Devices, methods, and systems for alternating current circuits for airfield lighting are described herein. One system includes a circuit comprising an isolation transformer, a protection hardware circuit coupled to the isolation transformer, wherein the protection hardware prevents a voltage between an electrical contact of the circuit and a ground contact from meeting or exceeding a threshold voltage, and a load coupled to the protection hardware circuit to receive electrical energy from the isolation transformer.

The described embodiments relate to systems, methods, and apparatuses for estimating luminaire lifetimes using extrapolated sensor data. During a lifetime of a luminaire (108), a sensor (206) of the luminaire can become inoperable well before the entire luminaire becomes inoperable. In order to estimate when the luminaire will become inoperable, sensor data (504) should be continually tracked even after the sensor fails. In order to continue obtaining sensor data after the sensor fails, the sensor data can be extrapolated based on a correlation between previously received sensor data and other environmental data. The extrapolated sensor data can be tracked after the sensor becomes inoperable so that estimates of luminaire lifetime can be more accurate, compared to not having any sensor data. In this way, maintenance of luminaires can be scheduled according to predictions of luminaire lifetimes, rather than the occurrence of a luminaire failure.

Method for the operation and the expansion of a network of lights, each light in the network including a control module which is assigned to a group, each control module being in communication with a group controller as well as control modules in the same group. The network can be expanded by installing (19) new lights with their associated control modules, and each new control module scans (20) its environment and transmits environmental information to a central server where the environmental information is analysed and the new control modules are allocated (21) into groups. After allocation to a group in which control modules may be moved from one group to another or a new group is formed, the new control modules are available for normal operation. This process is repeated for each new light and associated control module.

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.

Devices, methods, and systems for alternating current circuits for airfield lighting are described herein. One system includes a circuit comprising an isolation transformer, a protection hardware circuit coupled to the isolation transformer, wherein the protection hardware prevents a voltage between an electrical contact of the circuit and a ground contact from meeting or exceeding a threshold voltage, and a load coupled to the protection hardware circuit to receive electrical energy from the isolation transformer.

The subject disclosure relates to an emergency lighting system for simulating power failure in an emergency lighting system. In some aspects, the system includes an interrupt relay coupled between a first power supply and a lighting array, a power monitoring module coupled between a second power supply and the lighting array, and a wireless transceiver configured for transacting data with a wireless backhaul gateway. Additionally, the lighting system can include a microcontroller configured to perform operations for receiving an interrupt command from the wireless backhaul gateway, toggling the interrupt relay in response to the interrupt command, wherein toggling the interrupt relay terminates power delivery to the lighting array, and measuring one or more power characteristics of the second power supply to determine if the second power supply can power the lighting array. Methods and machine-readable media are also provided.

A luminaire includes a microcontroller and program logic that calculates the operational age of a light engine that includes a plurality of light emitting diodes connected in series. The program logic uses changes in transition voltage to calculate the operational age of a light engine. Changes in forward voltage across the light engine are used to detect sudden catastrophic failure of individual light emitting diodes. In response to the sudden catastrophic failure of one of the light emitting diodes, the program logic adjusts the power provided to the light engine based on the calculated operational age of the light engine. For example, the operational age of the light engine may be compared with a warrantied lifespan, and the power may be adjusted to increase the likelihood of compliance with the warranty.

A lighting system waveform shaping circuit (WSC) includes a line voltage input, a line voltage output connectable to an input voltage port of a control unit, a neutral line input connectable to a neutral line of a voltage power source, and the WSC including an impedance matching network (IMN) configured to alter an input impedance of the lighting control circuit. In one embodiment, the IMN can include a resistor in series with the line voltage input, and an actively-controlled bypass switch in parallel with the resistor. In another embodiment, the IMN can include respective ferrite chokes surrounding the input and the output voltage lines, a capacitor between the line voltage input and the neutral line input, a capacitor between the neutral line input and a protected earth ground, and a resistor in series between the neutral line input and the lighting control unit neutral line input port.

A luminaire includes a microcontroller and program logic that calculates the operational age of a light engine that includes a plurality of light emitting diodes connected in series. The program logic uses changes in transition voltage to calculate the operational age of a light engine. Changes in forward voltage across the light engine are used to detect sudden catastrophic failure of individual light emitting diodes. In response to the sudden catastrophic failure of one of the light emitting diodes, the program logic adjusts the power provided to the light engine based on the calculated operational age of the light engine. For example, the operational age of the light engine may be compared with a warrantied lifespan, and the power may be adjusted to increase the likelihood of compliance with the warranty.

Devices, methods, and systems for alternating current circuits for airfield lighting are described herein. One system includes a circuit comprising an isolation transformer, a protection hardware circuit coupled to the isolation transformer, wherein the protection hardware prevents a voltage between an electrical contact of the circuit and a ground contact from meeting or exceeding a threshold voltage, and a load coupled to the protection hardware circuit to receive electrical energy from the isolation transformer.