Abstract: A method of controlling a power supply electrically coupled to a dimmer and a light source includes receiving a plurality of sample values corresponding to dimmer levels, comparing a sample value of the plurality of sample values with one or more inflection points, the one or more inflection points being associated with a plurality of slew-rates, identifying a particular slew-rate among the plurality of slew-rates based on the comparison, and generating a control signal based on the particular slew-rate for transmission to the power supply.

Abstract: The present invention generally relates to systems and methods of illuminating plants, in particular, to providing supplemental lighting in addition to natural light to plants, and improving the crop yield when using such supplemental lighting. The invention is well suited for use in horticulture, for instance, in greenhouses.

Abstract: A multi-level switching power converter includes a multi-level power stage circuit which converts an input power to an output power. The power stage circuit includes an inductor, a conversion capacitor and plural power switches. The controller circuit controls the multi-level power stage circuit and includes: a feedback pulse generator circuit which generates a trigger pulse; a first timer circuit and a second timer circuit which determine a first time period and a second time period respectively according to the trigger pulse; and an adjusting circuit which adjusts the first time period according to a difference between the voltage across the conversion capacitor and a reference voltage such that an average of the voltage across the conversion capacitor is substantially equal to a level of the reference voltage.

Abstract: Systems, software, and methods are provided for efficient, dynamic lighting control. In an embodiment, a two-channel LED lighting system is dynamically controlled to emulate dimming of an incandescent fixture. In an example, a lighting fixture may include red, green, blue, and white emitting LED modules. The lighting fixture may be controlled such that it produces generally white light from about 2150K candle light color to 5500K daylight white color with only 4 LEDs. Furthermore, the white LED may be controlled such that the white LED CRI is approximately 95 to ensure optimal results when mixed with red and green. In another embodiment, a dynamic two-channel LED lighting system is controlled to emulate dimming of an incandescent fixture. Specific dimming protocol can allow for efficient dimming which helps minimize the height of a linear light fixture and maintain diffusion with multiple colored point sources at minimal pitch.

Abstract: An LED light and communication system is in communication with a broadband over power line communications system. The LED light and communication system includes at least one optical transceiver. The optical transceiver includes a light support having a plurality of light emitting diodes and at least one photodetector attached thereto, and a processor. The processor is in communication with the light emitting diodes and the at least one photodetector. The processor is constructed and arranged to generate a communication signal.

Abstract: A lighting device capable of generating warm or neutral white light using blue light-emitting diodes (“LEDs”), red LEDs, and/or luminescent material that responds to blue LED emission is disclosed. The lighting device includes multiple first solid-state light-emitting structures (“SLSs”), second SLSs, and balancing resistor element. The first SLS such as a string of blue LED dies connected in series is able to convert electrical energy to blue optical light, which is partially turned into longer wavelength emission by the luminescent material. The second SLS such as a red LED die is configured to convert electrical energy to red optical light, wherein the second SLSs are connected in series. While the first SLSs and second SLSs are coupled in parallel, the balancing resistor element provides load balance for current redistribution between the first and second SLSs in response to fluctuation of operating temperature.

Abstract: Two-wire dimmer operation includes controlling conduction of power to a lighting load. In one aspect, based on a conduction angle adjustment, power supply voltage is monitored and a maximum conduction angle is established based thereon. In another aspect, a dimming level signal is received and a dimming level for a dimmer is set based on the received dimming level. The dimming level signal indicates a desired dimming level for a dimmer, and a maximum value for the dimming level signal is based on a dimmer power supply voltage. In yet another aspect, based on detecting an adjustment to increase a conduction angle of a dimmer, the conduction end angle is increased and the conduction start angle is also increased. This results in a net increase in the conduction angle for controlling operation of the dimmer.

Abstract: An open-loop resonate converter includes: a transformer having a first winding on a primary side of the open-loop resonate converter and a second winding on a secondary side of the open-loop resonate converter; a resonant tank coupled to the first winding of the transformer and configured, at a first fixed frequency, to provide a constant LED current over a voltage range at the secondary side without feedback from the secondary side; and a circuit configured to modulate switching of the resonant tank between the first fixed frequency and a second fixed frequency higher than the first fixed frequency based on a dimming control signal input to the circuit, such that the resonant tank is switched at the first fixed frequency for longer durations when the dimming control signal indicates less dimming and for shorter durations when the dimming control signal indicates more dimming.

Abstract: A controllable lighting device may utilize a controllable impedance circuit to conduct a load current through an LED light source. The controllable impedance circuit may be coupled in series with a first switching device, which may be rendered conductive and non-conductive via a pulse-width modulated signal to adjust an average magnitude of the load current. The controllable lighting device may further comprise a control loop circuit that includes a second switching device. The second switching device may be rendered conductive and non-conductive in coordination with the first switching device to control when a feedback signal is provided to the control loop circuit and used to control the LED light source. The control loop circuit may be characterized by a time constant that is significantly greater than an operating period of the load current.

Abstract: A brake light pulser, particularly for center high middle stop lamps, that senses the voltage and current requirements for various types of light-emitting devices (LEDs, LED arrays, incandescent lamps, etc.) and adjusts the supplied current and voltage to the particular type of light-emitting device to which it is connected. A microprocessor with a flash-based architecture is used to process the sensed current and amperage into signals to control a constant current/constant voltage controller to provide correctly configured power to a MOSFET. The MOSFET is controlled by the microprocessor, which stores pulse command sequences programmed in directly over a CAN bus or remotely via a serial data link from a built-in RF transceiver. The pulsed configured power output of the MOSFET is supplied to a brake light.

Abstract: A power supply unit for an illumination device that includes a multi-mode power supply configured to supply power to an illumination device having one or more LED modules and a control circuit. The multi-mode power supply includes a primary power supply component configured to supply power to non-essential components of the illumination device, and a secondary power supply component configured to supply power to only essential components of the illumination device. The nonessential components include the one or more LED modules, and the essential components include the control circuit but not the one or more LED modules.

Abstract: The present application relates to a method for computing illumination mixed lights. The method includes the following. Acquire a first chromaticity coordinate point corresponding to a first colored light, and acquire a second chromaticity coordinate point corresponding to a second colored light. Acquire a target chromaticity coordinate point, and compute a first lumen mixing ratio of the first colored light and the second colored light. Determine a middle chromaticity coordinate point corresponding to a middle-colored light obtained by mixing according to the first lumen mixing ratio. Determine a first compensation colored light and a second compensation colored light which are matched with the middle chromaticity coordinate point. Conduct compensation computation on the middle colored light, and determine a second lumen mixing ratio corresponding to the first compensation colored light, the second compensation colored light and the middle colored light when mixed to the target chromaticity coordinate point.

Abstract: A system comprising a display, a display cover, a plurality of sensors disposed between the display and the display cover and a lighting control system coupled to the display and the plurality of sensors, the lighting control system configured to receive one or more signals from the plurality of sensors and to reduce a backlight level of a subgroup of lighting elements associated with the one or more sensors associated with the one or more signals, wherein the subgroup of lighting elements is one of a plurality of subgroups of lighting elements of the display.

Abstract: In an example, a method of operating an ultraviolet (UV) light source includes providing a supply power to the UV light source, and activating, using the supply power, the UV light source to emit UV light during a series of activation cycles. The method also includes, during at least one activation cycle in the series, sensing the UV light emitted by the UV light source to measure an optical parameter of the UV light. The optical parameter is related to an antimicrobial efficacy of the UV light. The method further includes adjusting, based on the measured optical parameter, an electrical parameter of the supply power to maintain a target antimicrobial efficacy of the UV light over the series of activation cycles.

Abstract: In an embodiment, a solid-state lighting circuit is included herein having a first plurality of emitters configured to output light of a first color and a second plurality of emitters configured to output light of a second color. The circuit further includes a current limiting circuit and at least one biasing resistor operably connected to the first plurality of emitters and the current limiting circuit. Current is biased toward the first plurality of emitters until a preselected current limit is reached for the first plurality of emitters, such that the first plurality of emitters outputs the light of the first color. When current is provided by the constant current power supply that is at or above the preselected current limit, current passes through the second plurality of emitters such that the second plurality of emitters outputs the light of the second color. Other embodiments are also included herein.

Abstract: A light source of a plant cultivation is turned on or turned off depending on a light period and a dark period of a plant, and the light source of the plant cultivation is turned on in the light period and emits a light having a spectrum with a plurality of peaks to the plant to increase a content of a predetermined substance in the plant.

Abstract: An image display apparatus is disclosed. The image display apparatus includes a display panel, an illuminance sensor to sense an ambient illuminance of the display panel, a plurality of light sources disposed in an edge region of a back surface of the display panel to output light, a plurality of switching elements to switch the light sources, and a processor to control the switching elements, wherein, when a difference in local dimming data of an input image between adjacent first and second regions is above a first reference value, the processor controls driving times of at least some of the switching elements to decrease a difference in illuminance between the first region and the second region, based on the illuminance sensed by the illuminance sensor.

Abstract: A load control device for controlling the amount of power delivered to an electrical load is able to operate in a normal mode and a burst mode. The load control device may comprise a control circuit that activates an inverter circuit during active state periods and deactivates the inverter circuit during inactive state periods. The control circuit may operate in the normal mode to regulate an average magnitude of a load current conducted through the electrical load to be above a minimum rated current. The control circuit may operate in the burst mode to adjust the average magnitude of the load current to be below the minimum rated current. The control circuit may adjust the average magnitude of the load current by adjusting the length of the inactive state periods while holding the length of the active state periods constant.

Abstract: An apparatus for an LED driver with a silicon-controlled dimmer, can include: a bleeder circuit coupled to a DC bus of the LED driver, and being configured to draw a bleeder current from the DC bus; and a controller configured to adjust the bleeder current to decrease in accordance with a first current sampling signal that represents a drive current flowing through an LED load after the silicon-controlled dimmer transitions from an off state to an on state. A method of controlling an LED driver can include: drawing a bleeder current from a DC bus of the LED driver; and controlling the bleeder current in accordance with a first current sampling signal representing a drive current flowing through an LED load to decrease after the silicon-controlled dimmer transitions from an off state to an on state.

Abstract: Various implementations disclosed herein includes a method for operating lighting fixtures in horticultural applications. The method may include receiving a user input of a desired irradiance for a first color channel of one or more lighting fixtures that irradiates a plant bed, in which each of the one or more lighting fixtures comprises at least one light emitting diode (LED) array, determining, for each of the one or more lighting fixtures, a PWM setting of the first color channel such that each of the one or more lighting fixtures irradiate the plant bed at the desired irradiance based on calibration data stored in each of the one or more lighting fixtures, and applying, to each of the one or more lighting fixtures, the determined PWM setting of the first color channel.

Abstract: A multi-level switching power converter includes a multi-level power stage circuit which converts an input power to an output power. The power stage circuit includes an inductor, a conversion capacitor and plural power switches. The controller circuit controls the multi-level power stage circuit and includes: a feedback pulse generator circuit which generates a trigger pulse; a first timer circuit and a second timer circuit which determine a first time period and a second time period respectively according to the trigger pulse; and an adjusting circuit which adjusts the first time period according to a difference between the voltage across the conversion capacitor and a reference voltage such that an average of the voltage across the conversion capacitor is substantially equal to a level of the reference voltage.

Abstract: A dimmer structured to be connected to a power source via a hot conductor and to a load via a load conductor includes a zero-crossing detector structured to generate a zero-crossing signal that that has a high state or a low state and changes states in response to a voltage between the hot conductor and the load conductor reaching or leaving zero volts only during a positive half-cycle of power received from the power source, a processing unit structured to receive the zero-crossing signal and to generate a triac control signal based on the zero-crossing signal, and a triac control unit including a triac and being structured to electrically connect between the hot conductor and the neutral conductor and to turn on and turn off the triac based on the triac control signal.

Abstract: A system and a method for automatically creating and operating a functional association of multiple luminaires is proposed. The system consists of two or more devices that each contain one or more sensors, logic processing circuitry and communication circuitry that is able to transmit messages between devices. The set of devices that constitute the members of a functional association is selected from a larger set of candidate devices. The selection process involves each device comparing the sensor data received from neighbouring devices relating to occupancy and daylight sensors against the device's occupancy and daylight sensor data.

