Abstract: A step-down module (10) for an emergency power system (100) is disclosed. The step-down module (10) includes a step-down circuit (11) to which an AC power source (40) having an input voltage higher than 277 VAC can be connected, the step-down circuit arranged to convert the input voltage to an output voltage in the range of 120 to 277 VAC. A sensing module 14 is arranged to detect a state of an emergency driver relay (21) from an emergency lighting fixture (20). When the emergency driver relay (21) is closed, a normal operation mode is active and when the emergency driver relay (21) is open, an emergency operation mode is active. The normal operation mode is when the AC power source (40) is suppling AC power to the step-down circuit (11) and the emergency operation mode is when the AC power source (40) is not suppling AC power. A control relay (13) arranged to connect or disconnect the AC power source (40) from the emergency lighting fixture (20.

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.