Abstract: An intelligent power supply includes: constant current/constant voltage module; dimming control module which is located at a rear end of the constant current/constant voltage module and is electrically connected thereto; switching circuit for electrically connecting the constant current/constant voltage module and load, which is controlled by the dimming control module; the intelligent power supply further including voltage sampling module disposed between the constant current/constant voltage module and the dimming control module; and the power supply voltage of the voltage sampling module is provided by the constant current/constant voltage module, and the dimming control module detects the voltage signal of the sampling resistance of the voltage sampling module in real time; the operating power of the dimming control module is provided by the power supply voltage of the voltage sampling module.

Abstract: Various embodiments include a lighting system comprising: a first light; a second light; a first controller for adjusting a first brightness of the first light; a second controller for adjusting a second brightness of the second light; and a generator for generating a trigger signal. The first controller and the second controller are initiated by the trigger signal, to simultaneously start a control computation procedure.

Abstract: A first wireless control device may be associated with a second wireless control device in response to the movement of the first wireless control device in relation to the second wireless control device. The second control device may determine whether the signal strength of the wireless signals received from the first wireless control device has changed, and may associate the first wireless control device with the second wireless control device if the signal strength of the received wireless signals has changed. The second control device may be disassociated with the first control device by moving the first wireless control device in relation to the second wireless control device. The second control device may disassociate the first control device when the signal strength of subsequent wireless signals received from the first wireless control device has changed.

Abstract: A lighting system suitable for receiving two kinds of power signals includes a light emitting unit, a switch control circuit, first and second power adjustment circuits, and first and second switches. The switch control circuit is electrically connected to the light emitting unit, the first and second switches. When the light emitting unit and the switch control circuit receive a first power signal, the switch control circuit turns on the first switch and turns off the second switch, so that a first current drives the light emitting unit to emit. When the light emitting unit and the switch control circuit do not receive the first power signal and the second power adjustment circuit receives the second power signal, the switch control circuit turns off the first switch and turns on the second switch, so that a second current drives the light emitting unit to emit.

Abstract: A microcontroller based multifunctional electronic switch uses an external control device design for generating, detecting and converting an external control signal into a message carrying sensing signal interpretable and executable to a microcontroller. Based on a signal format of said message carrying sensing signal received said microcontroller operates to perform at least an on/off switch control mode, a dimming control mode and an illumination level switching control mode. When said signal format of said message carrying sensing signal detected is a short voltage signal, said microcontroller operates to perform said on/off control mode. When said signal format of said message carrying sensing signal detected is a long voltage signal said microcontroller operates to perform said dimming control mode. When said signal format of said message carrying sensing signal detected is a constant voltage signal, said microcontroller operates to perform said illumination level switching control mode.

Abstract: A controller includes a feedback sensing circuit that generates a feedback current during a first time interval in a switching period of a power converter based on an output voltage of the power converter and to generate a digital sensing signal indicative of a duration of the first time interval, and a feedback signal generator that determines a magnitude of the feedback current that flows during the first time interval based on a value of the digital sensing signal and to generate a digital feedback signal based on the determined magnitude of the feedback current. The controller adjusts the output voltage of the power converter in response to the digital feedback signal.

Abstract: A load control device is configured to generate a control signal having a desired magnitude for controlling a load regulation device adapted to control the power delivered to an electrical load. The load control device may comprise a control terminal arranged to provide the control signal to the load regulation device, a communication circuit for generating the control signal, and a control circuit configured to generate an output signal that is provided to the communication circuit. The communication circuit may be characterized by non-linear operation. The control circuit may adjust the magnitude of the output signal in response to the difference between the magnitude of the control signal and the desired magnitude to adjust the magnitude of the control signal towards the desired magnitude. The control circuit may also be configured to determine if an incompatible load regulation device is coupled to the load control device.

Abstract: If there is an interruption of power to an electrical load while the electrical load is operating at low end, the electrical load may not turn back on when power is restored. This undesired operation may be avoided by detecting the application of power to the electrical load, and automatically increasing the magnitude of a control signal being applied to the electrical load by a sufficient amount for a short period of time after power has been applied. This way, the electrical load may be turned back on to low end, instead of erroneously operating in an electronic off condition.

