CN117337531A

CN117337531A - Coil for detecting foreign matter and wireless power transmitter including the same

Info

Publication number: CN117337531A
Application number: CN202280036162.3A
Authority: CN
Inventors: 崔镇守; 崔辅焕; 朴成范; 柳荣浩; 李卿敏; 李相旭
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2021-05-21
Filing date: 2022-04-07
Publication date: 2024-01-02

Abstract

The detection coil includes a first sub-coil disposed on the first PCB, and the first sub-coil includes a first portion and a second portion disposed under the first portion, one end of the second portion being connected to one end of the first portion and wound in a direction opposite to a direction in which the first portion is wound. The detection coil is disposed on the second PCB and includes a third portion and a fourth portion disposed below the third portion. One end of the fourth portion is connected to one end of the third portion, and includes a fourth portion wound in a direction opposite to a winding direction of the third portion. The first portion and the second portion have a polygonal shape and are symmetrical to each other. The third portion and the fourth portion have a polygonal shape and are symmetrical to each other. The first sub-coil and the second sub-coil are arranged such that a portion of each overlaps.

Description

Coil for detecting foreign matter and wireless power transmitter including the same

Technical Field

Various embodiments of the present disclosure relate to a coil for detecting foreign matter and a wireless power transmitter including the same.

Background

With recent development of wireless charging technology, methods of charging various electronic devices by supplying power with a single charging device have been studied.

Such wireless charging technology provides a system using wireless power transmission/reception such that, for example, an electronic device is simply placed on a charging pad without connecting it to a separate charging connector, thereby automatically charging a battery of the electronic device.

Such wireless charging techniques are classified into an electromagnetic induction type using a coil, a resonance type using resonance, and an RF/microwave radiation type in which electric energy is converted into microwaves and then transmitted.

According to the wireless charging-based power transmission method, power is transmitted between the first coil on the transmitting side and the second coil on the receiving side. The transmitting side generates a magnetic field, and induces or resonates a current at the receiving side according to a change in the magnetic field, thereby generating energy.

Wireless charging technology using an electromagnetic induction type or a magnetic resonance type has recently been widely used in electronic devices such as smart phones. If a power transmitting unit (power transmitting unit, PTU) (e.g., a wireless charging pad) contacts a power receiving unit (power receiving unit, PRU) (e.g., a smart phone) or is in proximity within a predetermined distance, a battery of the PRU may be charged by electromagnetic induction or electromagnetic resonance between a transmitting coil of the PTU and a receiving coil of the PRU.

Meanwhile, if a Foreign Object (FO) (e.g., a Metal Object (MO)) exists between the wireless PTU and the wireless PRU during wireless charging, a magnetic field generated between the wireless PTU and the wireless PRU may increase the temperature of the FO and may cause a fire risk of the wireless PTU and/or the wireless PRU. The wireless PTU may include a coil for detecting the above FO (hereinafter referred to as a detection coil). The wireless PTU may use a detection coil to detect whether FO is present prior to and/or during wireless charging, and may not initiate wireless power transfer and/or may accordingly cease wireless power transfer, thereby preventing fire risk in the wireless power system.

Disclosure of Invention

Technical problem

The above-described detection coil for foreign matter detection (foreign object detection, FOD) may be disposed near (e.g., above) the conductive pattern (e.g., coil) for generating a magnetic field (e.g., tx field) outward, and an induced voltage (or induced electromotive force) may be generated in the detection coil by the generated magnetic field. The wireless PTU can confirm whether the induced voltage generated in the detection coil is changed, thereby detecting the presence of foreign matter.

However, an unbalanced magnetic field (e.g., tx field) may be generated. For example, in connection with a wireless PTU, the current applied to a conductive pattern (e.g., coil) may vary due to factors such as system power supply variations. As a result, an unbalanced magnetic field may be generated, and the induced voltage may vary regardless of the presence or absence of the foreign matter, thereby reducing the accuracy of the foreign matter detection.

Various embodiments may provide a detection coil including portions (e.g., conductors) that are symmetrical to each other to balance induced voltage variations caused by unbalanced magnetic fields, and a wireless PTU including the detection coil.

Various embodiments may provide a detection coil having a stacked structure of coils including portions (e.g., conductors) that are symmetrical to each other, and a wireless PTU including the detection coil.

Various embodiments may provide a wireless PTU including circuitry for compensating for induced voltage variations caused by factors other than the presence of foreign objects (e.g., system power supply variations).

Technical solution

According to various embodiments, the detection coil may include: a first sub-coil disposed on at least one surface of the first PCB and including a first portion and a second portion having one end connected to one end of the first portion and wound in a direction opposite to a direction in which the first portion is wound; and a second sub-coil disposed on at least one surface of the second PCB except the first PCB and including a third portion and a fourth portion, one end of the fourth portion being connected to one end of the third portion and wound in a direction opposite to a direction in which the third portion is wound, wherein the first portion and the second portion have polygonal shapes symmetrical to each other when viewed from one direction, the third portion and the fourth portion have polygonal shapes symmetrical to each other when viewed from the other direction, the second portion is disposed under the first portion when viewed from the other direction, the fourth portion is disposed under the third portion when viewed from the other direction, and the first sub-coil and the second sub-coil are arranged to partially overlap each other when viewed from the one direction.

According to various embodiments, the detection coil may include a first portion having a first polygonal shape and wound along a first winding direction when viewed from one direction, and a second portion having one end connected to one end of the first portion, having a second polygonal shape different from the first polygonal shape and wound along a second winding direction opposite to the first winding direction when viewed from one direction, wherein the second portion is disposed under the first portion when viewed from the other direction, and the second polygonal shape has the same size as the first polygonal shape when viewed from one direction, and the second polygonal shape is symmetrical with the first polygonal shape about one axis.

According to various embodiments, a wireless power transmitter may include: a detection coil; a transmitting coil configured to supply wireless power to at least one wireless power receiver; and a control circuit, wherein the detection coil includes a plurality of sub-coils, each of the plurality of sub-coils including: a first portion having a first polygonal shape and wound along a first winding direction when viewed from one direction; and a second portion having one end connected to one end of the first portion, having a second polygonal shape different from the first polygonal shape, wound in a second winding direction opposite to the first winding direction, and disposed under the first portion when viewed from the other direction, the second polygonal shape having the same size as the first polygonal shape, and being symmetrical to the first polygonal shape about one axis when viewed from the one direction, and the control circuit is configured to obtain a value based on a first voltage value of a first channel corresponding to a first sub-coil connected to each other of the plurality of sub-coils and a second voltage value of a second channel corresponding to a second sub-coil connected to each other, and recognize the presence of a foreign substance based on the obtained values, during transmission of wireless power to the outside.

Advantageous effects

According to various embodiments, a detection coil for balancing induced voltage variations caused by unbalanced magnetic fields may be used to improve the accuracy of foreign object detection.

According to various embodiments, a detection coil having a stacked structure may be used to improve the accuracy of foreign matter detection.

According to various embodiments, it is possible to compensate for an induced voltage variation caused by factors other than the presence of foreign matter (e.g., a system power supply variation), thereby improving the accuracy of foreign matter detection.

The various advantageous effects exhibited by the present disclosure are not limited to the above-described advantageous effects.

According to various embodiments, a first detection coil and a second detection coil including unit coils having different sizes may be vertically stacked without parallel movement or rotation, so that any unnecessary detection coil area is reduced and an induced voltage difference between the two detection coils is reduced, thereby preventing circuit saturation.

According to various embodiments, a first detection coil and a second detection coil including unit coils having different sizes may be stacked such that zero lines (null lines) of the respective detection coils do not overlap, thereby removing a null region (null region) in which an induced voltage change cannot be detected.

According to various embodiments, zero region removal may increase the SNR of induced voltage variations by signal amplification and may reduce the complexity of post-processing circuitry.

Before proceeding with the following detailed description, it may be advantageous to set forth definitions of certain words and phrases used in this patent document: the terms "include" and "comprise," along with derivatives thereof, mean inclusion without limitation; the term "or" is inclusive, meaning and/or; the phrase "associated with" and "associated with … …," as well as derivatives thereof, may mean inclusion, interconnection with … …, inclusion, connection to or with … …, coupling to or with … …, communicable, cooperation with … …, interleaving, juxtaposition, proximity, being incorporated into or with … …, possessing, having characteristics, or the like; the term "controller" means any device, system, or portion thereof that controls at least one operation, such device may be implemented in hardware, firmware, or software, or some combination of at least two. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

Furthermore, the various functions described below may be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code. The phrase "computer readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer readable medium" includes any type of medium capable of being accessed by a computer, such as Read Only Memory (ROM), random Access Memory (RAM), a hard disk drive, a Compact Disc (CD), a Digital Video Disc (DVD), or any other type of memory. "non-transitory" computer-readable media do not include wired, wireless, optical, or other communication links that transmit transitory electrical or other signals. Non-transitory computer readable media include media that can permanently store data and media that can store data and be later rewritten, such as rewritable optical disks or erasable memory devices.

Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

Drawings

For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts:

fig. 1A shows an example of a detection coil according to a comparative example;

FIG. 1B illustrates an example of a detection coil in accordance with various embodiments;

fig. 2 illustrates a block diagram of a wireless power transmitter and a wireless power receiver, in accordance with various embodiments;

FIG. 3A illustrates an example of a sub-coil included in a detection coil, in accordance with various embodiments;

FIG. 3B illustrates a cross-sectional view of the sub-coil of FIG. 3A, in accordance with various embodiments;

FIG. 4A is a diagram illustrating an arrangement and/or connection relationship of adjacent sub-coils in accordance with various embodiments;

FIG. 4B illustrates a cross-sectional view of a detection coil including a plurality of sub-coils, in accordance with various embodiments;

fig. 5A is a diagram showing an arrangement of detection coils according to various embodiments;

Fig. 5B is a diagram illustrating an area covered by a detection coil in accordance with various embodiments;

fig. 6 is a diagram showing an arrangement of adjacent sub-coils according to various embodiments;

fig. 7 is a diagram illustrating an arrangement and/or connection relationship between regular hexagonal shaped sub-coils according to various embodiments;

fig. 8A is a diagram showing an example of an arrangement of a plurality of detection coils according to various embodiments;

fig. 8B is a diagram showing another example of an arrangement of a plurality of detection coils according to various embodiments;

fig. 9 is a block diagram illustrating components of a wireless power transmitter according to various embodiments;

FIG. 10A illustrates an example of a method for configuring a channel for induced voltage compensation according to various embodiments;

FIG. 10B illustrates an example of a sensing circuit 215 for induced voltage compensation in accordance with various embodiments;

FIG. 11 illustrates an example of a sub-coil included in a detection coil, in accordance with various embodiments;

FIG. 12 illustrates an example of a detection coil including the sub-coil of FIG. 11, in accordance with various embodiments;

fig. 13 illustrates an example of a stacked structure of detection coils according to various embodiments;

fig. 14 is a diagram showing an arrangement of detection coils according to various embodiments; and

Fig. 15 is a diagram showing an arrangement of detection coils according to various embodiments.

Detailed Description

Figures 1A through 15, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will appreciate that the principles of the present disclosure may be implemented in any suitably arranged system or device.

Fig. 1A shows an example of a detection coil 1 according to a comparative example.

Referring to (a) in fig. 1A, the detection coil 1 may include one or more conductors 1A and 1b wound along one winding direction. One or more conductors 1a and 1b may form sub-coils, respectively. For example, the detection coil 1 may include a first conductor 1a and a second conductor 1b wound in the same winding direction (e.g., clockwise (CW) direction). The detection coil 1 may be disposed on a transmission pad of an electronic device (e.g., a wireless power transmitter) for wirelessly transmitting power, for example, and may be disposed above (or in a different position from) a conductive pattern (e.g., a coil) that generates a magnetic field (e.g., tx field) outward. As another example, the detection coil 1 may be included in various electronic devices other than the wireless power transmitter for detecting foreign matter (FO) (e.g., a metal object). When a magnetic field (e.g., tx field) is generated by a conductive pattern (e.g., a coil), an induced voltage (e.g., induced electromotive force) caused by the generated magnetic field may be generated on the detection coil 1 located above the conductive pattern (e.g., the coil). For example, assuming that the magnetic field (e.g., tx field) is uniform, a magnitude V may be generated on a first sub-coil (e.g., first conductor 1 a) and a second sub-coil (e.g., second conductor 1 b) wound along the same winding direction (e.g., CW), respectively ₀ Is set in the above-described state.

Referring to (b) in fig. 1A, when the foreign matter 2 is disposed near the first sub-coil (e.g., the first conductor 1A) of the detection coil 1, the induced voltage of the first sub-coil (e.g., the first conductor 1A) may fluctuate due to the foreign matter 2. For example, the arrangement of the foreign matter 2 may cause a voltage having an amplitude V on the induced voltage of the first sub-coil (e.g., the first conductor 1 a) _x Induced voltage fluctuation + -V of (2) _x . The electronic device (e.g., wireless power transmitter) including the detection coil 1 can detect that the induced voltage fluctuation ±v has been generated _x And/or detecting the generated induced voltage fluctuation + -V _x Within a predetermined range (e.g., greater than or equal to a predetermined amplitude) to detect a difference that may be affected by a magnetic field while wirelessly transmitting power through a conductive pattern (e.g., a coil) provided around the detection coil 1The presence or location of the substance. When the detection coil 1 includes N sub-coils, a signal-to-noise ratio (SNR) can be obtained by equation 1.

Fig. 1B illustrates an example of a detection coil 100 in accordance with various embodiments.

