coil structure

Abstract

This provides a coil structure applicable to the field of wireless charging. [Solution] A conductor provided on the circuit board, comprising a circuit board, a coil of multiple turns formed by winding around a center point, an input terminal connected to one of the outermost layers of the coil of multiple turns, an output terminal connected to one of the innermost layers of the coil of multiple turns and extending beyond each of the remaining turns of the coil, and a plurality of first capacitor structures provided on each of the coils of multiple turns, wherein the distance between the first capacitor structure and the output terminal is smaller than the distance between the first capacitor structure and the input terminal, and the first capacitor structure is a coil structure that does not overlap with the output terminal.

Description

Technical Field

[0001] The present disclosure relates to a coil structure, and more particularly to a coil structure provided with a capacitor structure within the coil.

Background Art

[0002] In the field of wireless charging, electromagnetic resonance is a common technical principle. A wireless charging system applying electromagnetic resonance usually consists of two parts: a transmitting end and a receiving end. Both the transmitting end and the receiving end utilize a coil structure to transmit electromagnetic energy and further achieve the purpose of charging.

Summary of the Invention

Problems to be Solved by the Invention

[0003] How to reduce the energy loss of the coil structure and improve the magnetic field strength of the coil structure to enhance the electromagnetic energy transmission between the transmitting end and the receiving end is an important issue for those skilled in the art to address.

Means for Solving the Problems

[0004] The present disclosure is a coil structure applied in the field of wireless charging, including a circuit board, a multi-turn coil formed by winding around a center point, an input terminal connected to one of the outermost layers of the multi-turn coil, an output terminal connected to one of the innermost layers of the multi-turn coil and passing over the rest of the multi-turn coil, and a plurality of first capacitor structures provided for each of the multi-turn coils, and further includes a conductor provided on the circuit board. The distance between the first capacitor structure and the output terminal is smaller than the distance between the first capacitor structure and the input terminal, and the first capacitor structure provides a coil structure that does not overlap with the output terminal.

[0005] In some embodiments, a first gap is formed in each of the multiple-turn coils, the multiple first capacitor structures are formed through the first gaps, and the multiple first capacitor structures and the multiple-turn coils are integrally molded.

[0006] In some embodiments, the multiple first capacitor structures in the multi-turn coil are aligned along a first direction.

[0007] In some embodiments, the plurality of first capacitor structures all have the same capacitance value.

[0008] In some embodiments, the plurality of first capacitor structures have different capacitance values.

[0009] In some embodiments, each of the plurality of first capacitor structures includes a plurality of first extension arms and a plurality of second extension arms, the plurality of first extension arms extending from a first side of the first gap and the plurality of second extension arms extending from a second side of the first gap, each of the plurality of first extension arms being separated by a first interval from a corresponding one of the plurality of second extension arms, the lengths of the plurality of first extension arms and the lengths of the plurality of second extension arms are both smaller than the distance from the first side to the second side of the first gap, and each of the plurality of first extension arms and each of the plurality of second extension arms are arranged in an intersecting manner.

[0010] In some embodiments, the circuit board is provided on a first plane, and each of the plurality of first extension arms and each of the plurality of second extension arms are provided intersecting in the first plane.

[0011] In some embodiments, the circuit board is provided on a first plane, and the plurality of first extension arms and the plurality of second extension arms are provided intersecting in a second direction perpendicular to the first plane.

[0012] In some embodiments, the widths of the multiple first intervals are all different.

[0013] In some embodiments, each of the plurality of first capacitor structures includes a plurality of first extension arms and a plurality of second extension arms, wherein the plurality of first extension arms extend from a first side of the first gap, the plurality of second extension arms extend from a second side of the first gap, there is a first spacing between each of the plurality of first extension arms, there is a first spacing between each of the plurality of second extension arms, each of the plurality of first extension arms is separated by a second spacing from a corresponding one of the plurality of second extension arms, and the two adjacent second spacings are not aligned in the first direction.

[0014] In some embodiments, the conductor further includes a plurality of additional capacitor structures, each connected in parallel to each corresponding of the plurality of first capacitor structures.

[0015] In some embodiments, the plurality of additive capacitor structures each form a second gap, and the plurality of first capacitor structures, the plurality of additive capacitor structures, and the plurality of turn coils are integrally molded.

[0016] In some embodiments, each of the plurality of additional capacitor structures includes a plurality of first extension arms and a plurality of second extension arms, wherein the plurality of first extension arms extend from the first side of the second gap and the plurality of second extension arms extend from the second side of the second gap, and the plurality of first extension arms and the plurality of second extension arms are arranged to intersect. [Effects of the Invention]

[0017] To sum up, when performing wireless charging operations, the electric field strength in the coil structure of the present disclosure can be reduced, and further, the floating electric field caused by the parasitic capacitor can be suppressed, the temperature rise of the coil structure can be reduced, the stability of the magnetic field can be improved, and the energy transmission efficiency of the transmitting end and the receiving end of the wireless charging device can be improved. Therefore, the wireless charging device including the coil structure can have high charging efficiency.

Brief Description of the Drawings

[0018] [Figure 1A] It is a schematic diagram of a coil structure according to an embodiment of the present disclosure. [Figure 1B] It is a schematic diagram of a conductor according to an embodiment of the present disclosure. [Figure 2A] It is a schematic diagram of a conductor according to an embodiment of the present disclosure. [Figure 2B] It is a schematic diagram of a capacitor structure according to an embodiment of the present disclosure. [Figure 2C] It is a schematic diagram of a capacitor structure according to an embodiment of the present disclosure. [Figure 2D] It is a schematic diagram of a capacitor structure according to an embodiment of the present disclosure. [Figure 3] It is a schematic diagram of a coil structure according to an embodiment of the present disclosure. [Figure 4A] It is a schematic diagram of a capacitor structure and an additional capacitor structure according to an embodiment of the present disclosure. [Figure 4B] It is a schematic diagram of a capacitor structure and an additional capacitor structure according to an embodiment of the present disclosure.

Modes for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present disclosure will be described in conjunction with the relevant drawings. In the drawings, the same reference numerals indicate the same or similar elements or method flows.

[0020] Please refer to FIGS. 1A and 1B. FIG. 1A is a schematic diagram of a coil structure 100 according to an embodiment of the present disclosure, and FIG. 1B is a schematic diagram of a conductor 120 according to an embodiment of the present disclosure.

[0021] The coil structure 100 may be provided in a wireless charging device. The wireless charging device can be used for wireless charging of any related electrical equipment that requires power transmission, such as an automated guided vehicle (AGV) or an unmanned aerial vehicle (UAV), either rail-mounted or non-rail-mounted. The wireless charging device and the automated vehicle are preferably used in special environments where personnel cannot easily reach, such as deep sea, desert or vacuum environments. This reduces the proportion of personnel exposed to danger and eliminates the need for personnel to directly operate a wired connection device to meet the charging requirements of electrical equipment. Instead, the device automatically moves within the charging range to meet the requirements of a fully automated environment and enables the equipment to continue automated operation without interruption. Further, the wireless charging device can use the coil structure 100 to perform energy transmission to a target object (e.g., the above AGV) in the form of electromagnetic resonance. In some embodiments, the wireless charging device can achieve the above magnetic resonance charging with a resonance frequency of 6.78 MHz.

[0022] Specifically, the principle of electromagnetic resonance wireless charging technology is to make both the power transmission end (e.g., the coil structure 100) and the reception end (e.g., the charging coil built into the above AGV) have resonant coils tuned to the same resonance frequency, and to perform energy transmission through a magnetic resonance coupling mechanism without physical contact, thereby improving the efficiency of wireless charging at medium and long distances.

[0023] The coil structure 100 of the present disclosure may be provided at the transmission end or the reception end of a wireless charging device. The coil structure 100 is composed of a circuit board 110 and a conductor 120. The circuit board 110 may be a fixed medium such as a printed circuit board (PCB). The conductor 120 is wound around a certain position (e.g., the center point CEN1 in FIG. 1A) to form a multi-turn coil, and the position of the multi-turn coil can be fixed through the circuit board 110.

[0024] The shape of the conductor 120 may be any shape, such as circular, square, or octagonal, and may be adjusted and changed according to the requirements of different usage situations. The number of turns of the coil is also not limited (the number of turns of the coil may be different, such as 4 turns, 8 turns, 16 turns, or 32 turns). The reason why the conductor 120 in Figure 1A is square and has coils 120_1 to 120_4 is to make the arrangement of the coil structure 100 easier to understand, and does not mean that the conductor 120 must necessarily be square, nor is the number of turns of the conductor 120 limited to 4. The conductor 120 may include an input terminal IT1 and an output terminal OT1. The input terminal IT1 and the output terminal OT1 are connected to both ends of the conductor 120, respectively, so that current flows through the multi-turn coil of the conductor 120. The input terminal IT1 may be connected to one end of the multi-turn coil (for example, one of the outermost layers of the multi-turn coil). The output terminal OT1 may be connected to the other end of a multi-turn coil (for example, one of the outermost layers of a multi-turn coil).

[0025] In some embodiments, as shown in Figure 1A, the input terminal IT1 is connected to coil 120_4 and extends along the first direction D1. In some embodiments, the output terminal OT1 is connected to coil 120_1 and extends along the first direction D1, crossing below coils 120_1 to 120_4 and over the multiple turns of coil, or extends outward from the innermost coil to the outermost coil.

[0026] In some other embodiments, as shown in Figure 1B, the input terminal IT1 is connected to coil 120_4 and extends along a second direction D2 perpendicular to a first direction D1. In the above embodiments, the output terminal OT1 is connected to coil 120_1 and similarly extends along a second direction D2. Assuming that coils 120_1 to 120_4 are located in a first plane in space, the second direction D2 may be considered perpendicular to the first plane.

[0027] In other embodiments, the input terminal IT1 extends along a first direction D1, and the output terminal OT1 extends along a second direction D2 (not shown). Each of the multiple turns of the conductor 120 coil may be provided with at least one capacitor structure. As shown in the embodiment of Figure 1A, coils 120_1 to 120_4 may each be provided with first capacitor structures C1 to C4. Each of coils 120_1 to 120_4 may have at least one dielectric material, such as paper, nylon, polystyrene, Teflon®, ceramic, silicon, or silicon oil. If the dielectric material is a non-solid or non-liquid substance such as air, a gap may be formed in the coil, and the first capacitor structures C1 to C4 can be formed in the corresponding gap. The first capacitor structures C1 to C4 and coils 120_1 to 120_4 are integrally molded.

[0028] As shown in Figure 1A, the first capacitor structures C1 to C4 may be aligned along the first direction D1. The distance between the first capacitor structures C1 to C4 and the output terminal OT1 is smaller than the distance between the first capacitor structures C1 to C4 and the input terminal IT1, and the positions on the coils of the first capacitor structures C1 to C4 do not overlap with the positions where the output terminal OT1 extends from each winding coil.

[0029] When current flows through the coil structure 100, in this invention, the first capacitor structures C1 to C4 are arranged between coils 120_1 to 120_4, thereby effectively reducing the coupling effect of parasitic capacitors between coil units, further suppressing stray electric fields caused by parasitic capacitors, significantly reducing the overall electric field strength of the coil structure 100, and achieving electric field concentration and uniformity of electric field distribution. Furthermore, the first capacitor structures C1 to C4, together with the coil units, form an inductance capacitance resonant (LC resonant) circuit, giving the coil structure 100 a high quality factor (Q factor), and contributing to improved energy focusing efficiency and magnetic field stability.

[0030] In a preferred embodiment, when the first capacitor structures C1 to C4 are located adjacent to the output terminal OT1, current flows from the input terminal IT1 to the output terminal OT1. This makes it easy for cumulative parasitic voltage drop and localized electric field concentration effects to occur in the conductor path, increasing dielectric loss and potential radiation loss in the region. However, in this disclosure, by providing capacitors in the region, localized impedance can be effectively adjusted, excessive voltage differences can be released, electric field peaks can be suppressed, and a transmission path with a stable electric field distribution and good impedance matching can be formed, thereby reducing overall power loss and improving wireless power transmission efficiency.

