Wireless power feeder, wireless power receiver, and wireless power transmission system
First Claim
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1. A wireless power feeder which performs power feed by a non-contact method to a wireless power receiver having a power receive coil,the wireless power feeder comprising:
- a power feed coil; and
a control circuit which performs power feed from the power feed coil to the power receive coil on the basis of magnetic coupling between the power feed coil and the power receive coil, by supplying AC current to the power feed coil, and which associates a frequency of the AC current with a frequency of current flowing in the power receive coil, whereinthe control circuit has;
a phase delay circuit which generates a delayed AC voltage in which the phase of an output AC voltage is delayed;
a magnetic sensor which is biased by the delayed AC voltage and detects a magnetic field generated by the power receive coil;
a phase detection circuit which generates a phase difference instruction voltage corresponding to a phase difference between an output voltage from the magnetic sensor and a comparison voltage, on the basis of the output voltage and the comparison voltage; and
an AC current generation circuit which generates the output AC voltage having a frequency based on the phase difference instruction voltage, and generates the AC current having a frequency corresponding to the frequency of the output AC voltage,whereinthe control circuit further has a plurality of magnetic sensors and an adder which adds up output signals from the plurality of magnetic sensors; and
the phase detection circuit generates a phase difference instruction voltage corresponding to a phase difference between an output voltage from the adder and a comparison voltage, on the basis of the output voltage and the comparison voltage.
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Abstract
A wireless power feeder which performs power feed by a non-contact method to a wireless power receiver having a power receive coil, this wireless power feeder having a power feed coil; and a control circuit having a phase delay device which generates a delayed AC voltage where the phase of the output AC voltage is delayed; a magnetic sensor biased by the delayed AC voltage and detects a magnetic field generated by power receive coil; phase detection circuits which generate phase difference instruction voltages corresponding to a phase difference between an output voltage from the magnetic sensor and a comparison voltage, on the basis of the output voltage and the comparison voltage; and AC current generation circuits which generate the output AC voltage having a frequency based on the phase difference instruction voltage, and generate the AC current having a frequency corresponding to the frequency of the output AC voltage.
29 Citations
18 Claims
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1. A wireless power feeder which performs power feed by a non-contact method to a wireless power receiver having a power receive coil,
the wireless power feeder comprising: -
a power feed coil; and a control circuit which performs power feed from the power feed coil to the power receive coil on the basis of magnetic coupling between the power feed coil and the power receive coil, by supplying AC current to the power feed coil, and which associates a frequency of the AC current with a frequency of current flowing in the power receive coil, wherein the control circuit has; a phase delay circuit which generates a delayed AC voltage in which the phase of an output AC voltage is delayed; a magnetic sensor which is biased by the delayed AC voltage and detects a magnetic field generated by the power receive coil; a phase detection circuit which generates a phase difference instruction voltage corresponding to a phase difference between an output voltage from the magnetic sensor and a comparison voltage, on the basis of the output voltage and the comparison voltage; and an AC current generation circuit which generates the output AC voltage having a frequency based on the phase difference instruction voltage, and generates the AC current having a frequency corresponding to the frequency of the output AC voltage, wherein the control circuit further has a plurality of magnetic sensors and an adder which adds up output signals from the plurality of magnetic sensors; and the phase detection circuit generates a phase difference instruction voltage corresponding to a phase difference between an output voltage from the adder and a comparison voltage, on the basis of the output voltage and the comparison voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A wireless power feeder which performs power feed by a non-contact method to a wireless power receiver having a power receive coil,
the wireless power feeder comprising: -
a power feed coil; and a control circuit which performs power feed from the power feed coil to the power receive coil on the basis of magnetic coupling between the power feed coil and the power receive coil, by supplying AC current to the power feed coil, and which associates a frequency of the AC current with a frequency of current flowing in the power receive coil, wherein the control circuit has; a phase delay circuit which generates a delayed AC voltage in which the phase of an output AC voltage is delayed; a magnetic sensor which is biased by the delayed AC voltage and detects a magnetic field generated by the power receive coil; a phase detection circuit which generates a phase difference instruction voltage corresponding to a phase difference between an output voltage from the magnetic sensor and a comparison voltage, on the basis of the output voltage and the comparison voltage; and an AC current generation circuit which generates the output AC voltage having a frequency based on the phase difference instruction voltage, and generates the AC current having a frequency corresponding to the frequency of the output AC voltage, wherein; the phase delay circuit generates the delayed AC voltage in which the phase of the output AC voltage is delayed by less than 360° and
not less than 30°
;the control circuit further has a plurality of magnetic sensors and an adder which adds up output signals from the plurality of magnetic sensors; and the phase detection circuit generates a phase difference instruction voltage corresponding to a phase difference between an output voltage from the adder and a comparison voltage, on the basis of the output voltage and the comparison voltage.
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18. A wireless power feeder which performs power feed by a non-contact method to a wireless power receiver having a power receive coil,
the wireless power feeder comprising: -
a power feed coil; and a control circuit which performs power feed from the power feed coil to the power receive coil on the basis of magnetic coupling between the power feed coil and the power receive coil, by supplying AC current to the power feed coil, and which associates a frequency of the AC current with a frequency of current flowing in the power receive coil, wherein the control circuit has; a phase delay circuit which generates a delayed AC voltage in which the phase of an output AC voltage is delayed; a magnetic sensor which is biased by the delayed AC voltage and detects a magnetic field generated by the power receive coil; a phase detection circuit which generates a phase difference instruction voltage corresponding to a phase difference between an output voltage from the magnetic sensor and a comparison voltage, on the basis of the output voltage and the comparison voltage; and an AC current generation circuit which generates the output AC voltage having a frequency based on the phase difference instruction voltage, and generates the AC current having a frequency corresponding to the frequency of the output AC voltage, the wireless power feeder further comprising a magnetic shield member which has an approximate U shape in cross-section, and which magnetically shields five surfaces of the magnetic sensor, apart from a power receive coil side opposing surface which opposes the power receive coil, these five surfaces being a power feed coil side opposing surface which opposes the power feed coil and four side faces which intersect with the power receive coil side opposing surface and the power feed coil side opposing surface.
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Specification
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Current AssigneeTDK Corporation
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Original AssigneeTDK Corporation
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InventorsUrano, Takashi
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Primary Examiner(s)Barnie, Rexford
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Assistant Examiner(s)INGE, JOSEPH N
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Application NumberUS13/273,723Publication NumberTime in Patent Office879 DaysField of Search307/104US Class Current307/104CPC Class CodesH02J 50/12 of the resonant typeH02J 50/70 involving the reduction of ...
