KR-102961463-B1 - method for detecting foreign object and electronic device

KR102961463B1KR 102961463 B1KR102961463 B1KR 102961463B1KR-102961463-B1

Abstract

An electronic device capable of transmitting and receiving wireless power according to the present disclosure comprises a wireless power transfer (WPT) coil and a processor operatively connected to the WPT coil, wherein the processor controls the transmission of a first ping signal to an external object through the WPT coil, checks a waveform of current or voltage measured during or after the transmission of the first ping signal, obtains a Q factor based on the checked waveform, and if the obtained Q factor is less than a predetermined Q factor, determines that the external object is a foreign object or contains a foreign object and is located at the center of the WPT coil and controls the power transmission operation, wherein if the obtained Q factor is greater than or equal to the predetermined Q factor, transmits a second ping signal to the external object through the WPT coil, checks a waveform of current or voltage during or after the transmission of the second ping signal, checks an inductance measured at both ends of the WPT coil based on the checked waveform, and, based on the measured inductance, determines that the external object is a foreign object or contains a foreign object Power transmission operation can be controlled by including and determining that it is located around the WPT coil.

Inventors

정형구
김동조
하민철
김유수
김기현
노윤정
손계익
유태현
이경민

Assignees

삼성전자 주식회사

Dates

Publication Date: 20260508
Application Date: 20220314
Priority Date: 20211207

Claims (20)

In an electronic device capable of transmitting and receiving wireless power, WPT (wireless power transfer) coil; and It includes a processor operatively connected to the above WPT coil, The above processor Controls the transmission of the first ping signal to an external object through the WPT coil, and Check the waveform of the current or voltage measured during or after the transmission of the first ping signal, and Based on the waveform confirmed above, obtain the Q factor, and If the above-mentioned acquired Q factor is less than the predetermined Q factor, it is determined that the above-mentioned external object is a foreign object or contains a foreign object and is located at the center of the WPT coil, and the power transmission operation is controlled. If the above-mentioned acquired Q factor is greater than or equal to the above-mentioned predetermined Q factor, a second ping signal is transmitted to the external object through the WPT coil, and Check the waveform of the current or voltage during or after the transmission of the second ping signal, and Based on the waveform confirmed above, check the inductance measured at both ends of the WPT coil, and An electronic device that controls power transmission operation by determining, based on the above-mentioned measured inductance, that the external object is a foreign substance or contains a foreign substance and is located around the WPT coil.
In Article 1, The above processor An electronic device that, if the measured inductance is greater than or equal to a predetermined inductance, determines that the external object is not a foreign substance or does not contain a foreign substance and controls the power transmission operation to maintain.
In Article 1, The above second ping signal is An electronic device having a higher frequency band than the first ping signal mentioned above.
In Article 1, The above processor If the above-mentioned obtained Q factor is greater than or equal to the above-mentioned determined Q factor, it is presumed that the above-mentioned external object is located around the WPT coil, and Based on the second ping signal above, the first inductance measured at both ends of the WPT coil is measured, and An electronic device that controls the power transmission operation by determining that the external object contains foreign matter or that the external object is foreign matter and is located around the WPT coil if the measured first inductance is less than the first predetermined inductance.
In Article 1, The above processor If the above-mentioned obtained Q factor is less than the above-mentioned determined Q factor, An electronic device that controls the power transmission operation by determining that the above external object contains foreign matter, or that the above external object is foreign matter and is located at the center of the WPT coil.
In Article 1, The above processor If it is determined that the power loss exceeds a predetermined value during power transmission operation with an external electronic device, a ping step is performed, and While performing the above ping step, maintaining the display of the user interface regarding charging, An electronic device that controls the high-speed charging operation into a normal charging operation when the above power transmission operation is a high-speed charging operation.
In an electronic device capable of transmitting and receiving wireless power, WPT (wireless power transfer) coil; and It includes a processor operatively connected to the above WPT coil, The above processor Transmits the first ping signal to an external object through the WPT coil, and Checking the current or voltage waveform during or after the transmission of the first ping signal, Based on the waveform confirmed above, obtain the Q factor, and Based on the waveform confirmed above, the inductance is measured at both ends of the WPT coil, and An electronic device that controls power transmission operation by determining that the external object is a foreign substance or contains a foreign substance and is located around the WPT coil if the above-mentioned confirmed Q factor is greater than or equal to a predetermined Q factor and the above-mentioned measured inductance is less than a predetermined inductance.
In Article 7, The above processor An electronic device that controls power transmission operation by determining that the external object is not a foreign substance or does not contain a foreign substance, and determining that it is located around the WPT coil, if the above-mentioned confirmed Q factor is greater than or equal to a predetermined Q factor and the above-mentioned measured inductance is greater than or equal to a predetermined inductance.
In Article 7, The above processor An electronic device that controls power transmission operation by determining that the external object is a foreign substance or contains a foreign substance and is located at the center of the WPT coil when the above-mentioned confirmed Q factor is less than a predetermined Q factor.
In Article 7, The above processor An electronic device that controls power transmission operation by determining that the external object is a foreign substance or contains a foreign substance and is located around the WPT coil when the measured inductance is less than a predetermined inductance.
A method for detecting foreign substances in an electronic device capable of transmitting and receiving wireless power using a WPT (wireless power transfer) coil, The operation of transmitting a first ping signal to an external object through the WPT coil; An operation to verify the waveform of the current or voltage measured during or after the transmission of the first ping signal; Operation of obtaining a Q factor based on the waveform confirmed above; If the above-mentioned acquired Q factor is less than a predetermined Q factor, the operation of controlling the power transmission operation by determining that the above-mentioned external object is a foreign object or contains a foreign object and is located at the center of the WPT coil; If the above-mentioned acquired Q factor is greater than or equal to the above-mentioned predetermined Q factor, the operation of transmitting a second ping signal to the external object through the WPT coil; An operation to check the waveform of current or voltage during or after the transmission of the second ping signal; An operation to verify the inductance measured at both ends of the WPT coil based on the waveform verified above; and A method comprising controlling a power transmission operation by determining, based on the measured inductance, that the external object is a foreign substance or contains a foreign substance and is located around the WPT coil.
In Article 11, A method comprising controlling to maintain power transmission operation by determining that the external object is not a foreign substance or does not contain a foreign substance if the measured inductance is greater than or equal to a predetermined inductance.
In Paragraph 11, The above second ping signal is A method with a higher frequency band than the first ping signal above.
In Paragraph 11, An operation to determine that the external object is located around the WPT coil if the above-mentioned acquired Q factor is greater than or equal to the above-mentioned predetermined Q factor; The operation of measuring a first inductance measured at both ends of the WPT coil based on the second ping signal; and A method comprising controlling the power transmission operation by determining that if the measured first inductance is less than the first predetermined inductance, the external object contains foreign matter or the external object is foreign matter and is located around the WPT coil.
In Paragraph 11, If the above-mentioned acquired Q factor is less than the above-mentioned predetermined Q factor, the operation of determining that the external object is located at the center of the WPT coil; The operation of measuring a second inductance measured at both ends of the WPT coil based on the first ping signal; and A method comprising controlling the power transmission operation by determining that if the measured second inductance is less than the second predetermined inductance, the external object contains foreign matter or the external object is foreign matter and is located at the center of the WPT coil.
In Paragraph 11, An operation to perform a ping step if it is determined that power loss exceeds a predetermined value during power transmission operation with an external electronic device; The operation of maintaining a user interface display regarding charging while performing the above ping step; and A method comprising controlling the high-speed charging operation to a normal charging operation when the above power transmission operation is a high-speed charging operation.
A method for detecting foreign substances in an electronic device capable of transmitting and receiving wireless power using a WPT (wireless power transfer) coil, The operation of transmitting a first ping signal to an external object through the WPT coil; An operation to check a current or voltage waveform during or after the transmission of the first ping signal; Operation of obtaining a Q factor based on the waveform confirmed above; The operation of measuring inductance at both ends of the WPT coil based on the waveform confirmed above; and A method comprising controlling a power transmission operation by determining that the external object is a foreign substance or contains a foreign substance and is located around the WPT coil when the above-mentioned confirmed Q factor is greater than or equal to a predetermined Q factor and the above-mentioned measured inductance is less than a predetermined inductance.
In Paragraph 17, A method comprising controlling a power transmission operation by determining that the external object is not a foreign substance or does not contain a foreign substance, and determining that it is located around the WPT coil, if the above-mentioned confirmed Q factor is greater than or equal to a predetermined Q factor and the above-mentioned measured inductance is greater than or equal to a predetermined inductance.
In Paragraph 17, A method comprising controlling a power transmission operation by determining that if the above-mentioned confirmed Q factor is less than a predetermined Q factor, the above-mentioned external object is a foreign substance or contains a foreign substance and is located at the center of the WPT coil.
In Paragraph 19, A method comprising controlling a power transmission operation by determining that the external object is a foreign substance or contains a foreign substance and is located around the WPT coil if the above-mentioned confirmed Q factor is less than the above-mentioned determined Q factor and the above-mentioned measured inductance is less than the above-mentioned inductance.

