Patent ID: 8410749
Filing Date: 2013-04-02
Classification: H01M,H02J,Y02E

Abstract:
1. A power supply device connectable to an electronic device comprising a first battery, the power supply device comprising: a fuel cell; and a second battery, wherein the power supply device is configured to alternately switch a state between a first state in which the fuel cell and the second battery supply electric power to the electronic device as well as charge the first battery and a second state in which the fuel cell charges the second battery as well as the first battery supplies electric power to the electronic device, in the first state, integrated discharge electric power and integrated discharge amount of the second battery are calculated and, when the integrated discharge electric power reaches a predetermined amount, the state is switched to the second state, and in the second state, integrated charge amount of the second battery is calculated and, when the integrated charge amount reaches the integrated discharge amount, the state is switched to the first state.