FOREIGN OBJECT DETECTOR, POWER TRANSMITTER, POWER RECEIVER, AND WIRELESS POWER TRANSMISSION SYSTEM
First Claim
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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.
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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
16 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification