Abstract: Disclosed is a LED lamp compatible with electronic ballast. The positive and negative electrodes of LED array are connected with two pins of lamp via four diodes respectively, by this way, regardless of which pin is connected to the positive electrode, the lamp circuit can form a conductive path to power for the LED array, and consumers can install the lamp without distinguishing the positive and negative electrodes, improving the efficiency of LED lamp replacement.

Abstract: Disclosed are devices suitable for connection to a light fixture, that in some embodiments are useful as components of a network and/or position-determining system.

Abstract: A new system and apparatus for selectively interrupting the power supply of lighting elements is described by example herein. The system may include a power interruption apparatus in electrical communication with a lighting element such as a motion activated security light. In preferred embodiments, the apparatus may include a power interruption module configured to selectively interrupt the power supply to the lighting element to change the status mode of the lighting element. In some embodiments, the apparatus may be controlled by a wireless remote control while in other embodiments the apparatus may be controlled by a wall switch. In yet further embodiments, the apparatus may be configured to partner with a home automation system through a home automation remote thereby allowing a user to selectively change the status mode of a lighting element using an interface specific to their home automation system.

Abstract: A backlight unit includes a light source part, a DC/DC converter, and a light source driving circuit. The DC/DC converter receives an input voltage and provides a driving voltage to the light source part. The light source driving circuit receives an analog voltage, generates a clamping voltage on the basis of the analog voltage, and generates a main driving signal applied to the DC/DC converter on the basis of the analog voltage and the clamping voltage. The light source driving circuit decreases a duty ratio of the main driving signal when the analog voltage is equal to or lower than a reference voltage.

Abstract: Light sources (1) such as retrofit light emitting diode tubes comprise light circuits (11) with light emitting diodes (12) and feeding electrodes (13, 14), terminals (21-24) for exchanging signals with ballasts (2, 3) or supplies (4, 5), and filament circuits (31, 41) for coupling the terminals (21-24) and the feeding electrodes (13, 14). The filament circuits (31, 41) comprise switch circuits (32) and trigger circuits (33) for in response to presences of frequencies in the signals bringing the switch circuits (32) into conducting modes to introduce relatively low impedances in the filament circuits (31, 41). In non-conducting modes the switch circuits (32) introduce relatively large impedances. This way, in case the light source (1) is connected to a high-frequency ballast (2), the switch circuit (32) is triggered and the light source (1) is normally activated.

Abstract: A two-way load control system comprises a power device, such as a load control device for controlling an electrical load receiving power from an AC power source, and a controller adapted to be coupled in series between the source and the power device. The load control system may be installed without requiring any additional wires to be run, and is easily configured without the need for a computer or an advanced commissioning procedure. The power device receives both power and communication over two wires. The controller generates a phase-control voltage and transmits a forward digital message to the power device by encoding digital information in timing edges of the phase-control voltage. The power device transmits a reverse digital message to the controller via the power wiring.

Abstract: The invention relates to a DC power distribution system (1), especially to an EMerge DC power distribution system, for distributing DC power. A power supply (5) supplies DC power to a track (2) to which an electrical load (9, 10) is attached. A communication device (11) is attached to the track (2), which a) wirelessly receives communication signals and transmits the received communication signals via a power line communication provided by the track to the power supply (5) and/or the electrical load (9,), and/or b) receives communication signals via the power line communication from the power supply (5) and/or the electrical load (9, 10) and wirelessly transmits the received communication signals. Thus, a communication setting is provided, which allows for a very simple integration of a control functionality for controlling, for instance, the power supply 10 and/or the electrical load by transmitting control signals via the communication device.

Abstract: An emergency lighting driver (100, 200, 400) includes: a power translation circuit (120, 220, 421/423/425) which receives input power from an emergency power source (10) and supplies output power to a load (20); and a programmable control device (140, 240) which controls the power translation circuit in response to a voltage feedback signal and a current feedback signal to cause the output power supplied to the load to have a programmed power output profile (302, 304), wherein the programmed power output profile is a function of time, temperature, the type of energy source employed for the emergency power source, the amount of remaining energy stored in the emergency power source, and/or the occupancy of an area in which the emergency lighting driver is located.

Abstract: A dimming circuit for adjusting the brightness of an LED load, can include: a primary controlled flyback converter having a primary-side circuit, a first secondary-side circuit, and a second secondary-side circuit; a DC-DC converter coupled in a cascade arrangement with the second secondary-side circuit, where an output node of the DC-DC converter is coupled in series to an output node of the first secondary-side circuit; a control circuit configured to control, according to a dimming signal that represents an expected output current of the dimming circuit, a power switch of the primary controlled flyback converter to adjust output voltages of the first and second secondary-side circuits, to adjust a power that is provided to the LED load; and the control circuit being configured to control a power switch of the DC-DC converter according to the dimming signal, such that the DC-DC converter operates within a predetermined state range.

Abstract: A two-way load control system comprises a power device, such as a load control device for controlling an electrical load receiving power from an AC power source, and a controller adapted to be coupled in series between the source and the power device. The load control system may be installed without requiring any additional wires to be run, and is easily configured without the need for a computer or an advanced commissioning procedure. The power device receives both power and communication over two wires. The controller generates a phase-control voltage and transmits a forward digital message to the power device by encoding digital information in timing edges of the phase-control voltage. The power device transmits a reverse digital message to the controller via the power wiring.

Abstract: A power converter comprises a primary switch network coupled to a power source, wherein the primary switch network comprises a plurality of power switches, a controller configured to generate gate drive signals for the plurality of power switches, a secondary rectifier coupled to an output, a first transformer having a first winding coupled to the primary switch network, a second winding coupled to the secondary rectifier and a third winding coupled to the controller and a second transformer having a fourth winding coupled to the primary switch network, a fifth winding coupled to the secondary rectifier and a sixth winding coupled to the controller, wherein a voltage signal from the third winding and/or the sixth winding is processed to provide a feedback of a voltage at the output.

Abstract: Controlling the color temperature of a composite light source including at least one discrete-spectrum light source is disclosed. For example, the color temperature of a composite light source including at least one discrete-spectrum light source may be determined and/or adjusted based on one or more of the ambient color temperature of a space, the actual temperature of the space, the relative brightness of the space, the occupancy of the space, a time clock, a demand response command (e.g., from an electrical utility), the absolute location of the composite light source, the location of the composite light source relative to other light sources, inputs from a camera or other external devices, the operation of appliances or other machines in the vicinity of the composite light source, media content being utilized in the vicinity of the composite light source, and/or other sensor inputs.

Abstract: The subject matter of the instant invention is a plasma generation device in which at least one inductive device and at least one capacitive device are provided for coupling energy into a plasma in a plasma chamber. The at least one inductive device and the at least one capacitive device can be supplied with energy separately from one another by different frequency generators or by a common frequency generator.

Abstract: A flyback converter is provided with a controller that is configured to analyze the reflected feedback voltage waveforms to determine the presence of a ground connection fault for the auxiliary winding.

Abstract: A lifestyle lighting solution using a controller with program codes for managing night time illumination is disclosed; wherein the night time illumination is divided into at least two illumination modes including a regular illumination mode for providing early evening illumination and an user friendly illumination mode for providing a mid night illumination with a soft on process to avoid or mitigate an eye irritating hardship. The conversion time point to switch from a regular illumination mode to an user friendly illumination mode is controlled by a timer configured in an external control device. The timer is programmed to operate one of three time setting methods including an anytime setting method, a fixed time point setting method and a fixed time period method.

Abstract: The invention relates to a LED lighting system comprising a power supply circuit and at least one LED module. The power supply circuit comprises input terminals (K1, K2) for connection to a supply voltage source and output terminals (K3, K4),and a driver circuit (I, II) coupled between the input terminals and the output terminals for generating a LED current out of a supply voltage supplied by the supply voltage source, and comprising a driver control circuit (II) with an input terminal (K7) for receiving a current control signal and for generating a LED current in dependency of the current control signal.

Abstract: Methods and apparatus are presented for controlling a power converter to protect input filter inductors from overheating, in which an active front end (AFE) rectifier is operated in a boost mode to provide a boosted DC voltage at a derated output current value selected according to the DC bus voltage boost amount corresponding to a maximum load condition for which the filter inductors will not overheat.

