FIELD: electricity.
SUBSTANCE: wireless power supply includes a device (10a) of power transmission, which has a coil (14) for wireless transmission of power and the device (40) receiving the output having a coil (41) for wirelessly receiving power to supply electrical power to the battery (44) installed in the device (40) receiving power. The device (10a) of power transmission unit comprises (29) calculation control quantities unit configured to control electric power supplied to the coil (14) for transmitting power, according to the value of transmission power control commands. The device (40) receiving power module includes (55) computing efficiency, adapted to calculate the power transmission efficiency based on the electric power supplied to the electrical load, and the values of the transmission power control command; Relay (47) adapted to switch between feeding and stopping power supply portion relative to the battery (44), and relay controller (54) adapted to cut off the relay (47) to stop the supply of electric power when the power transmission efficiency drops to efficiency threshold or below. Module (29) for calculating control quantities adjusts the output when the current flowing through the coil (14) for transmitting power exceeds the threshold current.
EFFECT: provision of transmission power control according to the relative position of the transmitting and receiving coils.
3 cl, 17 dwg