Abstract: A tubular LED lighting device (10) comprising an LED, a driver (18) for driving the LED, and an electrical connector (14). The lighting device further comprises a thermally triggered switch (16) for prevention of overheating of the electrical connector. The thermally triggered switch is connected in series between the electrical connector and the driver, and the thermally triggered switch is configured to interrupt current in the event of the temperature of the electrical connector meeting a triggering condition. If a significant degree of arcing occurs the electrical connector will heat up such that the triggering condition will be met and the current flow between the electrical connector and the driver will be interrupted. There is also provided a luminaire (20) comprising the tubular LED lighting device.

Abstract: A wireless lighting control system is provided to create a lighting pattern by remotely controlling a plurality of lighting devices, thereby improving a lighting effect. The wireless lighting control system includes a first smart device to receive information necessary for generating a lighting control signal, a first lighting device electrically connected with the first smart device through to wirelessly transmit the lighting control signal, a second lighting device to receive the lighting control signal from the first lighting device to control a lighting unit based on the received lighting control signal, and a second smart device electrically connected with the second lighting device to control a display unit based on the lighting control signal.

Abstract: Embodiments of the present disclosure disclose a method for improving a performance of a pulsed-ultraviolet (PUV) device. The method includes monitoring an input current across a circuit breaker in communication with a UV lamp, where the input current is delivered by a power signal and is interrupted by the circuit breaker upon exceeding a predefined cut-off current; generating a pulse signal having a set of frequencies based on the power signal for driving the UV lamp, where the pulse signal is associated with a predetermined cut-off frequency that increases the input current beyond the cut-off current; determining a predefined threshold current less than the cut-off current; and configuring the pulse signal with multiple distinct pulse frequencies per second for a predefined configuration period based on the input current exceeding the threshold current. The distinct pulse frequencies per second include at least one pulse frequency greater than the cut-off frequency.

Abstract: Provided are an electronic device and a power supply unit, both of which are immersed and directly cooled in a coolant filled in a cooling apparatus. The electronic device includes a carrier substrate having a voltage input terminal for supplying a DC voltage for the electronic device, a plurality of module connectors arranged on one surface of the carrier substrate, a plurality of module substrates, a plurality of supporting plates for holding both ends of the respective module substrates, and a supporting member for supporting the carrier substrate. The voltage input terminal is electrically connected to a voltage output terminal of the power supply unit. Each of the module substrates includes a module connector plug electrically coupled to each of the module connectors.

Abstract: A light-emitting module includes a light emitter including a first semiconductor light-emitting element, a second semiconductor light-emitting element, and a third semiconductor light-emitting element. A first current regulator is to supply the first current to the first semiconductor light-emitting element. The second current regulator is to supply the second current to the second semiconductor light-emitting element. The third current regulator is to supply the third current to the third semiconductor light-emitting element. A control circuit is configured to control at least one of the first current regulator to control the first current, the second current regulator to control the second current, or control the third current regulator to control the third current according to at least one of fluctuation of the first voltage drop, fluctuation of the second voltage drop, or fluctuation of the third voltage drop.

Abstract: A voltage compensation driving circuit is provided. The voltage compensation driving circuit converts input power into output power and auxiliary power. The voltage compensation driving circuit provides a boost control signal according to an output current of the output power, and the boost control signal has a duty cycle corresponding to the output current. The voltage compensation driving circuit boosts the auxiliary power by the boost control signal to generate a compensation voltage and transmits the compensation voltage to a light emitting device string via a boost resistor, so as to linearly control a brightness of the light emitting device string.

Abstract: A cascading LED lights with low power consumption includes a master light string and at least one slave light string. The master light string receives a carry light signal to control LED modules. The at least one slave light string cascades the master light string. A signal intensifier of the slave light string enhances the carry light signal to drive the LED modules. When a voltage of the carry light signal is less than a low-level voltage, the LED modules enter a low-power-consumption mode.

