WIRELESS POWER FEEDER AND WIRELESS POWER TRANSMISSION SYSTEM
First Claim
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1. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil at the resonance frequency of the feeding coil and receiving coil, comprising:
- a power circuit;
the feeding coil;
an exciting coil that is magnetically coupled to the feeding coil and feeds AC power fed from the power circuit to the feeding coil; and
a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power fed from the power circuit, whereinthe power circuit includes first and second current paths and makes first and second switches connected in series respectively to the first and second current paths alternately conductive to feed the AC power to the exciting coil, andthe phase detection circuit measures the phase of current passing through both or one of the first and second switches to achieve measurement of the current phase of the AC power.
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Abstract
Power is transmitted from a feeding coil L2 to a receiving coil L2 by magnetic resonance. A power circuit 200 turns ON/OFF switching transistors Q1 and Q2 to feed AC current to an exciting circuit 110, whereby the AC power is fed from an exciting coil L1 to a feeding coil L2. A phase detection circuit 150 sets the switching transistor Q2 of the power circuit 200 as a measurement target and detects the phase difference between source-drain current IDS2 and source-drain voltage VDS2 from the current phase and voltage phase thereof.
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Citations
28 Claims
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1. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil at the resonance frequency of the feeding coil and receiving coil, comprising:
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a power circuit; the feeding coil; an exciting coil that is magnetically coupled to the feeding coil and feeds AC power fed from the power circuit to the feeding coil; and a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power fed from the power circuit, wherein the power circuit includes first and second current paths and makes first and second switches connected in series respectively to the first and second current paths alternately conductive to feed the AC power to the exciting coil, and the phase detection circuit measures the phase of current passing through both or one of the first and second switches to achieve measurement of the current phase of the AC power. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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2. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil at the resonance frequency of the feeding coil and receiving coil, comprising:
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a power circuit that feeds AC power to the feeding coil at the drive frequency; a feeding coil circuit that includes the feeding coil and a capacitor, and resonate at the resonance frequency; and a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power fed from the power circuit, wherein the power circuit includes first and second current paths and makes first and second switches connected in series respectively to the first and second current paths alternately conductive to feed the AC power to the feeding coil, and the phase detection circuit measures the phase of current passing through both or one of the first and second switches to achieve measurement of the current phase of the AC power. - View Dependent Claims (3, 26)
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10. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil at the resonance frequency of the feeding coil and receiving coil, comprising:
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a resonance circuit that includes a first coil and a capacitor which are connected in series; a first switch that controls supply of power fed from a first direction to the resonance circuit; a second switch that controls supply of power fed from a second direction to the resonance circuit; a power transmission control circuit that makes the first and second switches alternately conductive to cause the resonance circuit to resonate to transmit AC power from the first coil serving as the feeding coil to the receiving coil; a second coil that generates inductive current using a magnetic field generated by the AC power; and a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power, wherein the phase detection circuit measures the phase of the inductive current flowing in the second coil to achieve measurement of the current phase of the AC current. - View Dependent Claims (11, 12, 13, 14, 15, 16, 27)
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17. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil at the resonance frequency of the feeding coil and receiving coil, comprising:
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a power circuit; the feeding coil; an exciting coil that is magnetically coupled to the feeding coil and feeds AC power fed from the power circuit to the feeding coil; a detection coil that generates inductive current using a magnetic field generated by the AC power; and a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power, wherein the power circuit includes first and second current paths and makes first and second switches connected in series respectively to the first and second current paths alternately conductive to feed the AC power to the exciting coil, and the phase detection circuit measures the phase of the inductive current flowing in the detection coil to achieve measurement of the current phase of the AC power. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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18. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil at the resonance frequency of the feeding coil and receiving coil, comprising:
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a power circuit that feeds AC power to the feeding coil at the drive frequency; a feeding coil circuit that includes the feeding coil and a capacitor, and resonate at the resonance frequency; a detection coil that generates inductive current using a magnetic field generated by the AC power of the feeding coil circuit; and a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power, wherein the power circuit includes first and second current paths and makes first and second switches connected in series respectively to the first and second current paths alternately conductive to feed the AC power to the feeding coil circuit, and the phase detection circuit measures the phase of inductive current passing through the detection coil to achieve measurement of the current phase of the AC power. - View Dependent Claims (28)
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Specification