Method and system for ensuring a residual battery capacity reaching a predetermined value before transitioning apparatus to power-saving mode

摘要

An electronic apparatus that is capable of preventing overcharge and overdischarge of a battery. The electronic apparatus is operatable in a normal mode and a first power saving mode with less power consumption. A battery supplies electric power until battery residual capacity reaches a first threshold in the first power saving mode. A charging unit charges the battery in the normal mode. A control unit controls, in a case that the battery residual capacity is smaller than a second threshold larger than the first threshold when transition to the first power saving mode is made, so as to charge the battery until the battery residual capacity reaches the second threshold, and make a transition to the first power saving mode.

主权项

1. An electronic apparatus that is operatable in a normal mode and a first power saving mode with less power consumption than the normal mode, comprising:
a transition unit configured to transit a mode of the electronic apparatus from the normal mode to the first power saving mode; a battery configured to supply electric power to a part of the electronic apparatus in the first power saving mode; a charging unit configured to charge the battery in the normal mode; and a control unit configured to control, in a case that a battery residual amount of the battery is smaller than a first threshold when the transition unit transits the mode of the electronic apparatus from the normal mode to the first power saving mode, the charging unit to charge the battery before the transition unit transits the mode of the electronic apparatus from the normal mode to the first power saving mode, and then the transition unit to transit the mode of the electronic apparatus from the normal mode to the first power saving mode in accordance with the battery residual amount charged by the charging unit becoming the first threshold, wherein the control unit controls, in a case that the battery residual amount is larger than the first threshold when the transition unit transits the mode of the electronic apparatus from the normal mode to the first power saving mode, the transition unit to transit the mode of the electronic apparatus from the normal mode to the first power saving mode.