PHASE DIFFERENCE DETECTION METHOD, PHASE DIFFERENCE DETECTION CIRCUIT, AND WIRELESS POWER TRANSMISSION DEVICE
First Claim
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1. A method used by a phase difference detection circuit for detecting a phase difference between two signals, the method comprising:
- shifting a detected phase difference between the two signals by an offset value;
outputting the detected phase difference; and
controlling the offset value such that the outputted detected phase difference falls within a phase difference range between a lower limit and an upper limit.
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Abstract
A method used by a phase difference detection circuit for detecting a phase difference between two signals includes shifting a detected phase difference between the two signals by an offset value, outputting the detected phase difference, and controlling the offset value such that the outputted detected phase difference falls within a phase difference range between a lower limit and an upper limit.
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Citations
9 Claims
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1. A method used by a phase difference detection circuit for detecting a phase difference between two signals, the method comprising:
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shifting a detected phase difference between the two signals by an offset value; outputting the detected phase difference; and controlling the offset value such that the outputted detected phase difference falls within a phase difference range between a lower limit and an upper limit. - View Dependent Claims (2, 3, 4)
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5. A phase difference detection circuit for detecting a phase difference between two signals, the phase difference detection circuit comprising:
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a phase detector to shift a detected phase difference between the two signals by an offset value and output the detected phase difference; and an offset controller to control the offset value such that the detected phase difference outputted by the phase detector falls within a phase difference range between a lower limit and an upper limit. - View Dependent Claims (6, 7, 8)
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9. A wireless electric power transmission device comprising:
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an electric power source; a plurality of converters to convert outputs from the electric power source to wireless signals, respectively; a phase detector to detect a phase difference between two signals selected from a plurality of wireless signals of the converters, and to shift the detected phase difference to an offset value and then output the detected phase difference; an offset controller to control the offset value such that the outputted detected phase difference falls within a phase difference range; an error detector to detect an error between the detected phase difference outputted by the phase detector and a set phase difference; and a phase controller to control at least one signal phase of the two signals according to the error detected by the error detector.
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Specification