Patent ID: 10461573

Abstract:
The invention relates to a power supply unit (A) and a method for operating lighting means (6). The emergency power supply unit (A) for operating an emergency lighting means (6), preferably comprising at least one LED, the emergency power supply unit (A) comprising: an energy storage unit (2) configured to providing a battery supply voltage (VBat) in case of a mains voltage loss; a monitoring unit (12) configured to monitor the battery supply voltage (VBat) value; and a controlling unit (5) configured to control the operation of the emergency power supply unit (A) based on the actual battery supply voltage (VBat) value; wherein in a first operating mode of the emergency power supply unit (A), an emergency light (60) is switched-on; wherein in a second operating mode of the emergency power supply unit (A), the controlling unit (5) is non-operative and the emergency light (60) is switched-off; and wherein in a third operating mode, the battery supply voltage (VBat) is galvanically isolated from the controlling unit (5) by a switching means (11).