Solid-State Lighting With Emergency Power Control

A luminaire power pack comprises a rechargeable battery, an LED driving circuit, a power setting circuit, a charging circuit, and a charging detection circuit. The luminaire power pack may be used to increase functionalities of an external luminaire connected to AC mains. The LED driving circuit is configured to convert a terminal voltage from the rechargeable battery into a step-up DC voltage and to provide different output power according to power settings when a line voltage from the AC mains is unavailable. The luminaire power pack may further comprise a relay switch configured to relay either the line voltage from the AC mains or the step-up DC voltage to operate the external luminaire. The charging detection circuit is configured to enable or disable the LED driving circuit in proper situations and to meet regulatory requirements without operational ambiguity and safety issues.