PROBLEM TO BE SOLVED: To prevent an overcharge and unintended heat generation of a DC power supply at a power reception side in a power feeding steady time without giving a feeding impact nor circuit stress nor the like at the power reception side in a power feeding initial time.SOLUTION: A wireless power feeding system 1 comprises: a wireless power transmitter 20 that converts an output of a DC power supply 10 at a power transmission side into a high-frequency signal having a predetermined frequency, and outputs the high-frequency signal to a power transmission coil 22 and a wireless power receiver 30 that receives the high-frequency signal via a power reception coil 31, and feeds an output of a DC power supply 40 obtained by converting the high-frequency signal into a DC, to a load circuit 50. The wireless power transmitter 20, in a power feeding initial time, detects power feeding information of the wireless power receiver 30 on the basis of a first power P1, and in a steady power feeding time, feeds a second power P2 based on the power feeding information to the wireless power receiver 30. The first power P1 is lower than the second power P2.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【課題】 給電初期時の受電側における給電衝撃や回路ストレス等を与えることなく、給電定常時、受電側におけるDC電源の過充電や、不本意な発熱を防止できるようにする。【解決手段】無線電力給電システム1は、送電側のDC電源10の出力を所定周波数の高周波信号に変換し、当該高周波信号を送電コイル22に出力する無線電力送信器20と、高周波信号を、受電コイル31を介して受け取り、当該高周波信号を直流に変換したDC電源40の出力を負荷回路50に給電する無線電力受信器30とを備え、無線電力送信器20が、給電初期時、第1の電力P1に基づいて無線電力受信器30の給電情報を検知し、定常給電時、給電情報に基づく第2の電力P2を無線電力受信器30へ給電し、第1の電力P1は、第2の電力P2よりも低いものである。【選択図】 図1
