JP7680219B2 - Coil component and wireless power transmission device including same - Google Patents

Description

This disclosure relates to a coil component and a wireless power transmission device including the same.

Patent document 1 discloses an example in which a coil pattern for near field communication (NFC) and a coil pattern for wireless power transmission are formed on the surface of the same substrate.

JP 2018-113690 A

However, the coil component described in Patent Document 1 had a problem in that if a metal member was present near the antenna coil included in the counterpart device, communication using the NFC coil pattern became difficult.

Therefore, the present disclosure aims to provide a coil component that is capable of communication even when a metal member is present near an antenna coil included in a counterpart device, and a wireless power transmission device including the coil component.

A coil component according to one embodiment of the present disclosure includes a first coil pattern provided on a surface of a first substrate, a second coil pattern provided on the surface of the first substrate and disposed outside the first coil pattern, and a third coil pattern provided on the surface of the second substrate and coupled to the second coil pattern, and when viewed from the coil axis direction of the third coil pattern, a portion of the third coil pattern overlaps with the first coil pattern.

This disclosure makes it possible to provide a coil component that is capable of communication even when a metal member is present near the antenna coil included in the counterpart device, and a wireless power transmission device that includes the coil component.

FIG. 1 is a schematic cross-sectional view for explaining the structure of a coil component 1 according to an embodiment. FIG. 2 is a schematic plan view showing the shape of the conductor pattern formed on the front surface 11 of the first substrate 10. As shown in FIG. FIG. 3 is a schematic plan view showing the shape of the conductor pattern formed on the front surface 12 of the first substrate 10. As shown in FIG. FIG. 4 is a schematic plan view showing the shape of the conductor pattern formed on the front surface 22 of the second substrate 20. As shown in FIG. FIG. 5 is a schematic plan view showing the shape of the conductor pattern formed on the front surface 21 of the second substrate 20. As shown in FIG. FIG. 6 is a schematic diagram for explaining the effect of the third coil pattern CP3. FIG. 7 is a block diagram of a wireless power transmission device 90 using the coil component 1.

A preferred embodiment of the present disclosure will now be described in detail with reference to the accompanying drawings.

Figure 1 is a schematic cross-sectional view illustrating the structure of a coil component 1 according to one embodiment.

1, a coil component 1 according to one embodiment includes a first substrate 10 and a second substrate 20 made of a PET film or the like, a first coil pattern CP1 and a second coil pattern CP2 provided on the surfaces 11 and 12 of the first substrate 10, a magnetic suppression pattern M provided on the surface 21 of the second substrate 20, a third coil pattern CP3 and a fourth coil pattern CP4 provided on the surface 22 of the second substrate 20, and a magnetic body 30. The first coil pattern CP1 is a power transmission coil for wireless power transmission, and the second to fourth coil patterns CP2 to CP4 are antenna coils for NFC. The coil axis direction of the first to fourth coil patterns CP1 to CP4 is the z direction, and the first substrate 10, the second substrate 20, and the magnetic body 30 are arranged in this order so as to overlap in the z direction. In other words, the first substrate 10 is disposed between the second substrate 20 and the magnetic body 30, and the distance between the magnetic body 30 and the second substrate 20 in the z direction is greater than the distance between the magnetic body 30 and the first substrate 10 in the z direction.

Figure 2 is a schematic plan view showing the shape of the conductor pattern formed on the surface 11 of the first substrate 10.

As shown in FIG. 2, a spiral conductor pattern 100 constituting the first coil pattern CP1 and conductor patterns 41 and 42 constituting the second coil pattern CP2 are formed on the surface 11 of the first substrate 10.

The conductor pattern 100 constituting the first coil pattern CP1 is a six-turn configuration consisting of turns 110, 120, 130, 140, 150, and 160, with turn 110 located on the outermost periphery and turn 160 located on the innermost periphery. Of these, turns 110, 120, 130, 140, and 150 are radially divided into four by three spiral slits. Meanwhile, turn 160 is radially divided into two by one spiral slit. As a result, turn 110 is divided into four lines 111 to 114, turn 120 is divided into four lines 121 to 124, turn 130 is divided into four lines 131 to 134, turn 140 is divided into four lines 141 to 144, turn 150 is divided into four lines 151 to 154, and turn 160 is divided into two lines 161 and 162.

