Abstract: An LED light set includes a controller connected with an electric plug and a main light string of a plurality of main light bulbs in serial arrangement. Each of the main light bulbs is connected with an associate light string of a plurality of associate light bulbs. A main control IC is provided in the controller to control voltage and current supplied to the main light bulbs of the main light string. An associate control IC is provided within each of the main light bulbs to control voltage and current supplied to the associate light bulbs of the associate light string. The voltage and current supplied to the associate light strings are controlled to be lower than those supplied to the main light string so that conducting wires of each of the associate light string can be made thinner than conducting wires of the main light string.

Abstract: Multi-junction solid-state transducer (SST) devices and associated systems and methods are disclosed herein. In several embodiments, for example, an SST system can include a first multi-junction SST chain having a first drive voltage, a first P-contact, and a first N-contact, and a second multi-junction SST chain having a second drive voltage, a second P-contact, and a second N-contact. The first and second multi-junction SST chains can be configured to be activated independently of each other. The SST system can further include a driver operably coupled to the first and second P- and N-contacts. The driver can be configured to activate the first multi-junction SST chain when voltage input is at least equal to the first drive voltage. When absolute voltage increases a predetermined voltage level, the driver can be configured to activate the second multi-junction SST chain or the first and second multi-junction SST chains.

Abstract: A vehicle illumination apparatus is disclosed. The apparatus comprises a retractable step in connection with a panel of the vehicle. The retractable step comprises a tread portion. A light source is disposed proximate the panel and is configured to emit a first emission having a first wavelength. A first photoluminescent portion is disposed on the tread portion and is configured to emit a second emission having a second wavelength in response to receiving the first emission.

Abstract: Systems and methods for tuning a parameter associated with plasma impedance are described. One of the methods includes receiving information to determine a variable. The information is measured at a transmission line and is measured when the parameter has a first value. The transmission line is used to provide power to a plasma chamber. The method further includes determining whether the variable is at a local minima and providing the first value to tune the impedance matching circuit upon determining that the variable is at the local minima. The method includes changing the first value to a second value of the parameter upon determining that the variable is not at the local minima and determining whether the variable is at a local minima when the parameter has the second value.

Abstract: An LED power supply device includes a power supply to control an LED component, a control unit (with control interface) to control the power supply, and a voltage supply unit connected to a connection of the power supply. the control unit receives operating voltage from the voltage supply unit for continuous operation in an activated and non-activated control state of the LED component, and the voltage supply unit uses a capacitor coupled to an output side of the power supply to supply a capacitor voltage as operating voltage to the LED power supply device. The control unit is configured to charge the capacitor using pulse-like control of the power supply such that, in the non-activated control state, the maximum charging voltage lies below the LED threshold voltage.

Abstract: A light-emitting diode (LED) driver, an LED lighting apparatus, and a method of operating the LED lighting apparatus are provided. The LED driver may include an LED current controller configured to control an LED current, which flows through an LED array including a plurality of LEDs, such that the LED current is maintained at a constant level; a comparer configured to compare a sensing signal, which corresponds to a magnitude of the LED current, and a reference signal, and to obtain a first output signal based on a comparison result; and a dimming controller configured to modify the first output signal to obtain a second output signal for dimming of the plurality of LEDs, and to provide the second output signal to the LED current controller.

Abstract: A low power bypass circuit for use with a string of series-connected LEDs includes a semiconductor diode and resistor connected in series, which semiconductor diode and resistor combination become conductive upon the failure of an LED or upon the improper, reverse polarity connection of the string of series-connected LEDs to a power supply. When the semiconductor and resistor combination becomes conductive, a three-terminal gate-controlled semiconductor switching device becomes conductive, thereby bypassing the failed LED and protecting the integrity of the string of series-connected LEDs upon the improper reverse polarity connection of the string of series-connected LEDs to a power supply.

Abstract: A lighting system includes circuitry to provide wireless LED driver or fluorescent ballast control without requiring changes to existing wiring setups. A power stage includes a power converter coupled across a first set of power terminals. The first power terminals are coupled to a second set of terminals via the wiring. A load stage is coupled to the second power terminals, wherein power provided across the first set of terminals is received by the load stage and deliverable to lighting devices. The load stage further includes a dimming control signal receiver coupled across the second set of power terminals and configured to receive an encoded dimming control signal. The encoded signal is transmitted across the wiring setup, wherein the power stage further includes a dimming control signal decoder coupled across the first set of power terminals and effective to deliver a decoded dimming control signal to the controller.

Abstract: The present application discloses a light-emitting diode (LED) lighting system, including: a toroidal transformer comprising a pair of input terminals and a pair of output terminals; and an illuminant comprising an LED circuit; wherein the illuminant is electrically connected to the pair of output terminals of the toroidal transformer. The present application uses a toroidal transformer to simplify a circuit and reduce the number of electronic parts used. On one hand, a service life of a product can be prolonged, and on the other hand, costs can be reduced and a recycling rate is high, which is beneficial to environmental protection.

