present ambient light is less than a preset brightness threshold, illuminating the display screen on the same surface where the target camera is located.

Abstract: In response to determining that the line power source for a subset or all member devices of a lighting control group is interrupted, an emergency luminaire enters an emergency mode (EM) active state by controlling a light source, via a driver circuit, to continuously emit emergency illumination lighting. Upon entering the EM active state, the emergency luminaire transmits, via a wireless lighting control network, an EM active message to a lighting control group repeatedly at a predetermined time interval. Emergency luminaire receives, via the wireless lighting control network, an EM exit message from another member device indicating to exit the EM active state. In response to receiving the EM exit message from the other member device, the emergency luminaire exits the EM active state by controlling the light source, via the driver circuit, to discontinue emitting the emergency illumination lighting.

Abstract: A method may include, based on a plurality of duty cycles each associated with a respective one of a plurality of LEDs, determining a first set of drive schemes such that each drive scheme is associated with a respective one of the plurality of LEDs and is dependent on the duty cycle associated with the respective one of the plurality of LEDs. The method further includes driving each of the plurality of LEDs in accordance with the associated drive scheme of the first set in at least one drive cycle. Each of the plurality of drive schemes includes one or more on-times each having a phase and a duration. The method may include driving each of the plurality of LEDs in an on-state or an off-state dependent on the respective drive scheme and determining the drive scheme dependent on the drive scheme of another one of the plurality of LEDs.

Abstract: A load control system may comprise load control devices for controlling respective electrical loads, and a system controller operable to transmit digital messages including different commands to the load control devices in response to a selection of a preset. The different commands may include a preset command configured to identify preset data in a device database stored at the load control device and/or a multi-output command configured to define the preset data for being stored in the device database. The system controller may decide which of the commands to transmit to the load control devices in response to the selection of the preset.

Abstract: An online voltage adjustment circuit for a board power supply, where a first voltage division circuit is coupled in parallel to a first bias resistor, a second voltage division circuit is coupled in parallel to a second bias resistor, and a detection chip obtains an initial output voltage of the board power supply. Based on the initial output voltage and a preset voltage, a control chip controls a first switch on the first voltage division circuit to be on or off, and a second switch on the second voltage division circuit to be on or off. As a result, a feedback value of a feedback pin of the board power supply changes, and then an output voltage of the board power supply changes, thereby adjusting the output voltage of the board power supply.

Abstract: A load regulation device, such as an LED driver, may be configured to control the intensity of a light source based on an analog control signal and a preconfigured dimming curve. The LED driver may sense a magnitude of the analog control signal and determine a new low-end and/or high-end control signal magnitude that falls outside of the input signal range of the dimming curve. The LED driver may rescale the preconfigured dimming curve according to new low-end and/or high-end control signal magnitudes and dim the light source based on the rescaled dimming curve. Multiple LED drivers controlled by the same analog control signal may communicate with each other regarding the magnitude of the analog control signal sensed by each LED driver, and match their target intensity levels despite sensing different analog control signal. A controller may be provided to coordinate the operation of the multiple LED drivers.

Abstract: Feedback is received from a plurality of devices. External data is also received. Statistical patterns of the plurality of devices are determined based on the feedback. A policy is determined based on the statistical patterns, the feedback, and the external data. The policy may include a set of rules dictating the operation of each of the plurality of devices and reducing energy consumption at the plurality of devices. Control data based on the policy is transmitted to the plurality of devices. The control data may be operative to transform the operation of the plurality of devices according to the set of rules.

Abstract: A display apparatus and a controlling method thereof are provided. The display apparatus may include: a display panel that displays a screen; a light source disposed at one side of the display panel; an audio input that receives an audio signal; and a processor that flickers the light source in response to the received audio signal.

Abstract: Power converter controllers, power converters and corresponding methods are provided. A power converter controller may have a first input for receiving an indication of an output of the power converter and a second input operative to receive a supply voltage. A control circuit of the power converter controller (10) controls a primary side switch of the power converter based on both the supply voltage and the indication.

Abstract: Direct-bonded LED arrays and applications are provided. An example process fabricates a LED structure that includes coplanar electrical contacts for p-type and n-type semiconductors of the LED structure on a flat bonding interface surface of the LED structure. The coplanar electrical contacts of the flat bonding interface surface are direct-bonded to electrical contacts of a driver circuit for the LED structure. In a wafer-level process, micro-LED structures are fabricated on a first wafer, including coplanar electrical contacts for p-type and n-type semiconductors of the LED structures on the flat bonding interface surfaces of the wafer. At least the coplanar electrical contacts of the flat bonding interface are direct-bonded to electrical contacts of CMOS driver circuits on a second wafer.

Abstract: A wireless battery-powered daylight sensor for measuring a total light intensity in a space is operable to transmit wireless signals using a variable transmission rate that is dependent upon the total light intensity in the space. The sensor comprises a photosensitive circuit, a wireless transmitter for transmitting the wireless signals, a controller coupled to the photosensitive circuit and the wireless transmitter, and a battery for powering the photosensitive circuit, the wireless transmitter, and the controller. The photosensitive circuit is operable to generate a light intensity control signal in response to the total light intensity in the space. The controller transmits the wireless signals in response to the light intensity control signal using the variable transmission rate that is dependent upon the total light intensity in the space. The variable transmission rate may be dependent upon an amount of change of the total light intensity in the space.

Abstract: A Power Factor Correction (PFC) circuit includes an oscillator circuit. The oscillator circuit receives a valley detect signal indicating a zero current condition, determines a blanking time according to an operational cycle of the PFC circuit, and determines to initiate the operational cycle according to the valley detect signal and the blanking time. Determining the blanking time includes selecting one of a plurality of predetermined blanking times according to a count of operational cycles of the PFC circuit. The PFC circuit may operate in a Boundary Conduction Mode or a Discontinuous Conduction Mode depending on whether a charge-discharge period is greater than the blanking time. The PFC circuit may determine, according to its output voltage, a first duration of a charging period, determine a delay time according to zero current times of previous operational cycles, and extend the first duration of the charging period by the delay time.

Abstract: A display power circuit is provided. The display power circuit includes a power supply circuit that receives an input voltage and generates an output voltage to power a display. A power switching device couples the output voltage from the power supply circuit to provide a display voltage for the display. A monitor circuit generates a shut down signal based on a change of the output voltage relative to the input voltage exceeding a predetermined threshold indicating a short circuit condition of the display voltage. A control circuit disables the power switching device based on the shut down signal if the short circuit of the display voltage is detected.

Abstract: This present invention provides a Curved LED tubular lamp, comprising a Curved lamp tube as mentioned above, wherein the first straight tube has a first inner wall and a first outer wall opposite to the first inner wall along the longitudinal axis of the first straight tube, and the second straight tube has a second inner wall and a second outer wall opposite to the second inner wall along the longitudinal axis of the second straight tube, and the rear supporter has a third inner wall and a third outer wall opposite to the third inner wall along the axis of the rear supporter, whereby the first inner wall, the third inner wall and the second inner wall is defined as an inner area, and the first outer wall, the third outer wall and the second outer wall is defined as an outer area; a LED light board installed on the inner area of the Curved lamp tube; two lamp caps respectively capped on the front ends of the first straight tube and the second straight tube, and connected with each other by a first front suppo

Abstract: A system for a power switch of a multiphase power converter coupled to an inductive load including a test controller, a voltage sampling circuit, a processing circuit, and a converter. A test pulse is applied to power switches of the converter to generate a test current through the inductive load, which forward biases a body diode of a power switch during a freewheel portion after the test pulse is completed. The voltage across the body diode is sampled during the freewheel portion, and the voltage samples are converted to a voltage value and a slope value. The voltage and slope values are converted to an estimated temperature value based on a characterization of the inductive load and the body diode. The conversion may be performed by a lookup table that stores an estimated temperature value for each unique combination of the voltage and slope values.

