Parallel wireless charging coil

Abstract

A parallel wireless charging coil of the present invention comprises: a shaft formed in a cylindrical shape; transmission coil units each including a transmission shielding member surrounding the shaft and a transmission coil wound around the transmission shielding member; reception coil units each including a reception coil that receives an alternating magnetic field generated by the transmission coil and a reception shielding member surrounding the reception coil, wherein the transmission coil units are configured as two or more units spaced apart from each other in the longitudinal direction of the shaft, and the reception coil units may be configured to correspond one-to-one with the two or more transmission coil units. The parallel wireless charging coil according to the present invention can improve coupling efficiency between the transmission and reception coils, and increase charging current capacity.

Description

Parallel wireless charging coil

[0001] The present invention relates to a parallel wireless charging coil.

[0002] Recently, wireless charging systems utilizing magnetic induction have been widely adopted in electronic devices. For example, electric toothbrushes and cordless razors are charged using the principle of electromagnetic induction, and recently, wireless charging products capable of charging electronic devices such as smartphones and laptops have been released.

[0003] Conventional wireless charging systems applied to these electronic devices adopt a method of placing the electronic device on a flat surface, and for this purpose, the shape of the charging coil is also configured as a two-dimensional flat shape.

[0004] Figure 1 is a drawing showing a conventional wireless charging coil.

[0005] This is a Qi wireless charging method widely used in electronic devices such as smartphones, and is a wireless charging method that uses three commonly used horizontal coils. Referring to Fig. 1, a first transmitting coil (11), a second transmitting coil (12), and a third transmitting coil (13) are arranged at a predetermined interval on a transmitting shielding member (30). In addition, a first receiving coil (21), a second receiving coil (22), and a third receiving coil (23) are arranged at a predetermined interval in contact with a receiving shielding member (40).

[0006] The first transmitting coil section is composed of a first transmitting coil (11) and a first receiving coil (21), the second transmitting coil section is composed of a second transmitting coil (12) and a second receiving coil (22), and the third transmitting coil section is composed of a third transmitting coil (13) and a third receiving coil (23). The transmitting and receiving coils of each transmitting coil section are arranged at a predetermined interval to perform power transmission by magnetic field coupling.

[0007] FIG. 2 is a diagram showing a magnetic field simulation of a wireless charging coil according to FIG. 1, and FIG. 3 is a diagram showing a coupling coefficient of a wireless charging coil according to FIG. 1.

[0008] Referring to Fig. 2, in a structure having a shape in which the gap between the transmitting coils (11, 12, 13) and the receiving coils (21, 22, 23) is 1 mm, the current distribution of each transmitting coil and receiving coil can be confirmed through simulation, and it can be seen that a magnetic flux is formed as shown by the arrow.

[0009] From Table 1 of FIG. 3, the coupling coefficient of each transmitting coil formed as described above and the coupling coefficient between adjacent transmitting coils can be confirmed. Table 1 shows that the coupling coefficient of the transmitting coil is relatively low, making efficient wireless power transmission difficult. For example, the coupling coefficient of the first transmitting coil (11) and the first receiving coil (21) is 65.67%, the coupling coefficient of the second transmitting coil (12) and the second receiving coil (22) is 70.34%, and the coupling coefficient of the third transmitting coil (13) and the third receiving coil (23) is 65.76%, confirming that the coupling coefficients are low.

[0010] Therefore, improvement is needed because a lot of power loss occurs when transmitting large amounts of power wirelessly using a conventional wireless charging coil.

[0011] The technical problem to be solved by the present invention is to provide a wireless charging coil that increases the coupling between the transmitting coil and the receiving coil in the wireless charging coil to enable efficient power transmission with low loss, and has expandability that allows easy parallel addition of transmitting and receiving coils to expand power transmission capacity.