Abstract: A lighting system includes multiple light sources, a sensing unit, and a control system. The light sources have different emission spectra, and the sensing unit is configured to measure a spectral content of light. The control system may be configured to use measurements from the sensing unit to select respective intensities for emissions from the light sources and then independently control the light sources to emit the respective intensities. In particular, the control system can select and render a spectral distribution selected based on the light reflected from objects that are being illuminated or render a spectral distribution to supplement light from other light sources and achieve a lighting objective.

Abstract: Systems, methods, and computer-readable media for determining the temperature of a light-generating component of a display assembly using a voltage of the light-generating component are provided. In one embodiment, a method for operating an electronic device, which may include an external surface and a light-emitting diode operative to emit light for illuminating the external surface, may include detecting the forward voltage of the light-emitting diode, calculating the temperature of the light-emitting diode using the detected forward voltage of the light-emitting diode, and altering the performance of the electronic device based on the calculated temperature of the light-emitting diode. Additional embodiments are also provided.

Abstract: The present disclosure relates to a supply voltage generating circuit and a switching power supply having the circuit. The supply voltage generating circuit provides a supply voltage for a power terminal of a control circuit in the switching power supply. The supply voltage generating circuit includes a switching circuit, a unidirectional conduction circuit and an energy storage circuit. In a time period during which a main power transistor is turned off, the switching circuit is turned off and a rectifying device provides a current to the energy storage circuit through the unidirectional conduction circuit, in a case that the supply voltage is smaller than a predetermined voltage reference; and the switching circuit is turned on and the current output from the rectifying device flows to the switching circuit, in a case that the supply voltage is larger than or equal to the predetermined voltage reference.

Abstract: A lighting device includes a current outputter, a load characteristic obtainer and a controller. The current outputter is configured to supply a current to a light source of at least one light source unit. The load characteristic obtainer is configured to obtain load information from a corresponding load information outputter of the at least one light source unit, by supplying the electric power to the load information outputter. The controller is configured to control the current of the current outputter, which is supplied to the light source, based on the load information. The load characteristic obtainer is configured to supply the electric power to the corresponding load information outputter only during a time period of obtaining the load information, but stop supply of the electric power to the corresponding load information outputter during a time period other than the time period of obtaining the load information.

Abstract: A lighting fixture includes a driver module and a separate light engine module, which has a solid-state light source and light engine memory. The driver module is electrically coupled to the light engine module and configured to drive the solid-state light source based on drive data. The drive data defines how the driver module should drive the solid-state light source to generate light with at least one defined lighting characteristic. The drive data may define or be used to identify the signal characteristics, such as drive currents, voltages, waveforms, and the like that must be provided by the driver module to drive the solid-state light source. The drive data is stored in the light engine memory of the light engine module, and the driver module is configured to retrieve the drive data from the light engine memory and drive the solid-state light source based on the drive data.

Abstract: A PWM dimmer includes a source terminal, a load terminal, a power stage, an interface, and control circuitry. The power stage is coupled between the source terminal and the load terminal and is configured to receive from the source terminal an AC supply signal and provide a pulsed AC load signal to the load terminal in response to a control signal. The AC supply signal has a sinusoidal envelope with a positive half-cycle and a negative half-cycle for each cycle. The pulsed AC load signal tracks the envelope and includes a plurality of pulses in the positive half-cycle and the negative half-cycle for each cycle. The interface is configured to receive dimming control information bearing on a dimming level from a user or remote terminal. The control circuitry is configured to receive the dimming control information from the interface and generate the control signal based on the dimming control information.

Abstract: A lighting system is disclosed which provides dynamic lighting control of each light on a rail lighting system. The lighting system is able to change settings of each light within a track lighting or rail lighting system based on motion, user preferences, lighting conditions, or security parameters. Light intensity and color can be set and scheduled based on user control and programming. Optical sensors may also be used to provide control input for the track lighting or rail lighting.

Abstract: A circuit arrangement for transferring energy includes an energy source, a control device and an energy distribution network. The energy distribution network has a base element and at least one load element. The base element includes a first intermediate circuit energy storage element which can be electrically connected to or disconnected from the energy source via two first controllable switching elements by way of the control device to form a first energy circuit. The at least one load element includes an energy consumer which can be electrically connected to or disconnected from the connections of the first intermediate circuit energy storage element via two second controllable switching elements by way of the control device to form a second energy circuit.

