Abstract: A pixel driving circuit proposed in the present application includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a capacitor and a light-emitting device. In the pixel driving circuit, a threshold-voltage compensation is performed on the first transistor, and this can efficiently improve attenuation of electric current of the light-emitting device caused by a drift of threshold voltage of a drive transistor, thereby improving stability of a display panel.

Abstract: A self-adaptive constant-current driving circuit for a three-channel multi-color LED, including a decoder, a two-phase non-overlapping circuit, and a LED constant-current driving circuit, where the decoder determines the number of lighted channels according to a first input signal, and generates a first switch control signal and a second switch control signal; the two-phase non-overlapping circuit modulates the first switch control signal into a first two-phase non-overlapping signal and a second two-phase non-overlapping signal, and modulates the second switch control signal into a third two-phase non-overlapping signal and a fourth two-phase non-overlapping signal; the LED constant-current driving circuit controls an on/off state of the respective channel of LED according to a second input signal, and outputs a current for controlling a brightness of the respective channel of LED according to the first two-phase non-overlapping signal, the second two-phase non-overlapping signal, the third two-phase non-ove

Abstract: The present invention relates to a light-emitting diode (LED) filament (1) configured to provide LED filament light and comprising an elongated carrier (2) comprising a first surface (3) and a second surface (3?) arranged opposite to the first surface (3). The LED filament (1) further comprises a plurality of first light-emitting diodes (4). LEDs, distributed along the first surface (3) of the elongated carrier (2), the plurality of first LEDs (4) being configured to emit a first LED light having a dominant peak wavelength within a first wavelength range, and a plurality of second light-emitting diodes (5), LEDs, distributed along the second surface (3?) of the elongated carrier (2), the plurality of second LEDs (5) being configured to emit a second LED light having a dominant peak wavelength within a second wavelength range being different from the first wavelength range.

Abstract: The present disclosure provides a harmonic suppression apparatus, method, control unit, power supply apparatus, electric appliance equipment, and storage medium, wherein the harmonic suppression apparatus includes a tuning circuit module, which is connected with a first live wire and a second live wire of a three-phase power supply and is configured to perform resonance regulation processing; a PI-type resonant filtering circuit module, which is respectively connected with the tuning circuit module and a third live wire of the three-phase power supply and is configured to perform harmonic filtering processing on the first-phase current and the second-phase current processed by the tuning circuit module and a third-phase current; and a rectification circuit module, which is connected with the PI-type resonant filtering circuit module and is configured to perform rectification progressing and power a load.

Abstract: A programmable lighting system includes a plurality of color channels configured to generate light of different colors, and a light driver configured to drive the plurality of color channels according to a dimmer setting and a correlated color temperature (CCT) setting, and to maintain a constant maximum lumen output across a range of CCT values based on a dim-stop limit.

Abstract: A display substrate and a display device are provided. The display substrate includes a base substrate, multiple sub-pixels, multiple data lines, a test circuit, multiple data leads, at least one test pad, and at least one first test signal line. The multiple data lines are electrically connected to the multiple sub-pixels, and configured to provide data signals to the multiple sub-pixels. The multiple data leads are electrically connected to the multiple data lines and the test circuit. At least one test pad is located on at least one side of the test circuit. The at least one first test signal line is electrically connected to at least one test pad and the test circuit, and includes at least two conductive layers connected in parallel and electrically connected to each other.

Abstract: A contact detection unit, after executing a first detection operation of contact between the wire electrode and the workpiece at a first relative movement speed and a first pulse cycle, executes a second detection operation of contact between the wire electrode and the workpiece, at a second relative movement speed which is slower than the first relative movement speed, and at a second pulse cycle which is longer than the first pulse cycle, and a movement speed control unit, after execution of the first detection operation, and prior to execution of the second detection operation, causes the wire electrode and the workpiece to relatively move in a distancing direction.