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

Abstract: An electric device may include a first group and a first signal line coupled to the first group. The first group may include a first light-emitting diode (LED), a second LED and a first control circuit. The first LED and the second LED are coupled in series. The first control circuit is coupled to the first LED and the second LED for turning on one of the first LED and the second LED in a first mode, and turning on the first LED and the second LED in a second mode. Number of LEDs enabled in the first mode is less than number of LEDs enabled in the second mode.

Abstract: The invention provides a lighting system and a lighting control component for such a system. The components are battery-operated, and include a remote control signal receiver for receiving commands and configurations during commissioning. A disabling system is provided for enabling and disabling the remote control signal receiver, such that the remote control signal receiver is enabled when a commissioning process of the lighting system is expected and disabled when a commissioning process of the lighting system is not expected. This reduces the power consumption of the component after the commissioning is complete but provides ease of use during commissioning.

Abstract: A color mixing light emitting diode (LED) assembly comprises a carrier and at least three LEDs that are arranged on the carrier and configured to emit light in mutually different colors and together generate an output radiation that corresponds to an additive color mix, wherein each of the LEDs has an individual emission characteristic. The LED assembly furthermore comprises a respective driver input for each of the LEDs to supply the LEDs with electrical energy, wherein the emission characteristics of the LEDs are dependent on the respective energy supply so that the color mix of the output radiation can be set by varying the respective energy supply at the driver inputs. The LED assembly has a calibration information element that includes at least one readable calibration value for each of the LEDs that represents the individual emission characteristic of the respective LED.

Abstract: Disclosed is a backlight test circuit including N circuit blocks. Each circuit block includes M mini-LED circuits, and each mini-LED circuit includes L mini-LEDs and a switching circuit. The L mini-LEDs are connected in parallel or in serial as a mini-LED set. The switching circuit controls the turning on and the turning off of the mini-LED set according to a control signal. N, M and L are positive integers. During a backlight test, in each circuit block, at least one of the mini-LED sets is turned on. By using this backlight test circuit, the abnormal mini-LED circuit can be found. Thus, a producer can only execute a rework process for the abnormal mini-LED circuit without extra cost.

Abstract: Provided is an apparatus including a regulator circuit configured to generate at least one positive supply voltage from at least a portion of a light-emitting diode (LED) driving current passed through an LED to supply power to a component included in a lighting apparatus; and a converter circuit configured to receive a first control signal from the component and output a second control signal for controlling the LED driving current by converting the first control signal.

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 semiconductor device for outputting a control parameter includes a receiving unit, a storage unit and an output unit. The semiconductor device also contains antenna connections, supply connections and at least one output connection for outputting a control parameter signal. The receiving unit contains connections for connection to an antenna, from which the receiving unit receives signals. The receiving unit converts the signals received from the antenna into data. The data are stored in the storage unit. The semiconductor device outputs an output signal at the output connection on the basis of the data stored in the storage unit. The semiconductor device additionally contains a calculation unit which determines the operating hours (time) of the semiconductor device. The output signal depends both on the data stored in the storage unit and on the determined operating hours (time).

Abstract: A lighting apparatus includes a control circuit configured to control a power supply circuit such that a measurement value of an output current measured by a current measuring device approaches a target value. The control circuit is configured to execute a control mode alternatively selected from the plurality of control modes to control the power supply circuit. The plurality of control modes of the control circuit includes at least a first control mode and a second control mode. The first control mode is a control mode of adjusting the target value in accordance with a first direct-current voltage. The second control mode is a control mode which includes adjusting the target value regardless of the first direct-current voltage.

Abstract: An LED driving circuit and a driving method thereof. The LED driving circuit comprises a rectifying circuit (40), a filter circuit (20), a current limiting circuit (10), a detection and control circuit (30), and an LED lamp string. The rectifying circuit is connected to an alternating-current power supply, and the negative electrode of the rectifying circuit is connected to the second end of the filter circuit and the second end of the detection and control circuit; the input end of the current limiting circuit is connected to the positive electrode of the rectifying circuit, the first output end of the current limiting circuit is connected to the positive electrode of the LED lamp string and the input end of the filter circuit, and the second output end of the current limiting circuit is connected to the third end of the detection and control circuit.

