Contactless power feeding system, vehicle, power feeding facility and method of controlling contactless power feeding system

摘要

When an impedance adjustment process of a resonant system is started, a power feeding facility outputs power for adjustment. Then, an ECU of the power feeding facility adjusts an impedance matching box provided in the power feeding facility, and when the adjustment is completed, transmits an instruction for adjustment in a vehicle to the vehicle. When the vehicle receives the adjustment instruction from the power feeding facility, the vehicle adjusts an impedance matching box provided in the vehicle. That is, in this contactless power feeding system, the impedance adjustment in the power feeding facility is performed first, and the adjustment in the vehicle is performed thereafter.

主权项

1. A contactless power feeding system comprising:
a power feeding facility; and a power receiving apparatus for receiving electric power in a contactless manner from the power feeding facility; the power feeding facility including:
a power supply device for generating electric power having a prescribed frequency;a power transmission unit for receiving the power from the power supply device, and resonating with the power receiving apparatus through an electromagnetic field to transmit the power in a contactless manner to the power receiving apparatus;a first variable impedance device provided between the power supply device and the power transmission unit;a first control device that adjusts the first variable impedance device; anda first communication device that transmits information on the power feeding facility and a position mismatch amount to the power receiving apparatus; the power receiving apparatus including:
a power reception unit for resonating with the power transmission unit through the electromagnetic field to receive the power in a contactless manner from the power transmission unit;a load for receiving the power received by the power reception unit;a second variable impedance device provided between the power reception unit and the load;a second control device for adjusting the second variable impedance device; anda second communication device capable of establishing communication with the first communication device, the second communication device transmitting information on the power receiving apparatus to the power feeding facility; the first control device adjusting the first variable impedance device prior to adjustment of the second variable impedance device in the power receiving apparatus, the first control device adjusting the first variable impedance device by using the information on the power receiving apparatus received by the first communication device, the first control device further adjusting the first variable impedance device based on the position mismatch amount, which is estimated based on the information on the power receiving apparatus and corresponds to a position mismatch of the power transmission unit relative to the power reception unit, the second control device adjusting the second variable impedance device after the adjustment of the first variable impedance device by the first control device, the second control device adjusting the second variable impedance device by using the information on the power feeding facility received by the second communication device and the position mismatch amount which is received by the second communication device.