[0031] Furthermore, the resonant circuit network consisting of inductance and first capacitor structures C1-C4 may not only provide highly efficient energy coupling but also function as a frequency-selective passive filter. The passive filter simultaneously suppresses high-frequency noise and subharmonic components in the non-resonant frequency band by transmitting energy at the target resonant frequency, effectively filtering out stray electromagnetic waves caused by switching operation, harmonic reflection, or external RFI (radio frequency interference), thereby reducing energy loss and electric field distortion in the system due to interference. Due to the above filtering effect, electric field control during the operation of the wireless charging device can be made more focused and stable, the resonant coupling efficiency between the main magnetic field and the receiving end coil can be improved, and the interference resistance of the system in high-frequency operating environments can be practically enhanced. Moreover, since the overall resistance loss and eddy current loss of the coil structure 100 are simultaneously reduced, the overall power consumption decreases accordingly, further improving the energy retention rate and transmission efficiency of the device. In summary, the coil and capacitive resonant structure of the present invention simultaneously possess multiple functions such as strengthening energy coupling, suppressing electric field distribution, and preventing interference through filtering, making them suitable for highly efficient and stable wireless power transmission applications.

[0032] It should be noted that in some embodiments, the first capacitor structures C1 to C4 all have the same capacitance value, which simplifies the process and reduces the manufacturing cost of the coil structure 100.

[0033] In several other embodiments, the first capacitor structures C1 to C4 have different capacitance values. Specifically, the capacitance values ​​of the first capacitor structures C1 to C4 decrease sequentially from those located in the innermost layer of coils 120_1 to 120_4 to those located in the outermost layer. In other words, the capacitance values ​​of the first capacitor structures C1 to C4, in descending order, are first capacitor structure C1, first capacitor structure C2, first capacitor structure C3, and first capacitor structure C4.

[0034] Compared to capacitor structures with the same capacitance value, if the first capacitor structures C1 to C4 have different capacitance values ​​that gradually decrease from the inner layer to the outer layer, the electric field distribution on coils 120_1 to 120_4 can be effectively adjusted, that is, a better filtering effect can be achieved, and energy loss due to localized excessive electric field strength in the coil structure 100 can be avoided. Furthermore, by arranging capacitors with different capacitance values, the local electromagnetic resonance frequencies on coils 120_1 to 120_4 can be fine-tuned, making the overall magnetic field of the coil structure 100 more stable, which helps the wireless charging device concentrate energy on magnetic field transmission, thereby improving the quality coefficient and charging efficiency of the coil structure 100.

[0035] Please refer to Figures 2A to 2D. Figure 2A is a schematic diagram of a conductor 120 according to one embodiment of the present disclosure. Figures 2B to 2D are schematic diagrams of a first capacitor structure C1 according to a different embodiment of the present disclosure.

[0036] The conductor 120 in Figure 2A can correspond to the conductor 120 in Figure 1A. The conductor 120 in Figure 2A is similarly provided on the circuit board 110.

[0037] Figure 2A shows three different directions: a first direction D1, a second direction D2, and a third direction D3. The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other and may be considered as the three axes of three-dimensional space. The multi-turn coil of conductor 120 is provided in a first plane, which is a two-dimensional plane composed of the first direction D1 and the third direction D3. The input terminal IT1 and the output terminal OT1 are both located at a distance L1 from the multi-turn coil in the second direction D2 and both extend along the first direction D1.

[0038] In each of the different embodiments of this disclosure, the first capacitor structures C1 to C4 have similar structures. Figures 2B to 2D disclose only the structure of the first capacitor structure C1 in a different embodiment, and the first capacitor structures C2 to C4 may be referenced in correspondence with the following aspects of the first capacitor structure C1.

[0039] In Figure 2B, the first capacitor structure C1 includes a plurality of first extension arms ARM1 and a plurality of second extension arms ARM2. Each first extension arm ARM1 extends from the first side SD1 of the first gap GAP1, and each second extension arm ARM2 extends from the second side SD2 of the first gap GAP1. The length of both the first extension arm ARM1 and the length of the second extension arm ARM2 are smaller than the distance from the first side SD1 to the second side SD2 of the first gap GAP1. The first extension arms ARM1 and the second extension arms ARM2 are arranged in an intersecting manner, and the distance between each first extension arm ARM1 and the adjacent second extension arms ARM2 is the first gap GAPA. The first extension arms ARM1 and the second extension arms ARM2 function as capacitor elements in the coil structure 100.

[0040] In some embodiments, the first spacing GAPA between the plurality of first extension arms ARM1 and the plurality of second extension arms ARM2 all have the same width.

[0041] In some other embodiments, the plurality of first gaps GAPA may have different widths depending on different usage requirements. In other words, the distances separated by the plurality of first extension arms ARM1 and the plurality of second extension arms ARM2 do not have to be the same. By setting first gaps GAPA of different widths, the first capacitor structure C1 can be given different capacitance values.

[0042] It should be noted that in the embodiment shown in Figure 2B, the circuit board 110 is provided on the first plane, which is composed of a first direction D1 and a third direction D3, and each of the first extension arm ARM1 and each of the second extension arm ARM2 are provided intersecting in the first plane.

[0043] The first capacitor structure C1 in Figure 2C has multiple first extension arms ARM1 and second extension arms ARM2, similar to the first capacitor structure C1 in Figure 2B, and each of the first extension arms ARM1 and each of the second extension arms ARM2 in Figure 2C are arranged in a similar intersecting manner.

[0044] The difference in Figure 2C is that the first extension arm ARM1 and the second extension arm ARM2 are arranged to intersect along a second direction D2 perpendicular to the first plane. Figure 2A shows a cross-sectional line SL3, which extends along a third direction D3, and Figure 2C is a cross-sectional view of the first capacitor structure C1 in Figure 2A along the cross-sectional line SL3.

[0045] In Figure 2D, the first capacitor structure C1 includes a plurality of first extension arms ARM1 and a plurality of second extension arms ARM2, and functions as a capacitor element.

[0046] The first extension arm ARM1 extends from the first side SD1 of the first gap GAP1, and the second extension arm ARM2 extends from the second side SD2 of the first gap GAP1.

[0047] Two adjacent first extension arms ARM1 and two adjacent second extension arms ARM2 are separated by a first gap GAPA. Each first extension arm ARM1 is aligned with its corresponding second extension arm ARM2 in direction D3 and separated by a second gap GAPB. Specifically, the length of the first gap GAP1 is obtained by adding the length of the corresponding second extension arm ARM2 to the length of each first extension arm ARM1, and then adding the length of the second gap GAPB.

[0048] The second gap GAPB separated between each first extension arm ARM1 and the corresponding second extension arm ARM2 must not be aligned with the second gap GAPB separated between another adjacent first extension arm ARM1 and another second extension arm ARM2 in the first direction D1. In other words, any two adjacent second gap GAPBs are not aligned in direction D1.

[0049] In some embodiments, the lengths of two adjacent first extension arms ARM1 must not be the same, nor the lengths of two adjacent second extension arms ARM2. This arrangement prevents adjacent second spacing GAPBs from intersecting and aligning with each other.

[0050] It should be noted that in the embodiment shown in Figure 2D, the circuit board 110 is provided on the first plane consisting of a first direction D1 and a third direction D3, and the second spacing GAPB, separated by each of the first extension arm ARM1 and each of the second extension arm ARM2, is provided intersecting on the first plane.

[0051] In some other embodiments, the multiple second spacings GAPB separated by the first extension arm ARM1 and the second extension arm ARM2 are arranged to intersect in a second direction D2 perpendicular to the first plane. In some of these embodiments, Figure 2D may be considered a cross-sectional view along the cross-sectional line SL3 of the first capacitor structure C1 in Figure 2A.

[0052] Looking at the embodiments in Figures 2B to 2D together, the structure of the extension arm in the above embodiments can effectively disperse the electric field in the coil structure, reduce the local voltage in the coil, further suppress the formation of hot spots, and avoid localized concentration of the electric field.

[0053] Please refer to Figures 1A and 3 simultaneously, where Figure 3 is a schematic diagram of a coil structure 300 according to one embodiment of the present disclosure. The coil structure 300 consists of a circuit board 310 and a conductor 320. Compared to the coil structure 100 in Figure 1A, the characteristics of the circuit board 310 of the coil structure 300 are the same as those of the circuit board 110 of the coil structure 100, but the conductor 320 of the coil structure 300 differs from the conductor 120 of the coil structure 100 in that many capacitor structures are provided in its coils 320_1 to 320_4.

[0054] The conductor 320 may include first capacitor structures C11-C14, second capacitor structures C21-C24, third capacitor structures C31-C34, and fourth capacitor structures C41-C44. The first capacitor structures C11-C14, second capacitor structures C21-C24, third capacitor structures C31-C34, and fourth capacitor structures C41-C44 may be provided at different positions in coils 320_1 to 320_4. The number of capacitor structures provided in the conductor 320 is not limited under different usage conditions.

[0055] In the embodiment shown in Figure 3, the shape of the conductor 320 may be rectangular. The conductor 320 may be divided into four sides according to its shape. The first capacitor structures C11 to C14 may be provided on the first side of the conductor 320 (i.e., the lower side of the conductor 320 in Figure 3) together with the output terminal OT1 and the input terminal IT1. The second capacitor structures C21 to C24 may be provided on the second side of the conductor 320 (i.e., the left side of the conductor 320 in Figure 3). The third capacitor structures C31 to C34 may be provided on the third side of the conductor 320 (i.e., the upper side of the conductor 320 in Figure 3). The fourth capacitor structures C41 to C44 may be provided on the fourth side of the conductor 320 (i.e., the right side of the conductor 320 in Figure 3).

[0056] In this embodiment, the first direction D1 and the third direction D3 are perpendicular to each other, and the circuit board 310 is provided on a first plane consisting of the first direction D1 and the third direction D3. The first capacitor structures C11 to C14 may be aligned along the first direction D1, the second capacitor structures C21 to C24 may be aligned along direction D3, the third capacitor structures C31 to C34 may be aligned along the first direction D1, and the fourth capacitor structures C41 to C44 may be aligned along the third direction D3. The first capacitor structures C11 to C14 and the fourth capacitor structures C41 to C44 do not need to be aligned.

[0057] The first capacitor structure C11, the second capacitor structure C21, the third capacitor structure C31, and the fourth capacitor structure C41 provided in coil 320_1 may have the same capacitance value. The first capacitor structure C12, the second capacitor structure C22, the third capacitor structure C32, and the fourth capacitor structure C42 provided in coil 320_2 may have the same capacitance value. The first capacitor structure C13, the second capacitor structure C23, the third capacitor structure C33, and the fourth capacitor structure C43 provided in coil 320_3 may have the same capacitance value. The first capacitor structure C14, the second capacitor structure C24, the third capacitor structure C34, and the fourth capacitor structure C44 provided in coil 320_4 may have the same capacitance value.

[0058] In some embodiments, the first capacitor structures C11 to C14 all have the same capacitance value. That is, the first capacitor structures C11 to C14, the second capacitor structures C21 to C24, the third capacitor structures C31 to C34, and the fourth capacitor structures C41 to C44 all have the same capacitance value.

[0059] In several other embodiments, the first capacitor structures C11 to C14 have different capacitance values. The capacitance values ​​of the first capacitor structures C11 to C14 decrease sequentially from those located in the innermost layer to those located in the outermost layer of coils 320_1 to 320_4. The capacitance values ​​of each capacitor structure in the conductor 320, in descending order, are: first capacitor structure C11 (same as second capacitor structure C21, third capacitor structure C31, and fourth capacitor structure C41), first capacitor structure C12 (same as second capacitor structure C22, third capacitor structure C32, and fourth capacitor structure C42), first capacitor structure C13 (same as second capacitor structure C23, third capacitor structure C33, and fourth capacitor structure C43), and first capacitor structure C14 (same as second capacitor structure C24, third capacitor structure C34, and fourth capacitor structure C44).