Referring to (a) in fig. 1B, the detection coil 100 may include one or more conductors 100a and 100B wound in different directions. According to various embodiments, one or more conductors 100a and 100b may each form a sub-coil. For example, a first conductor 100a wound in a clockwise direction (CW) may form a first sub-coil, while a second conductor 100b wound in a counterclockwise direction (CCW) may form a second sub-coil. Fig. 1A (a) shows one first sub-coil (e.g., a first conductor 100a wound in a clockwise direction (CW)) and one second sub-coil (e.g., a second conductor 100b wound in a counterclockwise direction (CCW)), but may include two or more conductors wound in a clockwise direction (CW) or a counterclockwise direction (CCW). According to various embodiments, the detection coil 100 may be included in a transmission pad of an electronic device (e.g., a wireless power transmitter) for wireless transmission of power, for example, and may be disposed over a conductive pattern (e.g., a coil) and/or ferrite (e.g., spoke-type ferrite) that generates a magnetic field (e.g., tx field) outward. For another example, the detection coil 100 may be included in various electronic devices other than the wireless power transmitter for detecting a foreign substance (e.g., a metal object). When a magnetic field (e.g., tx field) is generated by a conductive pattern (e.g., a coil), an induced voltage caused by the generated magnetic field may be generated on the detection coil 100 located above the conductive pattern (e.g., the coil). For example, assume that the magnetic field (e.g., tx field) is uniform, having opposite magnitudes (e.g., +V ₀ or-V ₀ ) May be respectively generated on a first sub-coil (e.g., the first conductor 100 a) and a second sub-coil (e.g., the second conductor 100 b) wound along winding directions different from each other. In accordance with the various embodiments of the present invention,conductors wound along different winding directions (e.g., first conductor 100a and second conductor 100 b) may be connected in series with each other to form a first portion and a second portion of one sub-coil. In this case, assuming that the magnetic field is uniform, the induced voltage generated in each portion may cancel (offset). When the magnetic field (e.g., tx field) is not uniform, at least a portion of the induced voltage generated on each portion (e.g., a portion corresponding to the first conductor 100a and a portion corresponding to the second conductor 100 b) of the serially connected sub-coils wound in different winding directions may not cancel and may be generated to have an amplitude V _dis Is not offset by the amount of (a).

Referring to (B) in fig. 1B, when the foreign matter 2 is disposed near a first portion (e.g., the first conductor 100 a) of the detection coil 100, an induced voltage of the first portion (e.g., the first conductor 100 a) may fluctuate due to the foreign matter 2. For example, the arrangement of the foreign matter 2 may cause a magnitude V on the induced voltage of the first portion (e.g., the first conductor 100 a) _x Induced voltage fluctuation + -V of (2) _x . An electronic device (e.g., a wireless power transmitter) including the detection coil 100 may detect that an induced voltage fluctuation Vx has been generated and/or that the generated induced voltage fluctuation Vx is within a predetermined range (e.g., greater than or equal to a predetermined amplitude) to detect the presence or position of a foreign object that may be affected by a magnetic field while wirelessly transmitting power through a conductive pattern (e.g., a coil) provided around the detection coil 100. In this case, a signal-to-noise ratio (SNR) can be obtained by equation 2.

When the magnetic field (e.g., tx field) is not uniform, V of equation 2 _dis The non-cancelled amount of each induced voltage of the portions of the sub-coils connected in series (e.g., the portion corresponding to the first conductor 100a and the portion corresponding to the second conductor 100 b) wound in different directions may be represented. Amount of non-cancellation V _dis May be smaller than at each portion (e.g., the portion corresponding to the first conductor 100aAnd a portion corresponding to the second conductor 100 b)), the magnitude V of the induced voltage generated on the second conductor 100b ₀ Is a value of (2). In the ideal case of uniform magnetic field (e.g., tx field), V _dis May have an amplitude of 0 and the SNR may have an infinite value.

The plurality of conductors wound in the same direction are arranged in the horizontal direction (e.g., the width direction) in the detection coil 1 in the comparative example of fig. 1A, and the plurality of conductors wound in different directions are arranged in the horizontal direction (e.g., the width direction) in the detection coil 100 of fig. 1B. The SNR of the detection coil 100 according to fig. 1B may be relatively higher than that of the detection coil 1 according to fig. 1A. Further, when the conductors (e.g., the first conductor 100a and the second conductor 100B) of the detection coil 100 in fig. 1B are connected in series with each other, the number of channels required to detect the foreign matter 2 can be relatively small as compared with the detection coil 1 in fig. 1A. Further, when the magnetic field generated around the detection coil is unbalanced, in the case of the detection coil 1 of fig. 1A, the induced voltage V generated on each conductor (for example, the first conductor 1A or the second conductor 1 b) is generated regardless of the presence or absence of the foreign matter 2 ₀ And thus the accuracy of Foreign Object Detection (FOD) is low, in the detection coil 100 of fig. 1B, an induced voltage (e.g., V) generated on each portion of the sub-coils (e.g., a portion corresponding to the first conductor 100a and a portion corresponding to the second conductor 100B) connected in series ₀ and-V ₀ ) Offset each other, the accuracy of Foreign Object Detection (FOD) can be relatively high. When portions of the sub-coils (e.g., the first conductor 100a and the second conductor 100 b) are arranged so as not to overlap each other, when the magnetic field generated around the detection coil is unbalanced, the presence of foreign matter may be erroneously detected due to an uncancelled portion of the induced voltage generated by the magnetic field.

Although not shown in the drawings, according to various embodiments, portions of the sub-coils (e.g., the first conductor 100a and the second conductor 100 b) may be disposed in different surfaces from each other (e.g., stacked in a vertical direction), a first portion (e.g., a portion corresponding to the first conductor 100 a) is disposed on the first surface, and a second portion (e.g., a portion corresponding to the second conductor 100 b) is connected in series with each other to form one sub-coil, and will be described in detail with reference to drawings to be described below. The detection coil 100 including portions arranged in different surfaces in the vertical direction (e.g., a portion corresponding to the second conductor 100b and a portion corresponding to the second conductor 100 b) may be referred to as a vertical gradiometer coil. The shape or arrangement of the portions of the above-described serially-connected sub-coils will be described in detail with reference to the drawings described below. Hereinafter, a group of two conductors wound in different directions will be described as a "sub-coil", a conductor wound in a clockwise direction or a counterclockwise direction will be described as a "part of a sub-coil", and the detection coil 100 will be described as including one or more "sub-coils".

Fig. 2 illustrates a block diagram of a wireless power transmitter and a wireless power receiver, in accordance with various embodiments.

According to various embodiments, the wireless power transmitter 200 (e.g., a wireless power device) may include a power transfer circuit 220, a control circuit 212, a communication circuit 230, a sensing circuit 215, and/or a storage circuit 216.

According to various embodiments, the wireless power transmitter 200 may provide power to the wireless power receiver 250 through the wireless power transmission circuit 220. For example, the wireless power transmitter 200 may transmit power according to a resonance method. In the resonance method, the wireless power transmitter 200 may be implemented in a manner defined by, for example, the wireless power standards alliance (A4 WP) (or the air fuel alliance standard (AFA)). The wireless power transmitter 200 may include a conductive pattern 224 (e.g., a coil), and when a current (e.g., alternating current) flows according to a resonance method or an induction method, the conductive pattern 224 is capable of generating an induction magnetic field (e.g., a Tx field). The process of the wireless power transmitter 200 generating a magnetic field (e.g., tx field) through the conductive pattern 224 may be described as outputting wireless power, and the process of generating an induced electromotive force on the wireless power receiver 250 based on the magnetic field (e.g., tx field) generated through the conductive pattern 224 may be described as receiving wireless power. The wireless power transmitter 200 may be described as wirelessly transmitting power to the wireless power receiver 250 through these processes. Further, the wireless power receiver 250 may include a conductive pattern 276 (e.g., a coil), an induced electromotive force is generated to the conductive pattern 276 by a magnetic field (e.g., tx field) formed therearound, and the size of the conductive pattern 276 may vary according to time. The process of outputting an alternating current from the conductive pattern 276 or applying an alternating current to the conductive pattern 276 according to the generation of an electromotive force induced on the conductive pattern 276 of the wireless power receiver 250 may be described as the wireless power receiver 250 receiving power wirelessly. As another example, the wireless power transmitter 200 may transmit power according to an induction method. In the induction method, the wireless power transmitter 200 may be implemented in a manner defined by, for example, a wireless power alliance standard (WPC) (or Qi standard).

According to various embodiments, the power transmission circuit 220 may include a power adapter 221, a power generation circuit 222, a matching circuit 223, a conductive pattern 224 (e.g., a coil), or a first communication circuit 231. According to various embodiments, the power transmission circuit 220 may be configured to wirelessly transmit power to the wireless power receiver 250 through the conductive pattern 224. According to various embodiments, the power transmission circuit 220 may receive power from the outside in a direct current or alternating current waveform, and may provide the received power to the wireless power receiver 250 in an alternating current waveform.

According to various embodiments, the power adapter 221 may receive direct current or alternating current power from the outside or a power signal of a battery device so as to output direct current having a configured voltage value. According to various embodiments, the value of the direct current voltage output from the power adapter 221 may be controlled by the control circuit 212. According to various embodiments, the direct current output from the power adapter 221 may be output to the power generation circuit 222.

According to various embodiments, the power generation circuit 222 may convert the direct current output from the power adapter 221 into an alternating current and output the alternating current. According to various embodiments, the power generation circuit 222 may include a predetermined amplifier (not shown). According to various embodiments, when the direct current input through the power adapter 221 is less than the configured gain, the power generation circuit 222 may amplify the direct current to the configured gain by using an amplifier (not shown). Alternatively, the power generation circuit 222 may include a circuit for converting the direct current input from the power adapter 221 into the alternating current based on the control signal input from the control circuit 212. For example, the power generation circuit 222 may convert direct current input from the power adapter 221 into alternating current through an inverter (not shown). Alternatively, the power generation circuit 222 may include a gate driving device (not shown). The gate driving device (not shown) may convert the direct current into the alternating current while controlling on/off of the direct current input from the power adapter 221. Alternatively, the power generation circuit 222 may generate an ac power signal through a wireless power generator (e.g., an oscillator).

According to various embodiments, the matching circuit 223 may perform impedance matching. For example, when an alternating current (e.g., an alternating current signal) output from the power generation circuit 222 is transmitted to the conductive pattern 224, an electromagnetic field may be formed on the conductive pattern 224 by the transmitted alternating current signal. The frequency band of the electromagnetic field (e.g., electromagnetic signal) to be generated may be controlled by adjusting the impedance of the matching circuit 223. According to various embodiments, the matching circuit 223 may control the output power transmitted to the wireless power receiver 250 through the conductive pattern 224 by adjusting the impedance to have higher efficiency or higher capacity. According to various embodiments, the matching circuit 223 may adjust the impedance based on the control of the control circuit 212. The matching circuit 223 may include at least one of an inductor (e.g., a coil), a capacitor, or a switch. The control circuit 212 may control a connection state with at least one of the inductor or the capacitor through the switch, and may perform impedance matching accordingly.

According to various embodiments, the conductive pattern 224 may form a magnetic field for inducing a current on the wireless power receiver 250 when a current is applied to the wireless power receiver 250. According to various embodiments, the first communication circuit 231 (e.g., a resonant circuit) may perform communication (e.g., data communication) in an in-band (in-band) manner by using an electromagnetic field generated by the conductive pattern 224.

According to various embodiments, the detection coil 100 may include one or more sub-coils (e.g., a sub-coil in which a portion wound in a clockwise direction and a portion wound in a counterclockwise direction are connected in series with each other). According to various embodiments, portions of the sub-coils may be arranged on different surfaces in directions perpendicular to each other. For example, with respect to one Printed Circuit Board (PCB), a first portion of the sub-coil may be disposed on a first surface (e.g., a lower surface), and a second portion wound in a direction opposite to a direction in which the first portion is wound may be disposed on a second surface (e.g., an upper surface). More specifically, the second portion may be provided at a position corresponding to the vertical direction of the position where the first portion is provided. For example, a portion wound in a clockwise direction may be provided on the upper surface, and a portion wound in a counterclockwise direction may be provided on the lower surface. For another example, a portion wound in a counterclockwise direction may be provided on the upper surface, and a portion wound in a clockwise direction may be provided on the lower surface. According to an embodiment, regarding the two PCBs, a first portion of the sub-coil may be disposed on the first PCB, and a second portion wound in a direction opposite to the first portion may be disposed on the second PCB. According to various embodiments, the sub-coils may be alternately arranged. For example, a portion of the first sub-coil wound in the clockwise direction may be disposed on the second surface (e.g., upper surface), a portion of the first sub-coil wound in the counterclockwise direction is on the first surface (e.g., lower surface), a portion of the second sub-coil adjacent to the first sub-coil wound in the counterclockwise direction is on the second surface (e.g., upper surface), and a portion of the first sub-coil wound in the clockwise direction is on the first surface (e.g., lower surface). According to various embodiments, sub-coils adjacent to each other may be connected in series with each other. For example, a portion of the first sub-coil disposed on the second surface (e.g., upper surface) may be connected in series with an adjacent portion of the second sub-coil disposed on the first surface (e.g., lower surface), or a portion of the first sub-coil disposed on the first surface (e.g., lower surface) may be connected in series with an adjacent portion of the second sub-coil disposed on the second surface (e.g., upper surface). For example, adjacent sub-coils may be connected in series with each other in one of the row direction or the column direction to form one channel. For another example, two or more sub-coils connected in series with each other in a row direction or a column direction may be connected to each other to form one channel. For another example, all sub-coils arranged on one PCB are connected to each other to form one channel.

According to various embodiments, adjacent sub-coils may be arranged to at least partially overlap each other when viewed from one direction (e.g., a perpendicular direction). According to various embodiments, in the overlapping region, directions (e.g., clockwise or counterclockwise) in which adjacent coils are wound may be identical to each other, and a description thereof will be given in detail with reference to drawings to be described.

According to various embodiments, portions of the sub-coils wound in different directions and constituting the detection coil 100 may have the same size (e.g., area) and/or different polygonal shapes (e.g., polygonal shapes symmetrical to each other) when viewed from one direction (e.g., a vertical direction), which will be described in detail with reference to the drawings to be described.

According to various embodiments, the wireless power transmitter 200 may include two or more detection coils (e.g., detection coil 100). For example, the wireless power transmitter 200 may include a first detection coil disposed on a first PCB and a second detection coil disposed on a second PCB (e.g., another PCB substantially parallel to the first PCB). According to various embodiments, the first detection coil and the second detection coil may form channels independent of each other. According to various embodiments, the first detection coil and the second detection coil may form channels independent of each other. According to various embodiments, the first detection coil and the second detection coil may be arranged to partially overlap each other when viewed from one direction (e.g., a vertical direction). For example, the first detection coil and the second detection coil may be arranged such that an area other than a zero area (null area) of a sub-coil of the second detection coil covers at least one zero area of the sub-coil of the first detection coil. Furthermore, at least one zero region of the sub-coil of the second detection coil may be covered by a region other than the zero region of the sub-coil of the first detection coil, a description of which will be given below. For example, when viewed from one direction (e.g., a vertical direction), the sub-coils of the second detection coil disposed at one position may have a pattern corresponding to a pattern formed when the sub-coils of the first detection coil disposed at the same position are moved in parallel by a predetermined distance and/or rotated by a predetermined angle in the row direction and/or the column direction. A description will be given of the same with reference to the drawings described below.