Abstract: The present disclosure provides devices, circuits, and methods for driving an LED display panel, so as to ensure the delivery of equal global charge at minimum gray scale. In one example, the circuit of the present disclosure includes a current source, a detection module, and a measurement module. The current source is configured to generate a current signal for the LEDs. The detection module is configured to detect a forward voltage of the LEDs in response to a low current applied to the LEDs. The detection module is further configured to hold the detected forward voltage. The measurement module is configured to measure a time period for an anode voltage of the LEDs to rise to the detected forward voltage in response to a display current applied to the LEDs.

Abstract: A lamp control device may include: a lamp including an LED module having a plurality of LED channels; a converter configured to receive a voltage corresponding to a turn signal, convert the voltage into an output voltage and internal voltage, and supply the output voltage to the LED module; and a controller configured to start counting a preset delay time when the internal voltage is supplied from the converter, and control the plurality of LED channels to sequentially light up at intervals of the delay time.

Abstract: Method and apparatus for granting control of a shared-access system. The method comprises: obtaining (305) an identity of a user; obtaining (310, 315) a priority rating associated with the user, wherein the priority rating is updated in response to one or more observed activities of the user, the one or more observed activities being linked to the shared-access system (100); comparing the priority rating with a threshold; and granting (320) control of at least a part of the shared-access system (100) to the user if the priority rating is above the threshold. For example, each user may have a respective ‘strength of association’ with the shared-access system or part thereof; the shared-access system may comprise one or more lighting units arranged to illuminate an environment, and a user who is present most often in the environment may be deemed to have the ‘strongest association’ with the shared-access system.

Abstract: An LED circuit includes a series of LED devices, a power supply circuit and a signal control circuit. Each of the LED devices includes an LED unit and an integrated circuit unit having a specific serial number and receiving an electrical parameter. The signal control circuit is coupled to the power supply circuit and the series of LED devices, and has a loaded status. The signal control circuit changes the loaded status in response to a control signal so as to cause the electrical parameter to have a variation, the variation of the electrical parameter generates a signal code having an information, all the integrated circuit units receive the signal code, and a specific LED unit will be driven by a corresponding integrated circuit unit when the signal code corresponds to the specific serial number of the corresponding integrated circuit unit.

Abstract: Processes for commissioning an indoor lighting system composed of a plurality of lighting fixtures, each including a lighting associate, include the steps of establishing a direct connection table for each lighting associate; forming a full direct connection table represented as a square matrix and comprising data derived from all direct connection tables; grouping the lighting associates using an element reduction operation on the square matrix; and transmitting a group direct connection matrix to each lighting associate.

Abstract: In a lighting device, a voltage detector outputs a detection voltage with a magnitude corresponding to a magnitude of a DC voltage outputted from a power supply circuit, a state determiner makes determination of whether a light source is in a turned-on state or in a turned-off state, a power controller is configured to control a DC power supplied from the power supply circuit based on a result of the determination by the state determiner, and the state determiner determines, when a value obtained by subtracting the detection voltage from a first reference voltage is equal to or larger than a first threshold value, that the light source is in the turned-off state.

Abstract: A projector includes a discharge lamp, a discharge lamp lighting device adapted to supply the discharge lamp with a drive current for driving the discharge lamp, a timer section adapted to count lighting time of the discharge lamp, and a control section adapted to control the discharge lamp lighting device to select and then perform either of a plurality of operation modes different in drive current to be output to the discharge lamp from each other, and the control section selects the operation mode based on the lighting time counted by the timer section.

Abstract: A LED driver adopts one power stage to provide a constant drive current to drive a load, and to provide different power supply voltages to power a smart module according to a dimming signal input by users through the smart module. The LED driver provides high performance with simple circuit structure.

Abstract: A controller for controlling a generator arranged to the generate a frequency signal for controlling a converter in a driver for driving a light circuit, the controller receiving feed-back information from the light circuit, and a processor; the processor configured to produce, in response to the feed-back information from the light circuit, a control signal arranged to control the generator, the feed-back information comprising a value of a feed-back signal that flows through at least a part of the light circuit or that defines a light intensity of at least a part of the light circuit, and the control signal defining a frequency of the frequency signal, adapt, in response to data information, the control signal, wherein the data information comprises a code for coding light produced by the light circuit; determine a static transfer of a combination of the converter and the light circuit defined by values of the feed-back signal and corresponding values of the frequency of the frequency signal; divide the val

