Abstract: An emergency power system (100) and emergency lighting dimming method are disclosed. The emergency power system (100) includes a power source (10), a phase-cut waveform generator (11, 13, 300, 310, 311, 400, 410, 411) coupled to the output of the power source (10) and arranged to provide a phase-cut waveform (FIGS. 2 and 3) to a load (12). The load may be one or more emergency lighting devices. A feedback detection module (14, 201) may be is used to monitor the voltage and/or current data supplied to the load (12) by the phase-cut waveform generator. A controller (13, 202-205) controls the phase-cur waveform generator (11, 13, 300, 310, 311, 400, 410, 411) to adjust the power level of the load (12) by modifying the phase-cur waveform based upon the monitored voltage and/or current data and reference data to achieve the appropriate dimming level.

Abstract: An emergency lighting ballast (100) includes: a power translation circuit (120) which receives input power from an emergency power source (10) and supplies output power to a load (20); a voltage monitor (130) that monitors voltage across the load and produces a voltage feedback signal; a current monitor (130) that monitors current across the load and produces a current feedback signal; a temperature sensor (160); and a programmable control device (140) which controls the power translation circuit (120) in response to either of the voltage feedback signal and the current feedback signal to cause the output power supplied to the load to have a programmed power output profile. The programmable control device also activates a self-test emergency state in response to a manual or preprogrammed request for a self-test, only if there is no power to the load as indicated by the voltage feedback signal and/or the current feedback signal.

Abstract: An emergency lighting driver (100, 200, 400) includes: a power translation circuit (120, 220, 421/423/425) which receives input power from an emergency power source (10) and supplies output power to a load (20); and a programmable control device (140, 240) which controls the power translation circuit in response to a voltage feedback signal and a current feedback signal to cause the output power supplied to the load to have a programmed power output profile (302, 304), wherein the programmed power output profile is a function of time, temperature, the type of energy source employed for the emergency power source, the amount of remaining energy stored in the emergency power source, and/or the occupancy of an area in which the emergency lighting driver is located.

Abstract: An emergency lighting ballast (100) includes: a power translation circuit (120) which receives input power from an emergency power source (10) and supplies output power to a load (20); a voltage monitor (130) that monitors voltage across the load and produces a voltage feedback signal; a current monitor (130) that monitors current across the load and produces a current feedback signal; a temperature sensor (160); and a programmable control device (140) which controls the power translation circuit (120) in response to either of the voltage feedback signal and the current feedback signal to cause the output power supplied to the load to have a programmed power output profile. The programmable control device also activates a self-test emergency state in response to a manual or preprogrammed request for a self-test, only if there is no power to the load as indicated by the voltage feedback signal and/or the current feedback signal.

Abstract: An emergency lighting driver (100, 200, 400) includes: a power translation circuit (120, 220, 421/423/425) which receives input power from an emergency power source (10) and supplies output power to a load (20); and a programmable control device (140, 240) which controls the power translation circuit in response to a voltage feedback signal and a current feedback signal to cause the output power supplied to the load to have a programmed power output profile (302, 304), wherein the programmed power output profile is a function of time, temperature, the type of energy source employed for the emergency power source, the amount of remaining energy stored in the emergency power source, and/or the occupancy of an area in which the emergency lighting driver is located.