Detection device, power reception device, power transmission device and non-contact power supply system
First Claim
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1. A power receiving device comprising:
- a resonance circuit that includes a power receiving coil electrically coupled to a resonance capacitor;
a memory configured to store a predetermined reference Q value; and
a control circuit configured to control a charge operation with respect to a battery and to control a load modulation circuit to communicate with a power transmitting device;
wherein the predetermined reference Q value is determined in advance based on where the power receiving device is disposed relative to the power transmitting device.
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Abstract
A detection device, including: one or a plurality of magnetic coupling elements configured to have one or a plurality of coils; and a detection unit that measures or calculates an effective resistance values of the magnetic coupling elements or an effective resistance value of a circuit including at least the magnetic coupling elements and determines a presence or absence of a foreign substance based on a change in the effective resistance value.
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Citations
27 Claims
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1. A power receiving device comprising:
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a resonance circuit that includes a power receiving coil electrically coupled to a resonance capacitor; a memory configured to store a predetermined reference Q value; and a control circuit configured to control a charge operation with respect to a battery and to control a load modulation circuit to communicate with a power transmitting device; wherein the predetermined reference Q value is determined in advance based on where the power receiving device is disposed relative to the power transmitting device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power transmitting system comprising;
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a power receiving device including a resonance circuit including a power receiving coil electrically connected to a resonance capacitor, a memory configured to store a previously determined reference Q value, and a control circuit configured to control a charge operation with respect to a battery and to control a load modulation circuit to communicate with a power transmitting device, and the power transmitting device including a foreign substance detection circuit configured to measure a Q value of a power transmitting coil and to compare the measured Q value with the previously determined reference Q value, wherein the previously determined reference Q value is based on the relative positions of the power receiving device and the power transmitting device. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification