Power transmission control device, power reception control device, non-contact power transmission system, power transmission device, power reception device and electronic instrument

A power reception control device provided in a power reception device of a non-contact power transmission system, the non-contact power transmission system transmitting power from a power transmission device to the power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit the power to a load of the power reception device, the power reception control device comprising:

• a power-reception-side control circuit that controls the power reception device;
• and
• a recharge monitoring circuit that monitors a recharge state of a battery included in the load after the battery has been fully charged,
• when the battery has been fully charged and the power transmission device has suspended normal power transmission and performed intermittent power transmission, the power-reception-side control circuit performing control of transmitting a recharge command to the power transmission device in an intermittent power transmission period, the recharge command indicating information relating to the recharge state of the battery.

A non-contact power transmission system comprising a power transmission device and a power reception device, the non-contact power transmission system transmitting power from the power transmission device to the power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit the power to a load of the power reception device,

• the power transmission device including a power-transmission-side control circuit that controls the power transmission device;
• the power reception device including:
• a power-reception-side control circuit that controls the power reception device;
• a full-charge detection circuit that detects whether or not the battery has been fully charged;
• and
• a recharge monitoring circuit that monitors a recharge state of the battery after the battery has been fully charged;
• when the battery has been fully charged, the power-reception-side control circuit performing control of transmitting a full-charge command that indicates that the battery has been fully charged to the power transmission device, and stopping outputting a voltage to a charge control device that controls charging the battery;
• when the power-transmission-side control circuit has received the full-charge command from the power reception device during normal power transmission to the power reception device, the power-transmission-side control circuit performing control of suspending power transmission to the power reception device during a first period, and performing control of transmitting a recharge detection command to the power reception device during an intermittent power transmission period after resuming power transmission, the recharge detection command instructing the power reception device to detect the recharge state of the battery;
• and
• the power-reception-side control circuit performing control of receiving the recharge detection command in the intermittent power transmission period, and performing control of transmitting a recharge command that indicates information relating to the recharge state of the battery to the power transmission device.