ELECTROMAGNETICALLY-COUPLED STATE DETECTION CIRCUIT, POWER TRANSMISSION APPARATUS, CONTACTLESS POWER TRANSMISSION SYSTEM, AND ELECTROMAGNETICALLY-COUPLED STATE DETECTION METHOD
First Claim
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1. An electromagnetically-coupled state detection circuit comprising:
- a detection unit that measures a primary side Q value of a circuit containing a primary side coil electromagnetically coupled with a secondary side coil and power transmission efficiency to the secondary side coil, corrects the power transmission efficiency based on the Q value of the primary side coil, and detects a state of electromagnetic coupling with the secondary side coil based on an obtained corrected value of the power transmission efficiency.
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Abstract
An electromagnetically-coupled state detection circuit including a detection unit that measures a primary side Q value of a circuit containing a primary side coil electromagnetically coupled with a secondary side coil and power transmission efficiency to the secondary side coil, corrects the power transmission efficiency based on the Q value of the primary side coil, and detects a state of electromagnetic coupling with the secondary side coil based on an obtained corrected value of the power transmission efficiency.
36 Citations
18 Claims
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1. An electromagnetically-coupled state detection circuit comprising:
a detection unit that measures a primary side Q value of a circuit containing a primary side coil electromagnetically coupled with a secondary side coil and power transmission efficiency to the secondary side coil, corrects the power transmission efficiency based on the Q value of the primary side coil, and detects a state of electromagnetic coupling with the secondary side coil based on an obtained corrected value of the power transmission efficiency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power transmission apparatus comprising:
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a primary side coil electromagnetically coupled with a secondary side coil; and a detection unit that measures a primary side Q value of a circuit containing the primary side coil and power transmission efficiency to the secondary side coil, corrects the power transmission efficiency based on the Q value of the primary side coil, and detects a state of electromagnetic coupling with the secondary side coil based on an obtained corrected value of the power transmission efficiency. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A contactless power transmission system comprising:
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a power transmission apparatus that wirelessly transmits power; and a power receiving apparatus that receives the power from the power transmission apparatus, wherein the power receiving apparatus includes a secondary side coil electromagnetically coupled with a primary side coil of the power transmission apparatus, and a secondary side communication unit that communicates with the power transmission apparatus, and wherein the power transmission apparatus includes the primary side coil electromagnetically coupled with the secondary side coil of the power receiving apparatus, a primary side communication unit that communicates with the power receiving apparatus, and a detection unit that measures a primary side Q value of a circuit containing the primary side coil and power transmission efficiency to the secondary side coil based on information about the power receiving apparatus received by the primary side communication unit, corrects the power transmission efficiency based on the Q value of the primary side coil, and detects a state of electromagnetic coupling with the secondary side coil based on an obtained corrected value of the power transmission efficiency.
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18. An electromagnetically-coupled state detection method comprising:
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measuring a primary side Q value of a circuit containing a primary side coil electromagnetically coupled with a secondary side coil and power transmission efficiency to the secondary side coil; and correcting the power transmission efficiency based on the Q value of the primary side coil and detecting a state of electromagnetic coupling with the secondary side coil based on an obtained corrected value of the power transmission efficiency.
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Specification