KR-102961467-B1 - method for detecting foreign object and electronic device

Abstract

An electronic device capable of transmitting and receiving wireless power includes a wireless power transfer (WPT) coil; a sensor coil surrounding the WPT coil; and a processor operatively connected to the WPT coil and the sensor coil. The processor controls the transmission and reception of power using the WPT coil, performs a ping operation using the sensor coil, controls the measurement of a waveform of current or voltage of the sensor coil during or after the ping operation of the sensor coil, controls the verification of the Q factor of the sensor coil based on the measured waveform, verifies the presence of a foreign object based on the verified Q factor, and controls power transmission using the WPT coil based on the result of verifying the presence of the foreign object.

Inventors

• 박세호

Assignees

• 삼성전자 주식회사

Dates

Publication Date

20260507

Application Date

20210701

Priority Date

20201023

Claims (20)

1. In an electronic device capable of transmitting and receiving wireless power, WPT (wireless power transfer) coil; A sensor coil surrounding the above WPT coil, having a resonant frequency higher than the resonant frequency of the above WPT coil and a bandwidth of the resonant frequency narrower than the bandwidth of the resonant frequency of the above WPT coil; and It includes a processor operatively connected to the above WPT coil and the above sensor coil, and The above processor Controls the transmission and reception of power using the above WPT coil, and A ping operation is performed using the above sensor coil, and Controls the measurement of the current or voltage waveform of the sensor coil during or after performing a ping operation of the sensor coil, and Control to check the Q factor of the sensor coil based on the measured waveform above, and Based on the Q factor confirmed above, the presence of a foreign object is confirmed, and An electronic device that controls power transmission using the WPT coil based on the result of confirming the presence of the above foreign substance.
2. In Article 1, The above processor An electronic device that controls power transmission using the above WPT coil to continue if there is no foreign matter.
3. In Article 1, The above processor An electronic device that controls the sensor coil to interrupt the current being input to the sensor coil and applies a resonant frequency current to the sensor coil to perform a ping operation.
4. In Article 1, The above processor An electronic device that controls the measurement of a damping curve for a resonant frequency current applied to the sensor coil or a voltage envelope of the sensor coil.
5. In Article 1, The above processor An electronic device that determines the presence of foreign matter based on the threshold value of the Q factor of the sensor coil and the confirmed Q factor of the sensor coil.
6. In Paragraph 5, The above processor If the value of the Q factor of the sensor coil confirmed is smaller than the threshold value of the Q factor of the sensor coil, it is determined that there is foreign matter. An electronic device that determines that there is no foreign matter if the value of the Q factor of the sensor coil is greater than the threshold value of the Q factor of the sensor coil.
7. In Article 1, The above processor An electronic device that performs a ping operation using the sensor coil above periodically or once.
8. In Article 1, The above processor An electronic device that transmits a power interruption message using the WPT coil or the sensor coil when foreign matter is present.
9. In Article 1, The above processor An electronic device that controls the measurement of the current or voltage waveform of the sensor coil in response to the power transmission operation of an external electronic device.
10. In Article 1, The above processor An electronic device that transmits a power reception message or a power transmission message using the above WPT coil or the above sensor coil.
11. A method for detecting foreign matter using a sensor coil of an electronic device capable of transmitting and receiving wireless power, comprising a WPT (wireless power transfer) coil and a sensor coil surrounding the WPT coil, the sensor coil having a resonant frequency higher than the resonant frequency of the WPT coil and a bandwidth of resonant frequency narrower than the bandwidth of the resonant frequency of the WPT coil. Operation of controlling the transmission and reception of power using the above WPT coil; An operation to perform a ping operation using the above sensor coil; An operation to control the measurement of the waveform of the current or voltage of the sensor coil during or after performing a ping operation of the sensor coil; An operation to control the Q factor of the sensor coil based on the measured waveform; An operation to confirm the presence of a foreign object based on the above-determined Q factor; and A method comprising controlling power transmission using the WPT coil based on the result of confirming the presence of the above foreign substance.
12. In Paragraph 11, A method further comprising an operation to control power transmission using the above WPT coil to continue if there is no foreign matter.
13. In Paragraph 11, The operation that performs the above ping operation is A method further comprising the operation of interrupting the current being input to the sensor coil and controlling the sensor coil to perform a ping operation by applying a resonant frequency current to the sensor coil.
14. In Paragraph 11, The operation of controlling the measurement of the current or voltage waveform of the sensor coil is A method further comprising controlling to measure the damping curve for the resonant frequency current applied to the sensor coil or the voltage envelope of the sensor coil.
15. In Paragraph 11, The operation of confirming the presence of the above foreign object is A method further comprising the operation of determining the presence of foreign matter based on the threshold value of the Q factor of the sensor coil and the confirmed Q factor of the sensor coil.
16. In Paragraph 15, The operation of confirming the presence of the above foreign object is An operation to determine that there is foreign matter if the value of the Q factor of the sensor coil confirmed is smaller than the threshold value of the Q factor of the sensor coil; and A method further comprising the operation of determining that there is no foreign matter if the value of the Q factor of the sensor coil confirmed is greater than the threshold value of the Q factor of the sensor coil.
17. In Paragraph 11, The operation that performs the above ping operation is A method further comprising an operation to perform a ping operation using the sensor coil above periodically or once.
18. In Paragraph 11, A method further comprising a method of transmitting a power interruption message using the WPT coil or the sensor coil when there is foreign matter.
19. In Paragraph 11, A method further comprising controlling to measure the waveform of the current or voltage of the sensor coil in response to the power transmission operation of an external electronic device.
20. In Paragraph 11, A method further comprising the operation of transmitting a power reception message or a power transmission message using the above WPT coil or the above sensor coil.