Lines 111, 121, 131, 141, 151, and 161 are continuous lines wound in a spiral shape for six turns, and are located on the outermost circumference of each turn. Lines 112, 122, 132, 142, 152, and 162 are continuous lines wound in a spiral shape for six turns, and are located on the second outermost circumference of each turn. Lines 113, 123, 133, 143, and 153 are continuous lines wound in a spiral shape for five turns, and are located on the second innermost circumference of each turn. Lines 114, 124, 134, 144, and 154 are continuous lines wound in a spiral shape for five turns, and are located on the innermost circumference of each turn.

The outer ends of lines 111 to 114 are commonly connected to terminal electrode E1. Meanwhile, the inner ends of lines 161, 162, 153, and 154 are respectively connected to through-hole conductors 301 to 304 that penetrate the first substrate 10.

The conductor patterns 41 and 42 constituting the second coil pattern CP2 are arranged outside the conductor pattern 100 constituting the first coil pattern CP1. Of these, the conductor pattern 41 is a continuous line wound about one turn, and the conductor pattern 100 is arranged in its opening area (inner diameter area). One end of the conductor pattern 41 is connected to the terminal electrode E3, and the other end of the conductor pattern 41 is connected to a through-hole conductor 43 that penetrates the first substrate 10. In addition, one end of the conductor pattern 42 is connected to the terminal electrode E4, and the other end of the conductor pattern 42 is connected to a through-hole conductor 44 that penetrates the first substrate 10.

Figure 3 is a schematic plan view showing the shape of the conductor pattern formed on the surface 12 of the first substrate 10, as viewed from the surface 11 side of the first substrate 10, that is, as viewed through the first substrate 10.

As shown in FIG. 3, a spiral conductor pattern 200 constituting the first coil pattern CP1 and a conductor pattern 45 constituting the second coil pattern CP2 are formed on the surface 12 of the first substrate 10. Note that in this embodiment, the surface 11 of the first substrate 10 is arranged facing the surface of the magnetic body 30, but the surface 12 of the first substrate 10 may be arranged facing the surface of the magnetic body 30.

The pattern shape of the conductor pattern 200 constituting the first coil pattern CP1 is the same as the pattern shape of the conductor pattern 100. The conductor pattern 200 is a six-turn configuration consisting of turns 210, 220, 230, 240, 250, and 260, with turn 210 located on the outermost periphery and turn 260 located on the innermost periphery. Of these, turns 210, 220, 230, 240, and 250 are radially divided into four by three spiral slits. On the other hand, turn 260 is radially divided into two by one spiral slit. As a result, turn 210 is divided into four parts, lines 211-214, turn 220 is divided into four parts, lines 221-224, turn 230 is divided into four parts, lines 231-234, turn 240 is divided into four parts, lines 241-244, turn 250 is divided into four parts, lines 251-254, and turn 260 is divided into two parts, lines 261 and 262.

Lines 211, 221, 231, 241, 251, and 261 are continuous lines wound in a spiral shape for six turns, and are located on the outermost circumference of each turn. Lines 212, 222, 232, 242, 252, and 262 are continuous lines wound in a spiral shape for six turns, and are located on the second outermost circumference of each turn. Lines 213, 223, 233, 243, and 253 are continuous lines wound in a spiral shape for five turns, and are located on the second innermost circumference of each turn. Lines 214, 224, 234, 244, and 254 are continuous lines wound in a spiral shape for five turns, and are located on the innermost circumference of each turn.

The outer ends of lines 211 to 214 are commonly connected to terminal electrode E2. Meanwhile, the inner ends of lines 261, 262, 253, and 254 are connected to through-hole conductors 304, 303, 302, and 301, respectively. As a result, four 11-turn lines are connected in parallel between terminal electrodes E1 and E2.

The conductor pattern 45 constituting the second coil pattern CP2 is a continuous line wound about one turn, and is arranged outside the conductor pattern 200 constituting the first coil pattern CP1. In other words, the conductor pattern 200 is arranged in the opening area (inner diameter area) of the conductor pattern 45. One end and the other end of the conductor pattern 45 are connected to the through-hole conductors 43 and 44, respectively. This makes the second coil pattern CP2 about two turns in total.