[0012] The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0013] The parallel wireless charging coil of the present invention for solving the above technical problem comprises a shaft formed in a cylindrical shape, a transmitting coil portion including a transmitting shielding member surrounding the shaft and a transmitting coil wound around the transmitting shielding member, and a receiving coil portion including a receiving coil for receiving an alternating magnetic field generated from the transmitting coil and a receiving shielding member surrounding the receiving coil, wherein two or more of the transmitting coil portions are configured to be spaced apart from each other in the longitudinal direction of the shaft, and one receiving coil portion may be configured to correspond to each of the two or more transmitting coil portions.

[0014] In some embodiments of the present invention, the shielding member may be a ferrite core.

[0015] In some embodiments of the present invention, the transmitting coil unit may further include a transmitting circuit unit that supplies an alternating current to the transmitting coil.

[0016] In some embodiments of the present invention, the receiving coil unit may further include a receiving circuit unit that converts the alternating current of the receiving coil into a direct current.

[0017] In some embodiments of the present invention, the shaft may be formed of a non-magnetic material or a weakly magnetic material to reduce mutual interference of the transmitting coil portion.

[0018] In some embodiments of the present invention, the shaft may include a through hole through which a power supply line connected to the transmitting coil section passes.

[0019] In some embodiments of the present invention, the transmitting coil unit may be formed by connecting common transmitting unit modules in parallel.

[0020] In some embodiments of the present invention, the transmitting circuit unit of the transmitting coil unit can supply power to the transmitting circuit unit of another adjacent transmitting coil unit.

[0021] In some embodiments of the present invention, the receiving coil unit may be formed by connecting common receiving unit modules in parallel.

[0022] In some embodiments of the present invention, the receiving circuit of the receiving coil unit can connect the output voltage of the receiving circuit of another adjacent receiving coil unit.

[0023] In some embodiments of the present invention, the receiving circuit unit of the receiving coil unit may be characterized by having a built-in power separation circuit.

[0024] In some embodiments of the present invention, a seal for waterproofing may be included at the joint between the shaft and the transmitter housing.

[0025] In some embodiments of the present invention, a seal for waterproofing may be included at the joint between the receiver housing and the receiver body.

[0026] As described above, the parallel wireless charging coil according to the present invention increases the coupling between the transmitter and receiver of the wireless charging coil, thereby enabling power transmission with minimal loss. Furthermore, by additionally forming the transmitter and receiver in parallel, power can be transmitted in large capacities. Furthermore, the modularization of the transmitter allows for easy capacity expansion. Furthermore, the inclusion of a waterproof structure allows for widespread use without being restricted by the environment.

[0027] Figure 1 is a drawing showing a conventional wireless charging coil.

[0028] FIG. 2 is a diagram showing a magnetic field simulation of a wireless charging coil according to FIG. 1.

[0029] FIG. 3 is a diagram showing the coupling coefficient of the wireless charging coil according to FIG. 1.

[0030] FIG. 4 is a drawing showing a two-column parallel wireless charging coil according to one embodiment of the present invention.

[0031] FIG. 5 is a drawing showing a three-row parallel wireless charging coil according to one embodiment of the present invention.

[0032] FIG. 6 is a diagram showing a magnetic field simulation of a parallel wireless charging coil according to FIG. 5.

[0033] Fig. 7 is a diagram showing the coupling coefficient of the wireless charging coil according to Fig. 5.

[0034] FIG. 8 is a drawing showing a transmitter of a parallel wireless charging coil according to another embodiment of the present invention.

[0035] Fig. 9 is a diagram showing the circuit connection of the transmitter of the parallel wireless charging coil according to Fig. 8.

[0036] FIG. 10 is a drawing showing a receiving unit of a parallel wireless charging coil according to another embodiment of the present invention.

[0037] Fig. 11 is a diagram showing the circuit connection of the receiver of the parallel wireless charging coil according to Fig. 10.

[0038] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0039] “And / or” includes each and every combination of one or more of the items mentioned.

[0040] The terminology used herein is for the purpose of describing embodiments only and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements mentioned.

