Method for determining an execution frequency of a foreign object detection method
地域：
Espoo
摘要
The invention relates to a method, comprising: determining a power level value of transmitted wireless energy, and adjusting a foreign object detection method frequency on the basis of said power level value of the transmitted wireless energy. The invention further relates to an apparatus and a computer program product that perform the method.
說明書
This application was originally filed as PCT Application No. PCT/FI2015/050319 filed May 12, 2015 which claims priority benefit from Finnish Patent Application No. 20145560, filed Jun. 13, 2014.
A method for determining an execution frequency of a foreign object detection method.
Electromagnetic induction has been known for a long time and it has been used in many applications. In electromagnetic induction a time-varying magnetic flux induces an electromotive force to a closed conductor loop. Vice versa, a time-varying current creates a varying magnetic flux. In transformers, this phenomenon is utilized to transfer energy wirelessly from a circuit to another via inductively coupled coils. A primary coil transforms an alternating current into a varying magnetic flux, which is arranged to flow through the secondary coil. The varying magnetic flux then induces an alternating voltage over the secondary coil.
權(quán)利要求
The invention claimed is:1. A method, comprising:determining a power level value of transmitted wireless energy; and based on an increase of the power level value of the transmitted wireless energy, shortening a time interval between adjacent executions of a foreign object detection method, wherein the shortening the time interval includes increasing a frequency of the foreign object detection method as a function of said power level value of the transmitted wireless energy. 2. The method according to claim 1 , wherein the frequency of the foreign object detection method is increased exponentially or progressively. 3. The method according to claim 1 , further comprising:performing a second determination of the power level value; and based on a decrease of the power level value detected based on the second determination, increasing the time interval between the adjacent executions of the foreign object detection method. 4. The method according to claim 1 , wherein said power level value of the transmitted wireless energy is derived from a second power level value received from a wireless energy receiver. 5. An apparatus comprising at least one processor, memory including computer program code, the memory and the computer program code configured to, with the at least one processor, cause the apparatus to:determine a power level value of transmitted wireless energy; and based on an increase of the power level value of the transmitted wireless energy, shorten a time interval between adjacent executions of a foreign object detection method on a basis of said power level value of the transmitted wireless energy and increase a frequency of the foreign object detection method as a function of said power level value of the transmitted wireless energy. 6. The apparatus according to claim 5 , wherein the frequency of the foreign object detection method is increased linearly or progressively. 7. The apparatus according to claim 5 , wherein the memory and the computer program code configured to, with the at least one processor, further cause the apparatus to:based on a decrease of the power level value of the transmitted wireless energy, increase the time interval between the adjacent executions of the foreign object detection method. 8. The apparatus according to claim 5 , wherein said power level value of the transmitted wireless energy is derived from a second power level value received from a wireless energy receiver. 9. A computer program product embodied on a non-transitory computer readable medium, comprising computer program code configured to, when executed on at least one processor, cause an apparatus to:determine a power level value of transmitted wireless energy; and based on an increase of the power level value of the transmitted wireless energy, shorten a time interval between adjacent executions of a foreign object detection method on a basis of said power level value of the transmitted wireless energy and increase a frequency of the foreign object detection method as a function of said power level value of the transmitted wireless energy. 10. The computer program product according to claim 9 , wherein the frequency of the foreign object detection method grows linearly or exponentially. 11. The computer program product according to claim 9 , wherein the computer program code configured to, when executed on the at least one processor, further causes the apparatus to:based on a decrease of the power level value of the transmitted wireless energy, increase the time interval between the adjacent executions of the foreign object detection method. 12. The computer program product according to claim 9 , wherein said power level value of the transmitted wireless energy is derived from a second power level value received from a wireless energy receiver. 13. The method according to claim 1 , wherein the frequency of the foreign object detection method is increased linearly. 14. The apparatus according to claim 5 , wherein the frequency of the foreign object detection method is increased exponentially. 15. The computer program product according to claim 9 , wherein the frequency of the foreign object detection method grows progressively.
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