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公开(公告)号：US10923962B2
公开(公告)日：2021-02-16
申请号：US15742791
申请日：2016-07-05
申请人： Rohm Co., Ltd.
摘要： In a non-contact power feeding system which is formed with a power transmission device having a power transmission-side resonant circuit including a power transmission-side coil and a power reception device having 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, when the power is transmitted, the power transmission device monitors the amplitude of a current flowing through the power transmission-side coil. Then, when a current amplitude detection value (VmFOD) falls outside a predetermined normal range, it is determined that a foreign object is present, and thus the power transmission is stopped.
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公开(公告)号：US10756559B2
公开(公告)日：2020-08-25
申请号：US15758974
申请日：2016-09-05
申请人： ROHM CO., LTD.
发明人： Yoshihiro Ikefuji
IPC分类号： H02J7/02 , H02J50/12 , H02J50/60 , H02J50/90 , H02J50/80 , H04B5/00 , H04N5/232 , H04N5/374 , H04N5/44
摘要： In a normal mode, a power receiving device changes the resonant frequency of a power receiving side resonant circuit from a reference frequency or short-circuits a power receiving side coil for a predetermined time and then eliminates the changed or short-circuited state. Meanwhile, in the normal mode, a power transmitting device generates a test magnetic field in a power transmitting side coil during the above changed or short-circuited period and then determines, on the basis of a current amplitude detection value of the power transmitting side coil, whether a foreign object is present or not, thereby determining and controlling whether power transmission is executed or not. In a test mode, the power receiving device maintains the above changed or short-circuited state, and the power transmitting device continuously generates the test magnetic field and continuously obtains the current amplitude detection value of the power transmitting side coil.
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公开(公告)号：US20180138757A1
公开(公告)日：2018-05-17
申请号：US15804611
申请日：2017-11-06
申请人： Rohm Co., Ltd.
发明人： Yoshihiro Ikefuji , Junya Sato
CPC分类号： H02J50/60 , H02J7/025 , H02J50/12 , H02J50/80 , H04B5/0037
摘要： A non-contact power supply system includes a power transmission device including a first resonance circuit having a first coil for transmitting electric power; and a power reception device including a second resonance circuit having a second coil for receiving the electric power. The system is configured to transmit and receive the electric power by a magnetic field resonance method, and to communicate between the power transmission device and the power reception device. The power transmission device includes a power transmission circuit for supplying an AC voltage to the first resonance circuit; a detection circuit configured to detect an amplitude of a current flowing through the first coil; and a control circuit configured to control the power transmission circuit to perform power transmission control of the electric power.
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公开(公告)号：US10700554B2
公开(公告)日：2020-06-30
申请号：US15775643
申请日：2016-10-12
申请人： ROHM CO., LTD.
发明人： Yoshihiro Ikefuji
摘要： A power reception device includes a power reception-side resonant circuit which includes a power reception-side coil and a metal plate in which an opening portion is provided in a position opposite the arrangement position of the power reception-side coil, and can receive, by a magnetic field resonance method, power from a power transmission device which includes a power transmission-side resonant circuit including a power transmission-side coil. A cancellation coil is arranged between the power reception-side coil and the opening portion, and a cancellation resonant circuit including a cancellation coil is provided separately in the power reception device. When an alternating magnetic field interlinks the cancellation coil, a current which cancels out variations in the resonant frequencies of the power reception-side resonant circuit and the power transmission-side resonant circuit caused by the presence of the metal plate flows through the cancellation coil.
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公开(公告)号：US20180175676A1
公开(公告)日：2018-06-21
申请号：US15571136
申请日：2016-05-20
申请人： Rohm Co., Ltd.
发明人： Yoshihiro Ikefuji , Masahide Tanaka
摘要： 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.
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公开(公告)号：US20180019618A1
公开(公告)日：2018-01-18
申请号：US15546738
申请日：2015-12-03
申请人： Rohm Co., Ltd.
发明人： Yoshihiro Ikefuji
摘要： Disclosed is a non-contact power supply system wherein power is transmitted by means of a magnetic field resonance method from a power transmission device, which includes a power transmission-side resonant circuit, to a power reception device, which includes a power reception-side resonant circuit. The power transmission device detects, at the time of transmitting the power, a load in the power transmission, and stops the power transmission in the cases where a detection result deviates from a specified normal range. In the power reception device, a power stabilization circuit (270) that maintains output power of the power reception circuit constant is provided between a load circuit (280) and a power reception circuit (230) that outputs, toward the load circuit, power on the basis of power received by the power reception-side resonant circuit.
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公开(公告)号：US10778046B2
公开(公告)日：2020-09-15
申请号：US15736425
申请日：2016-06-08
申请人： Rohm Co., Ltd.
发明人： Yoshihiro Ikefuji , Akihiro Okui
摘要： In this non-contact power feeding system that is capable of transmitting power from a power transmitting device (1) to a power receiving device (2) by a magnetic field resonance scheme, the power transmitting device (1) is provided with first to n-th resonant circuits (TT[1]-TT[n]) which are provided with coils (TL) that are different in size, respectively, and which have a resonant frequency set to a prescribed reference frequency. Prior to power transmission, test magnetic fields are generated in sequence in the first to n-th resonant circuits to detect the amplitude of current flowing through the coils of respective resonant circuits, and the presence/absence of a foreign object is determined on the basis of the obtained first to n-th amplitude detected values, to control execution of the power transmission.
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公开(公告)号：US10530187B2
公开(公告)日：2020-01-07
申请号：US15546738
申请日：2015-12-03
申请人： Rohm Co., Ltd.
发明人： Yoshihiro Ikefuji
摘要： Disclosed is a non-contact power supply system wherein power is transmitted by means of a magnetic field resonance method from a power transmission device, which includes a power transmission-side resonant circuit, to a power reception device, which includes a power reception-side resonant circuit. The power transmission device detects, at the time of transmitting the power, a load in the power transmission, and stops the power transmission in the cases where a detection result deviates from a specified normal range. In the power reception device, a power stabilization circuit (270) that maintains output power of the power reception circuit constant is provided between a load circuit (280) and a power reception circuit (230) that outputs, toward the load circuit, power on the basis of power received by the power reception-side resonant circuit.
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公开(公告)号：US20180183277A1
公开(公告)日：2018-06-28
申请号：US15736425
申请日：2016-06-08
申请人： Rohm Co., Ltd.
发明人： Yoshihiro Ikefuji , Akihiro Okui
CPC分类号： H02J50/60 , H02J50/12 , H02J50/80 , H04B5/0037 , H04B5/0081
摘要： In this non-contact power feeding system that is capable of transmitting power from a power transmitting device (1) to a power receiving device (2) by a magnetic field resonance scheme, the power transmitting device (1) is provided with first to n-th resonant circuits (TT[1]-TT[n]) which are provided with coils (TL) that are different in size, respectively, and which have a resonant frequency set to a prescribed reference frequency. Prior to power transmission, test magnetic fields are generated in sequence in the first to n-th resonant circuits to detect the amplitude of current flowing through the coils of respective resonant circuits, and the presence/absence of a foreign object is determined on the basis of the obtained first to n-th amplitude detected values, to control execution of the power transmission.
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公开(公告)号：US10601258B2
公开(公告)日：2020-03-24
申请号：US15804611
申请日：2017-11-06
申请人： Rohm Co., Ltd.
发明人： Yoshihiro Ikefuji , Junya Sato
摘要： A non-contact power supply system includes a power transmission device including a first resonance circuit having a first coil for transmitting electric power; and a power reception device including a second resonance circuit having a second coil for receiving the electric power. The system is configured to transmit and receive the electric power by a magnetic field resonance method, and to communicate between the power transmission device and the power reception device. The power transmission device includes a power transmission circuit for supplying an AC voltage to the first resonance circuit; a detection circuit configured to detect an amplitude of a current flowing through the first coil; and a control circuit configured to control the power transmission circuit to perform power transmission control of the electric power.
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