Feed unit, feed system, and electronic device

A feed system, comprising:

• a device including a secondary battery;
• and
• a feed unit configured to transmit power, via a magnetic field or an electric field, to the device, the feed unit including
• a power transmission coil configured to transmit the power to the device, and
• a power-transmission control circuit configured to control power transmission operation of the power transmission coil, wherein
• the power-transmission control circuit controls, when the device is in a charging period and the load of the device is activated, the power transmission coil to increase the power transmitted to the device by achieving a power value necessary in the activation of the load according to a request from the device, and
• the power-transmission control circuit controls, when the device is in the charging period and the load of the device is not activated, to increase or decrease by one step the transmitted power based on whether or not the request indicates a one-step-down.

An electronic device, comprising:

• a power receiving coil configured to receive power transmitted, via a magnetic field or an electric field, from a feed unit;
• a secondary battery configured to store the power received by the power receiving coil;
• and
• a control circuit configured to
• control charging of the secondary battery, and
• notify the feed unit, when a the electronic device is in a charging period and a load of the electronic device is either activated or not activated, of a request to adjust the power transmission, wherein
• when the electronic device is in the charging period and the load of the electronic device is activated,
• the feed unit increases the power transmitted to the power receiving coil by achieving a power value necessary in the activation of the load according to the request, and
• when the electronic device is in the charging period and the load of the electronic device is not activated, the feed unit increases or decreases by one step the transmitted power based on whether or not the request indicates a one-step-down.

A feed system, comprising:

• a device;
• and
• a feed unit configured to transmit power, via a magnetic field or an electric field, to the device,
• the device including
• a power receiving coil configured to receive the power transmitted from the feed unit,
• a secondary battery configured to store the power received by the power receiving coil, and
• a control circuit configured to
• control charging of the secondary battery, and
• notify the feed unit, when the device is in a charging period and a load of the device is either activated or not activated, of a request to adjust the power transmission, wherein
• the power transmitted by the feed unit, received by the power receiving coil, is increased when the request indicates that the device is in the charging period and the load of the device is activated,
• the feed unit increases the power transmitted to the power receiving coil by achieving a power value necessary in the activation of the load according to the request, and
• when the device is in the charging period and the load of the device is not activated, the feed unit increases or decreases by one step the transmitted power based on whether or not the request is a one-step-down.