[0041] Additionally, throughout the specification, when a part is said to be "connected" to another part, this includes not only cases where it is "directly connected," but also cases where it is "indirectly" or "electrically connected" with other members or components in between.

[0042] Additionally, throughout the specification, the description that each layer (film), region, pattern or structure is formed "on" or "under" the substrate, each layer (film), region, pad or pattern includes both being formed directly or through the interposition of another layer. The criteria for being on / over or under / under each layer are explained based on the drawings.

[0043] Additionally, expressions such as 'first, second', etc. are used only to distinguish between multiple components, and do not limit the order or other characteristics between the components.

[0044] In addition, the flowcharts illustrated in the drawings are merely exemplary sequences for obtaining the most desirable results in carrying out the present invention, and it is obvious that other steps may be added or some steps may be deleted.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in their common sense to those of ordinary skill in the art to which the present invention pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0046] Hereinafter, a parallel wireless charging coil according to an embodiment of the present invention will be described with reference to the drawings.

[0047] FIG. 4 is a drawing showing a two-column parallel wireless charging coil according to one embodiment of the present invention.

[0048] Referring to Fig. 4, a shaft (50) is formed in a cylindrical shape at the center of the inside of a parallel wireless charging coil (1), and a first transmission shielding member (31) surrounding the shaft (50) may be formed. A first transmission coil (11) may be wound around the outside of the first transmission shielding member (31).

[0049] The first transmitting coil (11) is connected to a power supply unit through a first perforated hole (60, 61) formed in the shaft (50) and can receive high-frequency alternating current to form an alternating magnetic field.

[0050] The first receiving coil (21) can be wound inside the first receiving shielding member (41) while maintaining a predetermined distance from the first transmitting coil (11).

[0051] The above first receiving coil (21) can receive a magnetic field generated from the first transmitting coil (11).

[0052] A second transmission shielding member (32) may be formed spaced apart in the longitudinal direction of the shaft (50). A second transmission coil (12) may be wound on the outer surface of the second transmission shielding member (32).

[0053] The second transmitting coil (12) is connected to a power supply unit through a second perforation hole (62, 63) formed in the shaft (50) and can receive high-frequency alternating current to form an alternating magnetic field.

[0054] The second receiving coil (22) can be wound inside the second receiving shielding member (42) while maintaining a predetermined distance from the second transmitting coil (12).

[0055] The second receiving coil (22) can receive a magnetic field generated from the second transmitting coil (12).

[0056] In this way, the first transmitting coil unit may include a first transmitting coil (11), a first transmitting shielding member (31), a first receiving coil (21), and a first receiving shielding member (41), and the second transmitting coil unit may include a second transmitting coil (12), a second transmitting shielding member (32), a second receiving coil (22), and a second receiving shielding member (42).

[0057] The first transmitting coil unit and the second transmitting coil unit may be arranged at a predetermined interval so as to minimize mutual influence of the magnetic fields generated from each other.

[0058] At this time, the shaft (50) may be formed of a non-magnetic or weakly magnetic material to reduce mutual interference of the transmission coil section. Alternatively, other materials may be used by adjusting the separation distance.

[0059] The above-mentioned transmission shielding member (31, 32) or reception shielding member (41, 42) is installed to prevent the magnetic field generated from the transmission coil from leaking and causing unnecessary influence to the outside, and is preferably a ferrite core having excellent electromagnetic wave blocking properties, but is not limited thereto.

[0060] In this way, a parallel wireless charging coil (1) according to one embodiment of the present invention includes a shaft (50) formed in a cylindrical shape, a transmitting coil portion including a transmitting shielding member (31, 32) that surrounds the shaft (50) and a transmitting coil (11, 12) wound around the transmitting shielding member (31, 32), and a receiving coil portion including a receiving coil (21, 22) that receives an alternating magnetic field generated by the transmitting coil (11, 12) and a receiving shielding member (41, 42) that surrounds the receiving coil (21, 22), and two or more transmitting coil portions are configured to be spaced apart from each other in the longitudinal direction of the shaft, and one receiving coil portion may be configured to correspond to each of the two or more transmitting coil portions, and the shaft (50) may include a through hole through which a power supply line connected to the transmitting coil (11, 12) of the transmitting coil portion passes.