Abstract: A radiation emitting semiconductor chip may include a semiconductor layer sequence having an active region configured to generate electromagnetic radiation, a first dielectric mirror layer arranged above the semiconductor layer sequence, and a second dielectric mirror layer arranged above the first dielectric mirror layer. The first dielectric mirror layer may have at least one first recess. A first current spreading layer may be arranged in the first recess and above the first dielectric mirror layer. The second dielectric mirror layer may have at least one second recess extending up to the first current spreading layer. The first recess may not overlap with the second recess in lateral direction in plan view. Furthermore, a method for producing a radiation emitting semiconductor chip is disclosed.

Abstract: Apparatuses including output drivers and methods for providing output data signals are described. An example apparatus includes a high logic level driver, a low logic level driver, and an intermediate logic level driver. The high logic level driver is provided a first voltage and provides a high logic level voltage to a data terminal when activated. The low logic level driver is provided a second voltage and provides a low logic level voltage to the data terminal when activated. The intermediate logic level driver is provided a third voltage having a magnitude that is between the first and second voltages, and provides an intermediate logic level voltage to the data terminal when activated. Each of the high, low, and intermediate logic level drivers are configured to be respectively activated based on one or more of a plurality of control signals.

Abstract: In an embodiment an electronic load for installation in a power supply of a vehicle lamp includes a first connection node connected to two first connection sections adapted to be connected between respective corresponding connection sections of a first line carrying a voltage potential, a second connection node connected to two second connection sections adapted to be connected between respective corresponding connection sections of a second line carrying a reference potential, wherein a difference between the voltage potential and the reference potential comprises a supply voltage configured to be supplied to the vehicle lamp and a current sink circuit coupled between the first and second connection nodes, the current sink circuit configured to cause a substantially constant current flow independently of a time-varying supply voltage from at least one of the first connection sections to at least one of the second connection sections.

Abstract: A display device includes a display panel receiving an emission driving signal, and a panel driver driving the display panel in a mode in which the driving frequency is varied. The panel driver includes an emission driving circuit outputting the emission driving signal, a data driving circuit outputting a data signal, and a driving controller. The data driving circuit inverts a polarity of the data signal in units of at least one driving frame in response to a first option signal. The driving controller includes a counting circuit which counts an operation cycle of the emission driving circuit to output a count value, and a first option control circuit which compares the count value with a preset first threshold value and sets the first option signal to an active state or an inactive state according to a comparison result.

Abstract: Presented are systems and methods for controlling a compensation circuit. In embodiments, a detection circuit receives a set of control signals that have been generated by a control circuit to drive a set of light emitting diode (LED) switches. The switches control a set of LEDs driven by a DC-DC converter that is coupled to a feedback loop to which the compensation circuit is removably coupled. In embodiments, the detection circuit determines whether the status of an LED is about to change and, in response, uses the compensation circuit to control the feedback loop in a manner such as to reduce a current overshoot or current undershoot in the LED current.

Abstract: A method includes awaiting for a gateway period, at a lighting system element of a lighting control group, for zero or more gateway messages from a gateway over a wireless communication network; tracking, at the lighting system element, zero or more gateway messages from the gateway that are received; and, in response to the zero or more gateway messages received, requesting designation of a gateway repeater to communicate with the gateway. The method further includes awaiting for a controller period, at the lighting system element, for zero or more controller messages from a local lighting zone controller over the wireless communication network; tracking, at the lighting system element, the zero or more controller messages from the local lighting zone controller that are received; and, in response to the zero or more controller messages, requesting designation of a local lighting zone repeater to communicate with the local lighting zone controller.

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

Abstract: The invention relates to a method (100) for operating an isolated primary side switched converter (300) for providing a voltage supply to an LED load (401), wherein the converter comprises a galvanic isolation stage (301), the method comprising the steps of: detecting (101) a feedback signal at a primary side of the galvanic isolation stage (301), wherein the feedback signal corresponds to a secondary side voltage, determining (103) an LED supply voltage based on the feedback signal, calculating (105) a threshold value based on a constant reference voltage and an adjustment factor, wherein the adjustment factor is a dynamic factor whose absolute value increases with increasing LED current, and interrupting (107) the voltage supply to the LED load (401) if the determined LED supply voltage exceeds the threshold value.

