Abstract: An LED (Light-Emitting Diode) output power adjusting device includes an analog/digital conversion and detection circuit, a computation and control unit, a digital/analog conversion control circuit, and a power supply circuit. The analog/digital conversion and detection circuit is connected to an LED based load to detect a forward voltage thereof and converts the forward voltage into an output of digital signal. The computation and control unit perform evaluation and computation on the digital signal of the forward voltage to obtain a digital current control signal indicating a corresponding current. The digital/analog conversion control circuit converts the digital current control signal into an analog current control signal, which is then fed to a constant current drive circuit of the LED based load to adjust an output power of the LED based load to approximate a constant power condition.

Abstract: An illumination assembly, comprising: at least one luminous means having at least one luminescence diode chip as light source, and at least one energizing means, which is connected to the at least one luminous means via a connecting line, wherein the energizing means is designed to energize the at least one luminous means. The energizing means comprises at least one filter element designed to filter signals which enter into the energizing means from a power supply for the energizing means and exit from the energizing means into the power supply.

Abstract: A lighting system includes a plurality of fixtures, wherein each fixture includes a plurality of fluorescent lamps. A dimming ballast is operatively coupled to each fixture, each dimming ballast receives power from an outside source that is delivered to the fluorescent lamps within each corresponding fixture. A control module communicates with each dimming ballast, the control module receives a lighting level from an outside source, determines the most power efficient lighting solution and outputs a control signal to each dimming ballast related to the light output level of each lamp within each fixture.

Abstract: Disclosed are a lighting control apparatus, a lighting control method, and a lighting control system. The lighting control apparatus makes communication with lighting devices, registers at least one of the lighting devices according to received signal strengths of the lighting devices, and controls the registered lighting device. The lighting control apparatus easily registers and controls the lighting devices.

Abstract: A load control device, such as an electronic ballast, for controlling the power delivered from an AC power source to an electrical load, such as one or more fluorescent lamps, comprises a power converter having an inductor and a power switching device coupled to the inductor, a load control circuit adapted to be coupled to the electrical load, and a control circuit operable to calculate an average input power of the load control device. The control circuit may be operable to calculate a cumulative output power of the power converter while the ballast is preheating filaments of the lamps, and to subsequently determine a fault condition in the lamps in response to the calculated cumulative output power of the power converter. Further, the control circuit may be operable to transmit a digital message including the calculated average input power of the load control device.

Abstract: A handheld device includes control elements, an illumination element operable to illuminate the control elements, a light sensor that detects an illumination level, and a sensor that detects whether or not the device is being held. When the illumination level is below an ambient light threshold and the device is being held, the illumination element and activates. However, when either the illumination level is not below the ambient light threshold or the handheld electronic device is not being held, the illumination element deactivates and/or does not activate. In some implementations, the sensor includes a capacitance touch switch and/or a resistance touch switch that detects contact with skin, a gyroscope and/or an accelerometer that detects movement of the handheld device, a pressure sensors that detects exertion of pressure on the handheld device, and/or an additional light sensor that detects when a portion of the handheld electronic device is covered.

Abstract: An apparatus and method for reducing the perception of flicker of solid state light sources. An alternating current (AC) signal is passed through an AC conditioning circuit and a passive resonating circuit before being supplied to a string of solid state light sources, such as light emitting diodes.

Abstract: The present invention relates to a LED driver that minimizes the driver electronic pin count and integrates the short circuit protection feature. An NPN bipolar transistor is employed in a boost converter configuration to drive a LED string in the backlight display applications. The bipolar transistor is integrated with the driver electronics by two pins. Drive current is injected from the NPN transistor to the LED string to minimizing high voltage connection of each LED string to one.