Figure 4 is a schematic plan view showing the shape of the conductor pattern formed on the surface 22 of the second substrate 20, as viewed from the surface 21 side of the second substrate 20, that is, as viewed through the second substrate 20.

As shown in FIG. 4, conductor patterns 51-56 constituting the third and fourth coil patterns CP3, CP4 and a capacitor electrode pattern CE1 are formed on the surface 22 of the second substrate 20. One end and the other end of the conductor pattern 51 are connected to through-hole conductors 61, 62, respectively, which penetrate the second substrate 20. One end and the other end of the conductor pattern 52 are connected to through-hole conductors 63, 64, respectively, which penetrate the second substrate 20. One end and the other end of the conductor pattern 53 are connected to through-hole conductors 65, 66, respectively, which penetrate the second substrate 20. One end and the other end of the conductor pattern 54 are connected to through-hole conductors 67, 68, respectively, which penetrate the second substrate 20. One end and the other end of the conductor pattern 55 are connected to through-hole conductors 69, 70, respectively, which penetrate the second substrate 20. One end of the conductor pattern 56 is connected to a through-hole conductor 71 that penetrates the second substrate 20, and the other end of the conductor pattern 56 is connected to the capacitor electrode pattern CE1.

Figure 5 is a schematic plan view showing the shape of the conductor pattern formed on the surface 21 of the second substrate 20.

As shown in FIG. 5, a magnetic suppression pattern M, conductor patterns 81-85, and a capacitor electrode pattern CE2 are formed on the surface 21 of the second substrate 20. Note that in this embodiment, the surface 21 of the second substrate 20 is arranged facing the surface 12 of the first substrate 10, but the surface 22 of the second substrate 20 may also be arranged facing the surface 12 of the first substrate 10.

The magnetic suppression pattern M includes a trunk line pattern Mx extending in the x direction and a plurality of branch line patterns My extending in the y direction. The trunk line pattern Mx and the plurality of branch line patterns My are each composed of a conductor pattern. A fixed potential such as a ground potential is applied to the magnetic suppression pattern M via a terminal electrode E5 connected to the trunk line pattern Mx. The plurality of branch line patterns My branch from the trunk line pattern Mx and extend in the y direction, and are arranged in the x direction. The tip portions of the plurality of branch line patterns My are open. In addition, the branch line patterns My are connected to each other via the trunk line pattern Mx, and are provided independently without being directly connected. Therefore, when a magnetic field in the z direction is applied to the magnetic suppression pattern M, a part of the magnetic field is applied to the branch line pattern My to generate an eddy current, but since the branch line pattern My does not form a loop-shaped pattern, no loss occurs due to the current generated by the magnetic field looping widely. Note that the x direction is an example of a first direction, and the y direction is an example of a second direction. Also, the trunk line pattern Mx is an example of a first conductor pattern, and the multiple branch line patterns My are an example of multiple second conductor patterns. In addition, in this embodiment, the magnetic suppression pattern M has multiple branch line patterns My each connected to the trunk line pattern Mx, but is not limited to this as long as it is a pattern that reduces radiation noise.

One end and the other end of the conductor pattern 81 are connected to the through-hole conductors 62 and 63, respectively. One end and the other end of the conductor pattern 82 are connected to the through-hole conductors 64 and 65, respectively. One end and the other end of the conductor pattern 83 are connected to the through-hole conductors 66 and 67, respectively. One end and the other end of the conductor pattern 84 are connected to the through-hole conductors 68 and 69, respectively. One end and the other end of the conductor pattern 85 are connected to the through-hole conductors 70 and 71, respectively. The capacitor electrode pattern CE2 is connected to the through-hole conductor 61. These conductor patterns 81 to 85 and the capacitor electrode pattern CE2 are not in contact with the magnetic suppression pattern M, and the branch line pattern My is removed in the positions where the conductor patterns 81 to 85 and the capacitor electrode pattern CE2 are present.

With this configuration, the conductor patterns 51 to 56 shown in FIG. 4 are wound about three turns through the conductor patterns 81 to 85. Two turns with a coil opening width (coil diameter) of D3a or D3b in the y direction constitute the third coil pattern CP3, and one turn with a coil opening width (coil diameter) of D4 in the y direction constitutes the fourth coil pattern CP4, and both are connected in series. The fourth coil pattern CP4 is arranged outside the third coil pattern CP3. In other words, the third coil pattern CP3 is arranged in the opening region (inner diameter region) of the fourth coil pattern CP4. The third coil pattern CP3 is composed of a part of the conductor pattern 51 and the conductor patterns 52, 53, and 55. The fourth coil pattern CP4 is composed of the remaining part of the conductor pattern 51 and the conductor patterns 54 and 56. In the third coil pattern CP3, the interval S between the turn with the coil diameter D3a and the turn with the coil diameter D3b is wider than the pattern width W.

In the section CP3y extending in the y direction, the third coil pattern CP3 overlaps in the z direction with the second coil pattern CP2 formed on the first substrate 10 (i.e., the x-direction positions are the same), or the difference in x-direction positions is slight. As a result, the third coil pattern CP3 is coupled to the second coil pattern CP2 mainly in this section CP3y. On the other hand, the fourth coil pattern CP4 has approximately the same size and approximately the same pattern shape as the second coil pattern CP2, so most of the section overlaps with the second coil pattern CP2. As a result, the fourth coil pattern CP4 is coupled to the second coil pattern CP2 more strongly than the third coil pattern CP3. Note that the same size and the same pattern shape also include cases where the second coil pattern CP2 and the fourth coil pattern CP4 vary due to manufacturing errors or tolerances.

The fourth coil pattern CP4 is approximately the same size as the second coil pattern CP2 and has approximately the same pattern shape, so that the fourth coil pattern CP4 is disposed outside the first coil pattern CP1 when viewed from the z direction. In contrast, the third coil pattern CP3 overlaps with the first coil pattern CP1 in most sections when viewed from the z direction. That is, when viewed from the coil axis direction of the third coil pattern CP3, a part of the third coil pattern CP3 overlaps with the first coil pattern CP1. In FIG. 2, the planar position of a part of the third coil pattern CP3 when the substrates 10 and 20 are overlapped is shown by a dashed line. As shown in FIG. 2, the third coil pattern CP3 has a part located inside the outer edge of the first coil pattern CP1 and a part located outside the outer edge of the first coil pattern CP1 when viewed from the coil axis direction of the third coil pattern CP3. The portion of the third coil pattern CP3 that is located outside the outer edge of the first coil pattern CP1 is the portion that has the least interference with the first coil pattern CP1.

The capacitor electrode patterns CE1 and CE2 face each other through the second substrate 20 to form a second capacitor C2 (see FIG. 7). The second capacitor C2, which is made up of the capacitor electrode patterns CE1 and CE2, is connected in series to the third and fourth coil patterns CP3 and CP4. The resonant frequencies of the third and fourth coil patterns CP3 and CP4 can be adjusted by the areas of the capacitor electrode patterns CE1 and CE2. The capacitor electrode patterns CE1 and CE2 overlap the pattern area of the first coil pattern CP1 when viewed from the z direction. That is, the second capacitor C2 is provided on the surface of the second substrate 20 so as to overlap the pattern area of the first coil pattern CP1 when viewed from the coil axis direction of the first coil pattern CP1. The pattern area of the first coil pattern CP1 is an area in which the conductor pattern constituting the first coil pattern CP1 exists in a plan view, and the direction (radial direction) perpendicular to the extension direction (circumferential direction) of the conductor pattern is the winding width of the pattern area.

In this way, by arranging the capacitor electrode patterns CE1 and CE2 at positions overlapping with the pattern area of the first coil pattern CP1, the magnetic flux generated from the first coil pattern CP1 is less likely to be applied to the capacitor electrode patterns CE1 and CE2, and eddy currents are suppressed. In particular, it is preferable to arrange the capacitor electrode patterns CE1 and CE2 offset outward from the center position of the winding width of the pattern area of the first coil pattern CP1. In other words, it is preferable that the second capacitor C2 is arranged offset outward from the center position of the winding width of the pattern area of the first coil pattern CP1 when viewed from the coil axis direction of the first coil pattern CP1. This is because the magnetic flux density of the magnetic flux generated from the first coil pattern CP1 is highest in the opening area, and therefore eddy currents can be effectively reduced by arranging the capacitor electrode patterns CE1 and CE2 at positions as far away from the opening area as possible.

Unlike the first and second coil patterns CP1, CP2, the third and fourth coil patterns CP3, CP4 do not have terminal electrodes for external connection, and form a closed circuit completed by the conductor patterns formed on the surfaces 21, 22 of the second substrate 20. The third and fourth coil patterns CP3, CP4 function as a relay antenna by coupling with the second coil pattern CP2. In other words, in this embodiment, communication by NFC is realized by the main antenna consisting of the second coil pattern CP2 and the relay antenna consisting of the third and fourth coil patterns CP3, CP4.

Here, the resonant frequencies of the main antenna and the relay antenna are designed to sandwich the wireless communication frequency by NFC. In other words, if the wireless communication frequency by NFC is 13.56 MHz, the resonant frequency of one of the main antenna and the relay antenna is less than 13.56 MHz, and the resonant frequency of the other of the main antenna and the relay antenna is greater than 13.56 MHz. Here, when the wireless communication frequency by NFC is 13.56 MHz, it is preferable that the difference between the resonant frequency of the main antenna and the resonant frequency of the relay antenna is 7 MHz or more, and it is preferable that the difference between the resonant frequency of one of the main antenna and the relay antenna and the wireless communication frequency is 1 MHz or less. As a first example, the resonant frequency of the main antenna can be designed to be 21.36 MHz, and the resonant frequency of the relay antenna can be designed to be 13.48 MHz. As a second example, the resonant frequency of the main antenna can be designed to be 21.00 MHz, and the resonant frequency of the relay antenna can be designed to be 13.16 MHz. As a third example, the resonant frequency of the main antenna can be designed to be 12.78 MHz, and the resonant frequency of the relay antenna can be designed to be 20.76 MHz. This makes it possible to ensure a sufficient communication distance.

Figure 6 is a schematic diagram illustrating the effect of the third coil pattern CP3.

As shown in FIG. 6, when the coil component 1 according to this embodiment and the counterpart device 2 with which it communicates are placed opposite each other across a space 3, the magnetic flux φ1 generated by the second to fourth coil patterns CP2 to CP4 interlinks with the coil pattern CP5 included in the counterpart device 2, thereby achieving wireless communication by NFC. A signal to be wirelessly communicated is supplied to the second coil pattern CP2 via the terminal electrodes E3 and E4. The second coil pattern CP2, which is the main antenna, is mainly coupled to the fourth coil pattern CP4, as indicated by the symbol A in FIG. 6. As a result, a signal is also supplied to the third and fourth coil patterns CP3 and CP4, which are relay antennas.

Here, if the metal member 4 is present on the back side of the coil pattern CP5, the magnetic flux φ1 extending in the z direction is hindered, and the magnetic flux φ1 spreads in the xy plane direction. However, the coil component 1 according to this embodiment is arranged closer to the counterpart device 2 than the second coil pattern CP2, and has a third coil pattern CP3 with a smaller coil diameter than the second coil pattern CP2, so that the spread of the magnetic flux φ1 in the xy plane direction is suppressed, and as a result, the magnetic flux φ1 is more likely to extend in the z direction. The fact that the third coil pattern CP3 is closer to the counterpart device 2 than the second coil pattern CP2 means that the third coil pattern CP3 is farther from the magnetic body 30 than the second coil pattern CP2. The magnetic flux φ2 shown by the dashed line in FIG. 6 indicates the magnetic flux when the third coil pattern CP3 is omitted. As shown by the magnetic flux φ2, when the third coil pattern CP3 is omitted, the magnetic field component interlinked with the coil pattern CP5 is reduced.

The first coil pattern CP1, which is a power transmission coil for wireless power transmission, is coupled to the coil pattern CP6 included in the counterpart device 2. The coil pattern CP6 is a power receiving coil for wireless power transmission. Most of the magnetic flux generated by the first coil pattern CP1 is interlinked with the coil pattern CP6, which is a power receiving coil. However, a part of the magnetic flux generated from the first coil pattern CP1 is not interlinked with the coil pattern CP6 and is radiated to the surroundings as radiation noise. Such radiation noise may cause the surrounding electronic devices to malfunction, so it is desirable to suppress it as much as possible. And, since the coil component 1 according to this embodiment is provided with the magnetic suppression pattern M, radiation noise is reduced. Moreover, since the magnetic suppression pattern M is formed on the surface of the second substrate 20 on which the third and fourth coil patterns CP3 and CP4 are formed, the number of parts is not increased.

