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 of target device, the method comprising:
- generating power for charging by determining an impedance of a source resonator, and adjusting a voltage level of a direct current (DC) voltage to be supplied to a power amplifier;
transmitting the charging power to the at least one of target device through magnetic coupling; and
adjusting the impedance of the source resonator based on one or more of a reflected wave of the charging power, an amount of power received by each of the at least one of target device, an amount of the charging power, or a transmission efficiency of the charging power.
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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.
48 Citations
29 Claims
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1. An impedance control method of a wireless power transmitter configured to transmit power to at least one of target device, the method comprising:
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generating power for charging by determining an impedance of a source resonator, and adjusting a voltage level of a direct current (DC) voltage to be supplied to a power amplifier; transmitting the charging power to the at least one of target device through magnetic coupling; and adjusting the impedance of the source resonator based on one or more of a reflected wave of the charging power, an amount of power received by each of the at least one of target device, an amount of the charging power, or a transmission efficiency of the charging power. - 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 of 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 at least one of target device, the generated power through magnetic coupling; and an impedance adjusting unit configured to adjust an impedance of the source resonator based on one or more of a reflected wave of the charging power, an amount of power received by each of the at least one of target device, an amount of the charging power, or a transmission efficiency of the charging power. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. 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 at least one of a reflected wave of the charging power, an amount of a power received by the target resonator, an amount of the charging power, or a transmission efficiency of the charging power. - View Dependent Claims (22, 23)
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24. 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 one or more of at reflected wave of the first power used for charging, an amount of the first power used for charging, or a transmission efficiency of the first power used for charging. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification