Emergency lighting system
An emergency lighting system including a plurality of lights including a first group of lights and a second group of lights, a switching circuit, and a controller. The switching circuit includes a relay. The relay has a first position, in which power from the driver is provided to the first group of lights and the second group of lights; and a second position, in which power from the auxiliary power supply is provided to the second group of lights. The controller is configured to output a signal to the emergency control input when an input voltage is below a threshold. Wherein, the switching circuit places the relay in the second position upon receiving the signal at the emergency control input.
1. An emergency lighting system comprising:
a mains power supply;
an auxiliary power supply;
a brown-out circuit configured to extract input voltage information related to a voltage level of the mains power supply, wherein the brown-out circuit scales down an input voltage of the mains power supply to a DC voltage proportional to the voltage level;
a plurality of lights including a first group of lights and a second group of lights;
a driver configured to provide power;
a switching circuit including
a driver input configured to receive power from the driver,
an auxiliary power input configured to receive power from the auxiliary power supply,
an emergency control input, and
a relay having a first position, in which power from the driver is provided to the first group of lights and the second group of lights, and a second position, in which power from the auxiliary power supply is provided to the second group of lights;
a controller configured to
receive the DC voltage from the brown-out circuit, the DC voltage indicative of the voltage level of the mains power supply; and
output a signal to the emergency control input when the input voltage is below a threshold;
wherein the switching circuit places the relay in the second position upon receiving the signal at the emergency control input.
2. The emergency lighting system of claim 1 , wherein the first group of lights are directed in a first direction and the second group of lights are directed in a second direction.
3. The emergency lighting system of claim 2 , wherein the first direction and the second direction are the same.
4. The emergency lighting system of claim 1 , wherein power is not provided to the first group of lights when the input voltage is below the threshold.
5. The emergency lighting system of claim 1 , wherein the first group of lights and the second group of lights are within a housing.
6. The emergency lighting system of claim 5 wherein the charging circuit, the auxiliary power supply, the driver, the switching circuit, and the controller are within the housing.
7. The emergency lighting system of claim 1 , wherein the controller is further configured to perform at least one selected from a group consisting of controlling the charging state of a charging circuit module, identifying a brown-out or brown-in condition, monitoring the voltage of the auxiliary power supply, and controlling a drive level of the driver.