Emergency driver system for providing a low float charge power to a rechargeable battery

Abstract

An emergency driver system is disclosed for providing a low float charge power to a rechargeable battery. For one example, an emergency light emitting diode (LED) driver system includes a LED light source, a rechargeable battery, and emergency (EM) driver. The emergency LED driver system can also include a multi-color indicator circuit configured to a provide at least two LED light indicators providing information regarding the mode of operation for the EM driver. The rechargeable battery is coupled with the LED light source. The EM driver is coupled with the rechargeable battery and the LED light source. In one example, the EM driver includes a charge circuit configured to supply a charge current to the rechargeable battery, and a micro-controller unit configured to control the charge current from the charge circuit such that a power loss in at least standby mode is less than 0.5 watts (W). The rechargeable battery can be a LiFePO4 rechargeable battery providing an emergency illumination light source. By providing standby power of less than 0.5W for a LiFePO4 rechargeable battery, the EM driver with a flyback circuit followed by a buck circuit can save energy when the rechargeable battery is fully charged.

Dependencies are inferred from the claim text.