Abstract: A multi-lamp fluorescent light fixture includes a plurality of replaceable fluorescent lamp starter units. Each starter unit has a built-in microcontroller, an RF (Radio-Frequency) receiver, and communicates wirelessly with a master unit. Each starter unit can be wirelessly controlled to turn off coupled fluorescent lamps. Each starter unit receives a turn off command, monitors the AC voltage supplied to coupled lamps, and initiates turn off when the AC voltage reaches a threshold voltage stored in a memory of the microcontroller. In one novel aspect, each threshold voltage is selected such that turn off of lamps coupled to each starter is initiated within one millisecond. Systems of existing light fixtures are retrofitted with such wireless starter units, and thereby made controllable by a master unit so that the master unit can turn off the lights if room occupancy is not detected or if sufficient ambient light is available.

Abstract: The purpose of the present invention is to provide an LED drive circuit that is capable of ameliorating insufficient lighting and improving power utilization efficiency.

Abstract: Method and means for driving one or more LEDs. The method includes turning a power switch on to provide current through an inductor and the power switch, measuring voltseconds of the LEDs at a cycle time, comparing the measured voltseconds to a reference signal at an end of the cycle time, generating a signed discrete logical signal based on a difference between the measured voltseconds and the reference signal, and generating a control signal using the signed discrete logical signal to regulate a peak current through the power switch by keeping the cycle time voltseconds substantially constant. The reference signal may be proportional to a set average LED voltage.

Abstract: Disclosed is a method for adjustably controlling a light by concurrently tracking and controlling one or more lighting devices and apparatus thereof. The light device is connected to a control unit and is provided with at least one power switch. The control unit is provided for recognizing a switch operating code and for performing an adjustable controlling or an operating of each lighting device. Therefore, the present invention can provide more convenience and completeness of lighting configuration.

Abstract: An emergency lighting system with central batteries power remote LED fixtures and exit signs, with all components integrated throughout a single or multiple buildings. Status reports are available on demand and the system will generate written records required by the Life Safety Code. A wide range of fixtures optimized for emergency lighting are available for interior and exterior applications and all can be monitored via internet, with report displays available on any digital device. Easy access to batteries, automated testing, high lumen outputs, efficient optics and long lamp life ensure the lowest possible life cycle costs.

Abstract: A driving device is provided with: a power circuit in which it is possible to modify an output current value of an output terminal configured to have a load connected thereto; an output capacitor connected between the output terminal of the power circuit and a reference potential node; a switching element connected between the output terminal of the power circuit and the reference potential node; and a control unit that controls the output current value of the power circuit. The control unit turns the switching element ON and OFF and controls the output current value of the power circuit during a period in which the switching element is ON such that the voltage of the output terminal of the power circuit during this period is equal to or lower than the voltage applied to the load during a period when this load is OFF.

Abstract: A converter device including a voltage converter and means for supplying different currents and/or voltages for at least two different loads, e.g. LEDs or LED groups, wherein the voltage converter provided is a primary converter with resonant circuit, which outputs a variable voltage at an output, said voltage encompassing voltages of from <0V to at least the highest voltage required in the converter device for current outputting, and wherein the means for supplying different currents and/or voltages are formed by at least two secondary converters having output storage units and switching means for the controlled connection of their output storage units to the output of the primary converter.

Abstract: The present disclosure is directed to a light emitting diode (LED) lighting system. In one embodiment, the LED lighting system includes an LED light source deployed in a first location and a power supply for powering the LED light source, wherein the power supply is remotely located from the LED light source in a second location and designed to power the LED light source to minimize a power loss along a length of an electrical connection coupled between the LED light source and the power supply.

Abstract: In various embodiments, a control system for an electronic circuit iteratively applies voltage to and senses current from a load to regulate operation of the load.

Abstract: An LED driving device includes a first converter, a second converter, and a control circuit. The first converter generates a first voltage from received alternating current (AC) power. The second converter receives the first voltage and drives a plurality of LEDs based on the received first voltage. The control circuit sets a reference voltage level based on a level of the first voltage generated by the first converter, and controls the level of the first voltage by comparing a level of the AC power and a level of the reference voltage.

Abstract: Circuits and methods used therein provide an adjustable average current through a load in accordance with a pulse width modulated (PWM) signal. A condition detection circuit is configured to identify a condition of the electronic circuit and to generate a condition signal indicative of the condition. A current extension circuit is coupled receive the condition signal and coupled to receive the PWM signal. The current extension circuit is configured to generate, at the output node of the current extension circuit, an extended PWM signal having a first state and a second state. The first state of the extended PWM signal longer in time than a first state of the PWM signal by an amount related to a value or a state of the condition signal. Current pulses through the load are extended to be longer in accordance with the extended PWM signal.