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公开(公告)号：US09692238B2
公开(公告)日：2017-06-27
申请号：US14609530
申请日：2015-01-30
摘要： A power transmitting device includes a power transmitting circuit that converts second DC power input from a DC power supply to AC power, a power transmitting antenna and a control circuit that receives a voltage value of the first DC power from the power receiving device. The control circuit changes a frequency of the AC power that is transmitted to the power receiving antenna, detects, from the received voltage values, a first frequency corresponding to a local minimum value of the voltage values and a second frequency corresponding to the voltage value that takes a local maximum value at a frequency higher than the first frequency, and sets the frequency of the AC power transmitted to the power receiving antenna to a frequency between the first frequency and the second frequency.
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公开(公告)号：US11056919B2
公开(公告)日：2021-07-06
申请号：US15956204
申请日：2018-04-18
IPC分类号： H02J50/60 , H02J50/12 , H02J50/10 , H02J50/40 , H02J50/70 , H02J50/80 , H02J50/90 , H01F38/14 , H02J5/00 , H02J7/02 , H02J7/00
摘要： A power transmission device includes power transmission coils arranged in a line, a power transmission circuit connected to the power transmission coils and supplying the AC power to the power transmission coils, and control circuitry that switches an electrical connection state between the power transmission circuit and each of the power transmission coils, detect a relative position between the power receiving coil and each of the power transmission coils, selects a number of power transmission coils adjacent to each other based on the detected relative position, the selected number of power transmission coils being fixed, and causes the power transmission circuit to supply the AC power to the selected number of power transmission coils. In an array direction of the power transmission coils, a width Dwt of each of the power transmission coils is shorter than a width Dwr of the power receiving coil and Dwt/Dwr≤0.875.
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公开(公告)号：US09979235B2
公开(公告)日：2018-05-22
申请号：US14805058
申请日：2015-07-21
IPC分类号： H02J5/00 , H02J50/10 , H02J7/00 , H02J50/12 , H01F38/14 , H02J50/40 , H02J50/90 , H02J50/70 , H02J50/80 , H02J50/60 , H02J7/02
CPC分类号： H02J50/12 , H01F38/14 , H02J5/00 , H02J5/005 , H02J7/0042 , H02J7/0044 , H02J7/025 , H02J50/10 , H02J50/40 , H02J50/60 , H02J50/70 , H02J50/80 , H02J50/90
摘要： A power transmission device includes power transmission coils arranged in a line in a plane, a power transmission circuit connected to the power transmission coils and supplying AC power, and a control circuit controlling a connection state between the power transmission circuit and each power transmission coil. The length of each power transmission coil in the array direction is shorter than that of the power receiving coil in that direction, the length thereof in a direction perpendicular to the array direction in the plane is longer than that of the power receiving coil in that direction, and the control circuit selects adjacent power transmission coils whose number is fixed based on the relative position of the power receiving coil with respect to the power transmission coils and switches the above connection state such that the AC power is supplied to the selected power transmission coils.
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公开(公告)号：US11962163B2
公开(公告)日：2024-04-16
申请号：US17333150
申请日：2021-05-28
IPC分类号： H02J50/12 , H01F38/14 , H02J5/00 , H02J7/00 , H02J50/10 , H02J50/40 , H02J50/60 , H02J50/70 , H02J50/80 , H02J50/90
CPC分类号： H02J50/12 , H01F38/14 , H02J5/00 , H02J7/0042 , H02J7/0044 , H02J50/10 , H02J50/60 , H02J50/70 , H02J50/80 , H02J50/90
摘要： A power transmission device includes power transmission coils arranged in a line, a power transmission circuit connected to the power transmission coils, and control circuitry that switches an electrical connection between the power transmission circuit and each power transmission coil, detects a relative position between the power receiving coil and each power transmission coil, selects two or more power transmission coils adjacent to each other based on the detected relative position, and causes the power transmission circuit to supply the AC power to the selected two or more power transmission coils. In an array direction of the power transmission coils, a width Dwt of each power transmission coil is shorter than a width Dwr of the power receiving coil. In a direction perpendicular to the array direction, a width Dlt of each power transmission coil is equal to or longer than a width Dlr of the power receiving coil.
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公开(公告)号：US09991748B2
公开(公告)日：2018-06-05
申请号：US14935502
申请日：2015-11-09
摘要： A power transmission device includes: an oscillator including first through fourth switching devices, and converting DC power into AC power by pulses supplied thereto; a power transmission antenna delivering the AC power to a load of a power receiving device; memory holding a predetermined value indicating at least one of required voltage, current, and power; a receiving circuit receiving information of at least one of voltage, current, and power, supplied to the load; and a control circuitry changing a phase difference Δθ between pulses supplied to the first and fourth switching devices, and between pulses supplied to the second and third switching devices, thereby changing voltage of the AC power, deciding frequency of AC power where efficiency is greatest, converging the at least one of voltage, current, and power, of which information has been received, to the predetermined value range, and outputting AC power where the efficiency is the greatest.
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公开(公告)号：US09859720B2
公开(公告)日：2018-01-02
申请号：US14937852
申请日：2015-11-10
IPC分类号： G06F7/44 , G06G7/12 , H02J5/00 , H02J50/70 , H02J50/40 , H02J50/12 , H01F38/14 , H02J17/00 , H02J7/02 , H02J50/10 , H02J50/90 , H02J50/60 , H01F27/36
CPC分类号： H02J50/12 , H01F27/365 , H01F38/14 , H02J5/005 , H02J7/025 , H02J17/00 , H02J50/10 , H02J50/40 , H02J50/60 , H02J50/70 , H02J50/90
摘要： In a power transmission device including a power transmission coil that is disposed to oppose an installation surface of the power transmission device on which a power receiving device is installed and that is capable of being electromagnetically coupled with the power receiving coil. A magnetic substance is disposed at least outside the power transmission coil to oppose the installation surface via the power transmission coil and to be electromagnetically coupled with the power transmission coil. A object detecting circuit detects a metal object existing at least outside the power transmission coil by supplying first AC power to the power transmission coil and detecting a change in at least one of a voltage, a current, and a frequency of the first AC power or a voltage or current of a DC component of the first AC power.
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