Control device, power receiving device, electronic apparatus, and contactless power transmission system

A contactless power transmission system comprising a power transmitting device and a power receiving device,

• wherein the power transmitting device transmits power to the power receiving device,
• the power receiving device supplies power to a load based on power received by a power receiving portion, and performs communication in which communication data is transmitted to the power transmitting device,
• the power receiving device starts the communication when an output voltage of the power receiving portion becomes higher than a first voltage,
• the power transmitting device receives transmitting power setting information from the power receiving device that has started the communication as the communication data, and performs control of transmitting power based on the transmitting power setting information, and
• the power receiving device starts to supply the power to the load when the output voltage of the power receiving portion becomes higher than a second voltage that is different from the first voltage as a result of the power transmitting device performing control of transmitting power.

A control device to be used in a power receiving device that receives power from a power transmitting device by contactless power transmission, the control device comprising:

• a power supply portion that supplies power to a load based on power received by a power receiving portion;
• a communication portion that performs communication in which communication data is transmitted to the power transmitting device by load modulation using a first pattern and a second pattern that define load modulation patterns, wherein the first pattern is a pattern in which a duration of a period in a first load state is longer than a corresponding period in the second pattern;
• and
• a processor that acts as a control portion that controls the power supply portion and the communication portion to cause the communication portion to start the communication and start the power supply based on the modulation patterns.