Bi-directional boost converter for emergency lighting

This paper presents a distributed storage/emergency lighting upgrade circuit that can be added to LED lighting fixtures. In contrast to conventional designs that are mostly supplied by a voltage source, we present an example of an emergency lighting circuit that is supplied by a constant current source (LED driver) in charging/ lighting mode. We also compare the performance of the same circuit when it is supplied by a voltage source in emergency lighting mode by the battery. Notwithstanding its low component count, the discussed concept reaches an efficiency of 94%, and has a simple control scheme that provides dimming functionality for non-dimmable LED drivers.