Power supply device and power supply system

A power supply device comprising:

• a first coil part and a second coil part capable of wirelessly transmitting and receiving power to and from a movable object;
• a power transmission request part configured to transmit a power transmission request to the movable object,
• wherein at least one of the first coil part or the second coil part receive power transmitted by the moveable object in response to the moveable object receiving the power transmission request;
• a power reception information acquisition part configured to acquire, from at least one of the first coil part or the second coil part, at least one of first power reception information indicating a power reception state of the first coil part or second power reception information indicating a power reception state of the second coil part after the power transmitted by the moveable object is received;
• a movable object position determination part configured to determine whether the movable object is positioned at, at least one of a first power supply position for transmitting and receiving power to and from the first coil part, or a second power supply position for transmitting and receiving power to and from the second coil part based on at least one of the first power reception information and the second power reception information;
• and
• a power transmission control part configured to cause the first coil part to transmit power when the movable object position determination part determines that the movable object is positioned at the first power supply position, and cause the second coil part to transmit power when the movable object position determination part determines that the movable object is positioned at the second power supply position.