Foreign object detector, power transmitter, power receiver, and wireless power transmission system
First Claim
Patent Images
1. A foreign object detector, comprising:
- an oscillator circuit having a coil and a resonant capacitor, wherein the oscillator circuit outputs a voltage which includes an AC component and a DC component, the AC component having a positive cycle and a negative cycle; and
an electric circuit that detects a variation of the AC component and a variation of the DC component in the voltage output from the oscillator circuit when a foreign object approaches the coil,whereinthe coil also functions as a power transmitting coil for transmitting electric power wirelessly,the foreign object detector further includes a switch coupled to the oscillator circuit, andthe switch electrically connects the coil to other elements of the oscillator circuit in a foreign object detection mode and to electrically separate the coil from the other elements of the oscillator circuit in a power transmission mode.
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Abstract
A foreign object detector includes: an oscillator circuit 100 having a coil 110 and resonant capacitors Cx, Cy, the oscillator circuit 100 being configured to output a voltage which includes an AC component and a DC component, the AC component having a positive cycle and a negative cycle; and an electric circuit for sensing a variation of the AC component and a variation of the DC component in the voltage output from the oscillator circuit 100 when a foreign object approaches the coil 110.
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Citations
15 Claims
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1. A foreign object detector, comprising:
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an oscillator circuit having a coil and a resonant capacitor, wherein the oscillator circuit outputs a voltage which includes an AC component and a DC component, the AC component having a positive cycle and a negative cycle; and an electric circuit that detects a variation of the AC component and a variation of the DC component in the voltage output from the oscillator circuit when a foreign object approaches the coil, wherein the coil also functions as a power transmitting coil for transmitting electric power wirelessly, the foreign object detector further includes a switch coupled to the oscillator circuit, and the switch electrically connects the coil to other elements of the oscillator circuit in a foreign object detection mode and to electrically separate the coil from the other elements of the oscillator circuit in a power transmission mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A foreign object detector, comprising:
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an oscillator circuit having a coil and a resonant capacitor, wherein the oscillator circuit outputs a voltage which includes an AC component and a DC component, the AC component having a positive cycle and a negative cycle; and an electric circuit that detects a variation of the AC component and a variation of the DC component in the voltage output from the oscillator circuit when a foreign object approaches the coil, wherein the coil also functions as a power receiving coil for receiving electric power by wireless, the foreign object detector further includes a switch coupled to the oscillator circuit, and the switch electrically connects the coil to other elements of the oscillator circuit in a foreign object detection mode and to electrically separate the coil from the other elements of the oscillator circuit in a power transmission mode. - View Dependent Claims (14, 15)
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Specification