WIRELESS POWER FEEDER, WIRELESS POWER RECEIVER, AND WIRELESS POWER TRANSMISSION SYSTEM
First Claim
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.
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Accused Products
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.
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Citations
17 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification