A bidirectional switch switched to conduct and interrupt a bidirectional current between a pair of input terminals. An input device receives a dimming level representing a value of light output of the load. A controller controls the bidirectional switch according to the dimming level. The controller controls the bidirectional switch to keep the bidirectional switch in an off-state from a start point of a half cycle of the AC voltage of the AC power supply to a first time point when a first time period therefrom elapses, and to turn the bidirectional switch to an on-state at the first time point. The controller turns the bidirectional switch to the off-state at a second time point when a second time period elapses from the first time point. The controller keeps the bidirectional switch in the off-state from the second time point to an end point of the half cycle.

A focus pluggable interface control device includes a sensor, a lens covered on the periphery of the sensor and a mounting plug electrically connected to external lamps. Optical signals passing through the lens to be focused is transmitted to the sensor. The lens is configured to collect control information of light types transmitted to the sensor in order to increase sensitivity of the sensor to receive the control information and response speed of the control information, and also expand sensing range of the sensor so as to improve user's experience. The sensor is electrically connected to the external lamp via the mounting plug so that the focus pluggable interface control device can be conveniently replaced, disassembled or installed without needing additional wires, thereby the cost of replacing the control device can be reduced.

A focus pluggable interface control device includes a sensor, a lens covered on the periphery of the sensor and a mounting plug electrically connected to external lamps. Optical signals passing through the lens to be focused is transmitted to the sensor. The lens is configured to collect control information of light types transmitted to the sensor in order to increase sensitivity of the sensor to receive the control information and response speed of the control information, and also expand sensing range of the sensor so as to improve user's experience. The sensor is electrically connected to the external lamp via the mounting plug so that the focus pluggable interface control device can be conveniently replaced, disassembled or installed without needing additional wires, thereby the cost of replacing the control device can be reduced.

Methods, devices, and systems for a current converter circuit for airfield ground lighting are described herein. In some examples, one or more embodiments include a bi-directional switch, an inductor to store energy in response to the bi-directional switch being on, and an output capacitor to discharge power to an LED, where the bi-directional switch can switch off to cause the inductor to discharge to the output capacitor in response to a voltage across the output capacitor being less than a threshold voltage.

A power-control device comprises an energy-import portion and an energy-export portion. The power-control device may additionally include a general processing and power supply circuit providing linear control of the power-control device's production of power to the load. The energy-import portion is coupled between a V.sub.LINE terminal and a load terminal, and is capable of importing energy to the load terminal during a first portion and a third portion of an alternating voltage V.sub.AC waveform. The energy-export portion is coupled between the load terminal and a NEU terminal, and is capable of exporting energy from the load terminal during a second portion and a fourth portion of the alternating voltage V.sub.AC waveform. The first, second, third and fourth portions of the alternating voltage V.sub.AC waveform are equal to a period of the alternating voltage V.sub.AC waveform and respectively are consecutive during the period of the alternating voltage V.sub.AC waveform. The power-control device provides variable power control to the load terminal in response to a variable on/off time of a PWM control signal.

A controller for controlling a light source module including a first LED array and a second LED array includes a power input terminal, a first power output terminal and a second power output terminal. The power input terminal is operable for receiving electric power from a power converter. The first power terminal is coupled to the first LED array, and the second power output terminal is coupled to the second LED array. The controller is operable for delivering the electric power to the first LED array via the first power output terminal in a first sequence of discrete time slots, and for delivering the electric power to the second LED array via the second power output terminal in a second sequence of discrete time slots. The first sequence of discrete time slots and the second sequence of discrete time slots are mutually exclusive.

A load control device for controlling power delivered from an alternating-current power source to an electrical load may comprise a controllably conductive device, a control circuit, and an overcurrent protection circuit that is configured to be disabled when the controllably conductive device is non-conductive. The control circuit may be configured to control the controllably conductive device to be non-conductive at the beginning of each half-cycle of the AC power source and to render the controllably conductive device conductive at a firing time during each half-cycle (e.g., using a forward phase-control dimming technique). The overcurrent protection circuit may be configured to render the controllably conductive device non-conductive in the event of an overcurrent condition in the controllably conductive device. The overcurrent protection circuit may be disabled when the controllably conductive device is non-conductive and enabled after the firing time when the controllably conductive device is rendered conductive during each half-cycle.

A method that includes the following steps: determination of predictive meteorological data in a region surrounding the facility; querying of a database about the presence of birds in the region surrounding the facility; calculation, by a prediction unit, of the probability of birds passing opposite the facility as a function of time, on the basis of the predictive meteorological data and data relating to the presence of birds in the region surrounding the facility; and control, by a control unit, of at least one light source of the facility, on a basis of the probability of passage, calculated by the prediction unit.

Various embodiments may include a dimmer system for controlling the power consumption of a load that can be connected with parallel-connected galvanically isolated dimming channels. The dimmer system may include a plurality of dimming channels, each dimming channel including a sensor for monitoring a temperature of associated switch elements; and a control unit for each dimming channel, the control units configured to shift a respective dimming edge based at least in part on the temperature to distribute power dissipation of the connected load substantially equally across the plurality of dimming channels.

This disclosure describes, in part, voice-controlled light dimmers that act as voice-controlled endpoints at which users may provide voice commands. These light dimmers include a front panel module coupled to a power module using a hardware interface. The front panel module may receive input from a user indicating commands for controlling appliances, and send communications to the power module using the hardware interface to control the appliances. In some examples, the communications involve encrypted data sent using an inter-integrated circuit (I2C) protocol using the hardware interface to an electrically isolated power module. The power provided to the appliances may be controlled by the power module of the voice-controlled light dimmer.