According to various embodiments, the sensing circuit 215 may sense a change in current/voltage applied to the conductive pattern 224 of the power transmission circuit 220. The amount of power to be transmitted to the wireless power receiver 250 may be changed according to the change in the current/voltage applied to the conductive pattern 224. Alternatively, the sensing circuit 215 may sense and/or compensate for the current and/or voltage of at least one channel of the detection coil 100. In other cases, the sensing circuit 215 may sense a temperature change of the wireless power transmitter 200. According to various embodiments, the sensing circuit 215 may include at least one of a current/voltage sensor or a temperature sensor.

According to various embodiments, the control circuit 212 may control the operation of the wireless power transmitter 200. For example, the control circuit 212 may control the operation of the wireless power transmitter 200 by using an algorithm, program, or application that is required to control the wireless power transmitter 200 and that is stored in the storage circuit 216. The control circuit 212 may be implemented in the form of a CPU, microprocessor or small computer. For example, the control circuit 212 may display the state of the wireless power receiver 250 on the display unit 217 based on a message received from the wireless power receiver 250 through the communication circuit 230.

According to various embodiments, the control circuit 212 may control the wireless transmission of power to the wireless power receiver 250 through the wireless power transmission circuit 220. According to various embodiments, the control circuit 212 may control the wireless reception of information from the wireless power receiver 250 through the communication circuit 230. According to various embodiments, the control circuit 212 may identify the induced voltage and/or a value related to the induced voltage fluctuation output from the sensing circuit 215. According to various embodiments, the control circuit 212 may control at least a portion of the sensing circuit 215 (e.g., the compensation circuit 910 to be described below) based on a value output from the sensing circuit 215, and a description thereof will be given in detail with reference to the drawings to be described below. According to various embodiments, the control circuit 212 may detect the presence and/or position of foreign matter that may be affected by the magnetic field based on the value output from the sensing circuit 215 while wirelessly transmitting power through the conductive pattern 224 disposed around the detection coil 100. According to various embodiments, when a foreign object is detected around the detection coil 100, the control circuit 212 may perform a specified operation corresponding to the detection of the foreign object. For example, the control circuit 212 may not start an operation of wirelessly transmitting power to the wireless power receiver 250 and/or stop an operation of wirelessly transmitting power to the wireless power receiver 250. For another example, the control circuit 212 may output a notification (e.g., an alarm sound) through an output device (e.g., a speaker) of the wireless power transmitter 200, and/or control the wireless power receiver 250 to output a notification (e.g., an alarm sound) through an output device (e.g., a speaker).

According to an embodiment, the information received from the wireless power receiver 250 may include at least one of charging configuration information related to a battery state of the wireless power receiver 250, power control information related to an amount of power to be transmitted to the wireless power receiver 250, environment information related to a charging environment of the wireless power receiver 250, or time information of the wireless power receiver 250. According to an embodiment, the charging configuration information may be information related to a battery state of the wireless power receiver 250 at a point of time of wireless charging between the wireless power transmitter 200 and the wireless power receiver 250. For example, the charging configuration information may include at least one of a total capacity of a battery of the wireless power receiver 250, a remaining battery amount, a number of times of charging, a battery usage, a charging mode, a charging method, or a wireless reception band. According to an embodiment, the power control information may include information for controlling the transmitted power amount according to a change in the power amount charged in the wireless power receiver 250 during wireless charging between the wireless power transmitter 200 and the wireless power receiver 250. According to an embodiment, the environment information may be information obtained by measuring a charging environment of the wireless power receiver 250 by the sensing circuit 255 of the wireless power receiver 250, and may include, for example, at least one of temperature data including at least one of an internal temperature or an external temperature of the wireless power receiver 250, illuminance data indicating illuminance (brightness) around the wireless power receiver 250, or sound data indicating sound (noise) around the wireless power receiver 250. According to an embodiment, the control circuit 212 may control generation of power to be transmitted to the wireless power receiver 250 or transmission of power based on charging configuration information in information received from the wireless power receiver 250. Alternatively, the control circuit 212 may determine or change the amount of power to be transmitted to the wireless power receiver 250 based on at least a portion of the information received from the wireless power receiver 250 (e.g., at least one of power control information, environmental information, or time information). In other cases, the control circuit 212 may control the matching circuit 223 to change the impedance.

According to various embodiments, the display unit 217 may display overall information related to the state of the wireless power transmitter 200, environmental information, or a state of charge.

According to various embodiments, the communication circuit 230 may communicate with the wireless power receiver 250 in a predetermined manner. The communication circuit 230 may perform data communication with the communication circuit 280 of the wireless power receiver 250. For example, the communication circuit 230 may unicast, multicast or broadcast signals.

According to an embodiment, the communication circuit 230 may include at least one of the first communication circuit 231 or the second communication circuit 232, wherein the first communication circuit 231 is implemented as one hardware together with the power transmission circuit 220 such that the wireless power transmitter 200 may perform communication in an in-band manner, and the second communication circuit 232 is implemented as a different hardware from the power transmission circuit 220 such that the wireless power transmitter 200 may perform communication in an out-of-band (out-of-band) manner.

According to an embodiment, when the communication circuit 230 includes the first communication circuit 231 capable of performing communication in an in-band manner, the first communication circuit 231 may receive the electromagnetic field signal frequency and the signal level received through the conductive pattern 224 of the power transmission circuit 220. The control circuit 212 may decode the electromagnetic field signal frequency and signal level received through the conductive pattern 224 to extract information received from the wireless power receiver 250. Alternatively, the first communication circuit 231 may apply (e.g., change the impedance of a load (e.g., the conductive pattern 224) according to an on/off-key modulation method) to the conductive pattern 224 of the power transmission circuit 220, or add a signal of information about the wireless power transmitter 200 to an electromagnetic field signal generated by applying a signal output from the matching circuit 223 to the conductive pattern 224, in order to transmit the information of the wireless power transmitter 200 to the wireless power receiver 250. The control circuit 212 may change a connection state with at least one of an inductor and a capacitor of the matching circuit 223 by controlling on/off of a switching device included in the matching circuit 223, thereby controlling information of the wireless power transmitter 200 to be output.

According to an embodiment, when the communication circuit 230 includes the second communication circuit 232 capable of performing communication in an out-of-band manner, the second communication circuit 232 may perform communication with the communication circuit 280 (e.g., the second communication circuit 282) of the wireless power receiver 250 by using a Near Field Communication (NFC), zigbee communication, infrared communication, visible light communication, bluetooth communication, or Bluetooth Low Energy (BLE) method.

The communication methods of the communication circuit 230 described above are merely exemplary, and the scope of the claims of the present disclosure is not limited to the specific communication methods performed by the communication circuit 230 in the embodiments disclosed herein.

According to various embodiments, the wireless power receiver 250 (e.g., a wireless power receiving device) may include a power receiving circuit 270, a control circuit 252, a communication circuit 280, a sensing circuit 255, and/or a display unit 257.

According to various embodiments, the power receiving circuit 270 may receive power from the power transmitting circuit 220 of the wireless power transmitter 200. The power receiving circuit 270 may be implemented in an integrated battery form or a power receiving interface form to receive power from the outside. The power receiving circuit 270 may include a matching circuit 271, a rectifying circuit 272, a regulating circuit 273, a battery 275, and/or a conductive pattern 276.

According to various embodiments, the power receiving circuit 270 may receive wireless power in the form of electromagnetic waves through the conductive pattern 276, the electromagnetic wave form being formed corresponding to the current/voltage applied to the conductive pattern 224 of the power transmitting circuit 220. For example, the power receiving circuit 270 may receive power by using induced electromotive forces formed on the conductive pattern 276 of the power receiving circuit 270 and the conductive pattern 224 of the power transmitting circuit 220.

According to various embodiments, the matching circuit 271 may perform impedance matching. For example, power transmitted through the conductive pattern 224 of the wireless power transmitter 200 may be transferred to the conductive pattern 276 to form an electromagnetic field. According to various embodiments, the matching circuit 271 may adjust the frequency band of the generated electromagnetic field (e.g., electromagnetic signal) by adjusting the impedance. According to various embodiments, the matching circuit 271 may control the input power received from the wireless power transmitter 200 through the conductive pattern 276 to have higher efficiency and higher capacity through such adjustment of impedance. According to various embodiments, the matching circuit 271 may adjust the impedance based on the control of the control circuit 252. The matching circuit 271 may include at least one of an inductor (e.g., a coil), a capacitor, or a switching device. The control circuit 252 may control a connection state with at least one of the inductor or the capacitor through the switch, and may perform impedance matching accordingly.

According to various embodiments, the rectification circuit 272 may rectify wireless power received through the conductive pattern 276 into a direct current form, and may be implemented in a bridge diode form, for example.

According to various embodiments, the regulation circuit 273 may convert the rectified current with a configured gain. The regulation circuit 273 may include a DC/DC converter (not shown). For example, the regulation circuit 273 may convert the rectified current so that the voltage of the output terminal becomes 5V. Alternatively, a minimum value or a maximum value of the voltage suitable for the front end of the adjustment circuit 273 may be configured.

According to various embodiments, the switching circuit 274 may connect the regulation circuit 273 and the battery 275. According to various embodiments, the switching circuit 274 may maintain an on/off state according to the control of the control circuit 252.

According to various embodiments, the battery 275 may be charged by receiving a power input from the regulation circuit 273.

According to various embodiments, the sensing circuit 255 may sense a state change of the power received by the wireless power receiver 250. For example, the sensing circuit 255 may periodically or aperiodically measure the current/voltage value received by the conductive pattern 276 through the predetermined current/voltage sensor 255 a. According to various embodiments, the wireless power receiver 250 may calculate an amount of power received by the wireless power receiver 250 based on the current/voltage measured by the predetermined current/voltage sensor 255 a. According to various embodiments, the sensing circuit 255 may sense a change in the charging environment of the wireless power receiver 250. For example, the sensing circuit 255 may periodically or aperiodically measure at least one of the internal temperature or the external temperature of the wireless power receiver 250 through a predetermined temperature sensor 255 b.

According to various embodiments, the display unit 257 may display all information related to the state of charge of the wireless power receiver 250. For example, the display unit 257 may display at least one of a total capacity of the battery, a remaining battery amount, a charged battery amount, a battery usage amount, or an expected charging time of the wireless power receiver 250.

According to various embodiments, the communication circuit 280 may communicate with the wireless power transmitter 200 in a predetermined manner. The communication circuit 280 may perform data communication with the communication circuit 230 of the wireless power transmitter 200. According to various embodiments, the communication circuit 280 may operate similar to or the same as the communication circuit 230 of the wireless power transmitter 200.

According to various embodiments, the control circuit 252 may transmit charging configuration information for receiving a required amount of power to the wireless power transmitter 200 through the communication circuit 280 based on information related to the battery state of the wireless power receiver 250. For example, when the wireless power transmitter 200 is identified, the control circuit 252 may transmit charging configuration information for receiving a required amount of power to the wireless power transmitter 200 through the communication circuit 280 based on at least one of a total capacity of a battery of the wireless power receiver 250, a remaining battery amount, a number of times of charging, a battery usage, a charging mode, a charging method, or a wireless reception frequency band.

According to various embodiments, the control circuit 252 may transmit power control information for controlling the power received from the wireless power transmitter 200 according to a change in the power charged in the wireless power receiver 250 to the wireless power transmitter 200 through the communication circuit 280.

According to various embodiments, the control circuit 252 may transmit the environment information according to the charging environment of the wireless power receiver 250 to the wireless power transmitter 200 through the communication circuit 280. For example, when the temperature data value measured by the sensing circuit 255 is greater than or equal to the configured temperature reference value, the control circuit 252 may transmit the measured temperature data to the wireless power transmitter 200.

According to an embodiment, the wireless power receiver 250 may include the detection coil 100. When recognizing the change in the induced voltage by using the detection coil 100, the wireless power receiver 250 may detect the presence and/or location of the foreign matter (FO). When a foreign object is detected, the wireless power receiver 250 (e.g., the control circuit 252) may control the switching circuit 274 to be in an off state and/or transmit information indicating that a foreign object has been detected to the wireless power transmitter 200.

Fig. 2 shows that the wireless power transmitter 200 and the wireless power receiver 250 include the power transmission circuit 220 and the power reception circuit 270, respectively, but the wireless power transmitter 200 and the wireless power receiver 250 may each include the power transmission circuit 220 and the power reception circuit 270. Thus, according to various embodiments, the wireless power transmitter 200 and the wireless power receiver 250 may perform the functions of a transmitter and a receiver.

Fig. 3A illustrates an example of a sub-coil 300 included in a detection coil (e.g., detection coil 100 in fig. 1B) in accordance with various embodiments; fig. 3B illustrates a cross-sectional view of the sub-coil 300 in fig. 3A, in accordance with various embodiments.

Referring to fig. 3A, a sub-coil 300 may include portions 301 and 303 wound in different directions according to various embodiments. For example, the sub-coil 300 may include a first portion 301 wound in a counterclockwise direction (CCW) and a second portion 303 wound in a clockwise direction (CW).

According to various embodiments, portions 301 and 303 of sub-coil 300 may be formed in a polygonal shape. For example, the first portion 301 may have a triangular (e.g., regular triangle) shape when viewed from one direction (e.g., the front direction of the sub-coil 300). The second portion 303 may have a triangular (e.g., inverted triangular) shape when viewed from one direction (e.g., the front direction of the sub-coil 300). According to an embodiment, the portions 301 and 303 of the sub-coil 300 wound in different directions may be formed to have a polygonal shape instead of a triangular shape, such as a square, pentagon, or hexagon, or to have a circular shape.

According to various embodiments, portions 301 and 303 of sub-coil 300 wound in different directions may have substantially the same size shape (e.g., area). For example, in the sub-coil 300, an area (e.g., a triangle area) formed by the first portion 301 may be substantially the same as an area (e.g., an inverted triangle area) formed by the second portion 303, but is not limited thereto.

According to various embodiments, the portions 301 and 303 of the sub-coil 300 wound in different directions may have different polygonal shapes when viewed from one direction (e.g., the front direction of the sub-coil 300). For example, the first portion 301 may have a regular triangle shape when viewed from one direction (e.g., the front direction of the sub-coil 300). The second portion 303 may have an inverted triangle shape when viewed from one direction (e.g., the front direction of the sub-coil 300).

According to various embodiments, the portions 301 and 303 of the sub-coil 300 wound in different directions may have shapes symmetrical to each other. For example, when viewed from one direction (e.g., the front direction of the sub-coil 300), the center O (e.g., centroid) of the first portion 301 may match the center O (e.g., centroid) of the second portion 303, and the first portion 301 and the second portion 303 may have shapes symmetrical to each other about one axis. For example, the second portion 303 may have a shape that rotates 1 when the first portion 301 is rotated relative to an axis that passes through the center O (e.g., centroid) in a vertical direction (e.g., forward direction of the sub-coil 300)80 degrees (e.g., point symmetry). For another example, the second portion 303 may have a shape obtained when the shape of the first portion 301 is inverted (e.g., vertically inverted) (e.g., line symmetrical) with respect to an axis passing through the center O (e.g., centroid) in a horizontal direction (e.g., lateral direction of the sub-coil 300). In this way, the portions 301 and 303 of the sub-coil 300 wound in different directions may share the same center O and have shapes symmetrical to each other, and thus, even when the detection coil 100 including the sub-coil 300 is disposed in an unbalanced magnetic field (e.g., tx field), induced voltages generated in the sub-coil 300 may be effectively cancelled. For example, the first portion 301 and the second portion 303 may overlap each other through the first region 305. Based on the first portion 301 and the second portion 303 wound in different directions overlapping each other through the first region 305, the induced voltage generated on each of the first portion 301 and the second portion 303 can be mostly cancelled. Even when the foreign matter 2 is disposed on (or around) the first region 305, the induced voltage (e.g., a change in the induced voltage) may cancel out, so that the change in the induced voltage may not be detected, and the first region 305 may be described as a zero region. Since the portions 301 and 303 of the sub-coil 300 wound in different directions have shapes symmetrical to each other, at least a portion of the regions where the portions 301 and 303 are formed do not overlap each other. For example, the first portion 301 and the second portion 303 may not overlap each other through the second region 307. Based on the first portion 301 and the second portion 303 not overlapping each other through the second region 307, at least a portion of the induced voltage (e.g., a change in the induced voltage) generated on each of the first portion 301 and the second portion 303 is not canceled when the foreign matter 2 is disposed on (or around) at least a portion of the second region 307. For example, when the foreign matter 2 is disposed at the left lower end of the second portion 303, the induced voltage generated on the first portion 301 fluctuates, but the induced voltage generated on the second portion 303 does not fluctuate, and thus the induced voltage does not completely cancel. Thus, a change in the induced voltage generated on the sub-coil 300 may be detected, and the second region 307 may be described as a detection region. According to various embodiments, the other end 301b of the first portion 301 and Voltage difference V between the other ends 303b of the second portion 303 _out May be calculated, for example, according to equation 3.

V _out ＝V _CW -V _CCW ＝N _CW (V0 _± V _xCW )-N _CCW (V ₀ ±V _xCCW )＝V ₀ (N _CW -N _CCW )±(V _xCW N _CW -V _xCCW N _CCW )

Equation 3

In equation 3, "V _CW -V _CCW "means the voltage difference between the other end 301b of the first portion 301 and the other end 303b of the second portion 303. "N _CCW "AND" N _CW "indicates the number of turns (number of turns) of the first portion 301 and the number of turns of the second portion 303, respectively. V (V) ₀ "indicates the magnitude of the induced voltage per 1 turn generated on the first portion 301 or the second portion 303. V (V) _xCCW "and" V _xCW "indicates the magnitude of each 1 turn change of the induced voltage generated on the first portion 301 and the second portion 303, respectively. When the size of the sub-coil 300 is sufficiently small (e.g., smaller than foreign matter disposed around the sub-coil 300), the magnetic field densities of the first portion 301 and the second portion 303 for linking the sub-coil 300 are the same, and thus it is possible to generate a magnetic field having the same size (V on the sub-coil 300 ₀ ) Is set in the above-described state. When the number of turns (e.g., N _CCW ＝N _CW ) When the same, the induced voltages generated on each of the first portion 301 and the second portion 303 may cancel each other (e.g., V ₀ (N _CW -N _CCW ) 0). Thus, by measuring the voltage difference V between the other end 301b of the first portion 301 and the other end 303b of the second portion 303 _out The presence and/or location of foreign matter around the sub-coil 300 may be detected.

According to various embodiments, portions 301 and 303 of sub-coil 300 may be wound multiple turns. For example, the first portion 301 may be formed by winding a plurality of turns in a counterclockwise direction. The second portion 303 may be formed by winding a plurality of turns in a clockwise direction. For example, each of the first portion 301 and the second portion 303 may be wound in a counterclockwise direction or a clockwise direction for a plurality of turns to form a polygonal shape (e.g., a triangle shape or an inverted triangle shape).

According to various embodiments, the portions 301 and 303 of the sub-coil 300 wound in different directions may be connected to each other. For example, one end 301a of the first portion 301 may be connected to one end 303a of the second portion 303 such that the first portion 301 and the second portion 303 are connected to one another. In an example, the sub-coil 300 may further include a connection conductor extending in a vertical direction to connect one end 301a of the first portion 301 and one end 303a of the second portion 303. When the first portion 301 and the second portion 303 are disposed on opposite surfaces of the PCB, the connection conductor may connect the first portion 301 and the second portion 303 through a through hole passing through the PCB, but a connector for connecting the two portions 301 and 303 is not limited. More specifically, a first portion 301 wound one or more turns in a counterclockwise direction is formed, and then a second portion 303 wound one or more turns in a clockwise direction is formed from one end 301a of the first portion 301, thereby forming a sub-coil 300 including the first portion 301 and the second portion 303 wound in different directions. For example, FIG. 3B shows a cross-sectional view of the sub-coil 300 taken along A-A' in FIG. 3A. According to various embodiments, the first portion 301 of the sub-coil 300 may be formed to be wound in a counterclockwise direction, entering at a first point 301c in the front direction of the sub-coil 300, and exiting at a second point 301d in the front direction of the sub-coil 300 when viewed from one direction (e.g., the front direction of the sub-coil 300). The first portion 301 may extend from a first point 301c to an end 301a, which end 301a may be connected to an end 303a of the second portion 303. The second portion 303 of the sub-coil 300 may be formed to be wound in a clockwise direction, to exit at a third point 303c of the front direction of the sub-coil 300, and to enter at a fourth point 303d of the front direction of the sub-coil 300 when viewed from one direction (e.g., the front direction of the sub-coil 300).

According to various embodiments, the other end 301b of the first portion 301 and/or the other end 303b of the second portion 303 may be connected to a sensing circuit (e.g., sensing circuit 215 in fig. 2). According to various embodiments, when the detection coil 100 includes the plurality of sub-coils 300 illustrated in fig. 3, the other end 301b of the first portion 301 and/or the other end 303b of the second portion 303 may be connected (e.g., connected in series) to the first portion and/or the second portion of an adjacent sub-coil, and a description thereof will be given in detail with reference to drawings to be described below.

According to various embodiments, the portions 301 and 303 of the sub-coil 300 wound in different directions may be disposed on different surfaces from each other. For example, referring to fig. 3B, the first portion 301 may be disposed on a first surface and the second portion 303 may be disposed on a second surface different from the first surface. For example, the sub-coil 300 may be disposed on both surfaces of the PCB, the first portion 301 may be disposed on a first surface (e.g., a lower surface) of the PCB, and the second portion 303 may be disposed on a second surface (e.g., an upper surface) of the PCB. One end 301a of the first portion 301 and one end 303a of the second portion 303 may be connected to each other by a PCB. According to various embodiments, when the detection coil 100 includes the plurality of sub-coils 300 illustrated in fig. 3A, the other end 301b of the first portion 301 may be connected to a first portion of an adjacent sub-coil (e.g., an adjacent sub-coil disposed on the same PCB), and/or the other end 303b of the second portion 303 may be connected to a second portion of an adjacent sub-coil (e.g., an adjacent sub-coil disposed on the same PCB), and a description thereof will be given in detail with reference to the drawings to be described below. In this case, the first portion of the adjacent sub-coil may be disposed on the second surface (e.g., upper surface), and the second portion of the adjacent sub-coil may be disposed on the first surface (e.g., lower surface). For example, the other end 301b of the first portion 301 disposed on the first surface may be connected to one end of the first portion of the adjacent sub-coil disposed on the second surface by a PCB, and/or the other end 303b of the second portion 303 disposed on the second surface may be connected to one end of the second portion of the adjacent sub-coil disposed on the first surface by a PCB.

According to various embodiments, the sub-coils 300 may be connected (e.g., connected in series) to at least one adjacent sub-coil to form one channel. According to an embodiment, the sub-coils of the detection coil 100 may each form an independent (e.g., respective) channel.

Fig. 4A is a diagram illustrating an arrangement and/or connection relationship of adjacent sub-coils 410 and 430 (e.g., sub-coil 300 in fig. 3A) in accordance with various embodiments; fig. 4B illustrates a cross-sectional view of a detection coil 100 including a plurality of sub-coils 410 and 430, according to various embodiments.

Referring to (a) and (b) in fig. 4A, a method for forming the detection coil 100 including a plurality of sub-coils is shown. According to various embodiments, the first sub-coil 410 (e.g., sub-coil 300 in fig. 3A) may include a first portion 411 wound in a counterclockwise direction (CCW) and a second portion 413 wound in a clockwise direction (CW). According to various embodiments, the second sub-coil 430 (e.g., sub-coil 300 in fig. 3A) may include a first portion 431 wound in a counterclockwise direction (CCW) and a second portion 433 wound in a clockwise direction (CW).

According to various embodiments, the first sub-coil 410 may be configured to be connected (e.g., connected in series) to the second sub-coil 430 adjacent thereto. For example, referring to (a) in fig. 4A, one end 412 (e.g., the other end 303b in fig. 3A) of the second portion 413 of the first sub-coil 410 may be disposed to be connected to one end 432 (e.g., the one end 303A in fig. 3A) of the second portion 433 of the adjacent second sub-coil 430. According to various embodiments, when the detection coil 100 includes three or more sub-coils, the first portion 411 of the first sub-coil 410 or the first portion 431 of the second sub-coil 430 may be configured to be connected (e.g., connected in series) to the first portion of an adjacent third sub-coil (not shown). A third sub-coil (not shown) may be arranged such that its centroid is located (e.g., parallel in the row direction) at the center O connecting the first sub-coil 410 ₁ (e.g., centroid) and center O of second sub-coil 430 ₂ (e.g., centroid) on an extension of the center of mass.

According to various embodiments, adjacent sub-coils 410 and 430 may be arranged to at least partially overlap each other when viewed from one direction (e.g., the forward direction of sub-coils 410 and 430). For example, portions of the first and second sub-coils 410 and 430 wound in the same direction (e.g., clockwise or counterclockwise) may partially overlap each other. For example, referring to (b) of fig. 4A, in the first and second sub-coils 410 and 430, the first portion 411 wound in the counterclockwise direction and the first portion 431 wound in the counterclockwise direction may be disposed to partially overlap each other, and the second portion 413 wound in the clockwise direction and the second portion 433 wound in the clockwise direction may be disposed to partially overlap each other. According to various embodiments, when the detection coil 100 includes three or more sub-coils, the first portion 411 (or the first portion 431) of the first sub-coil 410 (or the second sub-coil 430) wound in the counterclockwise direction may overlap at least partially with the first portion of the third sub-coil (not shown) wound in the counterclockwise direction, and the second portion 413 (or the second portion 433) of the first sub-coil 410 (or the second sub-coil 430) wound in the clockwise direction may overlap at least partially with the second portion of the third sub-coil (not shown) wound in the clockwise direction. According to various embodiments, the induced voltage change generated when a foreign object is placed around the sub-coils 410 and 430 is increased (e.g., doubled) by a region in which the first portions of the adjacent sub-coils overlap each other and/or a region in which the second portions of the adjacent sub-coils overlap each other, and a description thereof will be given in detail with reference to drawings to be described below.

According to various embodiments, adjacent sub-coils 410 and 430 may be alternately arranged. For example, referring to (a) and (B) in fig. 4B, the first sub-coil 410 may be disposed such that the first portion 411 is located on a first surface (e.g., a lower surface) of the PCB and the second portion 413 is located on a second surface (e.g., an upper surface) of the PCB. The second sub-coil 430 adjacent to the first sub-coil 410 may be disposed such that the first portion 431 is located on a second surface (e.g., upper surface) of the PCB and the second portion 433 is located on a first surface (e.g., lower surface) of the PCB. Although not shown, a third sub-coil (not shown) adjacent to the second sub-coil 430 may be provided such that the first portion is located on a first surface (e.g., a lower surface) of the PCB and the second portion is located on a second surface (e.g., an upper surface) of the PCB. The arrangement of the plurality of sub-coils described above may be summarized in, for example, table 1.

TABLE 1

Fig. 5A is a diagram showing an arrangement of a detection coil (e.g., detection coil 100 in fig. 2) according to various embodiments; fig. 5B is a diagram illustrating an area covered by a detection coil (e.g., detection coil 100 in fig. 2) according to various embodiments. Referring to (a) and (b) in fig. 5A, the coverage area 501 may be an area in which the detection coil 100 is disposed. According to various embodiments, the detection coil 100 may be disposed to cover the conductive pattern 224. For example, the detection coil 100 may be disposed beyond the region of the conductive pattern 224 with respect to the x-y surface. For example, a sub-coil of the detection coil 100 (e.g., sub-coil 300 in fig. 3A) may be configured to occupy a coverage area 501 having a hexagonal shape. According to various embodiments, the detection coil 100 may be disposed above (e.g., in the +z direction) with respect to the conductive pattern 224 and the ferrite 503. Referring to (a) in fig. 5A, one of the sub-coils (e.g., sub-coil 300 in fig. 3A) included in the detection coil 100 is shown. For example, the sub-coil 300 may include a first portion (e.g., the first portion 301 in fig. 3A) having a width (e.g., a length in the x-axis direction) of a regular triangle having a length (or height) (e.g., a length in the y-axis direction) of h, and a second portion (e.g., the second portion 303 in fig. 3A) of an inverted triangle.

Referring to (B) in fig. 5B, a coverage area 501 is shown. For example, the coverage area 501 may have a width of X (e.g., a length in the X-axis direction) and a length of Y (e.g., a length in the Y-axis direction). According to various embodiments, in order for the sub-coil (e.g., sub-coil 300) of the detection coil 100 to occupy the coverage area 501 having the width of X and the length of Y, the detection coil 100 may include m sub-coils in the width direction (e.g., X-axis direction) and n sub-coils in the length direction (e.g., Y-axis direction), and the relationship between m and n may be calculated by equations 4 to 6.

Fig. 6 is a diagram illustrating an arrangement of adjacent sub-coils 410 and 430 according to various embodiments.

Referring to fig. 6 (a), the detection coil 100 may include a sub-coil (e.g., sub-coil 300 in fig. 3A) configured to cover the coverage area 501. According to various embodiments, a sub-coil (e.g., sub-coil 300) may be connected in series with an adjacent sub-coil, and may be arranged to at least partially overlap the adjacent sub-coil when viewed from one direction (e.g., the forward direction of the detection coil 100).

Referring to (b) in fig. 6, an enlarged view of a portion of the detection coil 100 in the row direction is shown.

According to various embodiments, the first sub-coil 410 and the second sub-coil 430 may be alternately arranged on the same PCB. Referring to (b) in fig. 6, a portion of each sub-coil indicated by a "dotted line" may represent a portion located on a first surface (e.g., a lower surface) of the PCB, and a portion of each sub-coil indicated by a "solid line" may represent a portion located on a second surface (e.g., an upper surface) of the PCB. In this way, on the first surface (e.g., lower surface), the first portion 411 of the first sub-coil 410 and the second portion 433 of the second sub-coil 430 may be disposed adjacent to each other without overlapping each other, and on the second surface (e.g., upper surface), the second portion 413 of the first sub-coil 410 and the first portion 431 of the second sub-coil 430 may be disposed adjacent to each other without overlapping each other. Although not shown, other sub-coils may be disposed at the left side of the first sub-coil 410 or the right side of the second sub-coil 430, and different sub-coils may be arranged such that their centers are aligned at the center O connecting the first sub-coil 410 ₁ And a second sub-coil 430Center O ₂ Is arranged on the extension line of the (c).

According to various embodiments, the first sub-coil 410 and the second sub-coil 430 may be arranged such that portions wound along the same direction overlap each other when viewed from one direction (e.g., a front direction of the sub-coils 410 and 430). For example, when viewed from one direction (e.g., the front direction of the sub-coils 410 and 430), the first portion 411 of the first sub-coil 410 wound in the counterclockwise direction may overlap the first portion 431 of the adjacent second sub-coil 430 wound in the counterclockwise direction. The second portion 413 of the first sub-coil 410 wound in the clockwise direction may overlap the second portion 433 of the adjacent second sub-coil 430 wound in the clockwise direction when viewed from one direction (e.g., the front direction of the sub-coils 410 and 430).

According to various embodiments, the first sub-coil 410 and the second sub-coil 430 may be arranged such that portions wound along different directions do not overlap each other when viewed from one direction (e.g., a front direction of the sub-coils 410 and 430). For example, when viewed from one direction (e.g., the front direction of the sub-coils 410 and 430), the first portion 411 of the first sub-coil 410 wound in the counterclockwise direction does not overlap the second portion 433 of the adjacent second sub-coil 430 wound in the clockwise direction. The second portion 413 of the first sub-coil 410 wound in the clockwise direction does not overlap the first portion 431 of the adjacent second sub-coil 430 wound in the counterclockwise direction when viewed from one direction (e.g., the front direction of the sub-coils 410 and 430).

According to various embodiments, reference numeral 601 represents a first region (e.g., first region 305 in fig. 3A) of the first sub-coil 410 and/or the second sub-coil 430 (in other words, a zero region), and reference numeral 603 represents a second region (e.g., second region 307 in fig. 3A) of the first sub-coil 410 and/or the second sub-coil 430 (in other words, a detection region). As shown in the drawing, the detection region of the first sub-coil 410 may overlap with the detection region of the second sub-coil 430 and the detection region of the sub-coil (not shown) adjacent to the left side thereof, and the detection region of the second sub-coil 430 may overlap with the detection region of the first sub-coil 410 and the detection region of the sub-coil (not shown) adjacent to the right side thereof. For example, a lower region of the region indicated by reference numeral 603 may represent a region in which detection regions formed by first portions (e.g., portions wound in a counterclockwise direction) of adjacent sub-coils overlap each other, and an upper region of the region indicated by reference numeral 603 may represent a region in which detection regions formed by second portions (e.g., portions wound in a clockwise direction) of adjacent sub-coils overlap each other. According to various embodiments, based on the detection region of each sub-coil overlapping with at least a portion of the detection region of an adjacent sub-coil, the accuracy of Foreign Object Detection (FOD) by overlapping the detection regions may be increased. For example, based on detection regions formed by portions (e.g., first portions or second portions) wound in the same direction (e.g., clockwise or counterclockwise) overlapping each other, a signal-to-noise ratio (SNR) of an induced voltage change generated by each detection region may increase the number of overlaps (e.g., twice).

Fig. 7 is a diagram illustrating an arrangement and/or connection relationship between regular hexagonal-shaped sub-coils 710, 730, and 750 (e.g., sub-coil 300 in fig. 3A) according to various embodiments.

Referring to (a) of fig. 7, according to various embodiments, the first sub-coil 710 may include a first portion 711 wound in a counterclockwise direction and a second portion 713 wound in a clockwise direction. According to various embodiments, the first portion 711 and the second portion 713 may have a regular hexagonal shape. According to various embodiments, the second portion 713 may have a shape obtained when the shape of the first portion 711 is rotated 180 degrees (e.g., point symmetry) with respect to an axis passing through a point in the vertical direction. According to various embodiments, the second portion 713 may have a shape obtained when the shape of the first portion 711 is vertically inverted (e.g., line symmetrical) with respect to an axis passing through a point in the vertical direction.

According to various embodiments, the first portion 711 and the second portion 713 may be connected (e.g., connected in series) to each other. According to various embodiments, the first portion 711 may be disposed on a first surface (e.g., a lower surface) of the PCB and the second portion 713 may be disposed on a second surface (e.g., an upper surface) of the PCB. Referring to (a) and (b) in fig. 7, the portion indicated by the "dotted line" represents a portion located on a first surface (e.g., a lower surface) of the PCB, and the portion indicated by the "solid line" represents a portion located on a second surface (e.g., an upper surface) of the PCB.

According to various embodiments, a zero region (e.g., the first region 305 in fig. 3A) may be formed based on at least a portion of the first portion 711 and the second portion 713 wound in different directions overlapping each other. According to various embodiments, a detection region (e.g., the second region 305 in fig. 3A) may be formed based on at least a portion of the first portion 711 and the second portion 713 wound in different directions not overlapping each other.

Referring to (b) of fig. 7, a plurality of sub-coils may be alternately arranged on the same PCB according to various embodiments. Referring to (b) of fig. 7, the second and third sub-coils 730 and 750 may be disposed adjacent to the first sub-coil 710. The adjacent second sub-coil 730 may be disposed such that the first portion 731 wound in the counterclockwise direction is located on the second surface (e.g., upper surface) and the second portion 733 wound in the clockwise direction is located on the first surface (e.g., lower surface). An adjacent third sub-coil 750 may be disposed such that the first portion 751 wound in the counterclockwise direction is located on the second surface (e.g., upper surface) and the second portion 753 wound in the clockwise direction is located on the first surface (e.g., lower surface).

According to various embodiments, the detection area of the first sub-coil 710 may at least partially overlap with the detection area of the second sub-coil 730 and/or the detection area of the third sub-coil 750 when viewed from one direction (e.g., the forward direction of the sub-coils 710, 730, and 750). As described above with reference to fig. 6, based on detection regions overlapping each other formed by portions wound in the same direction, the accuracy of Foreign Object Detection (FOD) by the overlapping detection regions can be increased.

According to various embodiments, the first, second, and third sub-coils 710, 730, and 750 may be arranged such that portions wound along different directions thereof do not overlap each other when viewed from one direction (e.g., a front direction of the sub-coils 710, 730, and 750). For example, the first portion 711 of the first sub-coil 710 wound in the counterclockwise direction may not overlap the second portion 733 of the adjacent second sub-coil 730 wound in the clockwise direction and the second portion 753 of the adjacent third sub-coil 750 wound in the clockwise direction. The second portion 713 of the first sub-coil 710 wound in the clockwise direction may not overlap the first portion 731 of the adjacent second sub-coil 730 wound in the counterclockwise direction and the first portion 751 of the adjacent third sub-coil 750 wound in the counterclockwise direction.

Fig. 8A is a diagram showing an example of arrangement of a plurality of detection coils 810 and 830 according to various embodiments; fig. 8B is a diagram illustrating another example of an arrangement of a plurality of detection coils 810 and 830 according to various embodiments.

According to various embodiments, a wireless power transmitter (e.g., wireless power transmitter 200 in fig. 2) may include two or more detection coils (e.g., detection coil 100 in fig. 2). According to various embodiments, the wireless power transmitter 200 may include a first detection coil 810 and a second detection coil 830. Referring to (a) in fig. 8A or (a) in fig. 8B, according to various embodiments, a first detection coil 810 may be disposed on at least one surface of a first PCB 801a, and a second detection coil 830 may be disposed on at least one surface of a second PCB 801B located under the first PCB 801 a. For example, each portion (e.g., a portion wound in a clockwise direction or a counterclockwise direction) constituting the first and second detection coils 810 and 830 may be alternately arranged on the first and second surfaces (e.g., the lower and upper surfaces) of the first PCB 801a or the first and second surfaces (e.g., the lower and upper surfaces) of the second PCB 801b, as described above with reference to fig. 6.

Referring to (B) and (c) in fig. 8A and (B) and (c) in fig. 8B, a portion indicated by a "solid line" represents a portion disposed on at least one surface of the first PCB 801a, and a portion indicated by a "broken line" represents a portion disposed on at least one surface of the second PCB 801B. The region indicated by the "oblique line" represents a zero region (e.g., the first region 305 in fig. 3A) in each of the detection coils 810 and 830. Even if a foreign matter (e.g., foreign matter 2 in fig. 1A) is disposed on the zero region (e.g., first region 305 in fig. 3A), the induced voltage (e.g., induced voltage variation) is canceled, and thus the induced voltage may not be detected on the zero region.

According to various embodiments, the first sub-coil 810 and the second sub-coil 830 may be arranged to have a difference of a predetermined distance therebetween. For example, referring to (b) and (c) in fig. 8A, when viewed from one direction (e.g., a front direction of the first detection coil 810 and the second detection coil 830), the second detection coil 830 may be disposed to have a difference in distance d with respect to one point O in a direction (e.g., a row direction (→)) perpendicular to the one direction (e.g., the front direction). According to an embodiment, the second detection coil 830 may be disposed to have a difference in distance with respect to one point O in a direction (e.g., a front direction) parallel to the one direction (e.g., the front direction) when viewed from the one direction (e.g., the front direction of the first detection coil 810 and the second detection coil 830). According to an embodiment, the second detection coil 830 may be disposed to have a first distance in a direction (e.g., a row direction (→)) perpendicular to one direction (e.g., a front direction) and a second distance in a direction (e.g., a front direction) parallel to the one direction (e.g., the front direction) when viewed from the one direction (e.g., the front direction of the first detection coil 810 and the second detection coil 830)

According to various embodiments, the first sub-coil 810 and the second sub-coil 830 may be arranged to have a predetermined angular difference therebetween. For example, referring to (B) and (c) in fig. 8B, when viewed from one direction (e.g., the front direction of the first detection coil 810 and the second detection coil 830), the second detection coil 830 may be set to differ by an angle θ with respect to one point O.

According to various embodiments, at least a portion of the zero region (e.g., the diagonal region) may be cancelled out based on the difference in the first and second sub-coils 810 and 830 being arranged to have a predetermined distance d and/or a predetermined angle θ therebetween. For example, referring to (d) in fig. 8A or (d) in fig. 8B, when viewed from one direction (e.g., the front direction of the first detection coil 810 and the second detection coil 830), the detection region (e.g., the region without diagonal lines) of the second detection coil 830 may be disposed under a portion of the zero region (e.g., the diagonal line region) of the first detection coil 810. Since the detection region (e.g., a region without diagonal lines) of the second detection coil 830 may be disposed below the portion of the zero region (e.g., a diagonal line region) of the first detection coil 810, when the foreign object 2 is disposed on the portion of the zero region (e.g., a diagonal line region) of the first detection coil 810, an induced voltage change may be detected by the second detection coil 830, and thus, the presence of the foreign object 2 disposed on the portion of the zero region (e.g., a diagonal line region) of the first detection coil 810 may be recognized. For example, referring to (d) in fig. 8A or (d) in fig. 8B, the area 853 marked with a "dot" represents a changed area so that when only the first detection coil 810 is included, the presence of the foreign matter 2 can be detected by including the second detection coil 830 from the area in which the presence of the foreign matter 2 is not recognized (for example, (B) in fig. 8A or (B) in fig. 8B). In other words, the area where the foreign matter detection (FOD) can be performed when the first and second detection coils 810 and 830 are used (for example, an area other than the area indicated by the reference numeral 851) is larger than the area where the foreign matter detection (FOD) can be performed when only the first detection coil 810 is used (for example, an area other than the diagonally lined area in (B) in fig. 8A or (B) in fig. 8B).

Fig. 9 is a block diagram illustrating components of a wireless power transmitter 200 according to various embodiments.

According to various embodiments, the power adapter of the high-side wireless power transmitter (e.g., power adapter 221 in fig. 2) may include a power factor correction (power factor correction, PFC) circuit, while the power adapter 221 of the low-side wireless power transmitter may not include a PFC circuit, but includes a filter capacitor. The low-side wireless power transmitter does not include the PFC circuit, and thus there may be fluctuation in a magnetic field generated from the transmitting coil (e.g., the conductive pattern 224 in fig. 2) according to fluctuation of an external power source (e.g., a system power source), fluctuation of an input voltage of the inverter (e.g., the power generation circuit 222), and/or operation of the inverter (e.g., the power generation circuit 222 in fig. 2). For example, an ac voltage input from a system power supply to a filter capacitor (e.g., power adapter 221) may fluctuate. For example, total Harmonic Distortion (THD) may occur in a voltage output from a filter capacitor (e.g., power adapter 221) and input to an inverter (e.g., power generation circuit 222). As a result, the magnitude of the voltage input to the transmitting coil (e.g., the conductive pattern 224) may fluctuate. For example, depending on whether the wireless power transmitter is in a mode before transmitting output power (e.g., a pre-power mode) or a mode in which output power is transmitted (e.g., a power period (power-power) mode), or depending on the amount of output power being transmitted, the control circuit 212 may adjust an operating frequency (e.g., a switching frequency) of the inverter (e.g., the power generation circuit 222), and the frequency of the current input to the transmission coil (e.g., the conductive pattern 224) may fluctuate. For the above reasons, when the magnitude and/or frequency of the current (e.g., tx current) input to the transmitting coil (e.g., conductive pattern 224) fluctuates, the magnitude and/or frequency of the magnetic field generated from the transmitting coil (e.g., conductive pattern 224) fluctuates, and fluctuation of the induced voltage of the detecting coil 100 may occur regardless of the presence or absence of foreign matter (FO).

Hereinafter, a description will be given of an operation of the low-side wireless power transmitter that does not include the PFC circuit but includes a filter capacitor as the power adapter 221.

According to various embodiments, the wireless power transmitter 200 may include the detection coil 100, the sensing circuit 215, and/or the control circuit 212. According to various embodiments, the sensing circuit 215 may include a compensation circuit 910 and/or an amplification circuit 930.

According to various embodiments, the sensing circuit 215 may sense the voltage (e.g., an induced voltage) of the detection coil 100. According to various embodiments, the sensing circuit 215 may output a value based on the sensed voltage (e.g., an induced voltage) to the control circuit 212.

According to various embodiments, the compensation circuit 910 may compensate the voltage (e.g., induced voltage) of the detection coil 100 based on the value of the reference point 950. For example, the reference point 950 may include at least one of an input terminal of a portion of the detection coil 100, an input terminal of an inverter (e.g., the power generation circuit 222) (e.g., an output terminal of a filter capacitor (e.g., the power adapter 221) or an output terminal of the control circuit 212 (or a Pulse Width Modulation (PWM) circuit)), or an output terminal of an inverter (e.g., the power generation circuit 222) (e.g., an input terminal of the detection coil 100).

According to an embodiment, the compensation circuit 910 may compensate for a voltage (e.g., an induced voltage) of the detection coil 100 based on a sensed voltage at an output terminal of a portion of the detection coil 100. For example, the detection coil 100 may include a first sub-coil connected in series with each other and a second sub-coil connected in series with each other. For example, the first sub-coil may be a sub-coil located on a first portion (e.g., inside) of a coverage area (e.g., coverage area 501 in fig. 5), and the second sub-coil may be a sub-coil located on a second portion (e.g., peripheral area of the first portion) of coverage area 501. The compensation circuit 910 may receive a voltage (e.g., an induced voltage) corresponding to the second sub-coil as a value of the second channel and a voltage (e.g., an induced voltage) corresponding to the first sub-coil as a value of the first channel. The compensation circuit 910 may compensate for the value of the first channel (e.g., the induced voltage sensed from the first sub-coil) based on the value of the second channel (e.g., the induced voltage sensed from the second sub-coil).

According to an embodiment, the compensation circuit 910 may compensate for the voltage (e.g., induced voltage) of the detection coil 100 based on a value sensed at an input terminal (e.g., an output terminal of a filter capacitor (e.g., the power adapter 221) or an output terminal of the control circuit 212) of an inverter (e.g., the power generation circuit 222). For example, the compensation circuit 910 may receive a voltage (e.g., a DC link voltage) sensed at an output terminal of a filter capacitor (e.g., the power adapter 221) as a value of the second channel. The voltage of the output terminal of the filter capacitor (e.g., power adapter 221) may be sensed by a voltage sensor (e.g., voltage distribution circuit), and the compensation circuit 910 may receive the output value of the voltage sensor as the value of the second channel. For another example, the compensation circuit 910 may receive the voltage sensed at the output terminal of the control circuit 212 as the value of the second channel. More specifically, the control circuit 212 may include a PWM circuit or control a PWM circuit provided outside the control circuit 212. A PWM circuit included in the control circuit 212 or provided outside the control circuit 212 may be connected to an inverter (e.g., the power generation circuit 222). The control circuit 212 may adjust the duty cycle of the PWM circuit to adjust the operating frequency of the inverter (e.g., the power generation circuit 222). The compensation circuit 910 may receive the output voltage of the PWM circuit as the value of the second channel. A voltage (e.g., an induced voltage) may be received as a voltage corresponding to at least a portion of the detection coil 100. The compensation circuit 910 may compensate for the value of the first channel (e.g., the induced voltage) based on the value of the second channel (e.g., the DC link voltage or the output voltage of the PWM circuit).

According to an embodiment, the compensation circuit 910 may compensate for the voltage (e.g., induced voltage) of the detection coil 100 based on a value sensed at an output terminal (e.g., an input terminal of the detection coil 100) of the inverter (e.g., the power generation circuit 222). For example, the compensation circuit 910 may receive a current (e.g., tx current) (or Tx voltage) sensed at an input terminal of the detection coil 100 as a value of the second channel. For example, the current (e.g., tx current) sensed at the input terminal of the detection coil 100 may be sensed by a current sensor (e.g., a sensor resistor and/or a hall sensor), and the compensation circuit 910 may receive the output value of the current sensor as the value of the second channel. The compensation circuit 910 may take a voltage (e.g., an induced voltage) corresponding to at least a portion of the detection coil 100 as a value of the first channel. The compensation circuit 910 may compensate the value (e.g., induced voltage) of the first channel based on the value (e.g., tx current) (or Tx voltage) of the second channel.

According to various embodiments, the compensation circuit 910 may normalize the voltage (e.g., induced voltage) of the detection coil 100 based on the value of the above-described reference point 950 to compensate the voltage (e.g., induced voltage) of the detection coil 100, and a description thereof will be given in detail with reference to the drawings to be described below.

According to various embodiments, the compensation circuit 910 may compensate the voltage (e.g., induced voltage) of the detection coil 100 based on the correction value received from the control circuit 212. For example, the control circuit 212 may input a pre-specified correction value (e.g., an offset value) to the compensation circuit 910 based on the presence or absence of a wireless power receiver (e.g., the wireless power receiver 250 in fig. 2), the arrangement of the wireless power receiver 250, and/or the operation mode of the wireless power transmitter 200. The control circuit 212 may recognize whether the wireless power receiver 250 is present on the wireless power transmitter 200 (e.g., on a charging pad) by measuring the impedance of the transmitting coil (e.g., the conductive pattern 224), and may input a different correction value to the compensation circuit 910 according to whether the wireless power receiver 250 is present. The control circuit 212 may identify an alignment state of the wireless power receiver 250 with respect to the transmitting coil (e.g., the conductive pattern 224) based on an impedance of the transmitting coil (e.g., the conductive pattern 224) and power reception information (e.g., a received power amount) of the wireless power receiver 250, and may input a different correction value to the compensation circuit 910 according to the alignment state (e.g., alignment or misalignment) of the wireless power receiver 250. The control circuit 212 may input different correction values to the compensation circuit 910 according to whether the wireless power transmitter 200 is in a mode before transmitting the output power (e.g., a pre-power mode) or in a mode for transmitting the output power (e.g., a power period mode). The compensation circuit 910 may compensate (e.g., apply an offset) the voltage (e.g., induced voltage) of the detection coil 100 based on the correction value received from the control circuit 212. For example, the compensation circuit 910 may apply as much offset of the voltage corresponding to the received correction value to the voltage (e.g., induced voltage) of the detection coil 100. For example, the value of the applied offset may vary according to the correction value received from the control circuit 212, and may be preconfigured.

According to various embodiments, the amplifying circuit 930 may amplify the voltage output from the compensating circuit 910. For example, the amplifying circuit 930 may include at least one operational amplifier (OP-amp). For example, the amplifying circuit 930 may amplify the output voltage to an integer multiple (e.g., five times) the voltage of the compensating circuit 910.

According to various embodiments, control circuit 212 may be implemented as a Microprocessor (MCU) or a micro-control unit, but is not limited thereto. According to various embodiments, the control circuit 212 may be implemented to include analog elements. According to various embodiments, based on the value output from the sensing circuit 215 (e.g., the amplifying circuit 930), the control circuit 212 may determine whether to transmit wireless power through a conductive pattern (e.g., the conductive pattern 224 in fig. 2) and/or control to output a notification through an output device. According to various embodiments, the control circuit 212 may input a pre-specified correction value to the compensation circuit 910 based on the presence or absence of the wireless power receiver 250, the arrangement of the wireless power receiver 250, and/or the operation mode of the wireless power transmitter 200.

FIG. 10A illustrates an example of a method for configuring a channel for induced voltage compensation according to various embodiments; FIG. 10B illustrates an example of a sensing circuit 215 for induced voltage compensation according to various embodiments.

Referring to fig. 10A, a pattern of sub-coils disposed over a coverage area (e.g., coverage area 501 in fig. 5) is shown in accordance with various embodiments. According to various embodiments, a portion of the detection coil 100 may be configured as the second channel. For example, among the sub-coils of the detection coil 100 (e.g., the sub-coil 300 in fig. 3A), the sub-coil located inside the coverage area 501 may be configured as a first channel (e.g., ch#1), and the sub-coil located outside the coverage area may be configured as a second channel (e.g., ch#2). According to various embodiments, sub-coils configured as the same channel may be connected (e.g., connected in series) with each other.

According to an embodiment, the filter capacitor (e.g., power adapter 221), control circuit 212 (or PWM circuit), or inverter (e.g., power generation circuit 222) may be configured as a second channel (e.g., ch#2). In this case, a part or all of the sub-coils constituting the detection coil 100 may be configured as a first channel (e.g., ch#1). According to an embodiment, two or more portions of the detection coil 100, the filter capacitor (e.g., the power adapter 221), the control circuit 212 (or the PWM circuit), or the inverter (e.g., the power generation circuit 222) may be configured as the second channel.

Referring to fig. 10B, a circuit diagram of a sensing circuit 215 is shown, in accordance with various embodiments.

According to various embodiments, the sensing circuit 215 may include a first compensation circuit 911 (e.g., compensation circuit 910 in fig. 9), a second compensation circuit 913 (e.g., compensation circuit 910 in fig. 9), and/or an amplification circuit 930. Hereinafter, an embodiment in which a portion of the detection coil 100 is configured as the second channel (e.g., ch#2) will be described.

According to various embodiments, the first compensation circuit 911 may receive the voltage of the detection coil 100 (e.g., the induced voltage V of the first channel (e.g., ch#1 in fig. 10A)) ₁ ) And based on a reference point value (e.g., induced voltage V of the second channel (e.g., ch#2 in fig. 10A)) ₂ ) Compensating the received voltage (e.g. induced voltage V of the first channel ₁ )。

According to various embodiments, the first compensation circuit 911 may include RC circuits 911a and 911d (e.g., low pass filters, LPFs), multipliers 911b and 911e, peak detectors 911c and 911f, and a normalization circuit 911g. The peak detector 911f may include a voltage divider including at least one resistor R ₁₀ And R is ₁₁ . The first compensation circuit 911 may further include a dummy load (dummy load) 911h, and the dummy load 911h may be implemented as a voltage divider including at least one resistor. For example, resistors R1, R9, and R18 may be configured to have 1kΩ, resistors R5 and R21 have 200kΩ, resistor R26 has 510kΩ, and the other resistors have 100kΩ. The capacitances C1, C4 and C7 can be configured to 1nF, the capacitances C2 and C5 to 10nF, and the capacitances C3, C6 and C8 to 100nF. The diodes D1 to D9 may be implemented as Schottky (Schottky) diodes.

According to various embodiments, when the first voltage of the first channel ch#1 (e.g., the induced voltage V ₁ ) When applied to RC filter 911a, can output a filtered voltage V ₁₁ . According to various embodiments, the output voltage V of the peak detector 911c ₁₂ May be input to normalization circuit 911g. For example, when an element of the circuit diagram has an element value according to the embodiment, the voltage V is output ₁₂ Can haveWith 2V ₁₁ Is a function of the amplitude of (a).

According to various embodiments, when V _cc When applied to dummy load 911h, voltage V _d May be output and input to normalization circuit 911g. According to various embodiments, the voltage V _d May be 1V, V having an amplitude that results in a 1V voltage being input to normalization circuit 911g _cc May be applied to dummy load 911h. According to various embodiments, when the second voltage of the second channel CH#2 (e.g., the induced voltage V ₂ ) When applied to RC circuit 911d (e.g., RC filter), the filtered voltage V may be output ₂₁ . According to various embodiments, the output voltage V of the peak detector 911f ₂₂ May be input to normalization circuit 911g. For example, output voltage V ₂₂ Can be obtained by equation 7. When an element of the circuit diagram has an element value according to the described embodiment, "a" may have a value of 2.

According to various embodiments, a voltage (e.g., V ₁₂ 、V _d And V ₂₂ ) May be input to normalization circuit 911g. According to various embodiments, the output voltage V of the normalization circuit 911g ₃ May be input to the second compensation circuit 913. For example, output voltage V ₃ Can be obtained by equation 8.

According to various embodiments, the output voltage V of the normalization circuit 911g ₃ Is a ratio of values calculated from voltages (e.g., induced voltages) of the two channels, and thus may have a value (e.g., a value that is not affected by fluctuation of Tx current) independent of fluctuation of current (e.g., tx current) input to the transmission coil (e.g., the conductive pattern 224 in fig. 2). For example, output voltage V ₃ May have an inverter (e.g., power generation circuit 22 in fig. 2) that is not subject to fluctuations from an external power source (e.g., system power source)2) Fluctuation of the input voltage of the inverter and/or the value of the operational influence of the inverter (e.g., the power generation circuit 222).

According to various embodiments, the second compensation circuit 913 may receive a voltage value (e.g., the induced voltage V) on the first channel ch#1 from the first compensation circuit 911 ₁ ) And voltage value (e.g. induced voltage V ₂ ) Voltage value of ratio (e.g., V ₃ ) And may be based on a correction value (e.g., V _EE ) To compensate for voltage values related to the received ratio (e.g., V ₃ )。

According to various embodiments, the second compensation circuit 913 may include a negative offset circuit 913a and a negative voltage selector 913b. According to various embodiments, the negative voltage selector 913b may input the correction value V to and from the control circuit (e.g., the control circuit 212 in fig. 2) to the negative offset circuit 913a _EE Corresponding voltage-V _neg . For example, the control circuit 212 may include a PWM circuit or control a PWM circuit disposed outside the control circuit 212. The negative voltage selector 913b may include an RC filter and an OP-amp. The PWM circuit included in the control circuit 212 or disposed outside the control circuit 212 may be connected to the negative voltage selector through at least one input/output terminal (e.g., general purpose input/output, GPIO). The control circuit 212 may input a PWM output (e.g., an output corresponding to a duty ratio of 50%) to the negative voltage selector 913b by using the PWM circuit. The RC filter of the negative voltage selector 913b may output a voltage (e.g., a DC voltage) having a magnitude corresponding to the PWM output, and the output voltage (e.g., the DC voltage) may be converted by the OP-amp of the negative voltage selector 913b and input to the negative offset circuit 913a. Thus, for example, a negative voltage-V in the range of 0V to 3.3V is included _neg Can be input to the negative offset circuit 913a from the negative voltage selector 913 b. According to various embodiments, the second compensation circuit 913 may be based on a negative voltage-V _neg To input and output voltage V ₃ Applying an offset, and outputting a voltage V to which the offset is applied ₄ . For example, offset applied voltage V ₄ Can be obtained by equation 9.

V ₄ ＝V ₃ -V _neg Equation 9

According to various embodiments, the amplifying circuit 930 may be based on a voltage value (e.g., an induced voltage V) of the first channel ch#1 output from the compensating circuit 910 (e.g., the second compensating circuit 913) ₁ ) And voltage value (e.g. induced voltage V ₂ ) To amplify the value (e.g., V ₄ ) To amplify the voltage value (e.g., V _ADC ) To the control circuit 212 (e.g., an ADC of the control circuit 212). For example, the amplifying circuit 930 may include at least one OP-amp (e.g., a ₈ ) And when the gain of the OP-amp (e.g., A ₈ ) Is G _A At this time, the output voltage V of the amplifying circuit 930 _ADC Can be obtained by equation 10. Equation 10 is obtained assuming that R25 and R26 have the same element value.

According to various embodiments, V in equation 10 _ADC Element values of elements that may have a circuit diagram and are based on a negative voltage V _neg Is used for the voltage value of the voltage control circuit.

According to various embodiments, when a foreign object (e.g., foreign object 2 in fig. 1A) is disposed on (or around) a region corresponding to the first channel ch#1, a voltage (e.g., induced voltage V) of the first channel ch#1 ₁ ) Fluctuation DeltaV occurs ₁ And the output value of the sensing circuit 215 (e.g., the amplifying circuit 930) can be obtained by equation 11.

According to various embodiments, the control circuit 212 may be based on a value (e.g., V in equation 10) that is preconfigured before the foreign object 2 is set _ADC ) In other words, the threshold value) and the output value of the sense circuit 215 (e.g., the amplifying circuit 930) (e.g., V 'in equation 11' _ADC ) The difference between them identifies the presence of foreign matter 2. For example, the control circuit 212 may monitor the sensing circuit 215 (e.g., dischargeLarge circuit 930), and when a value other than the preconfigured value (e.g., V) is output from the sense circuit 215 (e.g., the amplifying circuit 930) _ADC ) External values and/or outputs from the sense circuit 215 (e.g., the amplifying circuit 930) and preconfigured values (e.g., V _ADC ) When the difference is greater than or equal to the value of the specified amplitude, it can be recognized that the foreign matter 2 exists on (or around) the detection coil (for example, the detection coil 100 in fig. 2). When the presence of the foreign matter 2 is recognized, the control circuit 212 may not start the operation of wirelessly transmitting power to the wireless power receiver 250 and/or stop the operation of wirelessly transmitting power to the wireless power receiver 250. The control circuit 212 may output a notification (e.g., an alarm sound) through an output device (e.g., a speaker) of the wireless power transmitter 200 and/or control the wireless power receiver 250 to output a notification (e.g., an alarm sound) through an output device (e.g., a speaker). According to various embodiments, when a value (e.g., V _ADC ) When the difference of (a) falls within the error range (e.g., a difference less than a specified amplitude (e.g., 200 mV)), the control circuit 212 may identify that no foreign object 2 is present on (or around) the detection coil (e.g., detection coil 100 in fig. 2). When the presence of the foreign object 2 is not recognized, the control circuit 212 may start an operation of wirelessly transmitting power to the wireless power receiver 250 and/or maintain an operation of wirelessly transmitting power to the wireless power receiver 250.

According to an embodiment, the value (e.g., the second voltage) of the second channel ch#2 input to the RC circuit 911d may be replaced by a value (e.g., a DC oscillating voltage or an output voltage of a PWM circuit) sensed at an input terminal (e.g., an output terminal of a filter capacitor (e.g., the power adapter 221) or an output terminal of the control circuit 212) of an inverter (e.g., the power generation circuit 222). In this case, the RC circuit 911d may be replaced by a high-pass filter. According to an embodiment, the value (e.g., second voltage) of the second channel ch#2 input to the RC circuit 911d may be replaced by a value (e.g., tx current or Tx voltage) sensed at an output terminal (e.g., an input terminal of the detection coil 100) of the inverter (e.g., the power generation circuit 222).

According to an embodiment, a plurality of values of the second channel ch#2 may be configured. For example, each second channel may include a corresponding element (e.g., 911d, 911e, 911f, 911g, A2, and A3), and one of a voltage value of an output terminal of a filter capacitor (e.g., power adapter 221), a voltage value of an output terminal of control circuit 212, or a current value of an input terminal of detection coil 100 may be input as a value of each second channel (e.g., a value of an input terminal of an RC circuit corresponding to each second channel).

Fig. 11 illustrates an example of a sub-coil included in a detection coil, in accordance with various embodiments. According to an embodiment, the detection coil may have a stacked structure of a plurality of detection coils (e.g., detection coil 100 in fig. 1B), and each of the plurality of detection coils may include sub-coils (e.g., sub-coil 300 in fig. 3A) having a size different from each other. Fig. 11A and 11B may illustrate sub-coils included in the plurality of detection coils.

Referring to fig. 11A, according to various embodiments, a sub-coil (e.g., sub-coil 300 in fig. 3A) may include a first portion (e.g., first portion 301 in fig. 3A) having a regular triangle with a width (e.g., length in the x-axis direction) a and a length (or height) (e.g., length in the y-axis direction) h, and a second portion (e.g., second portion 303 in fig. 3A) having an inverted triangle.

Referring to fig. 11B, according to various embodiments, a sub-coil (e.g., sub-coil 300 in fig. 3A) may include a first portion (e.g., first portion 301 in fig. 3A) having a regular triangle with a width (e.g., length in the x-axis direction) a 'and a length (or height) (e.g., length in the y-axis direction) h', and a second portion (e.g., second portion 303 in fig. 3A) having an inverted triangle. According to an embodiment, the width a 'of the sub-coil shown in fig. 11B may be longer than the width a of the sub-coil shown in fig. 11A, and the length h' of the sub-coil shown in fig. 11B may be longer than the length h of the sub-coil shown in fig. 11A.

Fig. 11A and 11B show that the sub-coil has a triangular shape according to an embodiment, but the shape is not limited thereto, and may be a polygonal shape or a circular shape.

Fig. 12 illustrates an example of a detection coil including the sub-coil of fig. 11, according to various embodiments. According to an embodiment, fig. 12A may illustrate a detection coil (e.g., detection coil 100 in fig. 1B) including the sub-coil (e.g., sub-coil 300 in fig. 3A) illustrated in fig. 11A, and fig. 12B may illustrate a detection coil (e.g., detection coil 100 in fig. 1B) including the sub-coil (e.g., sub-coil 300 in fig. 3A) illustrated in fig. 11B.

Referring to fig. 12A, according to various embodiments, a detection coil 1210 (e.g., detection coil 100 in fig. 1B) may have a width (e.g., length in the X-axis direction) a and a length (or height) (e.g., length in the y-axis direction) B. According to an embodiment, the detection coil 1210 may include a sub-coil (e.g., sub-coil 300 in fig. 3A) shown in fig. 11A, including a first portion (e.g., first portion 301 in fig. 3A) having an equilateral triangle with a width (e.g., length in the x-axis direction) a and a length (or height) (e.g., length in the y-axis direction) h, and a second portion (e.g., second portion 303 in fig. 3A) having an inverted triangle.

Referring to fig. 12B, according to various embodiments, a detection coil 1220 (e.g., detection coil 100 in fig. 1B) may have a width (e.g., length in the X-axis direction) a and a length (or height) (e.g., length in the y-axis direction) B. According to an embodiment, the detection coil 1220 may include a sub-coil (e.g., sub-coil 300 in fig. 3A) shown in fig. 11B, including a first portion (e.g., first portion 301 in fig. 3A) having a regular triangle with a width (e.g., length in the x-axis direction) a 'and a length (or height) (e.g., length in the y-axis direction) h', and a second portion (e.g., second portion 303 in fig. 3A) having an inverted triangle.

According to an embodiment, when the detection coil 1210 shown in fig. 12A and the detection coil 1220 shown in fig. 12B have the same width and the same length, the number of sub-coils included therein may be different. For example, the width and length of the sub-coil included in the detection coil 1210 shown in fig. 12A are smaller than those of the sub-coil included in the detection coil 1220 shown in fig. 12B, and thus the number of sub-coils included in the detection coil 1210 shown in fig. 12A may be greater than that of the sub-coil included in the detection coil 1220 shown in fig. 12B.

Fig. 13 illustrates an example of a stacked structure of detection coils according to various embodiments. For example, fig. 13 may show a structure in which a detection coil 1210 (hereinafter referred to as a first detection coil 1210) shown in fig. 12A and a detection coil 1220 (hereinafter referred to as a second detection coil 1220) shown in fig. 12B are vertically stacked on each other without parallel movement or rotation.

According to an embodiment, referring to fig. 13, in the stacked structure, the zero line 1310 of the first detection coil 1210 and the zero line 1320 of the second detection coil 1220 have different numbers and do not overlap each other. For example, the zero line may be a line connecting the center of a zero region in which induced voltage fluctuations may not be detected because induced voltages generated at each portion are cancelled due to sub-coils including portions wound in different directions (e.g., portions 301 and 303 in fig. 3A).

In this way, the vertical stacking of the first and second detection coils 1210 and 1220 without parallel movement or rotation may reduce unnecessary detection coil area and reduce the difference between induced voltages of the two detection coils to prevent circuit saturation.

According to various embodiments, when the first detection coil 1210 and the second detection coil 1220 including unit coils of different sizes are stacked, zero lines of each detection coil do not overlap, and thus, a zero region where induced voltage fluctuation cannot be detected can be removed.

Furthermore, according to various embodiments, the removal of the zero region may increase the signal-to-noise ratio of the induced voltage fluctuations by signal amplification and reduce the complexity of the post-processing circuitry.

Fig. 14 is a diagram showing an arrangement of detection coils according to various embodiments. For example, fig. 14 is a diagram showing detection coils (e.g., circular coils) disposed on symmetrical conductive patterns. For example, FIG. 14A shows the placement of the detection coil in the x-y surface, and FIG. 14B shows a cross-sectional view taken along D-D' of FIG. 14A.

Referring to fig. 14A and 14B, a detection coil 1410 (e.g., the detection coil 100 of fig. 1B) may include a first detection coil 1420 and a second detection coil 1430, the first detection coil 1420 and the second detection coil 1430 include sub-coils of different sizes, and the first detection coil 1420 and the second detection coil 1430 may be vertically stacked one on another without being moved or rotated in parallel.

According to an embodiment, the detection coil 1410 may be disposed to cover the conductive pattern 224. For example, the detection coil 1410 may be disposed beyond the area of the conductive pattern 224 with respect to the x-y surface. For example, the detection coil 1410 may have the same width and length based on the conductive pattern 224 having a symmetrical shape.

According to an embodiment, each of the first detection coil 1420 and the second detection coil 1430 included in the detection coil 1410 may be disposed symmetrically with respect to the center of the conductive pattern 224.

According to an embodiment, the ferrite 1440, the conductive pattern 224, and the detection coil 1410 may be sequentially arranged. According to an embodiment, a shielding structure 1450 may also be included, and the shielding structure 1450 may be disposed on one side of the ferrite 1440. For example, the shielding structure 1450 may be disposed on a surface of the ferrite 1440 opposite to the surface on which the conductive pattern 224 is disposed.

In this way, since the first detection coil and the second detection coil include unit coils of different sizes, the zero line of each detection coil does not overlap each other, so that a zero region where induced voltage fluctuation cannot be detected can be removed, and each detection is symmetrical with respect to the center of the conductive pattern, so that the influence of the characteristics of the power transmitter or receiver and the arrangement environment can be reduced.

Fig. 15 is a diagram showing an arrangement of detection coils according to various embodiments. For example, fig. 15 is a diagram showing a detection coil (for example, DD coil) provided on an asymmetric conductive pattern. For example, FIG. 15A shows the arrangement of the detection coils in the x-y surface, FIG. 15B shows a cross-sectional view taken along E-E 'of FIG. 15A, and FIG. 15C shows a cross-sectional view taken along F-F' of FIG. 15A.

Referring to fig. 15A to 15C, a detection coil 1510 (e.g., the detection coil 100 in fig. 1B) may include a first detection coil 1520 and a second detection coil 1530, the first detection coil 1520 and the second detection coil 1530 include sub-coils of different sizes, and the first detection coil 1520 and the second detection coil 1530 may be vertically stacked with each other in parallel movement or rotation.