Abstract: Systems, methods, and computer program products for providing and managing a lighting system. A lighting device of the system is configured to receive an activation signal from a user interface of the lighting device, an external communication device, or another lighting device. In response to receiving the activation signal, and if certain operational conditions are met, the lighting device may activate a light source and transmit another activation signal. Additional lighting devices receiving the activation signal from the first lighting device may also activate their light sources and retransmit the activation signal. Data carried by the activation signals and signals received from one or more sensors in each lighting device may be used by the lighting device to determine whether to activate its light source, and one or more characteristics of the light to be emitted.

Abstract: A luminaire and network for use in assisting persons in a building comprising: at least one lighting module, at least one communications component, a controller, an uninterruptible power supply in or coupled to the luminaire to power the lighting module, communications component and/or controller in the absence of a regular (e.g. AC) power supply, wherein the controller: triggers the lighting module to illuminate upon an activation event, facilitates communication via the communications and/or facilitates positioning of persons (or their devices) using the communications component and/or other components.

Abstract: A power supply that supplies power to a capacitive load comprises: a converter; an inverter; a resonant transformer; a detector configured to detect output frequency or output current and output voltage; and a controller configured to control the inverter, wherein the controller is configured to: calculate output power; adjust the output frequency within a predetermined frequency search range, adjust the output voltage within a predetermined voltage search range, and specify, as a frequency target value, a minimum value of the output frequency with which the output power reaches predetermined output power; and control the inverter so that the output frequency will be the frequency target value, adjust the output voltage within the predetermined voltage search range, and specify, as a voltage target value, a value of the output voltage with which the output power is target output power.

Abstract: A system (e.g., a power and communication system for remote components) can include a first wire, a second wire, and a first module operatively connected to the first and second wire. The first module can be configured to output power to and to communicate over the first wire and second wire. The system can include a second module operatively connected to the first module by the first wire and the second wire. The second module can be configured to receive power from the first module and to communicate with the first module over the first wire and/or second wire. The first module can be configured to modify a voltage on at least the first wire to signal to the second module to provide serial communication to the first module via the first wire and/or second wire.

Abstract: A load control system may include a load control device for providing power to an electrical load and a control device that may send instructions to the load control device for providing the power to the electrical load. The control device may communicate with the load control device using a link address assigned to the load control device. The load control device may provide power to the electrical load in a manner that causes the electrical load to indicate the link address assigned to the load control device. The link address may be identified by a user or a user device. The identified link address may be associated with a load control device identifier that may identify a physical location of a load control device that is assigned the link address. A user may control a load control device at a physical location by sending instructions via the link address.

Abstract: A discharge apparatus for an electrical drive arrangement of a vehicle, having an input interface, having an output interface, having a main switching device, wherein the main switching device is connected to the input interface, having a first discharge branch, wherein a first input of the first discharge branch is connected to the main switching device, having a second discharge branch, and having a control device, wherein the control device is designed to connect the first discharge branch in a first discharge state of the discharge apparatus and to connect the second discharge branch in a second discharge state.

Abstract: A power supply circuit, a driving chip and a display apparatus. The power supply circuit comprises: a reference current generation circuit (101), which is configured to generate a reference current; a driving circuit (302), which is connected to the reference current generation circuit (101) and is configured to generate, according to the reference current, a mirror image current with an adjustable mirror image proportion, and output a bias voltage and a gate driving voltage; and a channel current output circuit (303), which is connected to the driving circuit (302) and is configured to receive the bias voltage and the gate driving voltage, and generate, according to the mirror image current, a channel current with an adjustable mirror image proportion. Since a mirror image proportion is adjustable, the current precision can be improved, and when a relatively large output current is required, a mirror image current can remain relatively small, thereby reducing power consumption.

Abstract: A method of joining a lighting device (3?) to a network (2) and pairing the lighting device with a remote control device (7), the method comprising: transmitting a joining code to one or more lighting devices (3?) using an electromagnetic radiation signal (31); selecting a lighting device (3?) to be joined to a network (2) and paired with a remote control device (7) by directing a directional beam of electromagnetic radiation (30) onto a sensor (2) of a lighting device (3?); in response to receipt of the directional beam of electromagnetic radiation and of the joining code from the electromagnetic radiation signal, by the selected device, joining the selected device to the network if the received joining code is an access code for the network and pairing the joined device (3) with a remote control device (7) such that the joined device is controllable, on the network, by the remote control device (7).

Abstract: A linear lighting fixture may comprise lighting control devices for controlling lighting loads in a load control system. Each linear lighting fixture may include a fixture controller configured to control lighting control devices. The fixture controller may receive messages from one or more devices in the load control system for controlling lighting control devices in the linear lighting fixture. The fixture controller may receive the message and communicate with the lighting control devices on a wired power/communication link. Each linear lighting fixture may comprise one or more sensors. The sensors may be coupled to the fixture controller to send/receive messages on a wired power/communication link and/or a wireless communication link. The lighting control devices in the fixtures may be zoned separately or together. Each of the sensors in a linear lighting fixture may be zoned with one or more of the lighting control devices in the linear lighting fixture.

Abstract: Described implementations monitor potential voltage at a location to determine device usage at the location. The implementations utilize a plug-in energy sensor that is plugged directly into any electrical outlet at the location and measures deviation in voltage at the location. Once plugged into an electrical outlet, the plug-in energy sensor monitors one or more of the positive line and ground and/or the neutral line and ground for changes in potential voltage at the location. The plug-in energy sensor may also inject a load (resistive load, inductive load, capacitive load) into the electrical circuit at the location and then measure the signal or response to the injected load.

Abstract: A method and apparatus for estimating stress on capacitor is provided. A power converter may include an input terminal for receiving an input voltage, a power stage coupled to the input terminal, a capacitor coupled to the power stage, a controller configured to control the power stage to generate an output voltage at the capacitor as a function of the input voltage, and a stress monitor module. The stress monitor module is configured to determine a stress energy metric for the capacitor based on variations in the output voltage and identify a first fault condition based on the stress energy metric.

Abstract: In an example, a rectifier circuit includes first and second capacitors, first and second current control devices, and a switch. The first current control device is configured to provide an input current to the first capacitor during a positive cycle of an alternating current (AC) input voltage. The second capacitor is configured to store a charge and the switch is configured to couple the second capacitor to a ground terminal so the second capacitor discharges a capacitor current during the positive cycle of the input voltage responsive to the stored charge in the second capacitor. The second current control device is configured to provide the capacitor current to the first capacitor during the positive cycle of the input voltage. The first capacitor is configured to store a charge responsive to the input current and the capacitor current.

Abstract: A load, a transistor which controls a current value supplied to the load, a capacitor, a power supply line, and first to third switches are provided. After a threshold voltage of the transistor is held by the capacitor, a potential in accordance with a video signal is inputted and a voltage that is the sum of the threshold voltage and the potential is held. Accordingly, variation in current value caused by variation in threshold voltage of the transistor can be suppressed. Therefore, a desired current can be supplied to a load such as a light emitting element. In addition, a display device with a high duty ratio can be provided by changing a potential of the power supply line.

Abstract: A method of automatically programming a new load control device that replaces an old load control device takes advantage of a remote identification tag (e.g., an RFID tag) located in the vicinity of the old device. The remote identification tag stores an identifier that is representative of a location in which the old device is installed. The method includes the steps of: (1) storing a setting of an old device in a memory of a controller; (2) associating the setting with the identifier of the old device in the memory of the controller; (3) the new device retrieving the identifier from the remote identification tag after the new device is installed in the location of the old device; (4) the new device transmitting the identifier to the controller; and (5) the controller transmitting the setting of the old device to the new device in response to receiving the identifier.

