Wireless power transmission and charging system, and impedance control method thereof
First Claim
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1. An impedance control method of a wireless power transmitter configured to transmit power to at least one target device, the method comprising:
- generating power for charging by determining an impedance of a source resonator, and a signal level of a direct current (DC) voltage to be supplied to a power amplifier;
transmitting the charging power to the at least one target device through magnetic coupling;
assigning at least one virtual identifier to the at least one target device;
receiving at least one ACK message comprising the at least one virtual identifier from the at least one target device;
determining a number NT of the at least one target device based on the received at least one ACK message; and
adjusting the impedance of the source resonator based on the determined number NT of the at least one target device.
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Abstract
A wireless power transmission and charging system and method are provided. The wireless power may refer to energy that may be transferred from a wireless power transmitter to a wireless power receiver. The wireless power transmission and charging system may include a source device to wirelessly transmit power, and a target device to wirelessly receive power.
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Citations
34 Claims
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1. An impedance control method of a wireless power transmitter configured to transmit power to at least one target device, the method comprising:
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generating power for charging by determining an impedance of a source resonator, and a signal level of a direct current (DC) voltage to be supplied to a power amplifier; transmitting the charging power to the at least one target device through magnetic coupling; assigning at least one virtual identifier to the at least one target device; receiving at least one ACK message comprising the at least one virtual identifier from the at least one target device; determining a number NT of the at least one target device based on the received at least one ACK message; and adjusting the impedance of the source resonator based on the determined number NT of the at least one target device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wireless power transmitter comprising:
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a power converter configured to generate a charging power used for charging in at least one target device, by converting a direct current (DC) voltage to be supplied to a power amplifier to an alternating current (AC) voltage using a resonance frequency; a source resonator configured to transmit, to the at least one target device, the generated power through magnetic coupling; a control and communication unit configured to assign at least one virtual identifier to the at least one target device, to receive at least one ACK message including the at least one virtual identifier from the at least one target device, and to determine a number NT of the at least one target device based on the received at least one ACK message; an impedance adjusting unit configured to adjust an impedance of the source resonator based on the number NT of the at least one target device. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A wireless power receiver comprising:
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a target resonator configured to receive power from a source resonator through magnetic coupling with the source resonator; and a control and communication unit configured to detect an amount of power received by the target resonator, and to transmit, to a wireless power transmitter, information about the amount of the power received by the target resonator, wherein an impedance of the source resonator is adjusted based on a number NT of at least one target device, and wherein the at least one virtual identifier is assigned to the at least one target device, at least one ACK message including the at least one virtual identifier is received, by the wireless power transmitter, from the at least one target device, and the number NT of the at least one target device is determined, by the wireless power transmitter, based on the received at least one ACK message. - View Dependent Claims (25, 26, 27)
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28. A power receiving method of a wireless power receiver, the method comprising:
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receiving power from a wireless power transmitter through magnetic coupling; receiving a first power used for charging from the wireless power transmitter; and receiving a second power used for charging, that is generated after an impedance of the source resonator is adjusted in the wireless power transmitter, wherein the impedance of the source resonator is adjusted based on at least one of the number NT of at least one target device, and wherein the at least one virtual identifier is assigned to the at least one target device, at least one ACK message including the at least one virtual identifier is received, by the wireless power transmitter, from the at least one target device, and the number NT of the at least one target device is determined, by the wireless power transmitter, based on the received at least one ACK message. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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Specification