A wireless power supply system includes a power transmission device (10a) having a power transmission coil (14) and a power receiving device (40) having a power receiving coil (41). The power transmission coil (14) transmits electric power to the power receiving coil (41) via a wireless connection, so as to supply the electric power to a battery (44) installed in the power receiving device (40). The power transmission device (10a) includes a control amount calculator (29) configured to control electric power supplied to the power transmission coil (14) according to a transmission power command value. The power receiving device (40) includes an efficiency calculator (55) configured to calculate a power transmission efficiency based on the electric power supplied to the electrical load and the transmission power command value, a relay (47) configured to switch between supply and stop of the electric power with respect to the battery (44), and a relay controller (54) configured to cut off the relay (47) to stop supplying the electric power when the power transmission efficiency falls to a threshold efficiency or less. The control amount calculator (29) regulates the output power when a current flowing through the power transmission coil (14) exceeds a threshold current.
WIRELESS POWER SUPPLY SYSTEM AND POWER TRANSMISSION DEVICE
DRAHTLOSES STROMVERSORGUNGSSYSTEM UND ENERGIEÜBERTRAGUNGSVORRICHTUNG
SYSTÈME D' ALIMENTATION ÉLECTRIQUE SANS FIL ET DISPOSITIF DE TRANSMISSION D' ÉNERGIE ÉLECTRIQUE
29.11.2017
Patent
Elektronische Ressource
Englisch
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