Patent ID: 8482260

Claim:
A power management system for an electrical apparatus, the power management system comprising: a charging control unit, comprising: a charging controller, for receiving a charge-enabling signal; and a battery coupled to the charging controller, for being charged by a second voltage and for selectively supplying a battery power to the electrical apparatus via the power management system; and a power switching control unit coupled to the charging control unit, wherein the power switching control unit outputs a driving voltage to drive the electrical apparatus based on an adaptor-enabling signal and a power-detecting signal when the power switching control unit switches a plurality of input power sources and the battery power to select one of the input power sources and the battery power, and the power switching control unit actuates the charging control unit by the adaptor-enabling signal and a system-enabling signal for charging the battery by the second voltage generated from one of the input power sources; wherein the power switching control unit further comprises: a first switching unit coupled to the charging controller of the charging control unit, for generating the charge-enabling signal (SCHE) to actuate the charging control unit for charging the battery based on the second voltage (SV 2 ), the system-enabling signal (SSE) and the adaptor-enabling signal (SAE); a second switching unit coupled to an input power selecting unit and the first switching unit, for selecting one of the battery power (SBP) and the input power sources having a first voltage (SV 1 ) from the input power selecting unit for outputting the second voltage (SV 2 ) according to the adaptor-enabling signal (SAE); a third switching unit coupled to the first switching unit and the second switching unit, for generating the system-enabling signal (SSE) based on the second voltage (SV 2 ) and the power-detecting signal (SPD); and a fourth switching unit coupled to the second switching unit and the third switching unit, for generating a chip-enabling signal (SCE) based on the second voltage (SV 2 ) and the system-enabling signal (SSE) for outputting the driving voltage.