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: A multi-phase VFD system with frequency compensated ground fault protection includes a variable frequency drive (VFD) power supply, a motor coupled to the VFD power supply by a plurality of power wires and a relay, an annular magnetic core provided with a sensor winding, where the plurality of power wires extend through the annular magnetic core, an analog signal conditioner, an analog-to-digital (A/D) converter, and a digital processor performing a Fast Fourier Transform (FFT) process on the received digital output of the A/D converter to provide frequency information which is used to develop a frequency equalized transfer function for calculating ground fault current.

Abstract: The present disclosure provides an electronic device-awakening method and apparatus, a device and a computer-readable storage medium. In embodiments of the present disclosure, the user's speech wakeup instruction which is used to awaken the electronic device is obtained, and then an audio data file is selected from at least two audio data files according to the speech wakeup instruction, as a wakeup answer file of the electronic device, so that the wakeup answer file of the electronic device can be played. Since there are more than one selectable audio data files, many types of prompt tones can be provided, thereby achieving the purpose of providing many types of wakeup prompts.

Abstract: A switch-mode power supply includes a power transistor, a transformer, and detection circuitry. The transformer includes a primary winding that is coupled to a drain terminal of the power transistor. The detection circuitry is coupled to a source terminal of the power transistor. The detection circuitry is operable to monitor signal present on the drain terminal via parasitic drain-source capacitance of the power transistor while the power transistor is switched off, and to detect demagnetization of a secondary winding of the transformer via the monitored signal.

Abstract: Systems, apparatuses, and methods relating to security system and automation monitoring are described. In one embodiment a method may include receiving motion detection data via an electrical signal, analyzing the motion detection data based at least in part on a first parameter, identifying a movement of an object based at least in part on the analyzing, and adjusting one or more light emitting diodes based at least in part on the identifying.

Abstract: A method of controlling a lighting and sound system comprising a controller and a plurality of lighting and sound devices 10 is provided. Each lighting and sound device 10 includes a light, a loudspeaker and a microphone 380. The method comprises receiving an audio instruction from a first user of the system at the microphone of a first device of the plurality of devices. The method further comprises processing the received audio instruction. The method further comprises transmitting the instruction from the first device to the controller. The method further comprises executing an action based upon the processed audio instruction.

Abstract: A system including at least one computerized device with voice command capability processed remotely includes a low power processor, executing a loose algorithmic model to recognize a wake word prefix in a voice command, the loose model having a low false rejection rate but suffering a high false acceptance rate, and a second processor which can operate in at least a low power/low clock rate mode and a high power/high clock rate mode. When the first processor determines the presence of the wake word, it causes the second processor to switch to the high power/high clock rate mode and to execute a tight algorithmic model to verify the presence of the wake word. By using the two processors in this manner, the average overall power required by the computerized device is reduced, as is the amount of waste heat generated by the system.

Abstract: A current detection circuit generates a current detection signal VCS that corresponds to a lamp current ILAMP supplied from a switching converter to a semiconductor light source. A hysteresis comparator compares a current detection signal VCS with an upper-side threshold signal VTHH and a lower-side threshold signal VTHL determined according to an analog dimming signal, and generates a control pulse SCNT that corresponds to the comparison result. A driver drives a switching transistor according to the control pulse. A PWM dimming circuit generates a gradual change signal by dulling a PWM (pulse width modulation) dimming signal, and changes the analog dimming signal based on the gradual change signal.

Abstract: A backlight unit and a display device including the same are provided. The backlight unit includes a light source; a mold frame configured to accommodate the light source and having a window frame shape with an opening therein; and a supporting member disposed on the mold frame and comprising an optical pattern, wherein the mold frame comprises a first sidewall, and an inclined surface protruding obliquely downward and inward from an inner side surface of the first sidewall, and wherein the supporting member is disposed on the inclined surface of the mold frame.

Abstract: Disclosed are drive chip, drive circuit and drive method capable of eliminating LED ghost. The drive chip comprises a processing unit, a blanking unit and a constant current drive unit. By blanking unit, parasitic capacitances of each row of scanning lines of an LED array is discharged during a blanking period, eliminating an upper ghost without needing to pull down additional circuits such as a resistor, no caterpillar effect or the reverse bias of LED lamp beads; charging parasitic capacitance of each column of scanning lines of the LED array, eliminating lower ghost. By constant current drive unit, constant current control is performed on LED lamp beads. Performing blanking and constant current control individually in two time periods, when displaying LED lamp beads, parasitic capacitance and both upper and lower ghosts are eliminated.

