Abstract: The present invention relates to a method (200), and a corresponding control unit (160), for grouping lighting devices in a system (100) including a plurality of lighting devices (120a-c) and a plurality of presence sensors (130a-c), at least one of the presence sensors being associated with at least one of the lighting devices. The method comprises: receiving (230) input indicating a user interaction element (170a); receiving (240) information from at least one presence sensor, the information indicating whether at least one lighting device associated with the at least one presence sensor is to be part of a group of lighting devices; and associating (280) the group of lighting devices with the indicated user interaction element, which is thereby configured to control the group of lighting devices.

Abstract: The present disclosure discloses a method for controlling a standing wave accelerator and a system thereof. The method comprises: generating, by an electron gun, an electron beam; injecting the electron beam into an accelerating tube; and controlling a microwave power source to generate and input microwave with different frequencies into the accelerating tube, so that the accelerating tube switches between different resonant modes at a predetermined frequency to generate electron beams with corresponding energy. According to the above solution, it only needs to change the output frequency of the microwave power source in the process of adjusting energy, without making any change to the accelerating structure per se. Therefore, the method is easy to operate. In addition, the structure of the accelerating tube in the above system is simple, without adding a particular regulation apparatus.

Abstract: A backlight driving circuit is disclosed. The backlight driving circuit includes a steady voltage circuit, a boost converter, a current setting circuit, and a control circuit. The steady voltage circuit receives an input voltage, filters the input voltage and outputs a steady DC voltage. The boost converter connects to the steady voltage circuit to receive the steady DC voltage. The control circuit provides a first PWM square wave such that the boost converter may supply power to the LED light bar. Wherein the boost converter includes a first MOSFET or a triode. At least three parallel connected resistors are arranged between a source of the first MOSFET or a collector of the triode and the ground, and the three resistors have the same or similar resistance. In addition, a liquid crystal display includes the backlight driving circuit is also disclosed.

Abstract: An illumination device and methods are provided herein for avoiding over-current and over-power conditions in one or more power converters included within the illumination device. The illumination device may include at least a plurality of light emitting diode (LED) chains, a driver circuit, at least one power converter, and a control circuit. In some embodiments, the control circuit may be generally configured for determining a maximum safe current level and/or a maximum safe power level attributed to the power converter(s) at a present operating temperature, and for adjusting respective drive currents supplied to the plurality of LED chains by the driver circuit, so as not to exceed the maximum safe current level or the maximum safe power level at the present operating temperature. In some embodiments, a temperature sensor may be included within the illumination device for measuring the operating temperature presently associated with the power converter(s).

Abstract: Dynamic light emitting device (LED) lighting adjustment systems and related methods are disclosed. In one aspect, a method can receive, at an LED lighting fixture, a lighting adjustment signal corresponding to a target lighting level and determine a delta value that represents a difference between a current lighting level of the LED lighting fixture and the target lighting level and a step time value associated with the determined delta value. The method can further include adjusting the current lighting level of the LED lighting fixture to a new current lighting level for the duration of the step time value and repeating the determining and adjusting steps until the new current lighting level equals the target lighting level.

Abstract: A device and a method for controlling the electrical power supply of a plurality of light sources, preferably of light-emitting diodes, or LEDs. The plurality of light sources is divided into at least two groups of light sources. The invention is noteworthy in that it allows the use of a multiphase step-up voltage converter for all the groups of light sources, whereas the measurements of the input currents for each of the phases of the converter give a reliable indication of the level of power required by one of the groups being powered.

Abstract: A light emitting device includes a light source unit, a connection controller, and a driving controller. The light source unit includes a first LED array including a plurality of first LEDs connected in series and a second LED array including a plurality of second LEDs connected in series. The connection controller selectively sets a connection structure between the first and second LED arrays as a series connection, a parallel connection, or a series-parallel connection based on a peak value of a driving voltage driving the light source unit. The driving controller controls the number of LEDs driven in the light source unit according to a magnitude of the driving voltage. Each of the first and second LED arrays is connected between a plurality of first nodes and a plurality of second nodes.

Abstract: An electronic dimming ballast or light emitting diode (LED) driver for driving a gas discharge lamp or LED lamp may be operable to control the lamp to avoid flickering and flashing of the lamp during low temperature or low mercury conditions. Such a ballast or driver may include a control circuit that is operable to adjust the intensity of the lamp. Adjusting the intensity of the lamp may include decreasing the intensity of the lamp. The control circuit may be operable to stop adjustment of the intensity of the lamp if a magnitude of the lamp voltage across the lamp is greater than an upper threshold, and subsequently begin to adjust the intensity of the lamp when the lamp voltage across the lamp is less than a lower threshold. Subsequently beginning to adjust the intensity of the lamp may include subsequently decreasing the intensity of the lamp.

Abstract: A multi-stage LED dimming module includes a voltage source and an LED control module having a dual-link pull switch, a substrate, a control circuit and a multiple of LED light sources, and the control circuit further includes a rectifier/filter circuit unit, a resistor array unit and a control circuit unit, and the voltage source is electrically connected to the LED control module for controlling the brightness of the LED control module, so as to achieve the effects of providing a convenient application and a stable structure.

Abstract: A system and method for a lighting control system to control street lighting fixtures using modified geometric harmonic modulation for communications over a powerline. At least some of the lighting fixtures have another communications capability that enables RF communications. The communications may by messages be sent to the lighting fixtures to read RF enabled meters.

Abstract: A power factor correction circuit (11) comprises an input for receiving an input voltage (UIN), an inductance (21) coupled to the input, a switching means (24) that is coupled to the inductance (21) and that is controllable in order to either charge or discharge the inductance (21), and a control device (14). The control device (14) is set up in order to produce a control signal (Ctrl) for controlling the switching means (24) on the basis of a parameter value. The control device (14) is set up in order to ascertain the parameter value on the basis of an arithmetic sign of a time derivation for the input voltage (UIN).

Abstract: The invention relates to a method for activating at least one LED, which is supplied with a direct current voltage or a rectified alternating current voltage and which by means of a coil (L1) and a first switch (S1) clocked by a control/regulating unit (SR) provides a supply voltage for at least one LED, wherein when the first switch (S1) is switched on the coil (L1) temporarily stores energy that discharges via a diode (D1) and at least one LED when the first switch (S1) is switched off and wherein the control unit (SR) activates the first switch (S1) by means of a dimming signal. Said method is characterized in that the dimming signal is generated by externally combining a low-frequency signal and a high-frequency signal, wherein the pulse width (TON*LF) of the low-frequency signal is selected as an integral multiple of the cycle duration of the high-frequency signal.

Abstract: A light emitting diode dimmer circuit uses a typically commercially available TRIAC dimmer to modulate an illumination-purpose light emitting diode circuit, and to make up the shortfall of the AC voltage phase, caused by the conductivity phase angle of the TRIAC dimmer, for the energy storage applying the energy storage and rectifier circuit, so that the light output of the light emitting diode can achieve the stable and flicker-free effect in the dimming requirement of the light emitting diode either the micro bright or full bright requirement.

Abstract: A flashlight has a lock out feature that prevents it from being turned on which is activated or deactivated by pointing the flashlight in a first direction (e.g., upward) prior to turning it on, depressing a switch to turn it on, tilting the flashlight in a second direction (e.g., downward) while continuously depressing the switch, and releasing the switch.

Abstract: A solid-state lighting system includes a light-emitting device (LED) driver, an LED or plurality of LEDs, a transistor connected in series with the LED or plurality of LEDs, and a current source connected in parallel with the transistor. The LED driver generates a drive signal, which controls the transistor and current flowing through the LED or plurality of LEDs and the transistor. The drive signal is generated in response to a dim control signal, which determines the dim setting of the LED or plurality of LEDs. The current source serves to maintain at least a minimum current through the LED or plurality of LEDs at all times, even when the transistor is turned OFF or is in a high resistance state, thereby preventing large supply voltages from dropping across the transistor and protecting the transistor from undesirably breaking down or being damaged or destroyed.

Abstract: An ignition coil includes a first winding, a second winding, and a third winding. A first switch is electronically connected to a first end of the first winding. A battery is electronically connected to a second end of the first winding. A booster with a first end electronically connected to the battery and a second end electronically connected to a first end of the third winding. A second switch is electronically connected to a second end of the third winding. A drive device is electrically connected to the first and the second switches, that turns the first and the second switch on and off. The drive device feeds a secondary current to the second winding by changing the first switch from an on-state to an off-state, and supplies an output from the booster to the third winding by changing the second switch from an off-state to an on-state.

Abstract: A lighting system includes an external sensor that is configured to measure a characteristic value of light received from the lighting system in a location of an environment that is illuminated by the lighting system, and a lighting device. The lighting device includes a plurality of LEDs that include a first group of LEDs that exhibit a first color temperature and a second group of LEDs that exhibit a second color temperature, a housing, and a device controller containing control circuitry that is configured to receive data from the external sensor and automatically alter a characteristic of light emitted by one or more of the LEDs in response to the received data. The housing may include an opening that receives and secures the plurality of LEDs, a body portion that provides a heat sink for the plurality of LEDs, and a power supply.

Abstract: An LED-based light includes one or more LEDs, a sensor arranged to detect a brightness level in an area resulting from the combination of light emitted by the LEDs with light from at least one ambient light source other than the LEDs, and operable to output a signal corresponding to the detected brightness level, a controller operable to regulate an amount of power provided to the LEDs in response to the signal, a light transmitting housing for the LEDs, the sensor and the controller and a connector shaped for connection with a light socket disposed at an end of the housing.

Abstract: The present invention addresses the issue of improving generation efficiency of plasma in relation to usage power in a plasma generation apparatus. The present invention is directed to a plasma generation apparatus provided with an electromagnetic wave emission antenna and a discharge electrode. The plasma generation apparatus includes a plasma control device that controls generation of plasma, and is characterized that the plasma control device causes the electromagnetic wave emission antenna to intermittently emit electromagnetic waves by way of a drive sequence control. Especially, the plasma control device may preferably control an oscillating frequency, a power, output timing, a pulse width, a pulse cycle, and a duty cycle of the electromagnetic waves.

Abstract: A string set of series-connected incandescent bulbs in which the bulbs are individually provided with a voltage responsive shunt which is inoperative during normal operation of the string set when connected to a source of operating potential and which becomes operative only in response to an increase in the voltage thereacross which exceeds its rating, and in which the remaining bulbs of the circuit continue to receive rated current therethrough and rated voltage thereacross and further continue to be illuminated even though other bulbs in the string are either inoperative or are missing from their respective sockets. The string includes a split bridge AC to DC converter which provides pulsating DC current to the shunted, series-connected incandescent bulbs.