Coil structure

Abstract

A coil structure is applied to the field of wireless charging. The coil structure includes a circuit board and a conductor. The conductor is disposed on the circuit board. The conductor includes a plurality of turns of coils, an incoming wire end, an outgoing wire end, and a plurality of first capacitor structures. The turns of coils are formed around a center point. The incoming wire end is connected to one of the outermost turns of the turns of coils. The outgoing wire end is connected to one of the innermost turns of the turns of coils and passes through each of the remaining turns of the turns of coils. The plurality of first capacitor structures is disposed on each of the turns of coils. The distance between the first capacitor structure and the outgoing wire end is less than the distance between the first capacitor structure and the incoming wire end, and the first capacitor structure does not overlap the outgoing wire end. The coil structure of the present application has a lower electric field strength and can generate a stronger magnetic field strength, so that the wireless charging device has a higher charging efficiency, thereby reducing the temperature rise of the coil structure.

Description

Technical Field

[0001] This invention relates to a coil structure, and more particularly to a coil structure in which a capacitor structure is provided in the coil. Background Technology

[0002] In the field of wireless charging, electromagnetic resonance is a common technical principle. Wireless charging systems that utilize electromagnetic resonance typically consist of two parts: a transmitter and a receiver. Both the transmitter and receiver use coil structures to transmit electromagnetic energy, thereby achieving the purpose of charging.

[0003] How to reduce energy loss in the coil structure and increase the magnetic field strength of the coil structure, thereby enhancing the electromagnetic energy transmission between the transmitting and receiving ends, is an important issue that needs to be addressed by those skilled in the art. Summary of the Invention

[0004] This invention provides a coil structure. The coil structure is applied in the field of wireless charging and includes a circuit board and conductors. The conductors are disposed on the circuit board. The conductors include a multi-turn coil, an input terminal, an output terminal, and multiple first capacitor structures. The multi-turn coil is formed around a center point. The input terminal is connected to the outermost turn of the multi-turn coil. The output terminal is connected to the innermost turn of the multi-turn coil and extends beyond each of the remaining turns of the multi-turn coil. Multiple first capacitor structures are disposed on each of the multi-turn coils. The distance between the first capacitor structure and the output terminal is less than the distance between the first capacitor structure and the input terminal, and the first capacitor structures do not overlap with the output terminal.

[0005] In some embodiments, a first gap is formed on each of the multi-turn coils, and the plurality of first capacitor structures are formed through the first gaps, wherein the plurality of first capacitor structures and the multi-turn coils are integrally formed.

[0006] In some embodiments, the plurality of first capacitor structures on 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, 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 from a corresponding one of the plurality of second extension arms by a first distance, the lengths of the plurality of first extension arms and the plurality of second extension arms being less 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 being staggered.

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

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

[0012] In some embodiments, the widths of the plurality of first spacings are not the same.

[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, the plurality of first extension arms extending from a first side of the first gap, 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 spacing, each of the plurality of second extension arms being separated by the first spacing, and each of the plurality of first extension arms and a corresponding one of the plurality of second extension arms being separated by a second spacing, the adjacent two of the plurality of second spacings being not aligned in a first direction.

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

[0015] In some embodiments, the plurality of additional capacitor structures each have a second gap formed, and the plurality of first capacitor structures, the plurality of additional capacitor structures, and the multi-turn coil are integrally formed.

[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, the plurality of first extension arms extending from a first side of the second gap and the plurality of second extension arms extending from a second side of the second gap, the plurality of first extension arms and the plurality of second extension arms being arranged alternately.

[0017] In summary, during wireless charging, the electric field strength on the coil structure of this invention can be reduced, thereby suppressing stray electric fields caused by parasitic capacitance, reducing the temperature rise of the coil structure, and improving magnetic field stability, thus enhancing the energy transmission efficiency of the transmitting and receiving ends of the wireless charging device. Therefore, a wireless charging device incorporating the aforementioned coil structure can have high charging efficiency. Attached Figure Description

[0018] Figure 1A This is a schematic diagram of a coil structure according to an embodiment of the present invention.

[0019] Figure 1B This is a schematic diagram of a conductor according to an embodiment of the present invention.

[0020] Figure 2A This is a schematic diagram of a conductor according to an embodiment of the present invention.

[0021] Figure 2B This is a schematic diagram of a capacitor structure according to an embodiment of the present invention.

[0022] Figure 2C This is a schematic diagram of a capacitor structure according to an embodiment of the present invention.

[0023] Figure 2D This is a schematic diagram of a capacitor structure according to an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of a coil structure according to an embodiment of the present invention.

[0025] Figure 4A This is a schematic diagram of a capacitor structure and an additional capacitor structure according to an embodiment of the present invention.

[0026] Figure 4B This is a schematic diagram of a capacitor structure and an additional capacitor structure according to an embodiment of the present invention. Detailed Implementation

[0027] The embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar elements or method flows.

[0028] Please refer to Figure 1A , Figure 1B , Figure 1A This is a schematic diagram of a coil structure 100 according to an embodiment of the present invention. Figure 1B This is a schematic diagram of a conductor 120 according to an embodiment of the present invention.

[0029] The coil structure 100 can be incorporated into a wireless charging device. This wireless charging device can be used for wireless charging of any motor equipment requiring power transmission, such as tracked or trackless automated guided vehicles (AGVs), drones, and other autonomous vehicles. The wireless charging device and autonomous vehicles can be applied to special environments inaccessible to humans, such as the deep sea, deserts, or vacuum environments. This reduces the risk of human involvement, eliminating the need for personnel to manually operate wired connections to charge motor equipment, allowing machines to automatically move into charging range, achieving a fully automated environment, and enabling uninterrupted automated operation. Furthermore, the wireless charging device can utilize the coil structure 100 to transfer energy to the target object (e.g., the aforementioned AGV) via electromagnetic resonance. In some embodiments, the wireless charging device can achieve this magnetic resonance charging through a resonant frequency of 6.78 MHz.

[0030] Specifically, the principle of electromagnetic resonance wireless charging technology is to have resonant coils tuned to the same resonant frequency at both the power transmitting end (e.g., coil structure 100) and the receiving end (e.g., the charging coil built into the aforementioned unmanned transport vehicle). Energy is transferred through a magnetic resonance coupling mechanism without the need for physical contact, thereby improving the efficiency of wireless charging over medium and long distances.

[0031] The coil structure 100 of the present invention can be disposed at the transmitting end or receiving end of a wireless charging device. The coil structure 100 comprises a circuit board 110 and conductors 120. The circuit board 110 can be a fixed medium, such as a printed circuit board (PCB). The conductors 120 can be positioned relative to each other (e.g., ...). Figure 1A A multi-turn coil is formed around the center point CEN1, and the position of the multi-turn coil is fixed by the circuit board 110.

[0032] The conductor 120 can be any shape, such as circular, quadrilateral or octagonal, and can be adjusted and changed according to different usage scenarios. The number of coil turns is also unlimited (the number of coil turns can be 4 turns, 8 turns, 16 turns, 32 turns, etc.). Figure 1AThe reason why conductor 120 is quadrilateral and has coils 120_1 to 120_4 is only for convenience in illustrating the configuration of coil structure 100, and does not mean that conductor 120 must be quadrilateral, nor that the number of coils in conductor 120 is limited to 4 turns. Conductor 120 may include an input terminal IT1 and an output terminal OT1. Input terminal IT1 and output terminal OT1 are respectively connected to the two ends of conductor 120 to allow current to flow through the multi-turn coil of conductor 120. Input terminal IT1 may be connected to one end of the multi-turn coil (e.g., the outermost turn of the multi-turn coil). Output terminal OT1 may be connected to the other end of the multi-turn coil (e.g., the outermost turn of the multi-turn coil).

[0033] In some embodiments, the input terminal IT1 is connected to the coil 120_4 and extends along the first direction D1, such as... Figure 1A As shown. In these embodiments, the output terminal OT1 is connected to coil 120_1, extends from below coils 120_1 to 120_4 across the multi-turn coil along the first direction D1, or extends outward from the innermost coil to the outermost coil.

[0034] In other embodiments, the input terminal IT1 is connected to the coil 120_4 and extends along a second direction D2 perpendicular to the first direction D1, such as... Figure 1B As shown. In these embodiments, the output terminal OT1 is connected to coil 120_1 and also extends along the second direction D2. Assuming that coils 120_1 to 120_4 are arranged in a first plane in space, the second direction D2 can be considered to be perpendicular to the first plane.

[0035] In other embodiments, the input terminal IT1 may extend along a first direction D1, while the output terminal OT1 extends along a second direction D2 (not shown). At least one capacitor structure may be provided on each of the multi-turn coils of conductor 120. Figure 1A As shown in the embodiment, first capacitor structures C1 to C4 can be respectively provided on coils 120_1 to 120_4. Each of coils 120_1 to 120_4 can have at least one dielectric material, such as paper, nylon, polystyrene, Teflon, ceramic, silicon, silicone oil, etc. If the dielectric material is a non-solid or non-liquid substance such as air, a gap can be formed on the coil, and the gap can correspondingly form the first capacitor structures C1 to C4. The first capacitor structures C1 to C4 and coils 120_1 to 120_4 are integrally formed.

[0036] like Figure 1AAs shown, the first capacitor structures C1~C4 can be aligned along the first direction D1. Furthermore, the distance between the first capacitor structures C1~C4 and the output terminal OT1 is less than the distance between the first capacitor structures C1~C4 and the input terminal IT1, and the positions of the first capacitor structures C1~C4 on the coil do not overlap with the positions of each turn of the coil extending from the output terminal OT1.

[0037] When current flows through the coil structure 100, the first capacitor structures C1 to C4 are configured between coils 120_1 to 120_4, which effectively reduces the parasitic capacitance coupling effect between coil units, thereby suppressing stray electric fields caused by parasitic capacitance. This significantly reduces the electric field strength on the overall coil structure 100, achieving the effects of field concentration and uniform electric field distribution. The first capacitor structures C1 to C4 further form an inductor-capacitor resonance (LC resonance) circuit with the coil units, giving the coil structure 100 a high quality factor (Q factor), which helps improve energy focusing efficiency and magnetic field stability.

[0038] In a preferred embodiment, when the first capacitor structures C1 to C4 are positioned adjacent to the output terminal OT1, the current flowing from the input terminal IT1 to the output terminal OT1 easily generates a cumulative parasitic voltage drop and a local electric field concentration effect in the conductor path, leading to increased dielectric loss and potential radiation loss in the region. However, by placing the capacitors in the region according to the present invention, the local impedance can be effectively adjusted, excessive voltage drops can be released, and electric field spikes can be suppressed, further forming a transmission channel with a stable electric field distribution and good impedance matching, thereby reducing overall power loss and improving wireless power transmission efficiency.

[0039] Furthermore, the resonant network formed by the inductor and the first capacitor structure C1-C4, in addition to providing high-efficiency energy coupling, can also serve as a frequency-selective passive filter. This passive filter can transmit energy at the target resonant frequency while suppressing high-frequency noise and subharmonic components in non-resonant frequency bands, effectively filtering stray electromagnetic waves caused by switching operations, harmonic reflections, or external radio frequency interference (RFI), reducing energy loss and field distortion caused by interference in the system. Through the aforementioned filtering effect, the field control of the wireless charging device during operation becomes more focused and stable, improving the resonant coupling efficiency between the main magnetic field and the receiving coil, and enhancing the system's anti-interference capability in high-frequency operating environments in practical applications. Moreover, since the overall resistance loss and eddy current loss of the coil structure 100 are reduced simultaneously, the overall power consumption is reduced accordingly, further improving the energy retention rate and transmission efficiency of the device. In summary, the coil and capacitor resonant structure of the present invention possesses multiple functions, including enhanced energy coupling, electric field distribution suppression, and filtering anti-interference, making it suitable for high-efficiency and stable wireless power transmission applications.