Abstract: Methods of triggering a test and measurement instrument having a plurality of inputs include the step of generating a trigger signal in response to every occurrence of any one of a plurality of specified trigger events. A first specified trigger event occurs in at least a first one of the inputs and a second specified trigger event occurs in at least a second one of the plurality of inputs. A specified trigger event may include at least one selected input from the plurality of inputs and a selected activity type. Some methods include configuring each of a plurality of event activity detectors to produce a pulse in a logic signal in response to every occurrence of one of the specified trigger events. The plurality of logic signals are combined in a logical OR circuit to generate the trigger signal. Trigger circuits configured according to these methods are also disclosed.

Abstract: A device with lighting creating the appearance of animations is disclosed herein. The device includes: a first layer of translucent material and a second layer of translucent material, where the first and second layers of translucent material are attached to form a combined piece of translucent material, and where a first image is etched into the first layer and a second image is etched into the second layer; a housing unit including a first LED used solely with the first layer and a second LED used solely with the second layer; control circuitry connected to the first and the second LEDs; and a power source connected to the control circuitry.

Abstract: A load regulation device for controlling the amount of power delivered to an electrical load may be able to calibrate the magnitude of an output voltage of the load regulation device in order to control the magnitude of a load voltage across the electrical load to a predetermined level. The load regulation device may receive the feedback from a calibration device adapted to be coupled to load wiring near the electrical load. The feedback may indicate when the magnitude of the load voltage across the electrical load has reached a predetermined level. The load regulation device may gradually adjust the magnitude of the output voltage, receive the feedback from the calibration device, and then use the feedback to determine the magnitude of the output voltage corresponding to when the magnitude of the load voltage across the electrical load has reached the predetermined level.

Abstract: Lighting system control based on lighting playlist(s) is disclosed. In one example implementation, a method includes obtaining, by one or more computing devices, data indicative of a user request for a selected lighting playlist from a plurality of lighting playlists. The user request can be implemented via a user interaction a user interface. In response to the request, the method can include obtaining, by the one or more computing devices, data associated with the selected lighting playlist from one or more memory devices. The method can include communicating, by the one or more computing devices, the data associated with the selected lighting playlist for control of a lighting system in accordance with the lighting playlist.

Abstract: A lighting system includes a computer, and a grow light array operatively coupled to the computer, wherein the grow light array includes a plurality of grow lights. The computer determines a location parameter of each grow light of the grow light array, wherein the location parameter corresponds to the location of a corresponding grow light. The grow light array adjusts an intensity of light to drive a light intensity sense parameter to match a desired light intensity sense parameter.

Abstract: A discharge lamp drive device includes a discharge lamp driver adapted to supply a drive current to a discharge lamp having a first electrode and a second electrode, a control section adapted to control the discharge lamp driver, and a storage section adapted to store a plurality of drive patterns of the drive current. The control section is configured to select one drive pattern of the plurality of drive patterns based on machine learning, and execute the selected drive pattern. In a case in which a predetermined condition is fulfilled, the control section executes a predetermined drive pattern of the plurality of drive patterns without selecting and executing the drive pattern based on the machine learning.

Abstract: There is provided a current control circuit for a power converter. The power converter has a primary circuit for receiving a supply current across a first supply rail and a second supply rail. There is a primary connection in the primary circuit. The power converter also has a secondary circuit providing an output current. There is a secondary connection in the secondary circuit. The secondary connection is connected to the primary connection. A controller controls one or more switches in the primary circuit to control the output current. The nature of the power converter is such that it has a reactive circuit which produces a reactive current. The current control circuit comprises a current sensing circuit connected to bypass or cancel the reactive current. The controller is connected to the current sensing circuit and controls the one or more switches based on a signal current sensed by the current sensing circuit.

