Patent ID: 8742719
Filing Date: 2014-06-03
Classification: B60L,H02J,Y02T

Abstract:
1. A power supply device that supplies electric power to a power receiving device including a power receiving unit in a non-contact manner, the power supply device comprising: a power source device that generates electric power with a predetermined frequency; a power transmitting unit that receives the electric power from the power source device, and that resonates with the power receiving unit through an electromagnetic field, thereby transmitting the electric power to the power receiving unit in the non-contact manner; a detection device that detects reflected electric power to the power source device; a communication device that receives a power receiving situation in the power receiving device; and a control device that controls electric power transmission from the power transmitting unit based on the power receiving situation and the reflected electric power, wherein the control device calculates a power transmission efficiency from the power supply device to the power receiving device, based on received electric power that indicates the power receiving situation, and the electric power output from the power source device, the control device controls the electric power transmission from the power transmitting unit, based on the power transmission efficiency and the reflected electric power and if the power transmission efficiency is lower than a predetermined first threshold value and the reflected electric power is lower than a predetermined second threshold value, the control device stops the electric power transmission from the power transmitting unit.