Wireless power transmitter
AssigneeWITS Co., Ltd.
InventorsSoon Tack Oh, Byoung Woo Ryu, Ji Hoon Kim, Young Seung Roh
Life of this patent
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Abstract
A power transmitter includes: a first resonator configured to wirelessly supply power to a power receiver and having an impedance that changes in response to a foreign material being proximate to the power transmitter; a second resonator having an impedance that changes in response to the foreign material being proximate to the power receiver; and controller configured to select either one of the first resonator and the second resonator in response to a wireless charging control, and to determine whether the foreign material is proximate to the power transmitter, based on a change in the impedance of the selected one of the first resonator and the second resonator.
Claims14
A power transmitter, comprising:
- a first resonator having a first impedance, the first resonator configured to wirelessly supply power to a power receiver and change the first impedance in response to a foreign material;
- a second resonator having a second impedance, the second resonator configured to change the second impedance in response to the foreign material;
- a controller configured to,
- select either one of the first resonator and the second resonator in response to a wireless charging control,
- determine whether the foreign material is proximate to the power transmitter based on the change in the first impedance of the first resonator during a preparation of wireless charging, and
- determine whether the foreign material is proximate to the power transmitter based on the change in the second impedance of the second resonator during an execution of the wireless charging;
- and
- a wireless tag reader configured to sense a wireless tag proximate to the power receiver during the execution of the wireless charging, in response to the change in the second impedance of the second resonator,
- wherein the controller is configured to immediately stop the wireless charging when the wireless tag reader senses the wireless tag, before the controller stops the wireless charging based on a determination that the foreign material is proximate to the power transmitter.
A power transmitter, comprising:
- a first resonator having a first impedance, the first resonator configured to wirelessly supply power to a power receiver, and change the first impedance in response to a foreign material;
- a second resonator having a second impedance, the second resonator configured to change the second impedance in response to the foreign material;
- a wireless tag reader configured to sense a wireless tag disposed proximate to the power receiver while the first resonator wirelessly supplies the power to the power receiver, in response to the change in the second impedance of the second resonator being detected while the first resonator wirelessly supplies the power to the power receiver;
- and
- a controller configured to,
- determine whether the foreign material is proximate to the power transmitter based on the change in the first impedance of the first resonator during a preparation of a wireless charging, and
- determine whether the foreign material is proximate to the power transmitter based on the change in the second impedance of the second resonator during an execution of the wireless charging,
- wherein the controller is configured to immediately stop the wireless charging when the wireless tag reader senses the wireless tag, before the controller stops the wireless charging based on a determination that the foreign material is proximate to the power transmitter.
Dependencies are inferred from the claim text.