Abstract: An illumination system in accordance with an embodiment hereof includes a plurality of LED units, a system controller, at least one sensing unit, and a plurality of local controllers each associated with at least one LED unit. Each LED unit includes a plurality of differently colored, independently controllable LEDs forming a color gamut. The system controller generates control signals for each of the LED units consistent with a desired system-level output. The sensing unit(s) senses an operating state of the LEDs during operation thereof, and each local controller includes a memory and a compensator. The memory includes calibration data for use over a short time period, and the compensator updates the calibration data based on measurements from a sensing unit over a long time period. Based at least in part on the calibration data, the local controller operates the LEDs of the LED unit to maintain output intensities consistent with commands issued by the system controller.

Abstract: A lighting assembly having a socket adaptor and a microprocessor for receiving user input and selectively actuating at least one LED based on that user input. The microprocessor is electrically connected to the socket adaptor. A processor-readable medium is in electrical communication with the microprocessor. An LED assembly comprising at least one plurality of LEDs is electrically connected to the microprocessor. A lens encloses the LED assembly and the microprocessor. An input device is electrically connected to the microprocessor to receive user input.

Abstract: A patient monitoring device comprising a display unit comprising a plurality of light sources, wherein the plurality of light sources is configured to backlight a medical image film placed on the display unit for viewing the medical image film, and a control unit configured to activate the plurality of light sources based on a user input.

Abstract: The present invention is aimed at providing a dimmer capable of preventing malfunctions due to noise contamination or waveform distortion of the voltage of an AC power source.

Abstract: A system and process for controlling power delivered to an electrical load, such as lighting system, to controllably effect operation of the load (e.g., intensity of illumination). In at least some embodiments, the system and process interpret a user-adjustable setting of a typical electronic low voltage (ELV) dimmer control device that is otherwise isolated from facility AC power. An electrical stimulus, such as a relatively low power AC or DC voltage, is applied at one or more externally accessible terminals of the ELV dimmer control. An electrical response of the dimmer control to the stimulus is measured at one or more externally accessible terminals of the dimmer control. The electrical response varies according to the applied electrical stimulus and a user-adjustable setting of the dimmer control. An indication of the setting of the user-adjustable control is determined from the measured electrical response, and used to correspondingly dim a lighting source.

Abstract: A nitride semiconductor light emitting element includes a light emitting layer. The light emitting layer includes an InxGa1-xN well layer (0<x?1) having a principal surface that is an m-plane. A profile in a depth direction (depth profile) of an In composition ratio x in the InxGa1-xN well layer has a plurality of peaks. Values of the In composition ratios x at the respective plurality of peaks are different from one another.

Abstract: A serial-type LED device includes p light source units and a dimming circuit. Each light source unit includes first and second terminals, m light strings and m current balance units. Each light string includes LEDs coupled in series to have a first terminal coupled to the first terminal of a corresponding light source unit and a second terminal coupled to the second terminal of the corresponding light source unit through a corresponding current balance unit. The first terminal of the first light source unit is coupled to a second DC voltage, and the second terminal of the i-th light source unit is coupled to the first terminal of the (i+1)-th light source unit, where m and p are integers greater than or equal to 2, and i is any integer from 1 to (p?1). The dimming circuit coupled to the second terminal of the p-th light source unit controls the second DC voltage according to a current outputted from the p-th light source unit.

Abstract: 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.

Abstract: A lighting device using an electroluminescent material, in which color mixing and dimming can be performed by a simple method, is provided. A lighting device including a first light-emitting element and a second light-emitting element which emits light having a wavelength longer than that of light emitted from the first light-emitting element and starts to emit light at a lower voltage than the first light-emitting element, is provided. The first light-emitting element and the second light-emitting element are connected in parallel, whereby a mixed color of emission colors of the first light-emitting element and the second light-emitting element is controlled by a voltage applied to the first light-emitting element and the second light-emitting element.

Abstract: A lighting ballast and associated methods balance current through resonant inductors that have inductance variation, and are further effective to balance lamp currents in the range from full brightness to full dimming. The ballast includes a lighting power source, a balancing transformer having a plurality of windings, a first resonant tank circuit having one or more transformer windings and a second resonant tank circuit having a like number of transformer windings. Each of the windings for the first resonant tank are reversed in direction in association with a corresponding winding for the second resonant tank, such that the only current passing through the windings is a current difference between the two windings.

