Wireless power transmitter, wireless power receiver, and method for controlling same
First Claim
1. A control method of a wireless power transmitter for transmitting charging power to a wireless power receiver, the control method comprising:
- adjusting an internal impedance of the wireless power transmitter such that an impedance change occurring when the wireless power receiver is placed is set to a second impedance change different from a first impedance change;
applying detection power for detecting the wireless power receiver;
detecting the second impedance change and detecting the wireless power receiver while applying the detection power; and
changing the impedance change occurring when the wireless power receiver is placed from the second impedance change to the first impedance change,wherein the second impedance change is larger than the first impedance change.
1 Assignment
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Accused Products
Abstract
Disclosed is a method for controlling a wireless power transmitter for transmitting charging power to a wireless power receiver. The control method of the present invention comprises the steps of: adjusting the internal impedance of the wireless power transmitter such that the impedance variation occurring when the wireless power receiver is positioned is set to a second impedance variation different from the first impedance variation; applying detection power for detecting the wireless power receiver; detecting the second impedance variation during the application of the detection power so as to detect the wireless power receiver; and changing the impedance variation occurring when the wireless power receiver is positioned from the second impedance variation to the first impedance variation.
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Citations
25 Claims
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1. A control method of a wireless power transmitter for transmitting charging power to a wireless power receiver, the control method comprising:
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adjusting an internal impedance of the wireless power transmitter such that an impedance change occurring when the wireless power receiver is placed is set to a second impedance change different from a first impedance change; applying detection power for detecting the wireless power receiver; detecting the second impedance change and detecting the wireless power receiver while applying the detection power; and changing the impedance change occurring when the wireless power receiver is placed from the second impedance change to the first impedance change, wherein the second impedance change is larger than the first impedance change. - View Dependent Claims (2, 3, 4, 5)
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6. A wireless power transmitter for transmitting charging power to a wireless power receiver, the wireless power transmitter comprising:
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an impedance change unit that sets an impedance change occurring when the wireless power receiver is placed to one of a first impedance change and a second impedance change; a power transmission unit that transmits the charging power to the wireless power receiver; and a control unit that performs a control operation for setting the impedance change occurring when the wireless power receiver is placed to a second impedance change, applying detection power for detecting the wireless power receiver to the power transmission unit, and changing the impedance change occurring when the wireless power receiver is placed from the second impedance change to the first impedance change, when detecting the second impedance change and detecting the wireless power receiver while applying the detection power, wherein the second impedance change is larger than the first impedance change. - View Dependent Claims (7, 8, 9, 10)
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11. A control method of a wireless power receiver for receiving charging power from a wireless power transmitter, the control method comprising:
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setting an internal impedance of the wireless power receiver to a second impedance different from a first impedance; detecting an impedance change condition for changing the internal impedance of the wireless power receiver from the second impedance to the first impedance or receiving an impedance change command from the wireless power transmitter; and changing the internal impedance of the wireless power receiver from the second impedance to the first impedance when detecting the impedance change condition or receiving the impedance change command, wherein an impedance change occurring when the wireless power receiver is placed on the wireless power transmitter corresponds to a first impedance change, when the internal impedance of the wireless power receiver corresponds to the first impedance, and wherein an impedance change occurring when the wireless power receiver is placed on the wireless power transmitter corresponds to a second impedance change, when the internal impedance of the wireless power receiver corresponds to the second impedance, wherein the second impedance change is larger than the first impedance change. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A wireless power receiver for receiving charging power from a wireless power transmitter, the wireless power receiver comprising:
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an impedance change unit that sets an internal impedance of the wireless power receiver to one of a first impedance and a second impedance different from the first impedance; and a control unit that changes the internal impedance of the wireless power receiver from the second impedance to the first impedance when detecting an impedance change condition for changing the internal impedance of the wireless power receiver from the second impedance to the first impedance, wherein an impedance change occurring when the wireless power receiver is placed on the wireless power transmitter corresponds to a first impedance change, when the internal impedance of the wireless power receiver corresponds to the first impedance, and wherein an impedance change occurring when the wireless power receiver is placed on the wireless power transmitter corresponds to a second impedance change, when the internal impedance of the wireless power receiver corresponds to the second impedance, wherein the second impedance change is larger than the first impedance change. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A wireless power receiver for receiving charging power from a wireless power transmitter, the wireless power receiver comprising:
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an impedance change unit that sets an internal impedance of the wireless power receiver to one of a first impedance and a second impedance different from the first impedance; a communication unit that receives, from the wireless power transmitter, an impedance change command which changes the internal impedance of the wireless power receiver from the second impedance to the first impedance; and a control unit that changes the internal impedance of the wireless power receiver from the second impedance to the first impedance when the impedance change command is received, wherein an impedance change in the wireless power transmitter occurring due to placement of the wireless power receiver on the wireless power transmitter corresponds to a first impedance change, when the internal impedance of the wireless power receiver corresponds to the first impedance, wherein the impedance change in the wireless power transmitter occurring due to placement of the wireless power receiver on the wireless power transmitter corresponds to a second impedance change, when the internal impedance of the wireless power receiver corresponds to the second impedance, and wherein the second impedance change is larger than the first impedance change.
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24. A wireless power transmitter for transmitting charging power to a wireless power receiver, the wireless power transmitter comprising:
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a power transmission unit that transmits the charging power to the wireless power receiver; a control unit that applies detection power for detecting the wireless power receiver to the power transmission unit, and detects an impedance change and detects the wireless power receiver for a period during which the detection power is applied; and a communication unit that transmits an impedance change command which changes an internal impedance of the wireless power receiver from a second impedance to a first impedance different from the second impedance, when the wireless power receiver has been detected, wherein the impedance change occurring due to placement of the wireless power receiver on the wireless power transmitter corresponds to a first impedance change, when the internal impedance of the wireless power receiver corresponds to the first impedance, wherein the impedance change occurring due to placement of the wireless power receiver on the wireless power transmitter corresponds to a second impedance change, when the internal impedance of the wireless power receiver corresponds to the second impedance, and wherein the second impedance change is larger than the first impedance change.
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25. A control method of a wireless power transmitter for transmitting charging power to a wireless power receiver, the control method comprising:
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applying detection power for detecting the wireless power receiver; detecting an impedance change and detecting the wireless power receiver for a period during which the detection power is applied; and transmitting an impedance change command which changes an internal impedance of the wireless power receiver from a second impedance to a first impedance different from the second impedance, when the wireless power receiver has been detected, wherein the impedance change occurring due to placement of the wireless power receiver on the wireless power transmitter corresponds to a first impedance change, when the internal impedance of the wireless power receiver corresponds to the first impedance, wherein the impedance change occurring due to placement of the wireless power receiver on the wireless power transmitter corresponds to a second impedance change, when the internal impedance of the wireless power receiver corresponds to the second impedance, and wherein the second impedance change is larger than the first impedance change.
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Specification