Abstract: An emergency LED lighting system maintains power to an LED lighting source based on measured voltages and currents provided to the LED lighting source; rolls back or decreases power provided to an LED lighting source over time in order to increase the amount of time the battery can power the LED lighting source; executes a soft start procedure, such that the power provided to the LED lighting source is gradually ramped up during activation of the LED lighting sources; identifies a type of battery coupled to the emergency LED lighting system; cycles the emergency LED lighting system between charging mode and standby mode to reduce power consumption over a window of time; detects AC power or an absence of AC power; and/or uses a status LED to communicate information about the emergency LED lighting system with a remote device.

Abstract: A single live-wire power fetching system capable of preventing flickering and enhancing power fetching efficiency, that includes a single live-wire power fetching switch module, a High Side Buck ac/dc, and a multifunction rectifying unit. The single live-wire power fetching module is provided with a live-wire input end and a live-wire output end, connected in series to a single live-wire to perform single live-wire power fetching, and to supply power for normal operation of circuits in the single live-wire power fetching switch module. The High Side Buck ac/dc is used to provide part of power for single live-wire power fetching, with input end of the High Side Buck ac/dc connected in parallel to the single live-wire power fetching switch module through multifunction rectifying unit, and with output end of the High Side Buck ac/dc connected to the single live-wire power fetching switch module to provide power.

Abstract: An electrosurgical generator is provided. The electrosurgical generator includes at least one converter configured to output a DC waveform and a nonlinear carrier control current. At least one boost inverter is coupled to the at least one converter and is configured to convert the DC waveform to generate at least one electrosurgical waveform. At least one inductor is connected in series with the at least one converter and at least one boost inverter and is configured to output an inductor current. A controller is coupled to the at least one converter and the at least one boost inverter and is configured to maintain the inductor current at a predetermined value by controlling a pulse duration of a duty cycle of the at least one converter based on a comparison of inductor current and the nonlinear control current.

Abstract: A light-emitting diode (LED) lighting device includes (i) a selector circuit that sequentially and cyclically selects a plurality of LED loads one by one, the plurality of LED loads respectively emitting light as a result of being selected, and (ii) a control circuit that controls the selector circuit to cause an intermediate color to be produced by successively generating frames, each frame being a temporal combination of at least one first cycle period and at least one second cycle period, the at least one first cycle period generating a first mixed emission color, and the at least one second cycle period generating a second mixed emission color different from the first mixed emission color.

Abstract: The disclosed technology relates to a lighting strobe system that utilizes an ambient light sensor to detect an intensity and color temperature of ambient light to set or adjust an intensity and color temperature of light to be emitted by a first array of LEDs and a second array of LEDs. The first array of LEDs may include warm color temperature LEDs having a color temperature of 2400-4000 Kelvin. The second array of LEDs may include cool color temperature LEDs having a color temperature of 4000-8000 Kelvin.

Abstract: An LED load is specified to be driven at a first voltage level for maximum brightness. A driver for the LED load determines a first current level consumed by the LED load while the first voltage level is applied to the LED load. Information is received to set a brightness level of the LED load and a second current level is calculated based on the first current level and the information received. Electrical power is then provided to the LED load at the second current level. A second voltage level of the electrical power provided to the LED with the second current level is unregulated and is less than the first voltage level.

Abstract: A load control device for an electrical load is configured to operate in a normal mode and a burst mode to adjust the amount of power delivered to the electrical load. The load control device comprises a control circuit that operates in the normal mode to regulate an average magnitude of a load current conducted through the load between a maximum rated current and a minimum rated current. During the normal mode, the control circuit controls the operating period of a load regulation circuit between a high-end operating period and a low-end operating period. The control circuit operates in the burst mode to regulate the average magnitude of the load current below the minimum rated current. During the burst mode, the control circuit adjusts the low-end operating period to be less than or equal to a minimum on time of the load regulation circuit.

