Wireless power transfer method and apparatus and method of detecting resonant frequency used in wireless power transfer
First Claim
1. A wireless power transfer apparatus comprises:
- a plurality of transmission coils, each of which transmits power to a receiver coil through magnetic resonance;
a signal generator transmitting signals having different resonant frequencies to the plurality of transmission coils, the signal generator being connected to the plurality of transmission coils; and
a feedback unit transferring information on amounts of powers which are respectively output by the plurality of transmission coils to the signal generator,wherein each Q factor of the plurality of transmission coils is greater than a O factor of the receiver coil.
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Accused Products
Abstract
Disclosed herein are a wireless power transfer apparatus, a method for wireless power transfer and a method of detecting a resonant frequency used in a wireless power charging system or a wireless power transfer. The wireless power transfer apparatus includes a plurality of transmission coils, each of which transmits power to a receiver coil through magnetic resonance; a signal generator transmitting signals having different resonant frequencies to the plurality of transmission coils, the signal generator being connected to the plurality of transmission coils; and a feedback unit transferring information on amounts of powers which are respectively output by the plurality of transmission coils to the signal generator.
2 Citations
19 Claims
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1. A wireless power transfer apparatus comprises:
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a plurality of transmission coils, each of which transmits power to a receiver coil through magnetic resonance; a signal generator transmitting signals having different resonant frequencies to the plurality of transmission coils, the signal generator being connected to the plurality of transmission coils; and a feedback unit transferring information on amounts of powers which are respectively output by the plurality of transmission coils to the signal generator, wherein each Q factor of the plurality of transmission coils is greater than a O factor of the receiver coil. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for wireless power transfer, the method comprising:
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transmitting a signal having a specific frequency to a plurality of transmission coils, the transmission coils transmitting powers to a receiver coil through magnetic resonance; detecting amounts of powers which are respectively output by the plurality of transmission coils in response to the signal; detecting a resonant frequency used for a maximum power transfer by each of the plurality of transmission coils on the basis of the detected amounts of powers; changing a frequency of each of the transmission coils to the resonant frequency used for the maximum power; and transmitting power having a changed resonant frequency to each of the plurality of transmission coils, wherein the resonant frequency is a frequency that reduces interference between the plurality of transmission coils. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of detecting a resonant frequency used in a wireless power transfer, the method comprising:
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transmitting a small signal having a specific frequency to a plurality of transmission coils, the small signal having a small amount of power in contrast with an amount of power in a normal-state power transfer of each of the plurality of transmission coils; detecting amounts of powers which are respectively output by the plurality of transmission coils in response to the small signal; and detecting a resonant frequency used for a maximum power transfer of each of the plurality of transmission coils on the basis of the detected amounts of powers, wherein the resonant frequency is a frequency that reduces interference between the plurality of transmission coils. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification