Electronic device, battery charger, and electronic device battery-charging system

摘要

An object of the present invention is to provide an electronic device capable of receiving payment of a charge required for a charging process even though a secondary battery of the electronic device ran into an overdischarge state and also extricating itself from the overdischarge state, and a charger used for the same. A charger (3) executes a power transmission before it conducts a proximity noncontact communication with an electronic device (2), continues this power transmission until a preliminary charging stop notification signal is sent from the electronic device (2), and conducts the proximity noncontact communication regarding to a billing process with the electronic device (2) when the preliminary charging stop notification signal is sent. After the communication regarding to the billing process is ended, the charger (3) gives a charge of electricity to the electronic device (2) again. The electronic device (2) charges a secondary battery (28) by using the power transmission, then executes the charging up to a level at which the proximity noncontact communication regarding to the billing process can be conducted, then conducts the proximity noncontact communication regarding to the billing process with the charger (3), and then restarts the power transmission from the charger (3) to execute the charging until the secondary battery (28) is fully charged. In this manner, the noncontact charging and the proximity noncontact communication are executed between the electronic device (2) and the charger (3) in a time-division system.

主权项

1. An electronic device comprising:
a power receiving coil configured to receive an electric power from a charger by electromagnetic induction; a secondary battery configured to be charged with the received electric power; an antenna configured to conduct a proximity noncontact communication with the charger; and a charging and communication controlling section configured to control the charging of the secondary battery and the proximity noncontact communication, wherein, if a voltage of the secondary battery is below a first value, the charging and communication controlling section controls a first charging of the secondary battery with the electric power received via the power receiving coil until the voltage of the secondary battery becomes the first value or more; wherein the proximity noncontact communication is conducted after the first charging is conducted; and wherein a second charging of the secondary battery is conducted until the voltage of the secondary battery becomes a second value larger than the first value after the proximity noncontact communication is conducted.