Abstract: A multi-mode control scheme for an LED lamp system uses the detected firing angle of an AC input voltage waveform to select from multiple regulation modes. In operation, a current controller compares the detected firing angle to one or more specified thresholds and selects the appropriate regulation scheme based on the comparison result. When the detected firing angle is less than a first firing angle threshold, the controller employs a current shaping regulation mode. When the detected firing angle is greater than a second firing angle threshold, the controller employs a switching cycle-I Peak modulation regulation mode. And when the detected firing angle is greater than the first firing angle threshold and less than the second firing angle threshold, the controller employs a hybrid regulation mode.

Abstract: In a motor vehicle having motor vehicle exterior lighting devices and an operator control device, the following lighting modes of the motor vehicle exterior lighting devices can be set: deactivated, parking light, daytime running light, forwarding lighting, and automatic mode in which the motor vehicle exterior lighting devices are operated by an automatic forward light controller. The operator control device further has a single monostable operator control element by which the lighting modes can be set; or the operator control device has a monostable operator control element by which the deactivated, parking light, daytime running light and forward lighting lighting modes can be set. The operator control device has a pushbutton key or a toggle lever by which the automatic mode can be set.

Abstract: A light-emitting electrochemical cell 10 includes an emitting layer 12 and electrodes 13 and 14, one on each side of the emitting layer 12. The emitting layer 12 contains a light-emitting material and an ionic compound. The ionic compound has general formula (1), wherein M is N or P; R1, R2, R3, and R4 each independently represent a C1-C20 saturated aliphatic group; and X is preferably an anion having a phosphoric ester bond or a sulfuric ester bond. The light-emitting material is preferably an organic light-emitting polymer, a metal complex, an organic low molecular compound, or a quantum dot.

Abstract: A device includes light source and a controller. The light source includes a first LED coupled to a second LED, where a first terminal of the first LED is coupled to a first terminal of the second LED. The controller is configured to receive an input signal indicative of a color of light. The controller is also configured to adjust, based on the input signal, a first proportion of a current, the first proportion being applied to the first LED. The controller is also configured to adjust, based on the input signal, a second proportion of the current, the second proportion being applied to the second LED.

Abstract: A light system for a stadium, the light system comprising: at least one sensor configured to determine light intensity values for multiple locations within the stadium; at least one electronically controllable luminaire configured to generate light directed towards at least one location of the multiple locations within the stadium based on a received control parameter; a controller configured to receive the light intensity values from the at least one sensor, further configured to determine a light intensity difference based on the light intensity values from the multiple locations within the stadium, and configured to select the at least one electronically controllable luminaire and generate the control parameter for the least one electronically controllable luminaire based on the light intensity difference to attempt to reduce the light intensity difference.

Abstract: A ripple removing circuit and an LED control circuit applying the same are described herein. The LED control circuit receives alternating current input, converts the input into direct current with ripples and supplies power for an LED load. The direct current with ripples is connected to a positive end of the LED load, a negative end of the load is connected to a first end of a regulation tube, and a second end of the regulation tube is grounded. A first capacitor is connected between a control end of the regulation tube and the ground, and the time constant of the filter circuit formed by the first capacitor, a current generating circuit and a current source is far greater than a power frequency period. The current flowing across the regulation tube is approximately a direct current free of ripples, thereby decreasing the current ripples going across the LED load.

Abstract: A lighting control system for operating lighting in a room is provided. The lighting control system may comprise a load controller, sensors, and battery powered lighting control devices, such as switches, dimmers, and/or keypads. The load controller is configured for controlling the operation of a lighting load in response to messages received from the lighting control devices and sensors over a wireless network. The battery operated lighting control device is configured for detecting a low battery level, transmitting a low battery message to the load controller, and entering into a low battery mode during which it ceases transmitting any messages to the load controller until the battery is replaced. In response to the low battery message received from at least one lighting control device, the load controller is configured for entering into a low battery mode during which it maintains the lighting load turned on.