According to an embodiment, the detection coil 1510 may be disposed to cover the conductive pattern 224. For example, the detection coil 1510 may be disposed beyond the area of the conductive pattern 224 relative to the x-y surface. For example, the detection coil 1510 may have the same width and length based on the conductive pattern 224 having an asymmetric shape.

According to an embodiment, each of the first detection coil 1520 and the second detection coil 1530 included in the detection coil 1510 may be disposed symmetrically with respect to the center of the conductive pattern 224.

According to an embodiment, the ferrite 1540, the conductive pattern 224, and the detection coil 1510 may be sequentially arranged.

According to various embodiments, the detection coil may include a first sub-coil disposed on at least one surface of the first PCB and including a first portion and a second portion having one end connected to one end of the first portion and wound in a direction opposite to a direction in which the first portion is wound, and a second sub-coil disposed on at least one surface of the second PCB other than the first PCB and including a third portion and a fourth portion having one end connected to one end of the third portion and wound in a direction opposite to the direction in which the third portion is wound, wherein the first portion and the second portion may have polygonal shapes symmetrical to each other when viewed from one direction, the third portion and the fourth portion may have polygonal shapes symmetrical to each other when viewed from the other direction, the second portion may be disposed under the first portion, the fourth portion may be disposed under the third portion when viewed from the other direction, and the first and the sub-coils may be arranged to overlap each other when viewed from the other direction.

According to various embodiments, the first portion may be disposed on an upper surface of the first PCB, the second portion may be disposed on a lower surface of the first PCB, the third portion may be disposed on an upper surface of the second PCB, and the fourth portion may be disposed on a lower surface of the second PCB.

According to various embodiments, the first sub-coil may include a first region where the first portion and the second portion do not overlap when viewed from one direction, the second sub-coil may include a second region where the third portion and the fourth portion do not overlap when viewed from one direction, and the first sub-coil and the second sub-coil may be arranged such that at least a portion of the first region and the second region may not overlap each other when viewed from one direction.

According to various embodiments, the second sub-coil may be set to have a pre-configured angular difference with respect to the first sub-coil when viewed from one direction.

According to various embodiments, the second sub-coil may be arranged to have a pre-configured difference in distance with respect to the first sub-coil in a direction perpendicular or parallel to one direction when viewed from the one direction.

According to various embodiments, the first portion has one of a triangular shape or an inverted triangular shape, and the second portion has the other of a triangular shape or an inverted triangular shape.

According to various embodiments, the first sub-coil may be arranged such that the center of the first portion and the center of the second portion correspond to each other when viewed from one direction, an

The second sub-coil may be arranged such that the center of the third portion and the center of the fourth portion correspond to each other when viewed from one direction.

According to various embodiments, the detection coil may further include a third sub-coil disposed on at least one surface of the first PCB and having at least a portion overlapping the first sub-coil, wherein the third sub-coil may be disposed such that a fifth portion wound in the same direction as the first portion overlaps the first portion and a sixth portion wound in the same direction as the second portion overlaps the second portion when viewed from one direction.

According to various embodiments, the third sub-coil may be arranged such that the fifth portion does not overlap the second portion and the sixth portion does not overlap the first portion when viewed from one direction.

According to various embodiments, the fifth portion may be disposed on a different surface from the first portion among the plurality of surfaces of the first PCB, and the sixth portion may be disposed on a different surface from the second portion among the plurality of surfaces of the first PCB.

According to various embodiments, the third sub-coil may be connected to the first sub-coil by a fifth portion connected to the other end of the first portion or a sixth portion connected to the other end of the second portion.

According to various embodiments, the detection coil may include: a first portion having a first polygonal shape when viewed from one direction and wound along a first winding direction; and a second portion having one end connected to the first portion, having a second polygonal shape different from the polygonal shape of the first portion when viewed from one direction, and wound in a second winding direction opposite to the first winding direction, wherein the second portion may be disposed under the first portion when viewed from the other direction, and the second polygonal shape may have the same size as the first polygonal shape when viewed from one direction, and may be symmetrical with the first polygonal shape about one axis.

According to various embodiments, the first polygonal shape may be one of a triangular shape or an inverted triangular shape, and the second polygonal shape may be the other of a triangular shape or an inverted triangular shape.

According to various embodiments, the center of the first portion and the center of the second portion may correspond to each other when viewed from one direction.

According to various embodiments, the first portion and the second portion may be arranged such that they do not at least partially overlap each other when viewed from one direction.

According to various embodiments, the detection coil may further include a sub-coil connected to the other end of the second portion, wherein the sub-coil may be disposed such that a third portion wound in the same direction as the first portion overlaps the first portion and a fourth portion wound in the same direction as the second portion overlaps the second portion when viewed from one direction.

According to various embodiments, a wireless power transmitter may include a detection coil, a transmission coil configured to supply wireless power to at least one wireless power receiver, and a control circuit, wherein the detection coil may include a plurality of sub-coils, each of which may include: a first portion having a first polygonal shape and wound along a first winding direction when viewed from one direction, and a second portion having one end connected to one end of the first portion, having a second polygonal shape different from the first polygonal shape, wound along a second winding direction opposite to the first winding direction, and disposed under the first portion when viewed from the other direction, the second polygonal shape may have the same size as the first polygonal shape and may be symmetrical to the first polygonal shape about one axis when viewed from the one direction, and the control circuit may be configured to recognize the presence of a foreign object based on a value of a first voltage value of a first channel corresponding to a first sub-coil connected to each other and a second voltage value of a second channel corresponding to a second sub-coil connected to each other among the plurality of sub-coils during transmission of wireless power to the outside, and based on the obtained values.

According to various embodiments, the wireless power transmitter may further include a sensing circuit, wherein the sensing circuit may be configured to obtain the first voltage value and the second voltage value and provide a value based on a ratio of the first voltage value and the second voltage value to the control circuit.

According to various embodiments, the control circuit may be configured to identify the presence of a foreign object based on a difference between the provided ratio-based value and the threshold value.

According to various embodiments, the control circuit may be further configured to determine a correction value based on at least one of a presence of the at least one wireless power receiver, an arrangement of the at least one wireless power receiver, or an operating mode of the wireless power receiver, and to control the sensing circuit to apply the offset to the ratio based on the determined correction value.

According to various embodiments, the first and second portions included in the first sub-coil may have the same width and length, the third and fourth portions included in the second sub-coil may have the same width and length, and the first and third portions may have different widths and lengths.

According to various embodiments, the second sub-coil may be arranged without an angular difference with respect to the first sub-coil when seen from one direction.

According to various embodiments, the second sub-coil may be arranged without a distance difference with respect to the first sub-coil in a direction perpendicular or parallel to one direction when seen from the one direction.

It should be understood that the various embodiments of the disclosure and the terminology used therein are not intended to limit the technical features set forth herein to the particular embodiments, but rather include various modifications, equivalents or alternatives to the corresponding embodiments. With respect to the description of the drawings, like reference numerals may be used to identify like or related elements. The singular form of a noun corresponding to an item may include one or more items unless the context clearly dictates otherwise. As used herein, each of the phrases such as "a or B", "at least one of a and B", "at least one of a or B", "at least one of A, B or C", "at least one of A, B and C", and "at least one of A, B or C" may include all possible combinations of items listed together in a corresponding one of the phrases. As used herein, terms such as "first," "second," "first," and "second" may be used to simply distinguish one element from another element and not to otherwise limit the elements (e.g., importance or order). It will be understood that if an element (e.g., a first element) is referred to as being "coupled" to, "connected" to … … or "connected" to another element (e.g., a second element), whether or not the term "operatively" or "communicatively" is used, it is intended that the element can be directly (e.g., wired), wirelessly, or coupled/connected to the other element via a third element.

As used herein, the term "module" may include units implemented in hardware, software, or firmware, and may be used interchangeably with other terms such as "logic," logic block, "" component, "or" circuit. A "module" may be the smallest unit of a single integrated component adapted to perform one or more functions, or be part thereof. For example, according to an embodiment, a "module" may be implemented in the form of an Application Specific Integrated Circuit (ASIC).

The various embodiments set forth herein may be implemented as software (e.g., program 140) comprising one or more instructions stored on a storage medium (e.g., internal memory 136 or external memory 138) readable by a machine (e.g., electronic device 101). For example, a processor (e.g., processor 120) of a machine (e.g., electronic device 101) may invoke at least one of the one or more instructions stored in the storage medium and execute the one or more stored instructions. This allows the machine to be operated to perform at least one function in accordance with the at least one instruction invoked. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Wherein the term "non-transitory" merely means that the storage medium is a tangible device and does not include signals (e.g., electromagnetic waves), but the term does not distinguish between locations where data is semi-permanently stored in the storage medium and locations where data is temporarily stored in the storage medium.

According to an embodiment, a method according to various embodiments of the present disclosure may be included in a computer program product and provided therein. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium, such as a compact disk read only memory (CD-ROM), or via an application Store (e.g., a Play Store ^TM ) Online distribution (e.g., download or upload), or directly between two user devices (e.g., smartphones). If distributed online, at least a portion of the computer program product may be temporarily generated or at least temporarily stored in a machine-readable storage medium, such as a memory of a manufacturer's server, a server of an application store, or a relay server.

According to various embodiments, each of the elements (e.g., modules or programs) described above may include a single entity or multiple entities, and some of the multiple entities may be separately disposed in any other element. According to various embodiments, one or more of the above elements may be omitted, or one or more other elements may be added. Alternatively or additionally, multiple elements (e.g., modules or programs) may be integrated into a single element. In this case, according to various embodiments, the integrated element may still perform one or more functions of each of the plurality of elements in the same or similar manner as performed by a corresponding one of the plurality of elements prior to integration. According to various embodiments, operations performed by a module, a program, or another element may be performed sequentially, in parallel, repeatedly, or heuristically, or one or more operations may be performed in a different order or omitted, or one or more other operations may be added.

While the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to embrace such alterations and modifications that fall within the scope of the appended claims.

Claims

1. A detection coil, comprising:

a first sub-coil disposed on at least one surface of a first Printed Circuit Board (PCB) and including a first portion and a second portion, wherein the second portion includes one end connected to one end of the first portion and is wound in a direction opposite to a direction in which the first portion is wound; and

a second sub-coil disposed on at least one surface of the second PCB and including a third portion and a fourth portion, wherein the fourth portion includes one end connected to one end of the third portion and is wound in a direction opposite to a direction in which the third portion is wound,

wherein the first portion and the second portion are polygonal shapes symmetrical to each other when viewed from the first direction,

wherein the third portion and the fourth portion are polygonal shapes symmetrical to each other when viewed from the first direction,

wherein the second portion is disposed below the first portion when viewed from a second direction different from the first direction,

Wherein the fourth portion is disposed below the third portion when viewed from the second direction, an

Wherein the first sub-coil and the second sub-coil are arranged to partially overlap each other when viewed from the first direction.

2. The detection coil of claim 1, wherein:

the first portion is disposed on an upper surface of the first PCB;

the second part is arranged on the lower surface of the first PCB;

the third part is arranged on the upper surface of the second PCB; and

the fourth portion is disposed on a lower surface of the second PCB.

3. The detection coil of claim 1, wherein:

the first sub-coil includes a first region in which the first portion and the second portion overlap each other when viewed from the first direction;

the second sub-coil includes a second region in which the third portion and the fourth portion overlap when viewed from the first direction; and

the first and second sub-coils are arranged to at least partially not overlap each other when viewed from the first direction.

4. The detection coil of claim 1, wherein the second sub-coil is disposed at a pre-configured angle with respect to the first sub-coil when viewed from the first direction.

5. The detection coil of claim 1, wherein the second sub-coil is arranged to differ from the first sub-coil by a pre-configured distance in a direction perpendicular or parallel to the first direction when viewed from the first direction.

6. The detection coil of claim 1, wherein:

the first portion has a triangular shape or an inverted triangular shape; and

the second portion has the other of a triangular shape or an inverted triangular shape.

7. The detection coil of claim 1, wherein:

the first sub-coil is arranged such that a center of the first portion and a center of the second portion correspond to each other when viewed from the first direction; and

the second sub-coil is arranged such that a center of the third portion and a center of the fourth portion correspond to each other when viewed from the first direction.

8. The detection coil of claim 1, further comprising a third sub-coil disposed on at least one surface of the first PCB and at least partially overlapping the first sub-coil,

wherein the third sub-coil is arranged such that, when viewed from the first direction, a fifth portion wound in the same direction as the first portion overlaps the first portion, and a sixth portion wound in the same direction as the second portion overlaps the second portion.

9. The detection coil of claim 8, wherein the third sub-coil is arranged such that the fifth portion does not overlap the second portion and the sixth portion does not overlap the first portion when viewed from the first direction.

10. The detection coil of claim 8, wherein:

the fifth portion is disposed on a different surface from the first portion among the plurality of surfaces of the first PCB; and

the sixth portion is disposed on a surface different from a surface on which the second portion is disposed among the plurality of surfaces of the first PCB.

11. The detection coil according to claim 8, wherein the third sub-coil is connected to the first sub-coil through a fifth portion connected to the other end of the first portion or through a sixth portion connected to the other end of the second portion.

12. A detection coil, comprising:

a first portion formed in a first polygonal shape when viewed from a first direction and wound along a first winding direction; and

a second portion including one end connected to one end of the first portion and formed in a second polygonal shape different from the first polygonal shape,

wherein the second portion is wound in a second winding direction opposite to the first winding direction when viewed from the first direction, and the second portion is disposed below the first portion when viewed from the second direction, and

Wherein the second polygonal shape has the same size as the first polygonal shape when viewed from the first direction, and the second polygonal shape is symmetrical to the first polygonal shape about one axis.

13. The detection coil of claim 12, wherein the first polygonal shape is a triangular shape or an inverted triangular shape, and

the second polygonal shape is the other of a triangular shape or an inverted triangular shape.

14. The detection coil of claim 12, wherein a center of the first portion and a center of the second portion correspond to each other when viewed from the first direction.

15. The detection coil of claim 12, wherein the first portion and the second portion are arranged to at least partially not overlap each other when viewed from the first direction.