In this way, the coil component 1 according to this embodiment constitutes both a power transmission coil for wireless power transmission and an antenna coil for NFC by the conductor patterns formed on the surfaces of the substrates 10 and 20, making it possible to reduce the number of components. Furthermore, since the antenna coil for NFC includes the third coil pattern CP3, it is possible to ensure a sufficient communication distance even if a metal member 4 is present on the back side of the coil pattern CP5 of the counterpart device 2.

Figure 7 is a block diagram of a wireless power transmission device 90 using the coil component 1 according to this embodiment.

The wireless power transmission device 90 shown in FIG. 7 includes a coil part 1 having first to fourth coil patterns CP1 to CP4, a communication circuit 91 connected to the second to fourth coil patterns CP2 to CP4, and a power transmission circuit 92 connected to the first coil pattern CP1. The communication circuit 91 and the power transmission circuit 92 are connected to a control circuit 93. As a result, data transmitted and received via a communication line 94 can be communicated via the second to fourth coil patterns CP2 to CP4 for NFC, and power supplied by a power source 95 can be wirelessly transmitted via the first coil pattern CP1 for wireless power transmission.

As shown in FIG. 7, a second capacitor C2 is connected to the third and fourth coil patterns CP3 and CP4, and a first capacitor C1 is connected to the second coil pattern CP2. In FIG. 7, the first capacitor C1 is connected in parallel to the second coil pattern CP2, but instead of or in addition to this, the first capacitor C1 may be connected in series to the second coil pattern CP2.

Although the above describes preferred embodiments of the present disclosure, the present disclosure is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the present disclosure, and it goes without saying that these modifications are also included within the scope of the present disclosure.

The technology disclosed herein includes, but is not limited to, the following configuration examples:

The coil component according to the present disclosure comprises a first coil pattern provided on the surface of a first substrate, a second coil pattern provided on the surface of the first substrate and arranged outside the first coil pattern, and a third coil pattern provided on the surface of the second substrate and coupled to the second coil pattern, and when viewed from the coil axis direction of the third coil pattern, a portion of the third coil pattern overlaps with the first coil pattern.

With this configuration, the first coil pattern is used as a power transmission coil for wireless power transmission, and the second and third coil patterns are used as antenna coils for communication, making communication possible even when a metal member is present near the antenna coil included in the other device.

The coil component according to the present disclosure may further include a fourth coil pattern provided on the surface of the second substrate and arranged outside the third coil pattern. This makes it possible to couple the second coil pattern and the fourth coil pattern. In this case, if the second coil pattern and the fourth coil pattern are the same size, it is possible to further enhance the coupling between the two. In addition, the third coil pattern and the fourth coil pattern may be connected. In this way, a relay antenna is formed by the third coil pattern and the fourth coil pattern.

Furthermore, the second coil pattern is connected to the first capacitor to form a first resonant circuit, and the third and fourth coil patterns are connected to the second capacitor to form a second resonant circuit, and the difference between the resonant frequency of the first resonant circuit and the resonant frequency of the second resonant circuit may be 7 MHz or more, and the difference between the wireless communication frequency of one of the resonant frequencies of the first resonant circuit and the resonant frequency of the second resonant circuit may be 1 MHz or less. This makes it possible to extend the communication distance. In this case, the second capacitor may be provided on the surface of the second substrate so as to overlap the pattern area of the first coil pattern when viewed from the coil axis direction of the first coil pattern. This makes it possible to suppress eddy currents. Furthermore, in this case, the second capacitor may be disposed offset outward from the center position of the winding width of the pattern area of the first coil pattern when viewed from the coil axis direction of the first coil pattern. This further suppresses eddy currents.

The third coil pattern may have a portion located inside the outer edge of the first coil pattern and a portion located outside the outer edge of the first coil pattern when viewed from the coil axis direction of the third coil pattern. This can increase the communication distance.

The third coil pattern may be wound with multiple turns and may have portions where the spacing between turns is greater than the pattern width. This can increase the communication distance.

The coil component according to the present disclosure may further include a magnetic suppression pattern provided on the surface of the second substrate, the magnetic suppression pattern including a first conductor pattern extending in a first direction, and a plurality of second conductor patterns extending in a second direction different from the first direction and arranged in the first direction. This can reduce radiation noise generated by the first coil pattern.

The wireless power transmission device according to the present disclosure includes the coil component, a power transmission circuit connected to the first coil pattern, and a communication circuit connected to the second coil pattern. This makes it possible to provide a wireless power transmission device that is capable of communication even when a metal member is present near the antenna coil included in the counterpart device.

1 Coil component 2 Counterpart device 3 Space 4 Metal member 10 First substrate 11, 12 Surface of first substrate 20 Second substrate 21, 22 Surface of second substrate 30 Magnetic body 41, 42, 45 Conductor pattern 43, 44 Through-hole conductor 51 to 56 Conductor pattern 61 Through-hole conductor 61 to 71 Through-hole conductor 81 to 85 Conductor pattern 90 Wireless power transmission device 91 Communication circuit 92 Power transmission circuit 93 Control circuit 94 Communication line 95 Power source 100, 200 Conductor pattern 110, 120, 130, 140, 150, 160, 210, 220, 230, 240, 250, 260 Turns 111-114, 121-124, 131-134, 141-144, 151-154, 161, 162, 211-214, 221-224, 231-234, 241-244, 251-254, 261, 262 Lines 301-304 Through-hole conductors CE1, CE2 Capacitor electrode pattern CP3y Sections CP5, CP6 Coil patterns E1-E5 Terminal electrode M Magnetic suppression pattern Mx Trunk line pattern My Branch line pattern S Spacing W Pattern widths φ1, φ2 Magnetic flux

Claims (8)

a first coil pattern provided on a surface of a first substrate;
a second coil pattern provided on a surface of the first base material and disposed outside the first coil pattern;
a third coil pattern provided on a surface of a second substrate and coupled to the second coil pattern;
a fourth coil pattern provided on a surface of the second base material and disposed outside the third coil pattern ,
When viewed from a coil axis direction of the third coil pattern, a portion of the third coil pattern overlaps with the first coil pattern,
the fourth coil pattern is coupled to the second coil pattern;
the third coil pattern and the fourth coil pattern are connected,
the second coil pattern is connected to a first capacitor to form a first resonant circuit;
the third and fourth coil patterns are connected to a second capacitor to form a second resonant circuit;
The second capacitor is provided on a surface of the second base material so as to overlap a pattern region of the first coil pattern when viewed from a coil axis direction of the first coil pattern . The coil component according to claim 1 , wherein the second coil pattern and the fourth coil pattern are the same size. a difference between a resonant frequency of the first resonant circuit and a resonant frequency of the second resonant circuit is 7 MHz or more;
3 . The coil component according to claim 1 , wherein a difference between a resonant frequency of the first resonant circuit and a wireless communication frequency of one of the first resonant circuit and the second resonant circuit is 1 MHz or less. 4. The coil component according to claim 1 , wherein the second capacitor is arranged offset outward from a center position of a winding width of a pattern area of the first coil pattern when viewed from a coil axis direction of the first coil pattern. 5. The coil component according to claim 1, wherein the third coil pattern has a portion located inside an outer edge of the first coil pattern and a portion located outside an outer edge of the first coil pattern when viewed from a coil axis direction of the third coil pattern. The coil component according to claim 1 , wherein the third coil pattern is wound by a plurality of turns and has a portion in which the interval between the turns is larger than the pattern width. 7. The coil component according to claim 1, further comprising a magnetic restraining pattern provided on a surface of the second substrate, the magnetic restraining pattern including a first conductor pattern extending in a first direction, and a plurality of second conductor patterns extending in a second direction different from the first direction and arranged in the first direction. The coil component according to any one of claims 1 to 7 ,
a power transmission circuit connected to the first coil pattern;
A wireless power transmission device comprising: a communication circuit connected to the second coil pattern.

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