Abstract: The device to estimate the lifetime consumption of one or more electrolytic capacitors comprises a temperature sensor which is thermally insulated from the ambient by being arranged either between two equal electrolytic capacitors connected in parallel with each other or on the case of an electrolytic capacitors and where it is covered with a layer of thermally insulating material. The device comprises further a controller which is suitable to estimate the lifetime consumption based on the measurement data of the temperature sensor.

Abstract: The present application discloses an LED lamp and a local IR dimming assembly integrated with the LED lamp. The LED lamp comprises a hollow lamp housing, an LED light source module and a driver module. The local IR dimming assembly comprises an IR emitter for emitting infrared signals, with a physical control mechanism for controlling the transmission of infrared signals; an IR receiver configured to be electrically connected with the driver module, and to receive and transmit an infrared signal from the IR emitter to the driver module; wherein the IR emitter and the IR receiver are both arranged in the LED lamp in the form of infrared communication; through the local manipulation of the physical control mechanism of the IR emitter, at least the optical output power of the LED lamp is locally adjusted and controlled.

Abstract: A method of commissioning a lighting device in a lighting system comprises receiving (121) a first message from a mobile device (41) on the lighting device (11,13). The first message indicates that the mobile device intends to scan, using the first wireless communication technology, for any lighting device which can be commissioned using the first wireless communication technology. The method further comprises determining (123) whether the lighting device can be commissioned using the first wireless communication technology and controlling (125) a light source to render a light effect upon receipt of the message in dependence on the determination whether the lighting device can be commissioned via the first wireless communication technology. The method also comprises receiving (127) a second message from the mobile device and responding by transmitting (129) a third message confirming that the mobile device can control the lighting device, using the first wireless communication technology.

Abstract: A programmable lighting system includes a plurality of color channels configured to generate light of different colors, and a light driver configured to drive the plurality of color channels according to a dimmer setting and a correlated color temperature (CCT) setting, and to maintain a constant maximum lumen output across a range of CCT values based on a dim-stop limit.

Abstract: A linear regulator supplies a first drive current to a first light source in a first period in which the first light source is turned on and a second light source is not turned on, and in a second period in which the first light source and the second light source are turned on, and stops the supply of the first drive current in a third period in which the first light source and the second light source are turned off. A switching regulator supplies a second drive current to the second light source in the second period, and stops the supply of the second drive current in the third period.

Abstract: A system is created for an efficient dimming LED lighting system, and comprising a voltage source, an electronic switch controlled by a pulse width modulation, PWM, driving signal and an LED lighting module connected in series. The LED comprises an LED group and a constant current drive circuit to drive a constant current through the LED group. The voltage source and a bypass branch, which is connected in parallel with the electronic switch, is adapted such that when the electronic switch is open, a power delivered to the constant current drive circuit is sufficient to maintain operation of the constant current drive circuit, ensuring capability for a deep dimming.

Abstract: An apparatus connectable to a streetlight luminaire includes a housing, an electrical connector, power conversion circuitry, and an output power interface. The housing has a top surface, a bottom surface, and at least one sidewall interconnecting the top and bottom surfaces. The electrical connector is integrated with the bottom surface of the housing and electromechanically connectable to a top-side electrical connector of the streetlight luminaire. The power conversion circuitry is operable to receive an input alternating current (AC) signal from the electrical connector and produce at least one output AC signal, wherein an average voltage of each output AC signal is less than an average voltage of the input AC signal. The output power interface is electrically coupled to the power conversion circuitry and integrated with the sidewall(s) of the housing. The output power interface is arranged to provide the output AC signal(s) for use external to the housing.

Abstract: The print head and light emitting elements, first and second drive circuits, and a control circuit. The light emitting elements and drive circuits are spaced from each other an arrangement pitch. The first drive circuit includes a first capacitor and sets a light emission level for the first light emitting element. The second drive circuit includes a second capacitor and sets a light emission level of the second light emitting element. The control circuit is connected to the first drive circuit by a first wiring and to the second drive circuit by a second wiring and controls voltages across the first and second capacitors individually. A difference between the length of the first wiring and the length of the second wiring is less than the arrangement pitch.

