Patent ID: 7166989
Filing Date: 2007-01-23
Classification: H02J

Abstract:
1. A power supply system for supplying power to an electronic apparatus, the electronic apparatus including a load, said power supply system comprising: first and second battery units; a selector adapted to be coupled to the load, and coupled to said first and second battery units, said selector being operable in a first state, where said selector breaks electrical connection between said second battery unit and the load and simultaneously makes electrical connection between said first battery unit and the load such that said first battery unit supplies the power to the load, and a second state, where said selector breaks electrical connection between said first battery unit and the load and simultaneously makes electrical connection between said second battery unit and the load such that said second battery unit supplies the power to the load; a detector coupled to said selector and said first battery unit, and operable so as to detect a remaining capacity of said first battery unit and so as to compare the remaining capacity of said first battery unit with a predetermined reference value; and a controller coupled to said selector, and responsive to a first control command such that said controller overrides said detector and enables operation of said selector in the first state, said detector enabling operation of said selector in the first state when the remaining capacity of said first battery unit is higher than the predetermined reference value, said detector enabling operation of said selector in the second state when the remaining capacity of said first battery unit is lower than the predetermined reference value.