Description

Method for detecting foreign object and electronic device Various embodiments of the present disclosure relate to a foreign substance detection method and an electronic device. 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. When electronic devices transmit and receive power wirelessly, safety accidents may occur due to foreign objects that interfere with power transmission. However, since the method of detecting foreign objects is determined by the electronic device transmitting external power, there is a problem in that safety varies depending on the performance of the electronic device transmitting wireless power. 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 of the present invention. FIG. 2 is a diagram schematically illustrating the operation of a power receiving device and a power transmitting device transmitting and receiving power according to one embodiment of the present disclosure. FIG. 3a is a block diagram schematically showing a power receiving device according to one embodiment of the present disclosure. FIG. 3b is a block diagram schematically showing a power transmission device according to one embodiment of the present disclosure. FIG. 4a is a diagram illustrating a wireless charging operation between a power receiving device and a power transmitting device according to one embodiment of the present disclosure. FIG. 4b is a diagram illustrating a wireless charging operation between a power receiving device and a power transmitting device according to one embodiment of the present disclosure. FIG. 4c is a diagram illustrating a wireless charging operation between a power receiving device and a power transmitting device according to one embodiment of the present disclosure. FIGS. 5A and 5B are flowcharts illustrating a method for detecting a foreign object in an electronic device according to one embodiment of the present disclosure. FIGS. 6a and 6b are flowcharts illustrating a method for detecting foreign substances in an electronic device according to one embodiment of the present disclosure. FIGS. 7a and 7b are flowcharts illustrating a method for detecting foreign substances in an electronic device according to one embodiment of the present disclosure. FIG. 8 is a flowchart illustrating a method for detecting foreign substances in an electronic device according to various embodiments of the present disclosure. FIGS. 9a to 9c are drawings showing the positions between coils and the positions of foreign substances according to various embodiments of the present disclosure. FIG. 10 is a graph showing the Q factor measured according to the presence and location of foreign substances according to various embodiments of the present disclosure. FIG. 11 is a graph showing the combined inductance measured according to the presence and location of foreign substances in various embodiments of the present disclosure. FIG. 12 is a graph showing the combined inductance measured according to the presence and location of foreign substances in various embodiments of the present disclosure. FIG. 1 is a block diagram of an electronic device (101) in a network environment (100) according to various embodiments. Referring to FIG. 1, in a network environment (100), an electronic device (101) may communicate with an electronic device (102) through a first network (198) (e.g., a short-range wireless communication network) or with at least one of an electronic device (104) or a server (108) through a second network (199) (e.g., a long-range wireless communication network). According to one embodiment, the electronic device (101) may communicate with the electronic device (104) through a server (108). According to one embodiment, the electronic device (101) may include a processor (120), memory (130), input module (150), sound output module (155), display module (160), audio module (170), sensor module (176), interface (177), connection terminal (178), haptic module (179), camera module (180), power management module (188), battery (189), communication module (190), subscriber identification module (196), or antenna module (197). In some embodiments, at least one of these components (e.g., connection terminal (178)) may be omitted from the electronic devic