Abstract: A power supply includes an inverter configured to convert direct current (DC) power into alternating current (AC) power, an impedance matching circuit configured to supply the AC power to a load, and a controller configured to detect a delay time of an output voltage and an output current output to the impedance matching circuit and the load and to adjust a frequency of the output voltage according to the detected delay time.

Abstract: A method for supplying power to an inductive load (12) using an H-bridge (2) power supply structure, comprising a first block B1 of steps for detecting an anomaly using a “DIAG ON” diagnostic method, a second block B2 of steps for detecting an anomaly using a “DIAG OFF” diagnostic method, and finally a third block B3 of steps for discriminating the detected anomaly and for confirming a short circuit at the inductive load (12) anomaly.

Abstract: System and method for dimming control. For example, the system for dimming control includes: a signal converter configured to receive a dimming signal and convert the dimming signal to a converted signal associated with a first duty cycle; and a current controller configured to receive the converted signal and determine a magnitude of a current that flows through one or more light sources based at least in part on the converted signal; wherein the signal converter is further configured to: receive an analog voltage signal as the dimming signal; and convert the analog voltage signal to the converted signal based at least in part on the analog voltage signal; wherein the signal converter is also further configured to: receive a pulse-width-modulation signal as the dimming signal; and convert the pulse-width-modulation signal to the converted signal based at least in part on the pulse-width-modulation signal.

Abstract: A light source module includes at least one substrate, at least one main light source and at least one auxiliary light source. The at least one main light source and the at least one auxiliary light source are disposed on the at least one substrate. The main light source comprises a first main light emitter configured to emit a first main light having a first number of peak wavelengths and a second main light emitter configured to emit a second main light having a second number of peak wavelengths. In addition, the auxiliary light source is configured to emit a third auxiliary light having a third number of peak wavelengths. The first number of peak wavelengths can be different from the second number of peak wavelengths. A peak wavelength of the second main light can be longer than all of the peak wavelengths of the first main light.

Abstract: A lighting device, such as a light-emitting diode (LED) light source, may operate in an interim operable state to avoid and/or prevent undesirable characteristics in the light emitted by the lighting device (e.g., strobing and/or flickering of a brightness of the light and/or shifting or change of a color of the light). When operating in a normal state, the control circuit may determine if a measured value of a first operational characteristic (e.g., a forward voltage of an emitter of the lighting device) is outside of a range and operate in the interim operable state if the measured value of the first operational characteristic is outside of the range. When operating in the interim operable state, the control circuit may adjust a drive current for the emitter in response to a measured value of a second operational characteristic (e.g., a forward voltage of a detector of the lighting device).

Abstract: A remote controller is provided. The remote controller includes a motion sensing circuit and a wireless communication circuit electrically connected to the motion sensing circuit. The motion sensing circuit determines whether or not a motion of the remote controller complies with one of multiple reference motions. When the motion of the remote controller complies with one of the reference motions, the wireless communication circuit is switched from a sleep state to a working state. The wireless communication circuit that is in the working state determines whether or not a received signal strength indication between the remote controller and a controlled device is greater than or equal to a strength threshold. When the received signal strength indication is less than the strength threshold, the wireless communication circuit is switched from the working state to the sleep state.

Abstract: The present disclosure relates to a transceiver (100) comprising a first and second terminal, a signal generation unit a signal generation unit (110) for generating a differential output voltage (Vout) between the terminals, a sensor unit (112) configured to measure an electric current (Iout) when flowing through one of the terminals, and a control unit (114) for controlling the signal generation unit, wherein the control unit is configured to control the signal generation unit during a calibration phase to generate a predetermined differential output voltage reference pattern (140), wherein the sensor unit is configured to measure a calibration current unit during the calibration phase, and wherein the control unit is configured to calibrate the signal generation unit depending on the calibration current. The present disclosure also relates to a method for the transceiver.

Abstract: A method and a device for backlight driving, and a computer equipment. The method includes steps of: generating local dimming data, the local dimming data includes a frame refresh rate of a display panel and luminance data of each of a plurality of backlight zones; generating a gray-scale clock signal according to the frame refresh rate in the local dimming data, a frequency of the gray-scale clock signal is matched with the frame refresh rate in the local dimming data; generating drive data according to a plurality of luminance data in the local dimming data; and driving the plurality of backlight zones according to the gray-scale clock signal and the drive data.

Abstract: Systems, methods, and modes for commissioning of a building control system comprising at least one controller and a plurality of electronic devices installed in a building and comprising at least one light source adapted to illuminate light of a plurality of colors. The at least one controller is adapted to iteratively divide a selected number of the plurality of electronic devices into groups of electronic devices and command each group of electronic devices to illuminate a different color, receive an identification of an illuminated color of an electronic device to be commissioned, and select electronic devices belonging to a group commanded to illuminate a color that matches the identified illuminated color until the electronic device to be commissioned is identified.

Abstract: A magnetic induction circuit, a magnetic-controlled switch circuit, a magnetic-controlled device and a magnetic-controlled lamp. The magnetic induction circuit includes a magnetic induction module, a voltage comparison module and a voltage output module. The magnetic induction module is configured to sense an external magnetic field to generate a first voltage signal. The voltage comparison module is configured to receive the first voltage signal, and output a second voltage signal. The voltage output module is configured to process the second voltage signal and output a third voltage signal.

Abstract: In certain embodiments, provided is intelligent solar powered lamps and methods of controlling operation of the same. In one example, the intelligent solar powered lamp comprises a LED component; a solar panel component; a battery component; a converter that operatively connects with the LED component, solar panel component and the battery component; and a microcontroller that operatively connects with the battery component and electrically communicates with the converter. In some embodiments, the microcontroller comprises a memory that stores an executable, software program configured to control the operation of the lamp. Other embodiments are described herein. In certain embodiments, the intelligent solar powered lamps provide an intelligent mode which utilizes machine learning technologies to optimize operations and to maximize performance and user experience.

Abstract: An LED system includes an LED array, a plurality of driver circuits, a power supply, a bus and a feedback circuit. Each of the plurality of driver circuits is connected to and driving one of a plurality of LED subarrays in the LED array. Each of the plurality of driver circuits includes a comparator circuit, a local voltage register, and a global voltage register. The comparator circuit determines, as a local minimum voltage, a lowest voltage in the corresponding LED subarray. The global minimum voltage is determined by comparing all the local minimum voltages. The feedback circuit provides the power supply with a feedback signal reflecting the global minimum voltage and causes the power supply to adjust the voltage output to the LED array.

Abstract: A converter for a lighting control device for controlling lighting comprises: a filter circuit configured to remove a noise component included in an input power; a full-wave rectifier circuit configured to generate a full-wave rectified power from an input power from which a noise component has been removed; a power conversion circuit configured to generate a driving power of lighting by using a full-wave rectified power; and a dimming control circuit configured to output a dimming control signal for adjusting a driving power to the power conversion circuit, according to a dimming level indicating brightness of lighting, wherein the dimming control circuit outputs a first control signal to the full-wave rectifier circuit when the dimming level is less than a first reference value, and in response to the first control signal, the combined capacitance of the full-wave rectifier circuit is reduced, so that total harmonic distortion (THD) is reduced.

Abstract: A load control device for controlling power delivered from an AC power source to an electrical load may comprise a thyristor, a gate current path, and a control circuit. The control circuit may be configured to control the gate current path to conduct a pulse of gate current through a gate terminal of the thyristor to render the thyristor conductive at a firing time during a half-cycle of the AC power source. The control circuit may operate in a first gate drive mode in which the control circuit renders the gate current path non-conductive after a pulse time period from the firing time. The control circuit may operate in a second gate drive mode in which the control circuit maintains the gate current path conductive after the pulse time period during the half-cycle.

Abstract: An apparatus that physically and electrically attaches to an existing AC electrical switch, and controls the power to the electrical load via outputs from the existing electrical switch or from wireless commands from a remote controller.

Abstract: An LED lighting system includes switching circuitry adjustably driving a string of LEDs and being controlled by a reference current and an enable signal. A controller generates the reference current and enable signal based upon a PWM signal such that the switching circuitry: sources a first LED current to the string of LEDs that is proportional to a duty cycle of the PWM signal when the duty cycle is greater than a threshold duty cycle to thereby perform analog dimming; and sources a second LED current to the string of LEDs that has a duty cycle proportional to the duty cycle of the PWM signal when the duty cycle of the PWM signal is less than the threshold duty cycle, such that an average LED current delivered to the string of LEDs is proportional to the duty cycle of the PWM signal to thereby perform digital dimming.

Abstract: A variable light distribution light source includes an array-type light-emitting device. The array-type light-emitting device includes a power supply terminal and multiple pixel circuits electrically coupled and spatially arranged in a matrix. A power supply circuit includes a power supply unit that supplies electric power to the array-type light-emitting device. An output of a DC/DC converter is coupled to the power supply terminal VDD of the array-type light-emitting device via an output terminal. A voltage setting circuit generates a controllable correction voltage. A feedback circuit generates a feedback voltage based on the correction voltage and the control target voltage that corresponds to the output voltage of the DC/DC converter, and supplies the feedback voltage to a feedback pin of a converter controller.

Abstract: A compound semiconductor integrated circuit is disclosed, which includes biasing circuitry for generating a bias voltage at a bias output node. The biasing circuitry comprises a first circuit branch configured to extend between a defined voltage and a supply voltage. The first circuit branch includes a first transistor configured as a current source to generate a defined current in the first circuit branch and a controllably variable resistance. The bias output node is coupled to the first circuit branch at a first node which is between the controllably variable resistance and the first transistor. The biasing circuitry is operable so that the resistance value of the controllably variable resistance varies with a control voltage so as to vary the value of the bias voltage.

Abstract: An electro-optical apparatus is provided with an active-matrix drive circuit that applies a voltage based on an image signal tone to a light-emitting element, and includes: a first transistor for driving, a source of the first transistor being connected to an anode of the light-emitting element; a second transistor for setting an anode voltage, the second transistor being connected between the anode and a power source, and determining a voltage applied to the anode; and a holding capacitor and a third transistor connected to the anode for holding the anode voltage during a light-emission period.

Abstract: The present invention relates to a method of resetting a lighting device control apparatus by using a wall switch, capable of resetting an AP setting of the lighting device control apparatus more conveniently in a smart residential lighting device network system including: a plurality of lighting devices provided in an indoor space; a plurality of lighting device control apparatuses for individually or collectively controlling the lighting devices; a plurality of APs configured to perform WiFi communication with the lighting device control apparatuses, respectively; a user terminal for remotely controlling the lighting devices; a lighting device server configured to transmit a lighting device control signal generated by the user terminal to a lighting device control apparatus of a lighting device corresponding to the lighting device control signal; and a home gateway configured to perform relay between the APs and the lighting device server.

Abstract: A mobile device may include a power supply configured to generate a supply voltage, a power converter configured to generate a converted voltage from the supply voltage wherein the converted voltage is significantly different than the supply voltage, and a plurality of power domains. The plurality of power domains may include a first power domain that is global to the mobile device and comprising a first plurality of electronic components powered from the converted voltage and a second power domain that is global to the mobile device and comprising a second plurality of electronic components powered from the supply voltage, wherein power requirements of each of the second plurality of electronic components are significantly higher than power requirements of each of the first plurality of electronic components.

Abstract: Inductively coupled plasma (ICP) RF power delivery systems are disclosed that include at least two ICP coils. At least one of the ICP coils is directly driven by an RF resonant power amplifier that includes a resonant tank comprising the ICP coil. A controller is configured to control the power into the direct driven ICP coil by varying a corresponding DC voltage source and simultaneously varying operating frequency into the ICP coil by allowing a resonant voltage waveform across a corresponding open switch network to rise and then fall to substantially zero volts before closing the corresponding switch network for a remainder of an RF cycle. Some variations comprise at least one passive ICP coil that is arranged and configured to be inductively coupled to the first ICP coil, and the passive ICP coil is terminated by an independently adjustable impedance.

Abstract: A driving circuit and a panel are provided. In the driving circuit, a current mirror module is configured to output different currents according to different control signals, a dimming module is connected to the current mirror module and configured to amplify the currents to generate driving currents, and a light emitting device is connected to the dimming module and correspondingly emits light with different brightness according to different driving currents.

Abstract: A vehicle infrared lamp system mounted on a vehicle equipped with an infrared camera includes: an infrared light source; a rotating reflector; an other-vehicle position acquisition unit configured to acquire position information of another vehicle; and a control unit configured to control a lighting state of the infrared light source based on the position information of the other vehicle acquired by the other-vehicle position acquisition unit such that a dimming region where radiant intensity of infrared light is lower than radiant intensity of any other region is formed on at least a part of the other vehicle.

Abstract: A resonant converter has a primary resonant tank circuit and a secondary resonant tank circuit. An inverter circuit converts an input DC voltage received by the resonant converter at an input voltage node to a pulsating signal that is fed to the primary resonant tank circuit to generate a resonant tank current that flows through a primary winding of a transformer. The resonant tank current induces current in a secondary winding of the transformer. The induced current is rectified by a rectifier and the rectified signal is filtered to generate an output DC voltage at an output voltage node. The secondary resonant tank circuit is disposed between the secondary winding of the transformer and the output voltage node, and a tank node of the secondary resonant tank is connected to the primary resonant tank circuit through the inverter circuit.

Abstract: A location identification system (1) of the present invention includes a plurality of lighting apparatuses (50a1), . . . , (50c3) installed above a plurality of products displayed inside a room, a search apparatus (20) configured to allow a customer to search for and designate the product, and a management apparatus (10) capable of communicating with the plurality of lighting apparatuses (50a1), . . . , (50c3) and the search apparatus (20). The search apparatus (20) transmits identification information of a target product that is designated by the customer to the management apparatus (10). The management apparatus (10) changes, in a case where the identification information of the target product is received from the search apparatus (20), an emission color of a lighting apparatus (50a1), . . . , (50c3) associated with the target product to a pre-specified emission color.

Abstract: An LED lamp and a power supply module thereof are provided. The power supply module includes a driving circuit, a OVP circuit, and an impedance detection circuit. The OVP circuit is configured to determine whether an OVP condition is detected by sampling the driving signal, and the impedance detection circuit is configured to determine whether a user touching state is detected. When either the OVP condition or the user touching state is detected, the power switch of the driving circuit will be controlled to limit the amount of a current flowing through the power switch. In addition, the impedance detection circuit could detect the user touching state by comparing signals with a defined level sampled during each pulse, thus enhancing the detection accuracy.

Abstract: A method of preventing a backlight module from overheating and a display device are provided. The method can prevent backlight partitions from having a long-time high-brightness operation and causing the backlight module to overheat by obtaining a driving current of each backlight partition in the backlight module, judging whether a brightness of each backlight partition in the backlight module exceeds a reference brightness, and adjusting the brightness of each backlight partition that exceeds the reference brightness to a target brightness.

Abstract: Modules, systems and methods that disinfect surfaces using ultraviolet (UV) light are disclosed. In one aspect, a UV light-emitting module comprises an enclosure including an aluminum rear wall comprising a ventilation opening and a face plate spaced from the rear wall and comprising a light-transmitting aperture. Four aluminum sidewalls extend between the rear wall and the face plate, with at least one sidewall comprising a ventilation opening. At least one fluoropolymer UV light emitter support within the enclosure seats a plurality of UV light emitters that each comprise an elongated lamp comprising a first end having a first terminal and an opposing second end having a second terminal. Lead wires electrically couple the terminals of the elongated lamps to a power source.

Abstract: A current detection circuit configured to detect a resonant current of a power supply circuit. The power supply circuit includes a resonant circuit that has an inductor and a first capacitor having a first end and a second end. The current detection circuit includes a second capacitor having a first end and a second end, and a non-linear circuit provided between the second end of the second capacitor and the second end of the first capacitor. The first end of the second capacitor is coupled to the first end of the first capacitor.

Abstract: A light source comprises at least one light-emitting component, in particular a component emitting ultraviolet light and/or a semiconductor component, and a line system, through which a cooling fluid can flow in a flow direction, for controlling the temperature of the at least one light-emitting component, and also a first and a second cooling-fluid pressure sensor, which are arranged one after the other in the line system in the flow direction, and an electronics unit which is connected to the first and second cooling-fluid pressure sensors and configured to determine at least one diagnostic, control and/or regulating value on the basis of pressures captured by the first cooling-fluid pressure sensor and by the second cooling-fluid pressure sensor.

Abstract: A display device including: a display panel; a current compensation circuit executing a current compensation operation in which a load is calculated based on input image data, and output compensation image data is generated by compensating for the input image data based on the load; a data driver converting the compensation image data into a data voltage based on a gamma reference voltage and a data driving voltage, and outputting the data voltage; a current sensing circuit sensing a driving current of the display panel and comparing the driving current with a preset reference current to output a protection signal; a voltage generator generating a driving voltage, the gamma reference voltage, and the data driving voltage; and a voltage control circuit generating a first voltage control signal to control a first target compensation value of the gamma reference voltage or the data driving voltage in response to the protection signal.

Abstract: A LED driver chip includes driver circuits, each being coupled to a different pin and including a fault-detection circuit. Each fault-detection circuit includes a force circuit forcing current to a force node, and a sense circuit including a current sensor coupled to the force node, and a comparator comparing a voltage at the force node to a reference voltage to generate a comparison output. Control circuitry, in a pin-to-pin short detection mode, activates the force circuit of a first of the driver circuits and activates the sense circuit of a second of the driver circuits, in a pin-to-ground short detection mode, activates the force and the sense circuit of the same driver circuits. The comparison output of the comparator of the activated sense circuit, if is higher or if lower of the reference voltage, indicates if short between pin or to ground, respectively, is present.

Abstract: A method and apparatus of adjusting parameter for an electrical device. The method of adjusting parameter for an electrical device, the electrical device comprising a converter, the method including: calculating a performance evaluation parameter of the electrical device, when the converter using a parameter value table for running; adjusting at least one parameter value in the parameter value table of the converter according to an input parameter so as obtain the optimized performance evaluation parameter of the electrical device and use the adjusted parameter value table corresponding to the optimized performance evaluation parameter for running. Therefore, the self adapting parameter in the table will be enable to find the best performance for different input and load conditions and better performance of Harmonics will not limit the operation range.

Abstract: An automated dimming load controller automatically measures the relationship between the current draw and the dimmer setting for each light or group of lights connected to the load controller. Once measured, the relationship between the current draw and the dimmer setting can be used to enable the dimmer controller to adjust the lights between their minimum and maximum effective illumination. This automatic setting of the dimmer controller may be performed regularly to accommodate changes in performance or replacement of any of the connected lights, drivers or ballasts.

Abstract: Apparatus and methods for power amplifier signal limiting are disclosed. In certain embodiments, a power amplifier system includes a power amplifier that amplifies a radio frequency input signal, and a signal limiter operable to limit a signal power of the power amplifier when the radio frequency input signal exceeds a threshold. The signal limiter includes a radio frequency detector configured to generate a detection signal based on detecting a power level of the radio frequency input signal, and a latch configured to lock the signal limiter into an attenuating mode in response to the detection signal indicating that the threshold is exceeded.

Abstract: A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.

Abstract: An LED driver control circuit suitable for a LED driver operating under the Line Switch dimming protocol. The LED driver control circuit generates a control signal that can switch between a voltage level at a first node and a voltage level at a second node. The first node is connected to a three-phase input by a first voltage control circuit and the second node is connected to the three-phase input a second voltage control circuit. The first voltage control circuit controls the voltage level at the first node to be, in a first embodiment, greater than or, in a second embodiment, less than a voltage level of each phase of the 3-phase input for at least part of a cycle of the respective phase. The second voltage control circuit controls the voltage level at the second node to be, in the first embodiment, less than or equal to or, in the second embodiment, greater than or equal to a voltage level of each phase of the 3-phase input for the entirety of the cycle of the respective phase.

Abstract: A LED power supply with bi-level dimming receives an input voltage to supply power to an LED lamp, and adjusts the brightness of the LED lamp according to whether an external detection switch is triggered to be turned on. The LED power supply includes a conversion circuit, a switch, and an oscillation circuit. The conversion circuit converts the input voltage into an output voltage, and provides the output voltage to supply power to the LED lamp so as to control the LED lamp to provide a first brightness. The oscillation circuit provides a dimming signal with a fixed frequency and a duty cycle to the switch when the external detection switch is turned on so as to turn on and turn off the switch. The switch correspondingly adjusts the output voltage according to the dimming signal to control the LED lamp to provide a second brightness.

Abstract: A gate drive circuit includes a charging circuit, a first shutdown circuit and a second shutdown circuit, and a first startup circuit and a second startup circuit. The charging circuit includes an energy storage element, a first switch unit and a second switch unit. The energy storage element switches between charging and discharging states based on control signals responded by control terminals of the first switch unit and the second switch unit. Control terminals of the first shutdown/startup circuit and second shutdown/startup circuit respond to the shutdown/startup control signal when the energy storage element is in the discharging state so that output terminals of the first shutdown/startup circuit and the second shutdown/startup circuit output two shutdown/startup signals to the sub-pixel.

Abstract: A lighting apparatus includes a rectifier, a loading module and a current supplemental module. The rectifier is connected to an output of the AC power for receiving an AC signal. The rectifier converts the AC signal to a positive wave signal. The loading module is disposed at an output of the rectifier. The loading module includes multiple loading units connected in series. Output of each loading unit is connected to a current limit module. Each current limit module has a voltage conductive threshold and a working cycle dispatched to each current limit module according to the positive wave signal. The current supplemental module is connected to an output of the rectifier and an input of the loading module. The current supplemental module charges the current limit module during the working cycle and outputs current to the loading module when the positive wave signal is not sufficient to drive the loading module.