[0060] Compared to the coil structure 100 in Figure 1A, each of the coils 320_1 to 320_4 in Figure 3 has four capacitor structures. Therefore, the electric field in coils 320_1 to 320_4 is not concentrated in a single capacitor structure, but is uniformly distributed across the first to fourth capacitor structures. In this way, the coil structure 300 further reduces the factor of localized electric field excess, making the energy loss due to the coil structure 300 lower than that due to the coil structure 100. In other words, the quality factor and charging efficiency of the coil structure 300 can be further improved.

[0061] Please refer to Figures 2A, 2B, 4A, and 4B simultaneously. Figure 4A is a schematic diagram of a first capacitor structure C1 and an add-on capacitor structure AC1 according to one embodiment of the present disclosure. Figure 4B is a schematic diagram of a first capacitor structure C1 and an add-on capacitor structure AC2 according to one embodiment of the present disclosure.

[0062] To increase the capacitance change of a coil-structured capacitor, an additional capacitor structure may be provided in the capacitor structure. Taking the first capacitor structure C1 in Figure 2B as an example, to increase the capacitance change of the first capacitor structure C1, an additional capacitor structure may be added to the first capacitor structure C1 to obtain the structure shown in the embodiment in Figure 4A or Figure 4B.

[0063] In Figure 4A, the add-on capacitor structure AC1 can function as a capacitor element in the coil 120_1 by providing a second gap GAP2. The add-on capacitor structure AC1 may be connected in parallel with the first capacitor structure C1, and the add-on capacitor structure AC1, the first capacitor structure C1, and the coil 120_1 are integrally molded.

[0064] A dielectric layer may be formed in the second gap GAP2, and the dielectric material for filling the dielectric layer may be any material having a dielectric constant, so as to set the capacitance density of the additive capacitor structure AC1 itself without increasing the physical size of the additive capacitor structure AC1 itself.

[0065] By adding the add-on capacitor structure AC1, the capacitive impedance in coil 120_1 becomes adjustable, and furthermore, the objective of adjusting the change in capacitance can be achieved.

[0066] In Figure 4B, the additive capacitor structure AC2 includes a plurality of first extension arms AC_ARM1 and a plurality of second extension arms AC_ARM2. Each first extension arm AC_ARM1 extends from the first side AC_SD1 of the second gap GAP2, and each second extension arm AC_ARM2 extends from the second side AC_SD2 of the second gap GAP2. The lengths of both the first extension arms AC_ARM1 and the second extension arms AC_ARM2 are shorter than the distance from the first side AC_SD1 to the second side AC_SD2 of the second gap GAP2.

[0067] The first capacitor structure C1 in Figure 4B can correspond to the first capacitor structure C1 of coil 120_1 in Figure 2A. The add-on capacitor structure AC2 in Figure 4B may be provided within the coil structure 100 in Figure 2A so as to be connected in parallel to the first capacitor structure C1 in Figure 2A. Furthermore, the circuit board 110 is provided on the first plane consisting of a first direction D1 and a third direction D3, and each of the first extension arm AC_ARM1 and each of the second extension arm AC_ARM2 are provided intersecting along the third direction D3 in the first plane.

[0068] In summary, when a wireless charging device having the coil structure of this disclosure performs charging, the coil structure of this disclosure can have a low electric field strength, which means that the electrical energy of the wireless charging device is not excessively consumed in the coil. Furthermore, the coil structure of this disclosure can generate a strong magnetic field strength, enabling the wireless charging device to have high charging efficiency. In addition, because power consumption in the coil structure of this disclosure is reduced, the temperature rise of the coil structure is also reduced.

[0069] The foregoing are merely preferred embodiments of the Disclosure, and various modifications and uniform changes may be made to the Disclosure without departing from the scope or spirit of the Disclosure. In summary, all modifications and uniform changes made to the Disclosure within the scope of the following claims are covered by the Disclosure. [Explanation of Symbols]

[0070] 100, 300: Coil structure 110, 310: Circuit board 120, 320: Conductor 120_1, 120_2, 120_3, 120_4, 320_1, 320_2, 320_3, 320_4: Coil C1, C2, C3, C4, C11, C12, C13, C14: First capacitor structure C21, C22, C23, C24: Second Capacitor Structure C31, C32, C33, C34: Third capacitor structure C41, C42, C43, C44: Fourth capacitor structure IT1: Cable entry terminal OT1:Output terminal CEN1: Center point D1: 1st direction D2:Second direction D3: Third direction SL3: Section line L1: Length ARM1, AC_ARM1: First extension arm ARM2, AC_ARM2: Second extension arm SD1, AC_SD1: First side SD2, AC_SD2: Second side GAP1: First gap GAP2: Second Gap GAPA: 1st interval GAPB: 2nd interval AC1, AC2: Additive-type capacitor structure

Claims

1. A coil structure applicable to the field of wireless charging, Circuit board and A conductor provided on the circuit board includes a coil of multiple turns formed by winding around a central point, an input terminal connected to one end of the coil of multiple turns, an output terminal connected to the other end of the coil of multiple turns, and a plurality of first capacitor structures provided on each of the coils of multiple turns, Equipped with, The distance between the plurality of first capacitor structures and the output terminal is smaller than the distance between the plurality of first capacitor structures and the input terminal, and the plurality of first capacitor structures are coil structures that do not overlap with the output terminal.

2. The coil structure according to claim 1, wherein a first gap is formed in each of the multiple turns of the coil, the multiple first capacitor structures are formed through the first gap, and the multiple first capacitor structures and the multiple turns of the coil are integrally molded.

3. The coil structure according to claim 1, wherein the plurality of first capacitor structures in the plurality of turns of the coil are aligned along a first direction.

4. The coil structure according to claim 1, wherein the plurality of first capacitor structures all have the same capacitance value.

5. The coil structure according to claim 1, wherein the plurality of first capacitor structures have different capacitance values.

6. Each of the plurality of first capacitor structures includes a plurality of first extension arms and a plurality of second extension arms, The plurality of first extension arms extend from the first side of the first gap, and the plurality of second extension arms extend from the second side of the first gap. Each of the plurality of first extension arms is separated by a first interval from a corresponding one of the plurality of second extension arms, and the lengths of the plurality of first extension arms and the lengths of the plurality of second extension arms are both smaller than the distance from the first side to the second side of the first gap. The coil structure according to claim 2, wherein each of the plurality of first extension arms and each of the plurality of second extension arms are provided in an intersecting manner.

7. The coil structure according to claim 6, wherein the circuit board is provided on a first plane, and each of the plurality of first extension arms and each of the plurality of second extension arms are provided intersecting in the first plane.

8. The coil structure according to claim 6, wherein the circuit board is provided on a first plane, and the plurality of first extension arms and the plurality of second extension arms are provided intersecting in a second direction perpendicular to the first plane.

9. The coil structure according to claim 6, wherein the widths of the plurality of first intervals are all different.

10. Each of the plurality of first capacitor structures includes a plurality of first extension arms and a plurality of second extension arms, The plurality of first extension arms extend from the first side of the first gap, and the plurality of second extension arms extend from the second side of the first gap. A first interval is provided between each of the plurality of first extension arms, and the first interval is provided between each of the plurality of second extension arms. The coil structure according to claim 2, wherein each of the plurality of first extension arms is separated by a second interval from a corresponding one of the plurality of second extension arms, and the two adjacent second intervals are not aligned in the first direction.

11. The coil structure according to claim 1, wherein the conductor further comprises a plurality of additional capacitor structures, each connected in parallel to each corresponding of the plurality of first capacitor structures.

12. The coil structure according to claim 11, wherein each of the plurality of additional capacitor structures forms a second gap, and the plurality of first capacitor structures, the plurality of additional capacitor structures, and the plurality of turn coils are integrally molded.

13. Each of the above-mentioned plurality of additional capacitor structures includes a plurality of first extension arms and a plurality of second extension arms, The plurality of first extension arms extend from the first side of the second gap, and the plurality of second extension arms extend from the second side of the second gap. The coil structure according to claim 12, wherein the plurality of first extension arms and the plurality of second extension arms are arranged in an intersecting manner.

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