A contactless power supply has a dynamically configurable tank circuit powered by an inverter. The contactless power supply is inductively coupled to one or more loads. The inverter is connected to a DC power source. When loads are added or removed from the system, the contactless power supply is capable of modifying the resonant frequency of the tank circuit, the inverter frequency, the inverter duty cycle or the rail voltage of the DC power source.

An abnormality detection apparatus (100) is configured to detect an abnormality of a lighting device (200). The abnormality detection apparatus (100) includes an illuminance sensor (110), a memory (120) and a controller (130). The controller (130) is configured to detect the abnormality of the lighting device (200) based on a criterion stored in the memory (120) and a difference between an illuminance detected by the illuminance sensor (110) during on state of the lighting device (200) and an illuminance detected by the illuminance sensor (110) during off state of the lighting device (200).

Provided is a technique that facilitates control of a navigation light which uses light-emitting diodes for a light source. This navigation light control system is provided with: a navigation light that has a light source for which a light-emitting diode is used; a power supply unit that supplies power to the navigation light; and a control device that controls lighting of the navigation light, wherein the control device is provided with a light source circuit that supplies the power received from the power supply unit to the light source, and a determination unit that determines failure of the light source on the basis of the value of the current flowing through a resistor connected to the light source circuit.

A resistor bypass circuit for a series lighting circuit includes a plurality of serially connected light sources and a bypass resistor being connected in parallel with at least one of the respective light sources, each respective light source being low wattage and being capable operating on a one hundred percent duty cycle as desired.

A system and method provide fail-safe operation of a lighting system. A lighting level detector is used to obtain a baseline lighting level for a low-intensity light. If the detector measures less than the baseline level when an occupancy sensor determines the space is unoccupied, a high-intensity light is energized and an indication is provided to a user that the low-intensity light has failed. A method provides daylighting operation of a lighting system. An occupancy sensor can have Wi-Fi functionality to enable remote configuration of the sensor. A line voltage occupancy sensor can include an interface with low voltage devices. An occupancy sensor can include an integral interface to enable an external control system to override the sensor's normal logic under emergency conditions. An occupancy sensor can include an active temperature compensation feature. An occupancy sensor can also incorporate an automatically adjustable coverage area.

Devices and methods for protecting against a surge in a luminaire are provided. For example, a controller for use with a luminaire is provided. The controller can include a first circuit configured to sense a surge in voltage or current. The controller can further include a second circuit configured to switch a relay in response to the first circuit having sensed the surge in voltage or current.

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 invention relates to a lighting load abnormality detecting device, the device including a power supply module, which is configured to provide power supply for the detecting device and the lighting load connected with the detecting device; a detecting circuit is configured to detect the abnormal state of the lighting load; a control module is configured to judge whether the lighting load is abnormal or not according to the detecting circuit feedback detection information; the detecting circuit includes a parallel PWM detection circuit and a static detection circuit; the static detecting circuit is configured to independently detect anomalies when the abnormality detecting device has no pulse loading or to cooperate with the pulse width modulation detecting circuit to jointly detect anomalies when there is pulse loading.

An anti-flicker and anti-glow switchable load apparatus to be installed in the light socket of a commonly powered electronic switching device, such as a motion activated light switch. An energy efficient light bulb or lamp, such as a cathode fluorescent lamp or light emitting diode is then electrically connected to the apparatus. A first embodiment of the present invention includes a switchable light source, a switchable load, a controller, and a voltage sensor. When the present invention in the first embodiment detects a higher voltage, thus indicating the lamp has been switched from the off state to the on state, the switchable load is disconnected, and the current is re-routed to pass through the energy efficient lamp.

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.