Control device, power receiving device, electronic device, contactless power transmission system, and control method

A control device that controls a power receiving device that receives electric power supplied from a power transmission device by contactless power transmission, the control device comprising:

• a charging-system circuit that receives electric power supplied from the power transmission device, and charges a charging subject based on the received electric power;
• and
• a discharging-system circuit that operates based on electric power from the charging subject, and supplies power to a processing device based on electric power from the charging subject,
• wherein the charging-system circuit has a charging-system control circuit that operates based on electric power received by the charging-system circuit during the charging, and
• a measurement circuit that measures a voltage of the charging subject,
• the charging-system control circuit, when the voltage of the charging subject measured by the measurement circuit is higher than a threshold voltage corresponding to an excessively discharged state, releasing a shutdown state in which discharge from the charging subject is stopped.

A contactless power transmission system, comprising:

• a control device on a power transmission side that controls a power transmission device;
• and
• a control device on a power receiving side that controls a power receiving device that receives electric power supplied from the power transmission device by contactless power transmission,
• wherein the control device on the power receiving side has a charging-system circuit that receives electric power supplied from the power transmission device, and charges a charging subject based on the received electric power, and
• a discharging-system circuit that operates based on electric power from the charging subject, and supplies power to a processing device based on electric power from the charging subject,
• the control device on the power transmission side sending a shutdown release notification to the control device on the power receiving side when detected that the power receiving device is docked to the power transmission device, and
• the control device on the power receiving side, when the shutdown release notification has been received, releasing a shutdown state in which discharge from the charging subject is stopped.

A control method of a contactless power transmission system including a control device on a power transmission side that controls a power transmission device, and a control device on a power receiving side that controls a power receiving device that receives electric power supplied from the power transmission device by contactless power transmission, the method comprising:

• the control device on the power transmission side sending a shutdown release notification to the control device on the power receiving side when detected that the power receiving device is docked to the power transmission device;
• the control device on the power receiving side, when the shutdown release notification has been received, releasing a shutdown state in which discharge from the charging subject is stopped;
• and
• the control device on the power receiving side receiving electric power supplied from the power transmission device, charging the charging subject based on the received electric power, and supplying power to a processing device based on electric power from the charging subject.