Underwater power supply system and power-receiving device

An underwater power supply system comprising:

• a power transmission device;
• and
• a power reception device configured to be capable of moving underwater, wherein the power transmission device includes
• a power transmission coil configured to transmit electric power to the power reception device via a magnetic field, and
• a power transmission side processor configured to control the electric power from a power transmission power supply and supply the electric power to the power transmission coil,
• the power reception device includes
• a power reception coil configured to receive electric power from the power transmission coil,
• a power reception power supply including a plurality of general-purpose power supply components and a storage battery, and configured to charge the storage battery based on the electric power received by the power reception coil and based on the plurality of general-purpose power supply components,
• a power reception side processor configured to periodically control a charging current to the storage battery, and
• a current sensor configured to detect the charging current,
• when it is determined that a value of the detected charging current is a current value outside a predetermined range, the power reception side processor calculates a feedback control parameter to the power reception power supply based on a difference between the value of the charging current and a target current value, and
• the power reception power supply controls the charging current to the storage battery based on the feedback control parameter to charge the storage battery.

A power reception device that is configured to be capable of moving underwater and that receives electric power transmitted from a power transmission device including a power transmission coil, the power reception device comprising:

• a power reception coil configured to receive electric power from the power transmission coil;
• a power reception power supply including a plurality of general-purpose power supply components and a storage battery, and configured to charge the storage battery based on the electric power received by the power reception coil and based on the plurality of general-purpose power supply components;
• a power reception side processor configured to periodically control a charging current to the storage battery;
• and
• a current sensor configured to detect the charging current,
• wherein when it is determined that a value of the detected charging current is a current value outside a predetermined range, the power reception side processor calculates a feedback control parameter to a power transmission power supply based on a difference between the value of the charging current and a target current value, and instructs, to the power transmission device, power control from the power transmission power supply based on the feedback control parameter.

A power reception device that is configured to be capable of moving underwater and that receives electric power transmitted from a power transmission device including a power transmission coil, the power reception device comprising:

• a power reception coil configured to receive electric power from the power transmission coil;
• a power reception power supply including a plurality of general-purpose power supply components and a storage battery, and configured to charge the storage battery based on the electric power received by the power reception coil and based on the plurality of general-purpose power supply components;
• a power reception side processor configured to periodically control a charging current to the storage battery;
• and
• a current sensor configured to detect the charging current,
• wherein when it is determined that a value of the detected charging current is a current value outside a predetermined range, the power reception side processor calculates a feedback control parameter to the power reception power supply based on a difference between the value of the charging current and a target current value, and
• wherein the power reception power supply controls the charging current to the storage battery based on the feedback parameter to charge the storage battery.