Abstract: An LED light source assembly for signage illumination includes one or more planar LED arrays located with respect to a light spreading system for uniformly distributing light onto a viewing surface. The light spreading system includes a plurality of reflectors in combination with a transverse deflector disposed directly above and in the light emanating path of a planar LED array. The transverse deflector is oriented angularly and projects at least a portion of light onto a lateral reflector of the light spreading system. In one embodiment, a heat dissipation fixture is supported external to a housing assembly for improved heat management. The LED arrays and the plurality of reflectors and transverse deflectors are affixed directly to the heat dissipation fixture.

Abstract: The present disclosure is directed to a light emitting diode (LED) lighting system. In one embodiment, the LED lighting system includes an LED light source deployed in a first location and a power supply for powering the LED light source, wherein the power supply is remotely located from the LED light source in a second location and designed to power the LED light source to minimize a power loss along a length of an electrical connection coupled between the LED light source and the power supply.

Abstract: 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.

Abstract: This invention relates to a method of controlling a lighting system (1) which has a plurality of polygonal lighting modules (3) arranged as an array, and a controlling device (7) connected to one of the lighting modules. The lighting modules are arbitrarily arrangeable by each lighting module being able to communicate with neighboring lighting modules via communication units (11) arranged at all sides of the lighting module.

Abstract: Fixed Frequency, Fixed Duration power controls methods and systems are described for application of power to electrical loads. FFFD techniques according to the present disclosure utilize power train pulses with fixed-frequency fixed-duration pulses to control power applied to a load. The load can be any type of DC load. FFFD techniques allows for controlled variation of the fixed length of the ON pulse, the Fixed length of the OFF or recovery period, the total time period for one cycle, and/or the number of pulses in that time period. Applications to electric motors, electric lighting, and electric heating are described. Related circuits are also described.

Abstract: An LED drive circuit that sufficiently exhibits the performance of an LED element to obtain a favorable luminance at room temperature, includes a constant-current circuit including an LED element, a constant-current output unit, and a temperature sensing element having a negative resistance-temperature coefficient. The LED element is connected to the constant-current output unit in series. The constant-current output unit is connected to the LED element in parallel. Due to changes in the resistance value of the constant-current output unit caused by changes in temperature, the value of a current passing through the LED element is increased at room temperature and the value of a current passing through the temperature sensing element is reduced at high temperature.

Abstract: A lighting arrangement comprises a checking device and a method for the control thereof, with a sensor device containing at least one light source, where the at least one light source radiates light with high radiant power which represents a danger to the eyes of operators or service personnel. A housing, which contains the at least one light source and prevents an emergence of light of the light source, is monitored as to whether the housing is open, where the at least one light source with high radiant power is switched off if there is detected upon the monitoring an opening of the housing, which permits an emergence of light of the light source. It is provided here that a lighting arrangement is switched on at the same time or later which has a radiant power not representing any danger to the eyes of operators or service personnel.

Abstract: An inductive LED lamp bulb comprising a male connector, casing, LED, lamp panel and PIR sensor, of which the male connector is set at upper part of the casing, both LED and lamp panel are set at lower part of the casing; moreover, the lamp panel covers said LED, while a controller is embedded into said casing, which is also equipped with a timing switch and a contrast switch; said PIR sensor of a removable structure is mounted at the lower part of the casing, and protruded from said lamp panel; said controller is electrically connected with LED, PIR sensor, timing switch and contrast switch; thus, the utility model can be used as a common LED lamp bulb with more control functions and broader range of applications by disassembling easily the PIR sensor.

Abstract: Methods and apparatus are provided for generating low EMI display driver power supply. The methods and apparatus include switching circuits that utilize two groups of parallel circuit traces, each of which is coupled to one end of a switching device. The two groups of traces are configured to be interleaved with each other such that no two traces from either group are next to any other traces from the same group. When the switching device is activated, current flows through the circuit and charges an energy storage element. When the switching device is deactivated, the energy storage element discharges a portion of its energy to a second energy storage element and to the driver circuits. In another embodiment, an additional circuit trace is provided which is only connected on one end and is free floating on the other end to capture the majority of EMI remaining that was generated by the switching circuit.

Abstract: One embodiment of a fully integrated intelligent lighting module with built-in heat sink allows conventional electrodeless discharge lamps, LED, or electrodeless plasma lamps to be converted into intelligent electrodeless discharge lamps or electrodeless plasma lamps with minimal effort. Such a module may be comprised of a driver for an electrodeless discharge lamp or electrodeless plasma lamp capable of operating from 120-277V at 50/60 Hz as well as 347V and 480V in different models; a dimming chip; a sensor chip with clock to monitor the time and power used; a ROM module to store the data collected by the sensor chip; on-board non-volatile memory; a wireless communication module; and an external display and programming controls. Such a module allows users who install it into any pre-existing “dumb” light fixture to quickly and easily convert that fixture into an “intelligent” one.

Abstract: A system for providing effects during an event includes a control device and multiple audience devices, where each of the audience devices are worn by or otherwise associated with individual members of the audience. Signals from an emitter on the control device control the effects on the audience devices. Lighting effects across an event audience may be achieved by varying the color, intensity, and timing of the activation of the LEDs on the audience devices. The signal from the control device emitter may be directional, such that only certain audience devices produce the desired lighting effect at any given time, and the movement of lighting affects through the audience may be dynamically controlled.

Abstract: The present invention is directed to a method for remotely monitoring and controlling a light emitting diode. In one embodiment, the method includes establishing a two-way communication path via a communication module to a central office, wherein said communication module is coupled to said LED based street light and sending information related to the LED based street light to the central office via the two-way communication path.

Abstract: An alternating current (AC) light emitting device includes an AC light emitting diode (LED) module and a waveform modulation unit. The AC LED module includes at least two sets of micro-diodes. The waveform modulation unit coupled between the AC LED module and an AC voltage source modulates a waveform of the AC voltage source.

Abstract: A driving circuit of a light emitting diode (LED), including a driving unit, a current pre-charging unit and a feedback unit, is provided. The driving unit outputs a driving power to drive the LEDs and outputs at least one first feedback signal according to the current conducted in the LEDs. The current pre-charging unit is coupled to an output of the driving unit to provide a current path to the driving unit and generates a second feedback signal. One of the at least one first feedback signal is selected to adjust the driving power when the enable signal is at a first logic level; the second feedback signal is selected to adjust the driving power when the enable signal is at a second logic level so as to maintain a current to drive the LEDs.

Abstract: A multi-channel circuit having respective channels powered through transformers having primary windings connected in series allows substantially equal constant currents to be provided through all channels by cross-regulation while only a single channel need be monitored and controlled. The variation in current between channels is generally small and largely insensitive to imbalances between voltages on loads due, for example, to different numbers of LEDs in series connected strings in illumination devices and can be further reduced by inverse coupling between inductors in respective channels. Efficiency is improved through reduction in the number of stages of the constant current source since the respective channels provided both DC-to-DC conversion and constant current regulation.

Abstract: Proposed is a light module (110) comprising at least two primary light sources (111,112,113) capable of emitting a primary color light. This allows the light module to emit light having intensity (Y) and color coordinates (x,y) through additive color mixing of the constituent primary colors. The light module further comprises an modulator (115) capable of modulating the primary light sources enabling embedment of data in the light emitted. The modulator (115) is arranged to modulate the color coordinates of the light emitted for embedding the data. This is especially advantageous as the sensitivity of the human eye to changes in color is lower than to changes in intensity. The invention thus advantageously allows embedding the data into the light emitted from the light modules (110) of an illumination system (100) without reducing the performance of its primary function as an aid to human vision.

Abstract: A system, method, and portable or mobile controller are provided for network management of functions such as monitoring, control, programming, and calibration of a plurality of (UV) light sources, for photo-reactive and photo-curing applications. Beneficially, a reliable and controlled closed-loop feedback network is provided in which a dose of light, or exposure profile, for e.g. spot curing, can be programmed into a light source unit to perform a highly repeatable operation across a single or multiple work stations. The system is scalable up to 1000's of workstations.