[0061] FIG. 5 is a drawing showing a three-row parallel wireless charging coil according to one embodiment of the present invention.

[0062] Referring to FIG. 5, a three-row parallel wireless charging coil according to one embodiment of the present invention can be formed by adding one row to the two-row parallel wireless charging coil of FIG. 4.

[0063] Similar to the structure of Fig. 4, a third transmitting coil section including a third transmitting shielding member (33), a third transmitting coil (13), a third receiving shielding member (43), and a third receiving coil (23) formed spaced apart in the longitudinal direction of the shaft (50) can be formed.

[0064] The third transmitting coil (13) can also be connected to a power supply unit through another perforated hole formed on the outside of the shaft (50) to receive high-frequency alternating current and form an alternating magnetic field, and the third receiving coil (23) can receive the magnetic field generated by the third transmitting coil (13).

[0065] FIG. 6 is a diagram showing a magnetic field simulation of a parallel wireless charging coil according to FIG. 5, and FIG. 7 is a diagram showing a coupling coefficient of a wireless charging coil according to FIG. 5.

[0066] Referring to Fig. 6, in a structure having a shape in which the gap between the transmitting coils (11, 12, 13) and the receiving coils (21, 22, 23) is 1 mm, the current distribution of each transmitting coil and receiving coil can be confirmed through magnetic field simulation. At this time, it can be expected that the loss will be small as the current distribution is appropriately distributed. In addition, it can be seen that the magnetic flux, such as the arrow, is appropriately formed.

[0067] Referring to Table 2 of Fig. 7, the coupling coefficient of each transmitting coil formed as described above and the coupling coefficient between adjacent transmitting coils can be confirmed. At this time, Table 2 shows that the coupling coefficient of the corresponding transmitting coil is high. For example, the coupling coefficient of the first transmitting coil (11) and the first receiving coil (22) is 85.95%, the coupling coefficient of the second transmitting coil (12) and the second receiving coil (22) is 87.25%, and the coupling coefficient of the third transmitting coil (13) and the third receiving coil (23) is 86.21%, so it can be confirmed that the coupling coefficient of the corresponding transmitting coil where power transmission mainly takes place is high.

[0068] Compared to Table 1 of FIG. 3, the coupling coefficient of the conventional wireless charging coil is significantly improved by about 17 to 20%, so it can be confirmed that efficient wireless power transmission is achieved in the wireless charging coil according to the present invention.

[0069] A parallel wireless charging coil according to another embodiment of the present invention is described with reference to the following drawings.

[0070] FIG. 8 is a drawing showing a transmitter of a parallel wireless charging coil according to another embodiment of the present invention, wherein (a) is a cross-sectional view of a transmitter module, (b) is a cross-sectional view showing three transmitter modules connected, (c) is a perspective view showing three transmitter modules connected, and (d) is a perspective view showing a transmitter fully assembled.

[0071] Fig. 9 is a diagram showing the circuit connection of the transmitter of the parallel wireless charging coil according to Fig. 8.

[0072] First, referring to (a) of FIG. 8, the transmitter module includes a shaft (50), a transmission shielding member (30), and a transmission coil (10) included in one embodiment of the present invention, and may additionally include a transmission circuit unit (80).

[0073] The shaft (50) of the above transmitter module has a cylindrical pipe shape, and since the inner diameter of one side is smaller than the outer diameter of the other side, it can be inserted and joined with a force fit with the shaft (50) of the adjacent transmitter module.

[0074] Referring to Fig. 9, three transmitting circuits (81, 82, 83) are connected, and each transmitting circuit (81, 82, 83) may include a transmitting circuit input terminal (80A), a transmitting circuit output terminal (80B), and an AC generator. The AC generator may be connected to a transmitting coil (11, 12, 13).

