Power transmission apparatus, power transmission device, power reception device, and power transmission method

摘要

A power transmission apparatus includes a power transmission device having a power transmission amount detecting unit that transmits power and detects a power transmission amount, a power transmission device communication unit that communicates with a power reception device, and a power transmission device controller that calculates power transmission efficiency from the power transmission amount and a power reception amount and stops transmitting power if it is determined that a relationship between the power transmission amount and the power transmission efficiency lies out of an operable region, and the power reception device having a power reception amount detecting unit that receives power from the power transmission device and detects the power reception amount, a power reception device communication unit that communicates with the power transmission device, and a power reception device controller that transmits the power reception amount to the power transmission device via the power reception device communication unit.

主权项

1. A power transmission apparatus comprising:
a power transmission device including a power transmission unit that transmits power, a power transmission amount detecting unit that detects a power transmission amount transmitted by the power transmission unit, a power transmission device communication unit that performs communication, and a power transmission device controller that controls power transmission of the power transmission unit on the basis of power transmission efficiency calculated from the power transmission amount and a power reception amount; and a power reception device including a power reception unit that receives power, a power reception amount detecting unit that detects the power reception amount from output power of the power reception unit, a power reception device communication unit that communicates with the power transmission device communication unit, a power reception device controller that transmits the power reception amount to the power transmission device via the power reception device communication unit, a dummy load of which a load resistance value varies, and a switch that changes an output from the power reception unit to either a load or a dummy load, wherein the power transmission device controller stops transmitting power and makes the power reception device controller vary a resistance value of the dummy load so as to transmit the power reception amount to the power transmission device if it is determined that a relationship between the power transmission amount and the power transmission efficiency causes a power transmission loss exceeding a threshold value.