Patent ID: 8683248

Claim:
An electronic apparatus, comprising: a first power source to generate power to be used for the electronic apparatus from power supplied from an external power source; a photovoltaic power generation device to generate power having a voltage corresponding to an intensity of external light received by the photovoltaic power generation device as cell-generated power; a power storage device to store the cell-generated power generated by the photovoltaic power generation device; a second power source to generate power to be used for the electronic apparatus from the cell-generated power stored in the power storage device; a mode switching unit to switch between a normal power supply mode and a reduced-power mode, wherein in the normal power supply mode power is supplied from the first power source to each unit in the electronic apparatus while in the reduced-power mode the power supply from the first power source to each unit in the electronic apparatus is stopped and power is supplied from the second power source to only certain predetermined units in the electronic apparatus; a voltage detector to detect the voltage of the cell-generated power output from the photovoltaic power generation device; a memory to store a given number of condition-specific threshold voltages useable to determine a given number of specific conditions of the electronic apparatus; and a power supply controller to compare the voltage of the cell-generated power detected by the voltage detector and the condition-specific threshold voltages and control the mode switching unit to switch between the normal power supply mode and the reduced-power mode.