[0040] It is worth mentioning that in some embodiments, the first capacitor structures C1 to C4 all have the same capacitance value, thereby simplifying the manufacturing process and reducing the cost of manufacturing the coil structure 100.

[0041] In 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 the innermost coil of coils 120_1 to 120_4 to the outermost coil. That is, 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.

[0042] Compared to capacitor structures with the same capacitance value, when the first capacitor structure C1~C4 has different capacitance values ​​that gradually decrease from the inner to the outer coil, the electric field distribution on coils 120_1~120_4 can be effectively adjusted, achieving a better filtering effect and preventing excessively strong local electric fields in coil structure 100 from causing energy loss. Furthermore, by configuring capacitors with different capacitance values, the local electromagnetic resonance frequency on coils 120_1~120_4 can be fine-tuned, making the overall magnetic field of coil structure 100 more stable. This helps the wireless charging device concentrate energy for magnetic field transmission, thereby improving the quality factor and charging efficiency of coil structure 100.

[0043] Please refer to Figures 2A-2D . Figure 2A This is a schematic diagram of a conductor 120 according to an embodiment of the present invention. Figures 2B-2D This is a schematic diagram of the first capacitor structure C1 according to different embodiments of the present invention.

[0044] Figure 2A Conductor 120 in the middle can correspond to Figure 1A Conductor 120 in the middle. Figure 2A The conductor 120 is also disposed on the circuit board 110.

[0045] Figure 2A The diagram indicates three different directions: a first direction D1, a second direction D2, and a third direction D3. These three directions are perpendicular to each other and can be considered as three axes in three-dimensional space. The multi-turn coil of conductor 120 is disposed on 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 along the second direction D2 at a distance L1 from the multi-turn coil, and both the input terminal IT1 and the output terminal OT1 extend along the first direction D1.

[0046] In each of the different embodiments of the present invention, the first capacitor structures C1 to C4 have similar structures. Figures 2B-2D Only the structure of the first capacitor structure C1 in different embodiments is disclosed. The first capacitor structures C2 to C4 can be referred to the following contents of the first capacitor structure C1.

[0047] exist Figure 2B In the first capacitor structure C1, there are multiple first extension arms ARM1 and multiple 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 lengths of both the first extension arms ARM1 and the second extension arms ARM2 are less 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 staggered, and the distance between each first extension arm ARM1 and two adjacent second extension arms ARM2 is a first gap GAPA. The first extension arms ARM1 and the second extension arms ARM2 function as capacitor elements in the coil structure 100.

[0048] 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.

[0049] In other embodiments, the plurality of first spacing GAPAs may have different widths depending on different usage requirements. In other words, the distances between the plurality of first extension arms ARM1 and the plurality of second extension arms ARM2 may be different. By setting first spacing GAPAs of different widths, the first capacitor structure C1 can have different capacitance values.

[0050] It is worth mentioning that, in Figure 2B In one embodiment, the circuit board 110 is disposed on the first plane consisting of a first direction D1 and a third direction D3, and each of the first extension arms ARM1 and each of the second extension arms ARM2 are alternately disposed on the first plane.

[0051] Figure 2C The first capacitor structure C1 in the middle and Figure 2B The first capacitor structure C1 also has multiple first extension arms ARM1 and second extension arms ARM2, and Figure 2C Each of the first extension arm ARM1 and each of the second extension arm ARM2 are also staggered.

[0052] The difference is that, Figure 2C The first extension arm ARM1 and the second extension arm ARM2 are staggered along a second direction D2 perpendicular to the first plane. Figure 2AThe section line SL3 is marked in the middle and extends along the third direction towards D3. Figure 2C for Figure 2A A cross-sectional view of the first capacitor structure C1 along section line SL3.

[0053] exist Figure 2D In the first capacitor structure C1, there are multiple first extension arms ARM1 and multiple second extension arms ARM2, which function as capacitor elements.

[0054] The first extension arm ARM1 extends from the first side SD1 of the first slot GAP1, and the second extension arm ARM2 extends from the second side SD2 of the first slot GAP1.

[0055] 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 the third direction D3 and separated by a second gap GAPB. Specifically, the length of each first extension arm ARM1 plus the length of its corresponding second extension arm ARM2, plus the length of the second gap GAPB, equals the length of the first gap GAP1.

[0056] The second spacing GAPB between each first extension arm ARM1 and the corresponding second extension arm ARM2 cannot be aligned with the second spacing GAPB between an adjacent first extension arm ARM1 and another second extension arm ARM2 in the first direction D1. That is, any two adjacent second spacing GAPBs are not aligned in the first direction D1.

[0057] In some embodiments, the lengths of two adjacent first extension arms ARM1 cannot be the same, and the lengths of two adjacent second extension arms ARM2 cannot be the same. This arrangement allows adjacent second spacing GAPB to be staggered and not aligned.

[0058] It is worth mentioning that, in Figure 2D In one embodiment, the circuit board 110 is disposed on the first plane consisting of the first direction D1 and the third direction D3, and the second spacing GAPB between each of the first extension arms ARM1 and each of the second extension arms ARM2 is staggered on the first plane.

[0059] In other embodiments, the plurality of second-spaced GAPBs between the first extension arm ARM1 and the second extension arm ARM2 are staggered in a second direction D2 perpendicular to the first plane. In these embodiments, Figure 2D Can be regarded as Figure 2A A cross-sectional view of the first capacitor structure C1 along section line SL3.

[0060] Overall Figures 2B to 2D In the embodiments described above, the structure of the extension arm in these embodiments can effectively disperse the electric field in the coil structure, reduce the local voltage in the coil, thereby suppressing the formation of hot spots and avoiding local concentration of electric field.

[0061] Please refer to the following at the same time Figure 1A , Figure 3 , Figure 3 This is a schematic diagram of a coil structure 300 according to an embodiment of the present invention. The coil structure 300 is composed of a circuit board 310 and conductors 320. Compared to Figure 1A The characteristics of the circuit board 310 of the coil structure 100 and the coil structure 300 are the same as those of the circuit board 110 of the coil structure 100. The difference between the conductor 320 of the coil structure 300 and the conductor 120 of the coil structure 100 is that the conductor 320 of the coil structure 300 has more capacitor structures on the coils 320_1 to 320_4.

[0062] 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, the second capacitor structures C21~C24, the third capacitor structures C31~C34, and the fourth capacitor structures C41~C44 may be respectively disposed at different positions on coils 320_1~320_4; the number of capacitor structures disposed on conductor 320 is not limited under different usage scenarios.

[0063] exist Figure 3 In this embodiment, the conductor 320 may be quadrilateral in shape. Based on the shape of the conductor 320, it can be divided into four sides. The first capacitor structures C11~C14, along with the output terminal OT1 and the input terminal IT1, can be disposed on the first side of the conductor 320 (i.e., Figure 3 The lower side of conductor 320); the second capacitor structures C21~C24 can be disposed on the second side of conductor 320 (i.e., Figure 3 (on the left side of conductor 320); the third capacitor structures C31~C34 can be disposed on the third side of conductor 320 (i.e., Figure 3 The upper side of conductor 320); the fourth capacitor structure C41~C44 can be disposed on the fourth side of conductor 320 (i.e., Figure 3 (The right side of conductor 320).

[0064] In this embodiment, the first direction D1 and the third direction D3 are perpendicular to each other, and the circuit board 310 is disposed on the first plane formed by the first direction D1 and the third direction D3. The first capacitor structures C11~C14 can be aligned along the first direction D1, the second capacitor structures C21~C24 can be aligned along the third direction D3, the third capacitor structures C31~C34 can be aligned along the first direction D1, and the fourth capacitor structures C41~C44 can be aligned along the third direction D3. The first capacitor structures C11~C14 and the fourth capacitor structures C41~C44 do not need to be aligned.

[0065] The first capacitor structure C11, the second capacitor structure C21, the third capacitor structure C31, and the fourth capacitor structure C41 disposed on 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 disposed on 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 disposed on 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 disposed on coil 320_4 may have the same capacitance value.

[0066] 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.

[0067] In 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 the innermost coils of coils 320_1 to 320_4 to the outermost coils. The capacitance values ​​of the various capacitor structures on conductor 320, from largest to smallest, are as follows: 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).

[0068] Compared to Figure 1A The coil structure 100, Figure 3Each of the coils 320_1 to 320_4 has four capacitor structures. This ensures that the electric field on the coils 320_1 to 320_4 is not concentrated on a single capacitor structure, but is evenly distributed across the first to fourth capacitor structures. In this way, the coil structure 300 can further reduce the factors causing excessively strong local electric fields, resulting in lower energy loss due to the coil structure 300 compared to the coil structure 100. In other words, the quality factor and charging efficiency of the coil structure 300 can be further improved.

[0069] Please refer to the following at the same time Figure 2A , Figure 2B , Figure 4A , Figure 4B . Figure 4A This is a schematic diagram of a first capacitor structure C1 and an additional capacitor structure AC1 according to an embodiment of the present invention. Figure 4B This is a schematic diagram of a first capacitor structure C1 and an additional capacitor structure AC2 according to an embodiment of the present invention.

[0070] To increase the capacitance variation of the coil structure, an additional capacitor structure can be added. Figure 2B Taking the first capacitor structure C1 as an example, if it is desired to increase the capacitance variation of the first capacitor structure C1, an additional capacitor structure can be added to the first capacitor structure C1 to make it exhibit... Figure 4A or Figure 4B The structure shown in the embodiment.

[0071] exist Figure 4A In this design, the additional capacitor structure AC1 can function as a capacitor element on the coil 120_1 through the second gap GAP2. The additional capacitor structure AC1 can be connected in parallel with the first capacitor structure C1, and the additional capacitor structure AC1, the first capacitor structure C1, and the coil 120_1 are integrally formed.

[0072] A dielectric layer can be formed within the second gap GAP2, and the dielectric material used to fill the dielectric layer can be any material with a dielectric constant, so as to set the capacitance density of the additional capacitor structure AC1 without increasing the physical size of the additional capacitor structure AC1 itself.

[0073] By adding an additional capacitor structure AC1, the capacitance impedance on coil 120_1 can be adjusted, thereby achieving the purpose of adjusting the capacitance change.

[0074] exist Figure 4BIn the structure, the additional capacitor AC2 includes multiple first extension arms AC_ARM1 and multiple 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 less than the distance between the first side AC_SD1 and the second side AC_SD2 of the second gap GAP2.

[0075] Figure 4B The first capacitor structure C1 can correspond to Figure 2A The first capacitor structure C1 of coil 120_1 in the middle. Figure 4B The additional capacitor structure AC2 can be set in Figure 2A In the coil structure 100, and with Figure 2A The first capacitor structure C1 is connected in parallel. Further, the circuit board 110 is disposed on the first plane composed of the first direction D1 and the third direction D3, and each of the first extension arms AC_ARM1 and each of the second extension arms AC_ARM2 are staggered along the third direction D3 on the first plane.