Abstract: A light source and method for making the same are disclosed. The light source includes a plurality of Segmented LEDs connected in parallel to a power bus and a controller. The power bus accepts a variable number of Segmented LEDs. The controller receives AC power and provides a power signal on the power bus. Each Segmented LED is characterized by a driving voltage that is greater than 3 times the driving voltage of a conventional LED fabricated in the same material system as the Segmented LED. The number of Segmented LEDs in the light source is chosen to compensate for variations in the light output of individual Segmented LEDs introduced by the manufacturing process. In another aspect of the invention, the number of Segmented LEDs connected to the power bus can be altered after the light source is assembled.

Abstract: Lighting circuits and luminaires and methods are disclosed which are operable with a phase-cut dimmer, A circuit can include a rectifier having a low side output and a high side output, a switched mode converter including a switch and an inductor, having a high side input connected to a bus rail, and having a configuration to draw current across a complete mains cycle a controller for the switched mode converter, a filter circuit connected between the rectifier high side output and the bus rail and including a capacitor connected between the high side output of the mains rectifier and ground, and a resistance connected between the low side output of the rectifier and ground. The value of the resistance may be such the RC time constant of the resistor and filter circuit is greater than the time required for any ringing in the circuit to fall to no more than 20 mA.

Abstract: LED lighting systems, mounting configurations, and light fixtures are disclosed for original and retrofit configurations. Some configurations mount the light fixture with a mounting bracket that allows for the removal and replacement of the light fixture in about the same time as a traditional light bulb change. Some configurations provide for fuse removal and replacement without the need to dismount the light fixture from its mounting bracket or without the need to open the housing of the light fixture to access the fuses. Some configurations use a battery backup system and self-check methods with LED light fixtures configured for public transportation applications.

Abstract: A backlight driver includes current sources that are connected between LED strings and a number of bias voltages. There can be any number of different bias voltages, each at a ground potential or higher voltage. The bias voltage is selected for a particular LED string in order to reduce a current drop across the current source. This reduces the power consumption of the current source and LED string. Heat dissipation is also reduced.

Abstract: In a DC-DC converter, a voltage at a connection point on the side of connection with a primary winding of a switching transistor is compared to a threshold voltage set within a variation range of the voltage at the connection point while the switching transistor is performing a switching operation, and, when the polarity by which the voltage was compared to the threshold voltage does not change during a detection period longer than the predetermined period of the drive signal for bringing the switching transistor under switching control, the switching transistor is determined as being operating in an active state with a danger of heat generation.

Abstract: A lighting system includes a lighting device and a dimming controller. The lighting device has a support structure that supports multiple lighting zones. Each lighting zone includes one or more lighting sources. The dimming controller is connected with multiple dimmers supported by the lighting device. Each of the lighting sources is connected to a corresponding dimmer from the multiple dimmers. The dimming controller sends a controlled setting for one or more of the lighting zones to the multiple dimmers.

Abstract: A dimmer switch (110-x, 200, 400, 600, 700A, 700B, 1200) adapted to be coupled to an alternating current (AC) source and to a load so as to control an amount of power delivered from the AC source to the load, the dimmer switch may include: a triode for AC (TRIAC) (208, 408, 612) coupled between the AC source and the load, and which when triggered conducts to deliver a controlled amount of power from the AC source to the load for a corresponding half-cycle of one or more half cycles of the AC source. The dimmer switch may include first and second triggering circuits (606, 608) configured to trigger the TRIAC when charged after being enabled. One or more of the triggering circuits may be a self-balancing triggering circuit. The dimmer switch may further include a controller (412, 602, 1210) which selects and thereafter enables one or more of the first or second triggering circuits.

Abstract: Apparatus and associated methods relate to development of a LED system with high thermal dissipation power relative to the system weight by the inclusion of open regions. The open regions reduce the weight of the optical system while improving airflow. Associated optics are described to efficiently and evenly distribute the light from an LED by tailoring the optical distribution. In addition, circuitry and methods are described to allow for the LED system to operate with existing power sources such as ballast or offline AC voltage sources or both.

Abstract: Systems and methods for facilitating collaboration between a local user or team in a meeting space and one or more remote users outside the meeting space are provided. The virtual co-location system may include, for example, an IOT device including sensors, a microphone, a beacon light, a speaker, a user control interface (e.g., including a control input adjusted by the local user, the user control interface producing an electronic control signal representing a setting of a control device), and/or a local microprocessor for executing local collaboration software. The virtual co-location systems and methods may also or alternatively include a remote computer having a remote microprocessor for executing remote collaboration software.