KR-102961469-B1 - method for detecting foreign object and electronic device

KR102961469B1KR 102961469 B1KR102961469 B1KR 102961469B1KR-102961469-B1

Abstract

The electronic device includes a battery, a WPT (wireless power transfer) coil, a wireless power transmission/reception circuit electrically connected to the WPT coil and wirelessly receiving power from an external electronic device or wirelessly transmitting power to the outside, a charging circuit electrically connected to the wireless power transmission/reception circuit and the battery, and a processor electrically connected to the wireless power transmission/reception circuit and the charging circuit. When the wireless power transmission/reception circuit is in a receiving mode, the processor controls the charging circuit to supply power from the battery to the wireless power transmission/reception circuit when the receiving voltage generated by the first detecting power received from the external electronic device exceeds a predetermined voltage, controls the output of foreign substance detection power through the WPT coil based on the supplied power, controls the detection of electrical changes caused by the foreign substance detection power, and can confirm the occurrence of an error when a foreign substance is detected based on the electrical change.

Inventors

송민기
박경민
오창학

Assignees

삼성전자 주식회사

Dates

Publication Date: 20260507
Application Date: 20210813

Claims (20)

In electronic devices, battery; WPT (wireless power transfer) coil; A wireless power transmission and reception circuit electrically connected to the above WPT coil and wirelessly receiving power from an external electronic device or wirelessly transmitting power to the outside; The above wireless power transmission and reception circuit and the charging circuit electrically connected to the battery; and It includes a processor electrically connected to the above wireless power transmission and reception circuit and the above charging circuit, and The above processor Control to receive a first detecting power from an external electronic device through the WPT coil, and When the wireless power transmission and reception circuit is in reception mode, it determines whether the reception voltage generated by the first sensed power exceeds a predetermined voltage, and Based on the fact that the received voltage exceeds the predetermined voltage, the charging circuit is controlled to supply power from the battery to the wireless power transmission and reception circuit, and Based on the power supplied above, the foreign substance detection power is controlled to be output through the WPT coil, and Determining the occurrence of an error based on detecting electrical changes caused by the foreign substance detection power resulting from the presence of a foreign substance, and Based on the electrical change of the foreign substance detection power, the electronic device controls the reception of the second detection power received after transmitting the foreign substance detection power, through the WPT coil, from the external electronic device.
In Article 1, It further includes a voltage conversion circuit, The above processor When the received voltage generated by the first detection power received from the above external electronic device exceeds a predetermined voltage, the charging circuit or the voltage conversion circuit is controlled to supply power from the battery to the wireless power transmission and reception circuit to generate the foreign substance detection power. An electronic device that controls the output of foreign substance detection power through the WPT coil when the received voltage is lower than a predefined voltage level.
In Article 1, The above processor An electronic device that controls the transmission of a packet to an external electronic device based on the second sensing power received from the external electronic device through the WPT coil.
In Paragraph 3, The above processor An electronic device that controls operation to a charging mode based on receiving power from the above-mentioned external electronic device.
In Article 1, The above processor An electronic device that controls the wireless power transmission and reception circuit to operate in a standby state when the receiving voltage generated by the first sensing power received from the above external electronic device is less than or equal to the above predetermined voltage.
In Article 1, The above processor An electronic device that measures a change in voltage, current, and/or power caused by electromagnetic induction on a wireless power transmission and reception path while transmitting the foreign substance detection power through the WPT coil, or measures a damping waveform and damping coefficient, and determines that there is a foreign substance on the wireless power transmission and reception path if the measured change in voltage, current, and/or power or the measured damping waveform and damping coefficient is greater than or less than a specified value.
In Article 1, Display module; Sound output module; or It further includes at least one haptic module and The above processor An electronic device that outputs a visual, auditory, or tactile notification regarding the presence of foreign matter when the occurrence of the above error is confirmed.
In Article 1, The above processor An electronic device that does not transmit a packet to the external electronic device when the occurrence of the above error is confirmed.
In Article 1, The above processor An electronic device that controls the reception of wireless power at a power level lower than a predetermined power level when the occurrence of the above error is confirmed.
In Article 1, The above processor An electronic device that, upon confirmation of the occurrence of the above error, determines whether to maintain wireless power reception from the external electronic device or changes the level of the received power based on the charge state information of the battery reported by the power management module.
In a method for detecting foreign substances in an electronic device that transmits and receives wireless power, Operation of receiving first detecting power received from an external electronic device through a WPT coil; An operation to determine whether the receiving voltage generated by the first sensed power exceeds a predetermined voltage when the wireless power transmission and reception circuit is in receiving mode; An operation to control the charging circuit to supply power from the battery to the wireless power transmission and reception circuit based on the fact that the received voltage exceeds the predetermined voltage; An operation to control the output of foreign substance detection power through the WPT coil based on the supplied power; An operation to determine the occurrence of an error based on detecting an electrical change caused by the foreign substance detection power generated due to the presence of a foreign substance; and A method comprising controlling to receive a second detection power, which is received after transmitting the foreign substance detection power, from the external electronic device through the WPT coil, based on the fact that the foreign substance is not detected based on the electrical change of the foreign substance detection power.
In Paragraph 11, An operation to control the charging circuit or voltage conversion circuit to supply power from the battery to the wireless power transmission and reception circuit to generate the foreign substance detection power when the receiving voltage generated by the first detection power received from the external electronic device exceeds a predetermined voltage; and A method comprising controlling the output of the foreign substance detection power through the WPT coil when the received voltage is lower than a predefined voltage level.
In Paragraph 11, A method further comprising the operation of transmitting a packet to an external electronic device based on receiving a second sensed power from the external electronic device through the WPT coil.
In Paragraph 13, A method further comprising an operation to perform a charging mode based on receiving power from the above external electronic device.
In Paragraph 11, A method further comprising the operation of performing the wireless power transmission and reception circuit in a standby state when the receiving voltage generated by the first sensing power received from the external electronic device is less than or equal to the predetermined voltage.
In Paragraph 11, The operation of controlling to detect electrical changes caused by the above foreign substance detection power is A method further comprising the operation of measuring a change value of voltage, current, and/or power occurring due to electromagnetic induction on a wireless power transmission and reception path while transmitting the foreign substance detection power through the WPT coil, or measuring an attenuation waveform and attenuation coefficient, and determining that there is a foreign substance on the wireless power transmission and reception path if the measured change value of voltage, current, and/or power or the measured attenuation waveform and attenuation coefficient is greater than or less than a specified value.
In Paragraph 11, The operation of confirming the occurrence of an error when a foreign substance is detected based on the above electrical change is A method of outputting a visual, auditory, or tactile notification regarding the presence of foreign matter.
In Paragraph 11, The operation of confirming the occurrence of an error when a foreign substance is detected based on the above electrical change is A method including an operation of not transmitting a packet to the above external electronic device.
In Paragraph 11, The operation of confirming the occurrence of an error when a foreign substance is detected based on the above electrical change is A method including the operation of receiving wireless power at a power lower than a predetermined power level.
In Paragraph 11, The operation of confirming the occurrence of an error when a foreign substance is detected based on the above electrical change is A method further comprising determining whether to maintain a wireless power reception operation from an external electronic device or changing the level of the received power based on the charge state information of the battery reported by the power management module.

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. 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 block diagram of a wireless communication module, a power management module, and an antenna module of an electronic device according to various embodiments of the present invention. FIG. 3 is a block diagram of a power management module and a battery according to various embodiments of the present invention. FIG. 4a is a diagram showing a wireless charging operation between an electronic device and a first external electronic device according to one embodiment of the present invention. FIG. 4b is a diagram showing wireless charging operation between electronic devices according to one embodiment of the present invention. FIG. 4c is a diagram showing a wireless charging operation between an electronic device and a second external electronic device according to one embodiment of the present invention. FIG. 5 is a diagram showing a wireless power transmission and reception circuit of an electronic device according to one embodiment of the present invention. FIG. 6 is a block diagram showing the configuration of an electronic device according to one embodiment of the present invention. FIG. 7 is a block diagram showing the configuration of an electronic device according to one embodiment of the present invention. FIG. 8a is a flowchart illustrating a method for detecting foreign substances in an electronic device according to various embodiments of the present invention. FIG. 8b is a flowchart illustrating a method for detecting foreign substances in an electronic device according to various embodiments of the present invention. FIG. 9 is a graph showing a method for measuring a damped waveform after an electronic device according to one embodiment of the present invention transmits a detecting ping to an external electronic device. FIG. 10 is a graph showing the sensing ping transmission and charging operation of an electronic device according to one embodiment of the present invention. 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 device (101), or one or more other components may be added. In some embodiments, some of these components (e.g., sensor module (176), camera module (180), or antenna module (197)) may be integrated into a single component (e.g., display module (160)). The processor (120) can control at least one other component (e.g., a hardware or software component) of the electronic device (101) connected to the processor (120) by executing software (e.g., a program (140)), and can perform various data processing or operations. According to one embodiment, as at least part of the data processing or operations, the processor (120) can store commands or data received from other components (e.g., a sensor module (176) or a communication module (190)) in volatile memory (132), process the commands or data stored in volatile memory (13