A light-emitting diode (LED) lamp comprising a normally-operated portion and an emergency-operated portion is used to replace a luminaire operated only in a normal mode with alternate-current (AC) mains. The normally-operated portion comprises a second driving circuit whereas the emergency-operated portion comprises a rechargeable battery, a first driving circuit, a self-diagnostic circuit, and a control circuit. The LED lamp can auto-switch between the normal mode and an emergency mode according to availability of the AC mains and whether a rechargeable battery test is initiated. The control circuit is configured to produce a pulse train with a predetermined duty cycle to operate the first driving circuit while disabling the second driving circuit to eliminate operational ambiguity during the rechargeable battery test. The self-diagnostic circuit is configured to provide multiple sequences and to auto-evaluate battery performance by sending the pulse train to operate the first driving circuit according to the multiple sequences.

In order to add an emergency light function to a fluorescent LED lighting device, thereby increasing safety during a power outage, this LED lighting device, which can be mounted between a pair of sockets for fluorescent lighting, is equipped with a first power supply circuit, which lights the LED using direct current power obtained by converting/rectifying alternating current power supplied from the sockets, and a second power supply circuit, which lights the LED using an embedded battery. An embedded SW controller detects that a sudden drop in the current value or the voltage value in the lighting device, from a prescribed value Von when the lighting switch is turned on to a value that is essentially zero, occurs within a prescribed time T. When the sudden drop occurs two or more times in the prescribed time (FIG. 5), it is determined that a normal operation of turning off the light has been performed, and the light is turned off, and when the sudden drop occurs only once during the prescribed time (FIG. 6), it is determined that a power outage has occurred, and the LED is lighted as an emergency light using the second power supply circuit.

An emergency LED lighting system maintains power to an LED lighting source based on measured voltages and currents provided to the LED lighting source; rolls back or decreases power provided to an LED lighting source over time in order to increase the amount of time the battery can power the LED lighting source; executes a soft start procedure, such that the power provided to the LED lighting source is gradually ramped up during activation of the LED lighting sources; identifies a type of battery coupled to the emergency LED lighting system; cycles the emergency LED lighting system between charging mode and standby mode to reduce power consumption over a window of time; detects AC power or an absence of AC power; and/or uses a status LED to communicate information about the emergency LED lighting system with a remote device.

An LED light fixture includes a housing, a controller circuit having direct current (DC) and alternating-current (AC) power inputs, a direct-current (DC) power supply unit (PSU) connected to the controller circuit, an alternating-current (AC) PSU connected to the controller circuit, and at least two groups of light emitting diodes (LEDs) operable to emit light, wherein each group includes at least one LED of a first type and at least one LED of a second type. In some embodiments, when the LED light fixture operates in a security mode the controller prevents power from flowing to the AC PSU and allows power to flow to the DC PSU to power only the first type of LEDs of the at least two groups of LEDs to emit a security light.

A light-emitting sign device according to the present invention comprises: a solar cell; a battery module comprising at least one battery in which power generated by the solar cell is stored; a light-emitting module for emitting light by the power supplied from the battery; a front panel optically coupled to the light-emitting module; and a controller for applying, to the light-emitting module, a target mode determined, from among driving modes, on the basis of an average value of solar cell voltages measured for a certain period with respect to the solar cell and a voltage value of a battery voltage measured at a certain time with respect to the battery module.

A luminaire arrangement for providing lighting in or near buildings. The luminaire arrangement may contain one or more of the following components: (i) at least one portable luminaire, which has a body and a lamp arrangement, (ii) at least one energy store, which is connected to the luminaire, is rechargeable, and is designed to supply electrical power to the lamp arrangement of the luminaire; and (iii) at least one charging device, which is designed to recharge the energy store. The energy store is attachable by means of an interface arrangement to the charging device in order to at least one of recharge the energy store and supply power to the lamp arrangement. The energy store is separable from the charging device in order to take the luminaire as necessary to any target location to be lit.

An illumination device and a ventilator with a light are disclosed. The ventilator includes: a fan electrically connecting to a power transmitting port to be driven for generating an airflow; a light for transferring electrical power into light; a power storage module electrically connecting with the light and the power transmitting port; and a control unit electrically connecting with the power storage module and the power transmitting port, wherein the control unit determines whether the power transmitting port provides electrical power, the control unit controls the power storage module to store electrical power sourced from the power transmitting port if a result of the determination is positive, and the control unit controls the power storage module to output electrical power stored therein to the light if the result of the determination is negative.

A linear light-emitting diode (LED) lamp comprising a normally-operated portion and an emergency-operated portion is used to replace a luminaire operated only in a normal mode with alternate-current (AC) mains. The normally-operated portion comprises a fly-back converter whereas the emergency-operated portion comprises a rechargeable battery, a bidirectional circuit, a boost converter, a self-diagnostic circuit, and a control circuit. The linear LED lamp can auto-switch from the normal mode to an emergency mode according to availability of the AC mains and whether a rechargeable battery test is initiated. The bidirectional circuit is configured to convey a forward electric current and a reverse electric current to and from the rechargeable battery, respectively. The self-diagnostic circuit is configured to provide multiple sequences and to auto-evaluate battery performance according to the multiple sequences. During an auto-evaluation period, a terminal voltage on the rechargeable battery is examined with test results displayed in a status indicator.

The described embodiments relate to systems, methods, and apparatuses for providing a lighting system that includes backup light emitting diodes (LEDs) that are incorporated into a primary array of LEDs of the lighting system. The backup LEDs can be illuminated when a utility power source for the lighting system becomes unavailable. The backup LEDs can operate from a backup power supply, which can be charged from the utility power source, when the utility power source is available. Furthermore, charging of the backup power supply can be temperature dependent, in order that the backup power supply and/or the charging circuit can be protected from damage caused by operating such components out of an operating specification.

A light-emitting diode (LED) luminaire emergency driver comprises a rechargeable battery, a power supply unit, an LED driving circuit, a first control circuit, and a second control circuit. The LED driving circuit and the power supply unit each comprises a scalable power control scheme respectively configured to drive external LED arrays with different power levels when the alternate-current (AC) mains are unavailable and to power the first control circuit and to charge the rechargeable battery with different capacity when the AC mains are available. The second control circuit comprises two switches configured to control discharging and charging of the rechargeable battery. The second control circuit further comprises a relay switch circuit configured to control either a first LED driving current from the LED driving circuit or a second LED driving current from an external power supply unit to drive the external LED arrays without crosstalk.