Abstract: A PWM controlled current source includes a selection input, a modulation input, a switchable current source which can be switched by means of a signal at a control terminal and whose current output is configured for connection to a load, and an inverter circuit including an input node and an output coupled to the control terminal. The inverter circuit has a capacitance conditioned by elements of the inverter circuit. A start signal can be supplied to the input node in dependence on a selection signal at the selection input, which controls the switchable current source via the inverter circuit. The PWM controlled current source also includes a voltage-to-current converter that generates a current derived from a modulation signal at the modulation input and supplies it to the input node. The supplied current disconnects the switchable current source after a time period predetermined by the conditioned capacitance.

Abstract: A display device can include an overcoat layer disposed on a substrate; a light emitting device disposed on the overcoat layer, the light emitting device having an anode layer, an organic light emitting layer and a cathode layer; a contact hole extending through the overcoat layer; and an auxiliary electrode disposed in the contact hole and being connected to a first driving power, in which the cathode layer includes an organic layer and a cathode electrode layer, the cathode layer extends across the auxiliary electrode, the auxiliary electrode includes a contact region disposed in the contact hole and having a concave portion or a convex portion, and a portion of the cathode electrode layer directly contacts the contact region of auxiliary electrode.

Abstract: A DC power supply may use an input supply surge protection circuit that may be robust against positive and negative power surges. DC power may be provided through a first unidirectional circuit component such as a diode or selectively controlled MOSFET coupled in parallel with a transient voltage suppressor or Zener diode. The first unidirectional circuit component may have a first voltage rating and the transient voltage suppressor or Zener diode may have a second voltage rating lower than the first voltage rating. This may allow current to flow backward over the transient voltage suppressor or Zener diode to protect the first unidirectional circuit component from exposure to voltage beyond the first voltage rating in a power surge.

Abstract: A controller (1) configured to control properties of light emitted from a light emitting device (4), the controller comprises a control device (2) and a processing unit (3). The control device (2) enables a user to select a color point of the light emitted from the light emitting device (4) in a color space of the light emitting device. The selection of the color point is done by the user providing a single input to the control device (2). The processing unit (3) being configured to change the color point of light emitted from the light emitting device based on the single input. The change of the color point is done along a meandering curve extending along the black body locus (BBL) in accordance with the received single input.

Abstract: The disclosed devices may include a driver circuit including a voltage boost circuit, a pulse modulation controller, and optionally a headroom processor. The voltage boost circuit may be configured to receive a device input voltage (such as a battery voltage) and generate a backlight drive voltage. The pulse modulation controller may be configured to provide a pulse modulation signal to the voltage boost circuit, and may include a digital circuit or an analog circuit. Example devices may include a backlight unit receiving the backlight voltage. The optional headroom processor may provide a headroom signal to the pulse modulation controller based on a headroom voltage determined from the backlight unit. Devices may further include a backlight unit including an arrangement of light-emissive elements, and may include display devices such as head-mounted devices. Various other methods, systems, and computer-readable media are also disclosed.

Abstract: Provided is a display device including: a substrate having a display area and a peripheral area outside the display area; a first transistor and a second transistor each located over the display area of the substrate and arranged at different levels on the substrate; and a plurality of wirings located over the peripheral area of the substrate, wherein the plurality of wirings include first wirings and second wirings, the first wirings and the second wirings being located at different levels on the substrate and are alternately arranged with each other.

Abstract: It is intended to provide an irradiation device that can achieve good starting performance even without encapsulating a starting performance promoting substance into the internal space of a luminous tube in a discharge lamp, and simultaneously, can distinguish whether the discharge lamp is a genuine product or not. An irradiation device (50) is composed of a discharge lamp (110) provided as a light source and an ultraviolet light source (200) irradiating ultraviolet light to the discharge lamp (110) to detect whether the discharge lamp (110) is a genuine product or not in activation of the discharge lamp (110).

Abstract: A light sensor having a voltage reversing mechanism is provided. A photoelectric component converts a first light signal into a first photocurrent. A capacitor is charged to a first voltage by the first photocurrent. A counter counts a first coarse count value according to the first voltage. The photoelectric component converts a second light signal into a second photocurrent. The capacitor is charged from a reversed first voltage to a second voltage by the second photocurrent. The counter counts a second coarse count value according to the second voltage. The counter counts a fine count value according to the second coarse count value. One of the first light signal and the second light signal is emitted by both of an ambient light source and a light-emitting component and then reflected by a tested object, and the other one of them is emitted by only the ambient light source.

Abstract: An image processing device that realizes local dimming control and push-up control of a display device using an artificial intelligence function is provided. The image processing device includes a trained neural network model that estimates a local dimming pattern representing light emitting states of light source units corresponding to a plurality of areas divided from a display area of an image display unit for a target display image, and a control unit that controls the light emitting states of the light source units on the basis of the local dimming pattern estimated by the trained neural network model for the target display image displayed on the image display unit.

Abstract: Timing adjustment for accurate zero-crossing determination includes obtaining time offset(s) representing amounts of time between (i) zero-crossings of an input signal waveform, representative of an input AC waveform, input to a zero-crossing detector circuit and (ii) corresponding transitions of an output signal from an output of the circuit to a microcontroller, and determining times of the zero-crossings of the input AC waveform, which includes determining times of the corresponding transitions as detected by the microcontroller and adjusting the determined times using the time offset(s) to produce the times of the zero-crossings of the input AC waveform. In another aspect, input AC frequency is determined by determining pulse width(s) of pulse(s) of the output signal, and adjusting a half-cycle time corresponding to the pulse width(s) using the time offset(s) to provide a duration of half-cycles of the input AC waveform and inform a frequency of the input AC waveform.

Abstract: Circuitry to control dimming of a load circuit may be connected between a 0-10 V dimmer that outputs a DC voltage control signal and the load circuit. The circuitry may include a microcontroller that may be programmed to generate a first pulse-width modulated (“PWM”) signal having a duty cycle based on the dimming level configured to be set on the dimmer. A voltage conversion circuit may supply the microcontroller with data relating to the set dimming level. The microcontroller may be programmed to synchronize the first PWM signal with the supplied AC power from the main circuit based on a second PWM signal from a voltage detection circuit, such as a zero crossing voltage detection circuit. The first PWM signal may be supplied from the microcontroller to an on/off switch to chop the AC power waveform at certain intervals and thereby dim the load.

Abstract: System and method for controlling one or more light emitting diodes. For example, the system includes: a power supply controller configured to receive a cathode voltage from a cathode of a diode, the diode including an anode configured to receive a rectified voltage generated by a rectifying bridge, the power supply controller being further configured to generate a first signal based at least in part on the cathode voltage; and a driver configured to receive the first signal and generate a second signal based at least in part on the first signal, the driver being further configured to output the second signal to a gate terminal of a transistor, the transistor including a source terminal coupled to the driver and a first resistor, the transistor further including a drain terminal coupled to the one or more light emitting diodes and an output capacitor connected to the cathode of the diode.

Abstract: An enhanced smart lighting system (ESLS) for use in buildings without neutral wire connections for wall switches. The ESLS entails both a no-neutral wire smart lighting switch (NNWSLS) and a physically separate load adapter. The NNWSLS includes a sensing, control, or communication system (SSCCS) such as integrated WiFi. The load adapter mitigates electrical fluctuations which may be induced in a power load (for example a lightbulb) by the smart lighting switch, particularly when the smart lighting switch is nominally powered off but still has some current flow. The load adapter is an intermediary between the power load and a conventional load receptacle. The load adapter has an integrated dummy load configured in parallel with the power load. The dummy load provides an electrical pathway for low levels of electricity which run through the light socket even when the NNWSLS is set to an “off” configuration.