Description

Method for detecting foreign object using a sensor coil and electronic device Various embodiments of the present invention relate to a method for detecting foreign matter using a sensor coil and an electronic device including the method. Electronic devices can be wirelessly charged or contactless charged using wireless power transfer technology. Wireless power transfer technology may be a technology in which power is wirelessly transferred from a power transmitting device to a power receiving device without a connection via a separate connector between the power receiving device and the power transmitting device, thereby charging the battery of the power receiving device. Wireless power transfer technology may include magnetic induction and magnetic resonance methods, and may also include various other types of wireless power transfer technology. In relation to the description of the drawings, the same or similar reference numerals may be used for identical or similar components. FIG. 1 is a block diagram of an electronic device in a network environment according to various embodiments. FIG. 2 is a block diagram of a wireless communication module, a power management module, and an antenna module of an electronic device according to various embodiments. FIG. 3 is a block diagram of a power management module and a battery according to various embodiments. FIG. 4a is a diagram illustrating a wireless charging operation between an electronic device and a first external electronic device according to various embodiments of the present invention. FIG. 4b is a diagram illustrating wireless charging operation between electronic devices according to various embodiments of the present invention. FIG. 4c is a diagram illustrating a wireless charging operation between an electronic device and a second external electronic device according to various embodiments of the present invention. FIG. 5a is a block diagram schematically illustrating a first electronic device according to various embodiments of the present invention. FIG. 5b is a block diagram schematically illustrating a second electronic device according to various embodiments of the present invention. FIG. 6a is a drawing showing a coil included in an electronic device, a first external electronic device and/or a second external electronic device according to various embodiments of the present invention. FIG. 6b is a drawing showing a coil included in an electronic device, a first external electronic device and/or a second external electronic device according to various embodiments of the present invention. FIG. 7 is a diagram showing an equivalent circuit of a coil according to various embodiments of the present invention. FIG. 8a is a graph showing the Q factor of a coil when there is no foreign matter in a wireless charging operation according to various embodiments of the present invention. FIG. 8b is a graph showing the Q factor (Quality Factor, Q factor) of a coil when there is foreign matter in a wireless charging operation according to various embodiments of the present invention. FIG. 9 is a flowchart illustrating a method for detecting foreign objects using a sensor coil between an electronic device and an external electronic device according to various embodiments of the present invention. FIG. 10 is a flowchart illustrating a method for detecting foreign matter using a first sensor coil of an electronic device according to various embodiments of the present invention. FIG. 11 is a flowchart illustrating a method for detecting foreign matter using a second sensor coil of an external electronic device according to various embodiments of the present invention. FIG. 12 is a flowchart illustrating a method for detecting foreign objects using a sensor coil between an electronic device and an external electronic device according to various embodiments of the present invention. FIG. 13 is a flowchart illustrating a method for detecting foreign matter using a first sensor coil of an electronic device according to various embodiments of the present invention. FIG. 14 is a flowchart illustrating a method for detecting foreign matter using a second sensor coil of an external electronic device according to various embodiments of the present invention. FIG. 15 is a flowchart illustrating a method for detecting foreign objects using a sensor coil between an electronic device and an external electronic device according to various embodiments of the present invention. FIG. 16 is a flowchart illustrating a method for detecting foreign matter using a first sensor coil of an electronic device according to various embodiments of the present invention. FIG. 17 is a flowchart illustrating a method for detecting foreign matter using a second sensor coil of an external electronic device according to various embodiments of the present invention. FIG. 18 is a flowchart illustrating a method for detecting foreign objects using a sensor coil between an electronic device and an