Abstract: A display device includes first pixels in a first pixel area, second pixels in a second pixel area, first stages, second stages, and third stages. The first pixels are electrically connected to first signal lines, second signal lines, and data lines. The second pixels are electrically connected to at least a portion of third signal lines, fourth signal lines, or data lines. The first stages supply a first signal to the first and third signal lines. The second stages supply a second signal to the second signal lines and at least one of the fourth signal lines. The third stages supply the second signal to the fourth signal lines other than the at least one fourth signal line connected to the second stages. The second stages are spaced from the third stages.

Abstract: A load control device may control power delivered from a power source, such as an alternating-current (AC) power source, to at least two electrical loads, such as a lighting load and a motor load. The load control device may include multiple load control circuit, such as a dimmer circuit and a motor drive circuit, for controlling the power delivered to the lighting load and the motor load, respectively. The load control device may adjust the rotational speed of the motor load in a manner so as to minimize acoustic noise generated by the load control device and reduce the amount of time required to adjust the rotational speed of the motor load. The load control device may remain powered when one of the electrical loads (e.g., the lighting load) has been removed (e.g., electrically disconnected or uninstalled) and/or has failed in an open state (has “burnt out” or “blown out”).

Abstract: A light source driving circuit includes a rectifier operable for rectifying a voltage from a power source and providing a rectified voltage, a power converter coupled to the rectifier and operable for receiving the rectified voltage and providing an output current, and a light source module coupled to the power converter and powered by the output current. The light source module includes a first light source having a first color, a second light source having a second color, and a current allocation unit coupled to the first light source and the second light source. The current allocation unit is operable for adjusting a current through the first light source and a current through the second light source based on the output current.

Abstract: A load driver for driving a load and an LED module are disclosed. In one embodiment, the load driver comprises a converter circuit comprising a controllable switching element configured to be turned on and off and to perform power factor correction for power from a power supply to the load, wherein a control terminal of the controllable switching element is configured for receiving a startup current via the two output terminals, the controllable switching element configured to be turned on by the startup current. The converter circuit further comprises a first inductor, coupled to the power supply at a first end, and to ground at a second end via the controllable switching element, wherein a first one of the output terminals connects to a second end of the first inductor via a diode forwarded from the first inductor, a second one of the output terminals is coupled to the first end of the first inductor.

Abstract: A lighting apparatus that may comprise a voltage converter operable to supply a current to at least two LED channels coupled between a high voltage rail and a low voltage rail coupled to the voltage converter output is disclosed. The LED channels may be operated to selectively allow a current to flow through them. The lighting apparatus may also have a control module operable to control the total current from the voltage converter and the current through each of the LED channels. The control module may also be operable to set the respective control signals to maintain a constant total current from the voltage converter while permitting aspects of the light output including, the intensity, color, and color temperature to be set and varied. Additionally, the control module may be operable to synchronize the various control signals, obtain a representative sample of the current through the voltage converter, and operate in different modes.

Abstract: A driver circuit and a method for driving a load. The driver circuit has a power supply to provide electrical power at a supply voltage and a PWM control switch to enable and to disable a load current through the load in an alternating manner. In addition, the driver circuit has a storage unit to be charged using the load current through the load. The driver circuit has a sensing unit to provide a charge indication. There is a recycling switch to couple and to decouple the storage unit to or from the power supply. There is a control unit to, repeatedly control the PWM control switch and the recycling switch based on the charge indication and based on a target charge value for the cumulated load current through the load within a cycle.

Abstract: Method and device for PWM dimming of an LED lamp. The LED lamp comprises one or more LEDs and an LED lamp driver for operating the LEDs. The method comprises: generating a PWM signal; and supplying the PWM signal to the LED lamp driver; wherein the PWM signal comprises a mixture of two or more different frequencies.

Abstract: A switch driving device 10 comprises: multichannel switch elements SW1 to SW8 which are connected in parallel to a plurality of light-emitting elements included in a vehicle-mounted light-emitting device; and a logic portion 120 which automatically starts a series of switch driving sequence so that the on-off states of the switch elements SW1 to SW8 are sequentially switched in a predetermined pattern in response to the power-on of the device.

Abstract: The invention relates to a lighting system for at least one light-emitting means (24), in particular for light-emitting diodes, comprising a light fixture (22, 43, 61), in which the light-emitting means (24) and mechanical components like a housing, cooling element, reflector, etc. are located; comprising a convertor (23) for operating the light-emitting means (24); comprising an operating unit (10) having a charge storage (11), like a smart phone, for example, for changing a mode of operation of the lighting system (20), wherein in a first mode of operation, light is emitted across a first light exit surface by the lighting system (20), and in a second mode of operation, light is emitted across a second light exit surface, wherein the first light exit surface and the second light exit surface have different light emission characteristics.

Abstract: Example refrigerators having internal content cameras, and methods of operating the same are disclosed. A disclosed example refrigerator includes a cabinet, an internal compartment disposed within the cabinet, a closing member operatively coupled to the cabinet providing selective access to the internal compartment, two cameras disposed in the compartment and positioned to capture images of different portions of the compartment, two light sources disposed in the compartment, and a controller communicatively coupled with the cameras and light sources and configured to control the light sources to provide two different illuminations for respective ones of the two cameras.

Abstract: A light-emitting diode (LED) driving circuit may include: a power supply circuit, arranged to provide power to a first set of LEDs and a second set of LEDs; a first linear current regulator and a second linear current regulator, where any linear current regulator of the linear current regulators and a corresponding set of LEDs within the sets of LEDs are coupled to each other in series and coupled between a power terminal and a ground terminal of the power supply circuit; and a control circuit, coupled to the linear current regulators, arranged to control the linear current regulators to drive the sets of LEDs, respectively, to make currents respectively passing through the sets of LEDs be substantially equal to each other. Aforementioned any linear current regulator may include a comparator, a power switch, and a resistor, and the control circuit may include a detection circuit and parameter control circuits.

Abstract: Disclosed is an electroluminescent display device integrated with image sensors, including: a display panel having a plurality of pixels; a display panel driving circuit configured to write data of an input image into the pixels during a display mode so as to display the input image with the pixels; and a sensor processing circuit configured to apply a reverse bias to Organic Light Emitting Diodes (OLEDs) disposed in at least some of the pixels during a sensor mode so as to process sensor signals received from the pixels.

Abstract: This disclosure enables various technologies for controlling and charging stationary and mobile devices.

Abstract: Systems and methods for compensating, controlling, mixing and saturating/desaturating colors produced by or emitted from LED artificial light sources through use of multiple channel, LED controllers to control the proportion of constituent colors each to the other, to control the intensity level of the total light output of the mixed, desaturated light during and after color mixing and/or saturation/desaturation by simultaneously increasing and decreasing power to the constituent color LEDs at the same rate, and once a desired color has been produced, changing the intensity/brightness and/or degree of saturation of the produced color without changing the hue of the produced color.

Abstract: A liquid crystal display device including a display unit, a backlight including a plurality of light sources, an LED control circuit configured to output a PWM signal (LED control signal) based on a display synchronization signal, such that the light sources are intermittently lighted, and an LED driver configured to control a drive current that is supplied to the light sources, based on the PWM signal, is provided with a monitoring control unit that is configured to perform monitoring at least one of the PWM signal, the drive current, and the display synchronization signal, as a monitoring target. When an abnormality of the monitoring target is detected, the monitoring control unit controls a waveform of the PWM signal such that the drive current that is supplied to the light sources in the backlight becomes zero.

Abstract: A power converter comprises a regulator, a value-supply system arranged for collecting at least one operating point of the power converter, and a predictor operative to produce updated regulator parameters (such as one or more power supply coefficients) implemented by the regulator to produce an output voltage to power a load. The updated regulator parameters are determined using a process based on the at least one collected operating point samples and predictor parameters obtained from a machine-learning process.

