Wireless power transmitter, wireless power receiver and wireless power transmission method
First Claim
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1. A wireless power transmitter comprising:
- a first coil;
a second coil coupled to the first coil to transmit power by using resonance;
a detection unit for detecting a state of a receiving side; and
a power regulator for adjusting the transmit power according to the detection result of the detection unit,wherein the detection unit comprises;
a first power detector for detecting a first power of a power source and outputting a first signal;
a second power detector for detecting a second power of the second coil and outputting a second signal;
a third coil coupled to the second coil to detect an intensity of a magnetic field of the second coil, wherein the intensity of the magnetic field of the second coil is converted into the second signal by the second power detector; and
a comparator for outputting a control signal according to the comparing result of the first signal with the second signal;
wherein the first power detector detects the first power of the power source before the first power is transmitted to the first coil.
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Abstract
Disclosed is a wireless power transmitter. A wireless power transmitter includes a transmission coil for generating a magnetic field by receiving power from a power source, a transmission resonant coil for transmitting power to a receiving coil by using the magnetic field generated from the transmission coil by using resonance, a detection unit for detecting an approach of the receiving coil and a power regulator for adjusting an output of the power source, which supplies the power, based on the approach of the receiving coil detected by the detection unit.
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Citations
14 Claims
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1. A wireless power transmitter comprising:
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a first coil; a second coil coupled to the first coil to transmit power by using resonance; a detection unit for detecting a state of a receiving side; and a power regulator for adjusting the transmit power according to the detection result of the detection unit, wherein the detection unit comprises; a first power detector for detecting a first power of a power source and outputting a first signal; a second power detector for detecting a second power of the second coil and outputting a second signal; a third coil coupled to the second coil to detect an intensity of a magnetic field of the second coil, wherein the intensity of the magnetic field of the second coil is converted into the second signal by the second power detector; and a comparator for outputting a control signal according to the comparing result of the first signal with the second signal; wherein the first power detector detects the first power of the power source before the first power is transmitted to the first coil. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless power transmitter which wirelessly transmits power to a wireless power receiver, the wireless power transmitter comprising:
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a power source for generating an AC electrical current; a power transmission coil for converting the AC electrical current to a magnetic field and transmitting the power to the wireless power receiver; a detection unit for detecting an environmental condition of the power transmission coil; and an impedance matching circuit comprising a capacitor, wherein the wireless power transmitter controls the power according to the environmental condition of the power transmission coil detected by the detection unit; wherein the detection unit compares a first voltage signal based on the AC electrical current with a second voltage signal based on the environmental condition, wherein the wireless power transmitter is configured to reduce or terminate transmission of the power if a result of the comparison performed by the detection unit is below a predetermined value, and wherein the first voltage signal compared by the detection unit is a signal prior to any impedance matching by the impedance matching circuit. - View Dependent Claims (8, 9, 10)
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11. A wireless power transmission method comprising:
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generating an AC electrical current from a power source; converting, by a power transmission coil of a wireless power transmitter, the AC electrical current to a magnetic field; transmitting, by the power transmission coil, the power to a wireless power receiver; determining, by a detection unit, an environmental condition of the power transmission coil; and comparing, by the detection unit, a first voltage signal based on the AC electrical current with a second voltage signal based on the environmental condition; wherein the wireless power transmitter is configured to reduce or terminate transmission of the power if a result of the comparison performed by the detection unit is below a predetermined value, and wherein the first voltage signal compared by the detection unit is a signal prior to any impedance matching. - View Dependent Claims (12, 13, 14)
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Specification