Abstract: A display panel includes a substrate and a plurality of display dies. The display die is disposed on the substrate and includes a first source pad, a second source pad, a first common pad, a second common pad, a first gate pad, a second gate pad, a first transistor, a first LED, and a second LED. The first and second source pads are respectively disposed on the first and second sides of a circuit region. The first common pad and the first gate pad are disposed on the third side of the circuit region. The second common pad and the second gate pad are disposed on the fourth side of the circuit region. The first transistor is electrically connected to the first gate pad and the first common pad. The first and second LEDs are electrically connected between the first source pad and the first transistor.

Abstract: A chained flashlight system includes: plural flashlights; plural lighting control devices that control lighting of the plural flashlights, respectively; a communication wire; and a traffic control device. The plural lighting control devices include receiving units, controlling units, activating units, and power supply units, respectively and are coupled to the traffic control device by the same communication wire. The traffic control device simultaneously sends an activating signal to the plural lighting control devices via the communication wire. The receiving units receive the activating signal. The controlling units activate the activating units on the basis of the time condition from the reception of the activating signal to the activation of the activating units, set for the flashlights, respectively. When the power supply units are turned ON in an activated state of the activating units, respectively, the flashlights are lit by a lighting signal from the traffic control device, respectively.

Abstract: The present disclosure relates to decorative lamps, and in particular to a three-line four-way light string and control system thereof. The three-line four-way light string and control system thereof comprises signal lines L1, L0, L2, a plurality of LED lamps are connected between the signal line L1 and the signal line L0 in parallel, and a plurality of LED lamps are connected between the signal line L2 and the signal line L0 in parallel. The three-line four-way light string and control system thereof provided by the present disclosure can be produced by utilizing a full mechanization manner so as to have high yield and accuracy, save raw material and energy consumption, have a little pollution and be applicable to mass production.

Abstract: In embodiments of the present invention improved capabilities are described for providing intelligent power control in response to an external power interruption, causing a processor is in an electrical fixture to interrogate an external power control switch to gain an understanding of the switch's state, where prior to the external power interruption the electrical fixture may be powered by external power and where external power may be connected and disconnected by a user of the switch. In the event that the switch's state is determined to be such that it would normally pass power to the electrical fixture, the processor causes the electrical fixture to operate using a backup power supply. In the event that the switch's state is determined to be such that it would normally not pass power to the electrical fixture, the processor causes the electrical fixture to act as if the user of the switch has intentionally removed power.

Abstract: Disclosed are systems and methods for adjusting environmental conditions based on automatically and manually generated requests. A commissioned unit comprising at least one IP luminaire (140, 150), transmits a signal comprising one or more identification codes. The signal may be, for example, a coded light signal. An environment control device (160) receives the signal, detects user input indicating one or more preferred environmental conditions, and transmits an environment control request comprising the one or more preferred environmental conditions. An environment manager module (110) receives the environment control request, generates an environment control command using the control request, and transmits the environment control command to one or more commissioned units to alter environmental conditions in a space in accordance with the user input.

Abstract: A LED driving circuit and method for balancing efficiency and a power factor. The circuit comprises a voltage input module, an LED load, a constant current control module and a current turn-off slope control module for adjusting the turn-off slope of the current flowing through the LED load, such that a compromise between efficiency and power factor is achieved. When an input voltage is higher than a setting voltage, the current flowing through the LED load is turned off, such that the power consumption is reduced; in addition, the efficiency and power factor are balanced by adjusting the turn-off slope of the current. According to the present invention, a compensation capacitor is used to control the average current in an alternating current period and to limit peak current, thereby implementing constant power output within a wide range of input voltage.

Abstract: A portable apparatus is provided for configuring and/or programming lighting drivers without mains power application. An apparatus housing comprises first and second connectors and an antenna. During a first mode wherein the first connector is coupled to an external computing device, a battery receives and stores power therefrom, and a first controller receives and stores at least driver configuration settings therefrom. When the external device is disconnected the battery powers the apparatus, which polls a transceiver circuit to detect a driver antenna proximate to the apparatus antenna. The apparatus housing is configured to mount to a luminaire comprising the detected driver, wherein the second connector is coupled to the driver and the battery provides power to a driver controller. The first controller also during this second mode transfers the stored at least driver configuration settings to the driver controller via the operably proximate antennae, for example via bidirectional negotiations therewith.

Abstract: Apparatus and associated methods relate to synchronizing a plurality of lighting display controllers so as to temporally coordinate a corresponding plurality of lighting displays controlled thereby. A clock or timer is configured to generate a time sequence of timing signals, to which the plurality of lighting display systems synchronize themselves. Each of the plurality of lighting display systems display a first of a time sequence of spatial illumination patterns in response to receiving, from the transmitter, a signal indicative of a temporal start of the synchronized plurality of lighting displays. Each of the plurality of lighting display systems displays a subsequent spatial illumination patterns in response to receiving, from the transmitter, a subsequent timing signal.

Abstract: A control system for a stadium lighting system comprising a plurality of luminaires installed within the stadium to illuminate a pitch within the stadium in accordance with a light plan containing aiming information for each luminaire is disclosed. The control system comprises a data storage device storing the light plan and a controller communicatively coupled to the data storage device, the controller being responsive to object tracking information for an object travelling across the pitch. The controller is adapted to determine a direction of travel of the object from the object tracking information; evaluate the aiming information for each luminaire to identify if at least one luminaire is arranged to generate a luminous output in an aiming direction coinciding with said direction of travel; and generate a dimming level adjustment signal for the at least one identified luminaire to reduce the intensity of said luminous output.

Abstract: A lighting system includes a wireless controller, luminaires each configured to communicating with the wireless controller, and a storage. The wireless controller classifies a first luminaire among the luminaires, which is able to communicate using first transmission power, into a first group and stores the first luminaire on the storage, and classifies a second luminaire among the luminaires, which is able to communicate using second transmission power greater than the first transmission power, into a second group and stores the second luminaire on the storage.

Abstract: A converter controller controls a switching converter. A current detection circuit generates a current detection signal VCS that corresponds to a coil current IL of the switching converter. An error amplifier amplifies the difference between the current detection signal VCS and an analog signal VADIM that indicates a current to be supplied to a semiconductor light source, so as to generate an error signal VERR. A hysteresis comparator compares the current detection signal VCS with an upper threshold signal VTHH and a lower threshold signal VTHL determined according to the error signal VERR, and generates a control pulse SCNT that corresponds to a comparison result. A driver drives a switching transistor according to the control pulse SCNT.

Abstract: A system and method for controlling a multiplicity of luminaries connected to a single wire pair. The luminaries contain minimum circuitry to allow dimming and color tuning by pulses on the wire pair without the need for a separate control wire or control communication bus or network. A single luminary can be color tuned to many different colors as well as dimmed and turned on and off. A driver module drives the wire pair and receives commands over a network The driver module contains a pulse generation circuit that generates and applies pulses to the two-wire output. The amplitude of some the pulses control color of the luminary by selecting different LEDs in the luminary to light, while other pulses control brightness.

Abstract: A dimmer circuit is used in an LED lighting system which includes a power supply circuit and a lamp. The power supply circuit is configured to provide an AC voltage. The lamp is coupled to the power supply. The dimmer circuit is configured to adjust the brightness of the lamp according to a dimming signal without the lamp conducting a bleeder current during each cycle of the AC voltage.

Abstract: A light-emitting element driving semiconductor integrated circuit constitutes at least part of a light-emitting element driving device that is configured to drive a first and a second light source when the first light source is not short-circuited and drive the second light source when the first light source is short-circuited and that includes an output capacitor. The light-emitting element driving semiconductor integrated circuit has a controller configured to control the resistance value of a variable resistor connected in series with the first and second light sources according to the voltage across a resistor connected in series with the first and second light sources.

Abstract: A home automation (HA) system may include HA operation devices within a structure. At least one of the HA operation devices may include a light dimmer for a given area. The HA system may also include HA user interface devices for respective users within the structure. Each HA user interface device may be configured to wirelessly communicate with at least one of the HA operation devices. A HA hub device within the structure may provide communications for the HA user interface and operation devices. The HA hub device may receive a light-off command from an HA user interface device for the light dimmer and send a sequence of partial dimming commands to the light dimmer to turn the light off, and determine whether the given area is occupied based upon at least one HA operation device, and when occupied, then send a light-on override command to the light dimmer.

Abstract: A load control device for controlling power delivered from an AC power source to an electrical device may be configured to conduct current through earth ground and may disconnect a switching circuit to reduce an amount of current conducted through the earth ground. The load control device may comprise a controllably conductive device configured to control the power delivered from the AC power source to the electrical device so as to generate a switched-hot voltage, a switching circuit electrically coupled with a detect circuit, and a control circuit configured to render the switching circuit conductive and nonconductive. The detect circuit may generate a detect signal indicating a magnitude of the switched-hot voltage. The control circuit may be configured to monitor the detect signal and to render the switching circuit non-conductive after detecting an edge on the detect signal to reduce the total current through the earth ground.

Abstract: This disclosure is directed to a light emitting diode (LED) circuit for driving two or more different LED strings, which may be controlled in a complimentary fashion. The LED circuit includes current monitoring capabilities that are configured to monitor current through the two or more different LED strings. The circuit is designed in a way that can reduce or eliminate excessive sensing pins that are otherwise needed for the current monitoring. According to this disclosure, for example, very accurate current monitoring can be achieved by using two or more sensing resistors while only using two sensing pins for the current monitoring through two or more different LED strings.

Abstract: An encoder includes a light source. A booster circuit boosts a power supply voltage output by a battery, and outputs the boosted voltage. The voltage is applied to one end of a light-emitting diode. A driver circuit is inserted between another end of the light-emitting diode and a ground, the driver circuit controlling current flowing through the light-emitting diode. A voltage detector circuit detects a voltage between the light-emitting diode and the driver circuit. A control circuit causes the booster circuit to boost the power supply voltage when the voltage is lower than the power supply voltage; stops the boosting performed by the booster circuit when the voltage is equal to the power supply voltage; and controls the driver circuit such that, after the voltage reaches a predetermined value, current flows to the light-emitting diode.

Abstract: A light emitting apparatus having a housing including a portion defining a thermally conductive outer surface, a light source positioned within the housing, and an internal heat sink thermally coupling the light source and the thermally conductive outer surface portion of the housing. The light source may be a solid state device, such as a light emitting diode.

Abstract: There is provided a VCSEL drive circuit that causes a VCSEL to emit pulsed light in a light emission period, including a drive adjustment unit that adjust a first voltage which is a voltage of drains of a PMOS transistor and an NMOS transistor in a constant current circuit and a second voltage which is a voltage of a drain of an NMOS transistor that drives the VCSEL to be the same voltage in a pre-light emission period before the light emission period.

Abstract: A lighting driver (300, 400) for driving at least one lighting device (120) includes a control unit (310, 410) disposed on a first side of an electrical isolation barrier (320, 420), and a power supply unit (350, 450) disposed on a second side of the electrical isolation barrier so as to be electrically isolated from the control unit. The control unit supplies a single enable signal (302, 402) across the electrical isolation barrier to the power supply unit. The power supply unit includes a switching circuit (S1/S2) configured to selectively enable and disable, in response to the single enable signal, two output voltages for supplying power to an external device (130) which communicates data with the lighting driver.

Abstract: In connection with a ground transportation vehicle light head (86) powered by a battery-based voltage source (20) supplying positive (76) and reference (i.e., ground) (78) voltages that define a voltage difference (22) applied across a number of multiple series-connected high-power light-emitting diodes (HP LEDs) (12) and current regulator circuitry (80) electrically connected to them, ultra-low dropout circuit techniques are disclosed for increasing a portion of the voltage difference available from the battery-based voltage source to forward bias and thereby maximize the number of the multiple series-connected HP LEDs emitting light by maintaining a low voltage drop (82) across the current regulator circuitry.