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
2017-11-29
Patent
Electronic Resource
English
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