Patent ID: 8018091
Filing Date: 2011-09-13
Classification: G06F,H02J

Abstract:
1. A selectable backup power supply device for providing power to a real time clock (RTC) and a volatile memory unit, when a main battery is at a predetermined voltage level, comprising: a backup battery, for outputting a backup voltage; a first power outputting unit, connected to the backup battery and the RTC, for receiving the backup voltage and outputting a first supply voltage to the RTC; a user selectable signal enabling a standard mode and premium mode power operation; and a second power outputting unit, connected to the backup battery and the volatile memory unit, for receiving the backup voltage and, in accordance with the selection signal, outputting a second supply voltage to the volatile memory unit or stopping the output of the second supply voltage to said volatile memory unit; wherein said standard mode comprises outputting said second supply voltage to said volatile memory unit and said RTC, and said premium mode comprises stopping output of said second supply voltage to said volatile memory unit while supplying said secondary supply voltage to said RTC.