Emergency lighting for an aircraft has a primary power source for light units 9 provided by the normal aircraft power supply 11 and a secondary power source provided by power supply units 15 operable to back-up the primary power source. Each light unit 9 may have its own power supply unit 15 operable to power the light unit 9 in an emergency if the normal aircraft power supply fails or is otherwise unable to power the emergency lighting. Each power supply unit 15 includes one or more electric double layer capacitors 15a that are charged whenever the normal aircraft power supply is operational to provide the primary power source. The useful life of the electric double layer capacitors 15a may be prolonged by reducing the capacitor voltage when the emergency lighting is switched off.
Aircraft emergency lighting
Flugzeugnotbeleuchtung
Éclairage de secours pour aéronef
2019-03-06
Patent
Electronic Resource
English