Abstract: An embodiment of a light source device according to the invention includes: a light source unit configured to emit light; a first optical element on which the light emitted from the light source unit is incident; a first drive unit configured to rotate the first optical element; and a control unit configured to control the light source unit and the first drive unit. The control unit is configured to continue rotating the first optical element during a first period until a first predetermined time passes after the light source unit is turned off.

Abstract: An electronic converter (1) comprises a pair of input terminals (IN+, IN?) particularly suitable to be connected to a power supply unit (10) with a constant electric current output, and a pair of output terminals (OUT+, OUT?) particularly suitable to be connected to an electrical load (5). The electronic converter (1) further comprises an electric current conversion stage (2) connected to said input terminals (IN+, IN?) and to said output terminals (OUT+, OUT?), and a controller (3) connected to the electric current conversion stage (2) and particularly suitable to control the electrical energy output from the electronic converter (1).

Abstract: A lighting system includes an LED controller, and an LED array which includes first and second LED sub-arrays, wherein the LED array is operatively coupled to the LED controller. The lighting system includes an antenna in communication with the LED controller. First and second wavelength spectrums are provided by the first and second LED sub-arrays, respectively, and are adjustable in response to adjusting an input signal provided to the antenna.

Abstract: A method of lighting control includes detecting, by a control device, whether an AC power is available, where the availability of the AC power is controlled by a switch. The method further includes providing, by a driver, a driver power to a light source if the driver power was not provided to the light source when the AC power was last available. The driver generates the driver power from the AC power.

Abstract: A visible light communication device management method and apparatus are disclosed. According to one aspect of the present disclosure, an object of the present disclosure is to provide an apparatus and method for checking and managing a membership of a terminal, such as a communication state and a location of a terminal managed by the server.

Abstract: In many power electronics systems, there is an intermediate DC-link stage for facilitating the power processing of different sources to their loads. A device called a plug-and-play ripple pacifier (RP) directly plugged into the DC-link, and actively removes undesired DC-link ripple, thereby eliminating the reliance on electrolytes capacitors for stabilizing the system and remove ripple. Importantly, the use of this device is non-invasive to the operation of its host systems, and requires no modification of existing hardware. It is suitable for the protection of DC utilities/systems and can also be used as a direct replacement of ripple-canceling E-Caps in power converters device.

Abstract: A lighting system, including: light emitting elements; a reset switch operable in a first and second state; non-volatile reset memory configured to record the state of the reset switch when power is provided to the system; a wireless communication system; non-volatile communication memory configured to store default settings and configuration settings; a control system operable, in response to initial power provision to the control system, between: a configured mode when an instantaneous reset switch state matches the recorded state, the configured mode including: connecting the wireless communication system to a remote device based on the configuration settings, receiving instructions from the remote device, and controlling light emitting element operation based on the instructions; and a reset mode when the instantaneous reset switch state differs from the recorded state, the reset mode including: erasing the configuration settings from the communication memory and operating the system based on the default

Abstract: A method of controlling an LED driver can include: generating a sinusoidal half-wave signal having the same frequency and phase as an AC input voltage by utilizing a phase-locked loop; generating a sampling signal of a peak value of an inductor current in a power stage circuit of the LED driver; generating a loop compensation signal in accordance with the sinusoidal half wave signal and a signal representing an output current of the power stage circuit; and generating a switching control signal for controlling the power stage circuit in accordance with the sampling signal and the loop compensation signal.

Abstract: Structures and methods for a multi-bit phase change memory are disclosed herein. A method includes establishing a write-reference voltage that incrementally ramps over a write period. The increments of the write-reference voltage correspond to discrete resistance states of a storage cell of the multi-bit phase change memory.

Abstract: An illumination device and method is provided herein for calibrating individual LEDs and photodetector(s) included within the illumination device, so as to obtain a desired luminous flux and a desired chromaticity of the device over time as the LEDs age. Specifically, a calibration method is provided herein for characterizing each emission LED and each photodetector separately. The wavelength and intensity of the illumination produced by each emission LED is accurately characterized over a plurality of different drive currents and ambient temperatures, and at least a subset of the wavelength and intensity measurement values are stored with a storage medium of the illumination device for each emission LED. The responsivity of the photodetector is accurately characterized over emitter wavelength and photodetector junction temperature, and results of said characterization are stored with the storage medium.