Abstract: An LED driver circuit is disclosed. The LED driver circuit includes an amplifier having a first input coupled to receive a reference voltage and a second input coupled to receive a feedback voltage. The circuit further includes first and second transistors each having respective gate terminals coupled to an output of the first amplifier. In a first mode, a first switch alternately couples a source terminal of the first transistor to the second input of the amplifier (when the pulse is asserted) and a source terminal of the second transistor to the second input (when the pulse is de-asserted). A third transistor includes a gate terminal that is coupled to ground, by a second switch, when operating in the first mode. When operating in the second mode, the switch couples the third transistor to the output of the amplifier, while the pulse remains asserted.

Abstract: A visibility evaluation unit of a light intensity adjustment apparatus calculates, for a detected object ahead of a moving body detected by a non-visible light sensor such as a laser range sensor, a visibility evaluation value resulting from evaluation of visibility, based on image data obtained by a visible light sensor such as a camera. A light intensity adjustment unit of the light intensity adjustment apparatus adjusts the light intensity of headlights for illuminating an area in which the detected object is present in accordance with the calculated visibility evaluation value.

Abstract: An autonomous vehicle is disclosed. The vehicle comprises a chassis, two or more drive wheels extending below the chassis, a drive motor housed within the chassis for driving the drive wheels, and a payload surface on top of the chassis for carrying a payload. An illumination system, for emitting light from at least one portion of the chassis, is mounted substantially around the entire perimeter of the chassis. The illumination system may be implemented using an array of light-emitting diodes (“LEDs”) that are arranged as segments. For example, there may be “headlight” segments on the front left and front right corners of the chassis.

Abstract: A busway system, including an electrical busway section having a length, the electrical busway section having first and second opposing sides, the electrical busway section including one or more busbars between the first and second sides and extending along the length of the electrical busway section; a plugin module including a plug head, the plug head being received within the one or more busbars to couple the plugin module with the electrical busway section; a driver module coupled to the plugin module; and a light source coupled to the electrical busway section and extending along the length of the electrical busway section, and further being electrically regulated by the driver module.

Abstract: A method for configuring a lighting system including one or more sensors for controlling one or more lighting units for providing illumination of an area. The method allows a target area to be determined for a particular sensing function, and then determines suitable sensor locations based on a mapping derived from an image of the area in question. The target area can be determined based on recognition of relevant objects such as doors and window for example. The sensor location or locations may be selected from existing sensor locations which may be integrated with a luminaire, or new sensor locations may be proposed.

Abstract: Bussing systems for bussing strips of LEDs that do not require insulation between adjacent copper solder pads, that enable cutting of each of the LED strips without loss of functionality for the cut strips(s), and that permit a power input lead to be soldered onto each strip without incident.

Abstract: A lighting control device configured to control a radiation state of light from a headlamp for a vehicle includes a vehicle model information acquisition section configured to acquire vehicle model information of a vehicle located in front in front of a host vehicle, a distance detection section configured to detect a distance between the vehicle located in front and the host vehicle, and a light distribution controller configured to control a light distribution with respect to a side in front of the host vehicle by the headlamp for a vehicle on the basis of the vehicle model information and the distance.

Abstract: A method of automatically regulating a bleeder current and an LED SCR dimming circuit are provided. According to the method, the SCR module can be controlled to be turned on reliably by detecting a leakage current when the SCR module is turned off and performing control for the bleeder current based on the size of the leakage current and correspondingly setting the size of the bleeder current, thereby greatly reducing power source loss and improving power source efficiency.

Abstract: A lamp system, and a method of operating the lamp system, are provided. The lamp system includes a gas discharge lamp, an electronic ballast and a control unit. A performance influencing control variable of the lamp system is used. The method allows operation with a high emission performance independent of the design thereof and of any potential changes caused by lamp aging and without any knowledge of the optimal operating temperature. According to the invention a light intensity control is provided, in which an actual value of a light intensity emitted by the gas discharge lamp is measured using a light sensor and the emitted light intensity is used as an actuating variable.

Abstract: A particle beam emitter has a hollow particle beam tube having a first end portion, a second end portion, and a longitudinal axis. An electromagnetic system that includes a voltage supply is electrically coupled to the hollow particle beam tube and is configured to generate a primary electrical current flowing axially in the hollow particle beam tube from the first end portion towards the second end portion. A primary magnetic field associated with the primary electrical current is operable to induce a secondary electrical current in a plasma located within the hollow particle beam tube, the secondary electrical current flowing generally axially within the plasma and causing the plasma to contract inwardly towards the longitudinal axis.

Abstract: A voltage transducer for a lighting system can include an input operable to receive an alternating current input power. The voltage transducer can include a current sink circuit operable to provide a current sinking output. The voltage transducer can include one or more control devices configured to determine a magnitude associated with the alternating current input power. The one or more control devices can be further configured to control the current sink circuit to adjust the current sinking output based, at least in part, on the magnitude of the alternating current input power.

Abstract: A short protecting circuit for a LED (Light-emitting Diode) driver for powering a plurality of LED strings, having: a short comparing circuit, configured to provide a plurality of short fault indicating signals; a first logic circuit, configured to provide a short fault signal based on the plurality of short fault indicating signals to indicate a short fault condition; a timing circuit, configured to provide a short protecting enable signal; and a second logic circuit, configured to provide a plurality of short isolating signals; wherein the short isolating signals are blocked when an open fault signal is valid.

Abstract: A vehicle headlight control device is provided with: a pedestrian detection unit which detects a pedestrian; and a headlight control unit which controls an irradiation state of a headlight. When the pedestrian detection unit detects a pedestrian within an irradiation range of the headlight, the headlight control unit executes dimming control for controlling the irradiation state of the headlight so that a periphery of the pedestrian is dimmed. The pedestrian is irradiated with a part of a high beam or a low beam, or marking light emitted from a dedicated light source. A dimming region is formed around the pedestrian by the dimming control, and contrast in brightness between the pedestrian and his/her surroundings can be raised.

Abstract: The present disclosure provides an electronic ballast-based device for controlling an electronic control circuit and a lighting lamp. The device includes an electronic ballast and an electronic control circuit which are connected with each other, the electronic control circuit including a filament analog circuit, a rectifier bridge circuit, at least two frequency detection circuits connected in parallel, an interface logic circuit and a switching circuit; the electronic ballast is connected with the switch circuit sequentially through the filament analog circuit and the rectifier bridge circuit; the at least two frequency detection circuits connected in parallel have one end connected between the filament analog circuit and the rectifier bridge circuit, or connected between the electronic ballast and the filament analog circuit, and another end connected with the interface logic circuit; and the interface logic circuit is connected with the switching circuit.

Abstract: A parallel circuit for light emitting diodes includes a first power wire, a second power wire, a first light emitting diode, a second light emitting diode, and a second impedance element. The first LED includes a first turn-on voltage, and two ends of the first LED are respectively connected to the first power wire and the second power wire. The second LED includes a second turn-on voltage, and the first turn-on voltage is different from the second turn-on voltage. The second impedance element and the second LED are connected to form a second series circuit. One end of the second series circuit is electrically connected to the first power wire, while the other end of the second series circuit is electrically connected to the second power wire. In the parallel circuit, different LEDs are respectively driven by different voltages to emit light with pre-determined brightness.

Abstract: This disclosure includes systems, methods, and techniques for controlling delivery of power to one or more strings of light-emitting diodes (LEDs). For example, a circuit includes a power converter unit configured to receive an input signal from a power source and generate a first output signal comprising a first voltage, a charge pump configured to receive at least a portion of the first output signal from the power converter unit and generate a second output signal comprising a second voltage, and a linear regulator configured to receive the second output signal from the charge pump and generate a third output signal comprising a third voltage.

Abstract: Light output from an LED light source is increased or reduced in response to adjustment of a triac-based dimmer having a triac holding current to maintain conduction of the dimmer. An LED controller to control the light output includes a voltage-controlled impedance to provide an adaptive holding current that causes a triac current of the dimmer to be greater than the triac holding current, particularly when the dimmer is adjusted for significantly low light output (e.g., less than 5%, 2%, or 1% of full power light output). The adaptive holding current also allows for smooth increase of the light output starting from low light output, without perceivable flicker or shimmer. In one example, the voltage-controlled impedance is a resistive-like impedance that is placed on a secondary side of a transformer providing power to the LED light source. In another example, the voltage-controlled impedance is not pulse width modulated.

Abstract: A control device for a vehicle headlight includes a motion information acquisition part that acquires information of a motion of at least a part of a driver in the vehicle, an attribute decision part that determines attribute of the driver based on the information acquired by the motion information acquisition part, and a light distribution controller that controls a light distribution of the vehicle headlight based on the attribute determined by the attribute decision part.

Abstract: A chained flashlight system includes: plural flashlights; plural lighting control devices that control lighting of the plural flashlights, respectively; a communication wire; and a traffic control device. The plural lighting control devices include receiving units, controlling units, activating units, and power supply units, respectively and are coupled to the traffic control device by the same communication wire. The traffic control device simultaneously sends an activating signal to the plural lighting control devices via the communication wire. The receiving units receive the activating signal. The controlling units activate the activating units on the basis of the time condition from the reception of the activating signal to the activation of the activating units, set for the flashlights, respectively. When the power supply units are turned ON in an activated state of the activating units, respectively, the flashlights are lit by a lighting signal from the traffic control device, respectively.

Abstract: A recommendation engine for a lighting system comprises a recommendation component for generating recommendation messages to recommend lighting effects for the lighting system; at least one data input for receiving, from a data source, data pertaining to a user of the lighting system; and a receptiveness component configured to use the received data to compute a current receptiveness level for the user indicating a current receptiveness of the user to receiving recommendations; wherein the recommendation component is configured to selectively cause recommendation messages to be outputted to the user via a user interface, to recommend lighting effects for the lighting system, in dependence on the current receptiveness level.