Abstract: A device and method to automatically control timing of outside lighting are achieved. An ephemeris program and a calendar are loaded into memory on a timing device. Power is applied to the device wherein a GPS circuit on the device is energized, and Greenwich Mean Time (GMT), Current Day (CD), and physical location of the device are determined from satellite signals through an antenna or alternately from a repeater circuit or a key fob type device. GMT and CD that are retrieved are stored in memory. Lighting on and off times are calculated by the ephemeris program based on physical location, the calendar, GMT, CD, and the user selected distance of the sun below the horizon. Lights are turned on and off based on the calculated on and off times.

Abstract: Systems and methods for controlling an output of a light fixture. A light fixture of one construction includes four or more light sources and is configured to produce an output that mimics the color temperature changes of an ideal black-body radiator based on one or more input parameters. The input parameters correspond to, for example, a desired target color and an intensity for the desired target color. A white point setting is determined based on the one or more input parameters and a relationship between the one or more input parameters and the color temperature of an ideal black-body radiator. A color temperature transform is selected based on the white point color temperature setting, and is used to determine a color coordinate corresponding to a modified target color. A set of light source output values corresponding to the modified target color are identified, and the light sources are driven to the identified output values.

Abstract: In illustrative implementations of this invention, a lighting system comprises a plurality of LEDs, fluorescent lights, incandescent lights, a processor, a sensor node and a human-computer interface. The sensor is adapted to be moved by a user and placed in the location that a user wants to illumine. The LED lights are adapted to emit pulse-width modulated (PWM) light, controlled by signals from the processor. The lighting system is adapted to optimize parameters (such as efficacy or color rendering index) selected by the user, subject to certain constraints (such as desired illuminance or color temperature). According to principles of this invention, if a sensor is moved, attenuation may be measured and the inverse square law may be used to determine how constraints in an optimization algorithm need to be updated.

Abstract: Embodiments of the invention provide a DC/DC converter. The DC/DC converter includes a transformer, a switch controller and a driver controller. The transformer has a primary winding coupled to a power source, a first secondary winding provides a first output voltage to a first load, and a second secondary winding provides a second output voltage to a second load. The switch controller is coupled to the primary winding and controls a first switch coupled to the primary winding to control input power to the primary winding and to regulate the first output voltage based on a power requirement of the first load. The driver controller is coupled to the second secondary winding and generates a pulse modulation signal to alternately turn on and turn off a second switch coupled to the second secondary winding to regulate the second output voltage based on a power requirement of the second load.

Abstract: An apparatus and method of deducing building floor plan information are disclosed. One method includes changing an intensity of light generated from a plurality of lights within a building. A plurality of light sensors senses an intensity of light received from at least one of the plurality of lights. A distance between at least one light sensor and at least one of the plurality of lights is estimated based on the sensed intensity of light.

Abstract: Methods, systems and apparatuses for controlling a light through an automatic mode and a bypass mode are disclosed. One method includes receiving physical signaling. Detection of a predetermined sequence of the physical signaling is used to determine whether to control the light in the automatic mode or the bypass mode. The automatic mode provides network control of the light, and the bypass mode bypasses the network control of the light. One lighting system includes a light, a sensor for receiving and sensing the physical signaling, and a controller detecting a predetermined sequence of the physical signaling. Detection of a predetermined sequence of the physical signaling is used to determine whether to control the light in the automatic mode or the bypass mode. The automatic mode provides network control of the light, and the bypass mode bypasses the network control of the light.

Abstract: System and method for driving a plurality of cold-cathode fluorescent lamps. The system includes a subsystem configured to receive at least a DC voltage and generate a first AC voltage in response to at least the DC voltage, a power converter configured to receive the first AC voltage and convert the first AC voltage to at least a second AC voltage, and a plurality of current balancing devices. Each of the plurality of current balancing devices is configured to receive two currents and balance the two currents. The power converter and the plurality of current balancing devices are capable of being directly or indirectly coupled to a plurality of cold-cathode fluorescent lamps.

Abstract: A lighting system, a dimming control apparatus, and a dimming control method are provided. The dimming control apparatus includes a control unit and a dimming driving unit. In response to a dimming command and a number, the control unit decodes the dimming command into a plurality of sub-dimming commands. The dimming driving unit has a plurality of output terminals for coupling to a plurality of lamp modules. According to the sub-dimming commands, the control unit controls the dimming driving unit to output a plurality of dimming driving signals corresponding to the lamp modules to adjust the brightness of each lamp module individually.

Abstract: A light emitting diode (LED) lighting system includes a PFC and output voltage controller and a LED lighting power system. The controller advantageously operates from an auxiliary voltage less than a link voltage generated by the LED lighting power system. The common reference voltage allows all the components of lighting system to work together. A power factor correction switch and an LED drive current switch are coupled to the common reference node and have control node-to-common node, absolute voltage that allows the controller to control the conductivity of the switches. The LED lighting system can utilize feed forward control to concurrently modify power demand by the LED lighting power system and power demand of one or more LEDs. The LED lighting system can utilize a common current sense device to provide a common feedback signal to the controller representing current in at least two of the LEDs.

Abstract: A LED driver and controller system utilizes switches to parallel connect to respective sets of one or more LEDs and a current source to provide efficient control of the LEDs. In at least one embodiment, the LEDs are connected in series. An LED controller of the LED driver and controller system 200 controls conductivity of the switches. In at least one embodiment, the LED controller provides control signals to one or more LED drivers. The LED drivers receive the control signals and, in response to the control signals, control the conductivity of each switch. In at least one embodiment, the conductivity of the each switch is controlled using a duty cycle modulated control signal. In at least one embodiment, the duty cycle modulated control signal is a pulse width modulated control signal. In another embodiment, the duty cycle modulated control signal is a pulse density modulated control signal.

Abstract: A light bulb includes a bulb base, a light holder, a plurality of light emitting elements, and a bulb shell. The bulb base has a connection part and an engaging part disposed opposite to each other. The light holder includes a surrounding wall connected to the bulb base at the engaging part, and an end wall connected to the surrounding wall. The light emitting elements are disposed on the surrounding wall and the end wall and are connected electrically to the bulb base. The bulb shell includes a light-transmissive shell body that engages the engaging part of the bulb base, and has a receiving space defined by the shell body and into which the light holder extends.

Abstract: Provided is an LED driving apparatus capable of improving a power factor through a non-insulation type simplified circuit structure, including: a light emitting unit having at least one LED; a rectifier rectifying an alternate current (AC) voltage applied from external power; a power supply unit supplying driving power to the light emitting unit, and having an inductor connected to an output terminal of the light emitting unit; and a switch controller.

Abstract: A DMX based wireless, light emitting device and system including wireless modules that are battery powered and wirelessly receive and transmit DMX to other modules or a controller device. The modules can optionally be hard wired to both a DMX signal and external power supply. An integrated processor can independently control a pre-selected lighting effects, channels, addresses, programs and other light effect features.

Abstract: A lighting system has a lighting fixture with a white light source and a color light source, a control circuit pulses the white and color light sources and changes relative duty cycles of the light sources to alter a color output of the lighting fixture, in response to a change in a control signal from a controller. A comparator compares a reference voltage relating to an aggregate current driving the light sources to a signal voltage relating to the periodic signal from a signal generator. The comparator controls a switch that controls one of the light sources. A duty cycle of the color light source can be vary inversely to a duty cycle of the white light source.

Abstract: A method of configuring an LED driver is disclosed. The LED driver being arranged to provide a supply current to an LED fixture comprising a plurality of LEDs. The method comprises: identifying the LED fixture (LF)1 sending via a communication network (NTW) a configuration request to a configuration database (DB), receiving configuration data from the configuration database; and configuring the LED driver (LPS) according to the configuration data.