[0076] In summary, when the wireless charging device with the coil structure of the present invention is charging, the coil structure of the present invention can have a lower electric field strength, which means that the electrical energy of the wireless charging device will not be excessively lost in the coil. Furthermore, the coil structure of the present invention can generate a stronger magnetic field strength, enabling the wireless charging device to have higher charging efficiency. In addition, due to the reduced power consumption in the coil structure of the present invention, the temperature rise of the coil structure is reduced.

[0077] The above are merely preferred embodiments of the present invention. Various modifications and equivalent changes can be made to the present invention without departing from its scope or spirit. In summary, all modifications and equivalent changes made to the present invention within the scope of the appended claims are within the scope of the present invention.

[0078] [Symbol Explanation] 100, 300: Coil structure 110, 310: Circuit board 120, 320: Conductors 120_1, 120_2, 120_3, 120_4, 320_1, 320_2, 320_3, 320_4: Coils 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: Input Terminal OT1: Outgoing cable end CEN1: Center point D1: First 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: First Spacing GAPB: Second Spacing AC1, AC2: Additional capacitor structure.

Claims

1. A coil structure for use in wireless charging, characterized in that, The coil structure includes: Circuit boards; and A conductor, disposed on the circuit board, the conductor comprising: A multi-turn coil, formed by wrapping around a center point; The input terminal is connected to one end of the multi-turn coil; The output terminal connects to the other end of the multi-turn coil; as well as A plurality of first capacitor structures are disposed in each of the multi-turn coils, wherein the distance between the plurality of first capacitor structures and the output terminal is less than the distance between the plurality of first capacitor structures and the input terminal, and the plurality of first capacitor structures do not overlap with the output terminal.

2. The coil structure according to claim 1, characterized in that, A first gap is formed on each of the multi-turn coils, and the plurality of first capacitor structures are formed through the first gaps, wherein the plurality of first capacitor structures and the multi-turn coils are integrally formed.

3. The coil structure according to claim 1, characterized in that, The plurality of first capacitor structures on the multi-turn coil are aligned along a first direction.

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

5. The coil structure according to claim 1, characterized in that, The plurality of first capacitor structures have different capacitance values.

6. The coil structure according to claim 2, characterized in that, 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 a first side of the first gap, and the plurality of second extension arms extend from a second side of the first gap. Each of the plurality of first extension arms is separated from a corresponding one of the plurality of second extension arms by a first distance. The lengths of the plurality of first extension arms and the plurality of second extension arms are both less than the distance from the first side to the second side of the first gap. Each of the plurality of first extension arms and each of the plurality of second extension arms are arranged alternately.

7. The coil structure according to claim 6, characterized in that, The circuit board is disposed on a first plane, and each of the plurality of first extension arms and each of the plurality of second extension arms are staggered on the first plane.

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

9. The coil structure according to claim 6, characterized in that, The widths of the plurality of first spacings are all different.

10. The coil structure according to claim 2, characterized in that, 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 a first side of the first gap, and the plurality of second extension arms extend from a second side of the first gap. Each of the plurality of first extension arms is separated by a first spacing, and each of the plurality of second extension arms is separated by the first spacing. Each of the plurality of first extension arms and a corresponding one of the plurality of second extension arms are separated by a second spacing, and adjacent pairs of the plurality of second spacings are not aligned in a first direction.

11. The coil structure according to claim 1, characterized in that, The conductor further includes a plurality of additional capacitor structures, each of which is connected in parallel with a corresponding one of the plurality of first capacitor structures.

12. The coil structure according to claim 11, characterized in that, The plurality of additional capacitor structures each have a second gap formed, and the plurality of first capacitor structures, the plurality of additional capacitor structures, and the multi-turn coil are integrally formed.

13. The coil structure according to claim 12, characterized in that, Each of the 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 a first side of the second gap, and the plurality of second extension arms extend from a second side of the second gap. The plurality of first extension arms and the plurality of second extension arms are arranged alternately.

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