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.
12 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