Wireless power transmission device and control method therefor
地域：
Seoul
摘要
The present specification which relates to a wireless power transmission device and a control method, capable of transmitting and receiving power wirelessly comprises a power supply unit for supplying power to a receiving device to transmit power wirelessly; and a power transmission control unit for, periodically generating a waveform with a particular frequency, measuring an attenuation coefficient of the waveform at each cycle, measuring a variation in the attenuation coefficient at each cycle, and determining the type of an external material. The present invention has a technical feature wherein the power transmission control unit determines whether to transmit power wirelessly to the receiving device on the basis of the type of the external material.
說明書
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This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2014/008853, filed on Sep. 23, 2014, which claims the benefit of earlier filing date and right of priority to Korean Application Nos. 10-2013-0131454, filed on Oct. 31, 2013 and 10-2014-0086202, filed on Jul. 9, 2014, and also claims the benefit of U.S. Provisional Application No. 61/906,895, filed on Nov. 21, 2013, the contents of which are all hereby incorporated by reference herein in their entirety.
1. Field of the Invention
The present disclosure relates to a wireless power transmitter, and a control method thereof.
2. Description of the Related Art
In general, instead of the traditional method of supplying electrical energy to wireless power receivers in a wired manner, in recent years, the method of contactlessly supplying electrical energy to in a wireless manner has been used. The wireless power receiver that receives energy in a wireless manner may be directly driven by the received wireless power, or a battery may be charged using the received wireless power so as to allow the wireless power receiver to be driven by the charged power.
權(quán)利要求
What is claimed is:1. A wireless power transmitter capable of transmitting and receiving power in a wireless manner, the wireless power transmitter comprising:a power supply unit configured to supply power to transmit power to a receiver in a wireless manner; and a power transmission control unit configured to:periodically generate a signal having a waveform at a first frequency for each period, wherein the first frequency is different from a preset resonant frequency between the wireless power transmitter and the receiver; measure a variation of an attenuation factor of the generated signal for the each period; detect a second frequency included in the generated signal, wherein the second frequency is different from each of the first frequency and the preset resonant frequency, and wherein the second frequency is related to a mutual inductance value between the wireless power transmitter and the receiver; determine a type of an external material corresponding to the receiver and an alignment state between the wireless power transmitter and the receiver based on the measured variation of the attenuation factor and the detected second frequency; and transmit power to the receiver in the wireless manner based on the determined type of the external material and alignment state. 2. The wireless power transmitter of claim 1 , wherein the power transmission control unit determines the external material as the receiver that receives power in the wireless manner to transmit power to the receiver in a wireless manner when the variation of the attenuation factor corresponds to a preset reference variation. 3. The wireless power transmitter of claim 2 , further comprising:a wireless communication unit formed to perform communication with the receiver in a wireless manner, wherein the power transmission control unit transmits a preset amount of power and control information associated with communication to the receiver to perform communication through the wireless communication unit when the external material is a receiver that is capable of receiving the wireless power. 4. The wireless power transmitter of claim 3 , wherein the power transmission control unit transmits power to the receiver in a wireless manner when one-to-one communication with the receiver is completed. 5. The wireless power transmitter of claim 4 , wherein the power transmission control unit receives amount-of-power information on wireless power to be received from the receiver through the connected communication to control the power supply unit so as to supply power based on the amount-of-power information. 6. The wireless power transmitter of claim 1 , wherein the power transmission control unit detects a capacitance of the external material based on the measured variation of the attenuation factor. 7. A wireless charging system, comprising:a transmitter formed to transmit power in a wireless manner; and a receiver formed to receive wireless power from the transmitter, wherein the transmitter comprises: a power supply unit configured to supply power to transmit power to the receiver in a wireless manner; and a power transmission control unit configured to:periodically generate a signal having a waveform at a first frequency for each period, wherein the first frequency is different from a preset resonant frequency between the transmitter and the receiver; measure a variation of an attenuation factor of the generated signal for the each period; detect a second frequency included in the generated signal, wherein the second frequency is different from each of the first frequency and the preset resonant frequency, and wherein the second frequency is related to a mutual inductance value between the transmitter and the receiver; determine a type of an external material corresponding to the receiver and an alignment state between the transmitter and the receiver based on the measured variation of the attenuation factor and the detected second frequency; and transmit power to the receiver in the wireless manner based on the determined type of the external material and alignment state. 8. The wireless charging system of claim 7 , wherein:the transmitter further comprises a wireless communication unit formed to perform communication with the receiver in a wireless manner; and the power transmission control unit transmits communication information and a preset amount of power to the receiver to perform communication with the receiver in a wireless manner prior to transmitting power to the receiver in a wireless manner. 9. The wireless charging system of claim 8 , wherein the power transmission control unit transmits the communication information and preset amount of power using a frequency higher than a resonant frequency of the transmitter. 10. The wireless charging system of claim 8 , wherein when communication is connected to the receiver based on the communication information, the power transmission control unit controls the power supply unit to transmit power based on an amount of power received from the receiver through the communication. 11. The wireless charging system of claim 10 , wherein when a request signal for suspending power transmission is received from the receiver, the power transmission control unit controls the power supply unit to suspend the power being transmitted. 12. The wireless charging system of claim 11 , wherein the receiver generates the request signal based on at least one of a voltage value, a voltage drop time, or a current value of the receiver. 13. A wireless power transmission method of a wireless power transmitter for transmitting power in a wireless manner, the wireless power transmission method comprising:periodically generating a signal having waveform at a first frequency, wherein the first frequency is different from a preset resonant frequency between the wireless power transmitter and the receiver; measuring a variation of an attenuation factor of the generated signal for the each period; detecting a second frequency included in the generated signal, wherein the second frequency is different from each of the first frequency and the preset resonant frequency, and wherein the second frequency is related to a mutual inductance value between the wireless power transmitter and the receiver; determining a type of an external material corresponding to the receiver and an alignment state between the wireless power transmitter and the receiver based on the measured variation of the attenuation factor and the detected second frequency; and transmitting power to the receiver in the wireless manner based on the determined type of the external material and alignment state. 14. The wireless power transmission method of claim 13 , wherein said transmitting power to the receiver in a wireless manner suspends the transmission of the power based on a request signal for suspending the transmission of power that is received from the receiver through the communication.
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