Wireless power transmission and charging system, and resonance frequency control method of wireless power transmission and charging system
First Claim
1. A resonance frequency control method of a wireless power transmitter, the method comprising:
- generating communication power used for communication in a plurality of target devices;
transmitting communication power to the plurality of target devices;
detecting a number of the plurality of target devices based on response messages corresponding to the wake-up request message;
transmitting charging power to the plurality of target devices based on the number of the plurality of target devices; and
adjusting a resonance frequency based on an amount of power received by one or more of the target devices, an amount of the charging power, a transmission efficiency of the charging power, or any combination thereof.
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Abstract
A wireless power transmission and charging system, and a communication method of the wireless power transmission and charging system are provided. In one embodiment, a resonance frequency control method of a wireless power transmitter may include: generating communication power used for communication in a plurality of target devices using a reference resonance frequency; transmitting communication power to the plurality of target devices; transmitting charging power to the plurality of target devices; and adjusting the reference resonance frequency based on a reflected wave of the charging power, the amount of power received by one or more of the target devices, the amount of the charging power, the transmission efficiency of the charging power, or any combination thereof.
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Citations
21 Claims
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1. A resonance frequency control method of a wireless power transmitter, the method comprising:
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generating communication power used for communication in a plurality of target devices; transmitting communication power to the plurality of target devices; detecting a number of the plurality of target devices based on response messages corresponding to the wake-up request message; transmitting charging power to the plurality of target devices based on the number of the plurality of target devices; and adjusting a resonance frequency based on an amount of power received by one or more of the target devices, an amount of the charging power, a transmission efficiency of the charging power, or any combination thereof. - 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 communication power used for communication, charging power used for charging in a plurality of target devices, or both; a source resonator configured to transmit, to the plurality of target devices, the communication power, the charging power, or both; and a control/communication unit configured to adjust a resonance frequency based on an amount of power received by one or more of the plurality of target devices, an amount of the charging power, a transmission efficiency of the charging power, or any combination thereof, wherein the control/communication unit is further configured to detect a number of the plurality of target devices based on response messages corresponding to a wake-up request message, and wherein the power converter is further configured to generate the charging power based on the number of the plurality of target devices. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A resonance frequency control method of a wireless power transmitter, the method comprising:
adjusting a resonance frequency of the wireless power transmitter based on an amount of power received by one or more of target devices, an amount of the charging power, a transmission efficiency of the charging power, or any combination thereof, wherein the adjusting comprises; calculating the transmission efficiency based on a level of an output voltage of a source resonator and an output current of the source resonator; determining a tracking frequency having the highest transmission efficiency among N predetermined tracking frequencies when the transmission efficiency is less than a predetermined reference value; and generating charging power using the tracking frequency having the highest transmission efficiency.
Specification