Abstract: A display device includes light-emitting elements, current control elements, a power supply circuit, and a voltage control circuit. The current control elements are connected in series with the corresponding light-emitting elements and control current through the light-emitting elements. The power supply circuit applies a voltage to a series circuit that includes the light-emitting elements and the current control elements. The voltage control circuit controls an output voltage of the power supply circuit to reach a voltage value determined in accordance with forward voltages of the light-emitting elements.

Abstract: A system and approach for remote reading, setting and control of devices such as thermostats. A phone, such as a smartphone, a gateway and a cloud may be incorporated relative to interaction with the device or devices. The gateway may have a hub that has bluetooth communication capabilities with the device. The hub may be connected to a router that in turn is connected to a cloud in a wireless or wired manner. The phone may communicate with the cloud to achieve interaction with the device. The hub may also handle WiFi communications. The gateway may instead be a phone that contains an app which lets operate as a gateway for communications with the cloud. There may be one or more devices that are a part of one or more home area networks that are connected to a gateway via bluetooth and WiFi, and in turn connected to the cloud.

Abstract: A liquid crystal display (LCD) device, a controller thereof, and a driving method thereof are provided. The LCD device can include a liquid crystal display panel configured to display images, on which data lines and gate lines are disposed, and subpixels defined by the data lines and the gate lines are arranged; a gate driver configured to supply a scanning signal to the gate lines; a data driver configured to supply a data voltage to the data lines; and a controller configured to control the gate driver and the data driver, in which the LCD device operates in a first type of inversion when a driving frequency is in a first driving frequency range, and the LCD device operates in a second type of inversion different from the first type of inversion when the driving frequency is in a second driving frequency range different from the first driving frequency range.

Abstract: Systems and methods for dimming control using TRIAC dimmers are provided. An example apparatus for a power conversion system includes: a process-and-drive component configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system. The input signal includes a first pulse associated with a first input period and a second pulse associated with a second input period. The drive signal is associated with a first modulation period for the first input period and a second modulation period for the second input period. The process-and-drive component is further configured to: determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period.

Abstract: Aspects of the subject technology relate to display circuitry such as backlight control circuitry for operating parallel strings of light-emitting diodes (LEDs). A voltage supply circuit of the backlight control circuitry provides a common supply voltage to the strings of LEDs. Headroom control circuitry samples a residual voltage at the end of each string, determines a minimum of the residual voltages, and provides feedback, based on the determined minimum voltage, to the voltage supply circuit. A headroom control feedback loop may be provided including sampling lines coupled to the second end of each string of LEDs for sampling a residual voltage of each string. Headroom control circuitry may modify the supply voltage based on the minimum residual voltage. Sample-and-hold circuitry may be provided that holds the sampled residual voltages until the voltage supply circuit is ready for an update.

Abstract: Methods, systems, and apparatus are described herein for adjusting one or more lighting properties based on skill level of one or more players of a game. In various embodiments, (502) a skill disparity between at least two players of a game may be identified (502). A lighting scheme may be selected (504) to reduce an impact the skill disparity has on an outcome of the game. One or more light sources (104, 304) may be operated (508) to emit light in accordance with the lighting scheme.

Abstract: The present invention discloses a universal LED tube including a metal pin, an automatic dividing frequency network, a high-frequency driver, a low-frequency driver, a isolation circuit and a LED lighting set. The universal LED tube has the advantages of strong universality and high level of safety.

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.

Abstract: A method and illumination device are provided for interference-resistant compensation in light emitting diode (LED) illumination devices. In one embodiment, the method includes bringing to a level insufficient to produce illumination the respective drive current of all except one of multiple emission LED elements for the duration of a first measurement interval and a later-occurring second measurement interval. The first and second measurement intervals are within respective first and second series of measurement intervals 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 emission LED elements, one or more photodetectors, and a lamp control circuit, where the lamp control circuit is adapted to perform steps of the method.