Feed unit, feed system, and electronic device for increasing power supplied to a battery based on a device state and/or a control of a charging current

Abstract

A feed unit includes: a power transmission section configured to perform power transmission using a magnetic field or an electric field, to a device to be fed including a secondary battery; and a power-transmission control section configured to control power transmission operation in the power transmission section. In a charging period in which charging to the secondary battery is performed based on transmitted power in the power transmission, when the device to be fed including the secondary battery is activated, the power-transmission control section controls the power transmission operation, to increase the transmitted power.

1 . An electronic device, comprising:
 a power receiving coil configured to receive wireless power transmitted from a feed device;   a voltage converting circuit configured to generate a predetermined voltage based on the transmitted power;   a battery configured to receive the power from the voltage converting circuit; and   a control circuit configured to transmit a request to the feed device to:
 (i) decrease the transmitted power by one step in response to the transmitted power being larger than a minimum power value, and 
 (ii) increase the transmitted power by one step in response to the transmitted power being smaller than the minimum power value.