A LIGHTING POWER SUPPLY SYSTEM AND METHOD

A power supply system for a lighting unit comprises a driver, a local energy storage device and a converter. The converter implements a first, charging mode, mode by connecting to the output of said driver for diverting at least a part of the driving current from the lighting unit to charge the energy storage device, a second, battery driving, mode by connecting to the lighting unit for convertingthe local energy storage device power supply to drive the lighting unit, and a third, grid driving, mode to neither charge the energy storage device nor convert the secondary power supply. The converter and the driver are controlled actively and synchronously to maintain the current through the lighting unit when switching the converter between modes. 一种用于照明单元的功率供应系统，包括驱动器、本地能量存储设备和转换器。转换器通过连接到所述驱动器的输出端来从照明单元分流驱动电流的至少一部分以为能量存储设备充电来实施第一充电模式，通过连接到照明单元来转换本地能量存储设备功率供应以驱动照明单元来实现第二电池驱动模式，以及既不为能量存储设备充电也不转换二次功率供应的第三电网驱动模式。当在模式之间切换转换器时，转换器和驱动器被主动且同步地控制，以保持通过照明单元的电流。