公开(公告)号：US10432029B2

公开(公告)日：2019-10-01

申请号：US15768327

申请日：2016-09-09

Applicant: ROHM CO., LTD.

Inventor： Yoshihiro Ikefuji

IPC: H02J50/12 ,  H02J50/80 ,  H02J50/60 ,  H04B5/00 ,  H02J7/02 ,  H04W4/80

Abstract: In a non-contact power feeding system which is formed with a power transmission device that includes a power transmission-side resonant circuit including a power transmission-side coil and a power reception device that includes a power reception-side resonant circuit including a power reception-side coil and which can transmit and receive power by a magnetic field resonance method, the control circuit of the power transmission device supplies, before the power transmission, a predetermined determination alternating current voltage to the power transmission-side resonant circuit so as to detect the amplitude of a current flowing through the power transmission-side coil at that time. The control circuit controls the performance of the power transmission based on the current amplitude detection value.

公开(公告)号：US09819213B2

公开(公告)日：2017-11-14

申请号：US14672553

申请日：2015-03-30

Applicant: Rohm Co., Ltd.

Inventor： Yoshihiro Ikefuji

IPC: H01M10/44 ,  H01M10/46 ,  H02J7/02 ,  H04B5/00 ,  H02J50/12 ,  H02J50/60 ,  H02J50/80

CPC classification number: H02J7/025 ,  H02J50/12 ,  H02J50/60 ,  H02J50/80 ,  H02J50/90 ,  H04B5/0037 ,  H04B5/0093

Abstract: A power reception apparatus includes a power receiving circuit to be connected to a power reception side resonance circuit including a power reception side coil and a power reception side capacitance, for generating an output power based on power received by the power reception side coil utilizing magnetic resonance, a changing/short-circuiting circuit configured to change a resonance frequency of the power reception side resonance circuit from a reference frequency that is the resonance frequency when receiving the power, or to short-circuit the power reception side coil, before receiving the power.

公开(公告)号：US10998767B2

公开(公告)日：2021-05-04

申请号：US15755284

申请日：2016-07-15

Applicant: ROHM CO., LTD.

Inventor： Yoshihiro Ikefuji ,  Takeshi Seike ,  Yusuke Yoshii

IPC: H02J50/12 ,  H02J50/60 ,  H02J7/02 ,  H03F3/217 ,  H02J50/80

Abstract: This power transmission apparatus transmits power to a power reception apparatus by means of a magnetic field resonance system by supplying an output AC voltage (VE) of a class E amplifier to a power-transmission side resonance circuit (TT). Before the transmission of power, the output AC voltage (VE) of the class E amplifier is divided, and a voltage obtained by the division is supplied to the power-transmission side resonance circuit (TT). A current amplitude detection value of a power-transmission side coil (TL) at this time is obtained as an evaluation value, and whether to permit execution of power transmission is controlled on the basis of the evaluation value, through determination as to whether a foreign object is present or not.

公开(公告)号：US10424977B2

公开(公告)日：2019-09-24

申请号：US15571136

申请日：2016-05-20

Applicant: Rohm Co., Ltd.

Inventor： Yoshihiro Ikefuji ,  Masahide Tanaka

IPC: H02J7/02 ,  H02J50/90 ,  H02J50/10 ,  H02J50/80 ,  H02J7/00 ,  H04B5/00 ,  H04W52/02 ,  H02J50/12

Abstract: Provided is a charging system characterized by being provided with: a mobile device including a first NFC antenna and a rechargeable battery which is charged on the basis of a current induced in the first NFC antenna by electromagnetic induction; and a charger including a second NFC antenna which causes electromagnetic induction to be induced in the first NFC antenna, and a supply unit which supplies the second NFC antenna with a feed current for inducing the electromagnetic induction; and in that the charging system is further provided with a control means for causing an intended electromagnetic induction to arise between the first NFC antenna and the second NFC antenna.