Abstract: A power management and smart lighting system is provided that enables efficient distribution of DC power to various building features, including LED lighting. The power management system includes an intelligent power supply unit configured to convert AC power drawn from a building load center into a deadband DC waveform. The deadband DC power generated by the intelligent power supply unit is then transmitted over power-with-Ethernet cables to a plurality of distributed intelligent drivers, each configured to intelligently power one or more LED troffers. The intelligent drivers may be daisy-chained to one another by the power-with-Ethernet cables, enabling a power-ring architecture. To enable easy control of the drivers, intelligent sensors can be distributed throughout the topology and connected to the drivers (e.g., via power-with-Ethernet cables) to enable a wide array of lighting control options.

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: An optical output device is described that includes one bus system. The bus system includes two bus wires of a bus, two bus units and one bus control unit. The two bus units may include one optical output element one output control unit whose output is connected to the one optical output element a first storage unit for storing address data of the respective bus unit a second storage unit for storing a counter value, a comparison unit whose inputs are connected to the first storage unit and to the second storage unit, and a control unit whose input is connected to an output of the comparison unit and which controls the takeover of data from the bus into the output control unit depending on an output signal or on output data of the comparison unit.

Abstract: Systems and methods for adaptive energy storage in an illumination system are disclosed herein. An example method includes (1) obtaining, by one or more processors, data stored at a memory of a illumination unit; (2) obtaining, by one or more processors, a temperature value from a temperature sensor; (3) analyzing, by one or more processors, the obtained data and the temperature value to determine a minimum capacitor voltage to operate LEDs in accordance with an illumination cycle; and (4) control, by one or more processors, a voltage controller to convert an input voltage to the voltage controller to the determined minimum capacitor voltage, wherein the voltage controller is configured to apply the determined minimum capacitor voltage to a capacitor.

Abstract: An image display apparatus is disclosed. The image display according to an embodiment of the present disclosure includes a signal processing device including a first logic circuit to process a first voltage range of a voltage level of the input signal, a second logic circuit to process a second voltage range of the voltage level of the input signal, higher than the first voltage range, and a protection control circuit including a protection switch and a protection controller for controlling the protection switch, wherein the protection switch is turned on based on the protection controller being turned off or powered down. Accordingly, a breakdown phenomenon can be reduced in case of power off or power down.

Abstract: An LED driver for an LED lamp, which also comprises an LED load. The LED driver is adapted to connect to an input source at a first and second terminal. The LED driver comprises a switching arrangement configured to enable a controller to control at least a magnitude and phase of the voltage between the first and second terminals. The phase of the voltage between the first and second terminals may be defined to control an amount of power that flows from the input source to power the LED lamp.

Abstract: The invention provides a visible light communication system with adaptive dimming and a modulation and demodulation method. The system includes: a source; an adaptive M-PAM modulator, separately modulating a signal transmitted by the signal source into a first and a second electrical signal; and a dual-path pulse generator, alternately generating a first and a second pulse control signal, where the first and the second pulse control signal are both periodic signals, where when a remaining operating duration of a high level of the first pulse control signal equals to a time of a rising edge of the second pulse control signal, the second pulse control signal starts to be generated, and when a remaining operating duration of a high level of the second pulse control signal is equal to a time of a rising edge of the first pulse control signal, the first pulse control signal starts to be generated.

Abstract: An inspection device includes a reader including a light source and a light receiving element, a white reference section, a memory storing reference data of a white pixel value, and a controller. The controller is configured to cause the light source to emit light toward the white reference section, and receive a pixel signal output from the reader when the light receiving element receives reflected light from the white reference section, determine a rate of decrease in a pixel value relative to the reference data, based on the received pixel signal, when the rate of decrease is equal to or higher than a first threshold, output an instruction signal concerning an instruction to clean the reader, re-determine the rate of decrease in response to receiving input of a completion signal concerning completion of cleaning of the reader, and update the reference data using the re-determined rate of decrease.

Abstract: A method and light emitting diode (LED) illumination device comprising multiple emitter modules are provided. In one embodiment, the method includes bringing to a level insufficient to produce illumination the respective drive currents of all except one of multiple emission LED elements within respective first and second emitter modules for the duration of a measurement interval within respective first and second series of measurement intervals. The measurement intervals are interspersed with periods of illumination, and the first and second series of measurement intervals are separated by respective first and second offsets from a timing reference. An embodiment of an illumination device includes multiple emitter modules, where each emitter module includes multiple emission LED elements and one or more photodetectors. The illumination device further includes a lamp control circuit adapted to perform steps of the method.