Wireless power supply system and power reception device

A wireless power supply system comprising:

• a power transmission device including a power transmission resonance circuit having a power transmission coil;
• and
• a power reception device including a power reception resonance circuit having a power reception coil,
• wherein
• the power reception device is arranged with respect to the power transmission device for charging, so that the power transmission resonance circuit and the power reception resonance circuit create electromagnetic field resonance coupling to perform wireless power supply,
• the power transmission device includes:
• a power transmission switching circuit configured to convert a DC power supplied from a DC power source on a power transmission side into a high-frequency power to be transmitted from the power transmission resonance circuit;
• and
• a power transmission switching control circuit configured to control the power transmission switching circuit,
• the power reception device includes:
• a power reception rectification circuit configured to convert the high-frequency power received by the power reception resonance circuit into a DC power;
• a battery to be charged by the DC power on a power reception side;
• a power reception rectification control circuit configured to control the power reception rectification circuit;
• and
• a power reception state detection circuit configured to detect an amount of physical energy that changes according to a power reception state,
• the power transmission device is configured to perform an intermittent power transmission operation, and
• the power reception rectification control circuit is configured to determine, based on the amount of physical energy detected by the power reception state detection circuit, whether the power reception device is in a state in which the power reception device is still continuously arranged with respect to the power transmission device or in a state in which the power reception device has been newly rearranged with respect to the power transmission device.