[0075] A DC power is supplied from a transmitter circuit input terminal (80A), and the DC power is supplied to an AC generator within the transmitter circuit (81, 82, 83) to be converted into AC and then supply high-frequency AC current to the transmitter coils (11, 12, 13). The transmitter circuit input terminal (80A) is simultaneously connected to a transmitter circuit output terminal (80B) to supply DC power to an adjacent transmitter module.

[0076] The input terminal (80A) of the transmitter circuit unit can be installed as a female connector, and the output terminal (80B) of the transmitter circuit unit can be installed as a male connector, so that they can be inserted and connected to each other when connecting to an adjacent transmitter module.

[0077] When three transmitter modules are combined, the DC power supplied from the transmitter power circuit (87) to the first transmitter circuit (81) can be supplied to all of the first transmitter circuit (81), the second transmitter circuit (82), and the third transmitter circuit (83).

[0078] That is, the above-mentioned transmitting circuit unit can supply power to an AC generator inside the transmitting circuit unit and simultaneously supply power to another adjacent transmitting circuit unit.

[0079] In this way, the transmitter module is connected by having the shaft and the transmitter circuit inserted into each other, and multiple units can be easily connected in parallel.

[0080] Figures 8 (b) and (c) show a cross-sectional view and a perspective view of a transmitter formed by connecting three transmitter modules in parallel.

[0081] A module in which three transmitter modules and a transmitter power circuit (87) are combined can be assembled with a transmitter housing (53) that surrounds the combined modules to complete the transmitter.

[0082] A sealing portion for waterproofing may be included at the joint between the shaft (50) and the transmitter housing (53). A first sealing portion (65) may be formed on the shaft (50), and a second sealing portion (66) may be formed on the transmitter housing (53). At this time, the first sealing portion (65) and the second sealing portion (66) may be installed simultaneously or only one of the two. In addition, a waterproof connector may be used as the connection portion connected to the transmitter power circuit (87), so that the completed transmitter may have a waterproof function.

[0083] In this way, the above-mentioned transmitter coil unit can be easily increased in transmission power capacity by additionally connecting transmitter modules that can be commonly applied in parallel according to the power requirement specifications of the product.

[0084] FIG. 10 is a drawing showing a receiving unit of a parallel wireless charging coil according to another embodiment of the present invention, wherein (a) is a perspective view of a receiving unit module, (b) is a perspective view showing three receiving unit modules connected, (c) is a perspective view showing the receiving unit module assembled into a receiving unit housing, and (d) is a perspective view showing the receiving unit fully assembled.

[0085] Fig. 11 is a diagram showing the circuit connection of the receiver of the parallel wireless charging coil according to Fig. 10.

[0086] First, referring to (a) of FIG. 10, the receiving module includes a receiving shielding member (40) and a receiving coil (20) included in one embodiment of the present invention, and may additionally include a receiving circuit unit (90).

[0087] Referring to Fig. 11, three receiving circuits (91, 92, 93) are connected, and each receiving circuit (91, 92, 93) may include a receiving circuit input terminal (90A), a receiving circuit output terminal (90B), and a rectifier. The rectifier may be connected to a receiving coil (21, 22, 23).

[0088] The high-frequency alternating current induced and output in the above-mentioned receiving coils (21, 22, 23) can be rectified into direct current in a rectifier and output to the receiving circuit output terminal (90B) through a power separation diode (90D).

[0089] Since each receiving circuit input terminal (90A) and receiving circuit output terminal (80B) are connected in parallel with a connector wire, the receiving circuit can connect the output voltage of the receiving circuit of another adjacent receiving coil unit.

[0090] When three receiver modules are combined, the outputs of the rectifiers of the first receiver circuit (91), the second receiver circuit (92), and the third receiver circuit (93) are combined through their respective power separation diodes (90D) and output to the receiver power circuit (97) to be used as a power source for an electronic device. At this time, the power separation diode (90D) can prevent current from leaking to an adjacent receiver circuit. If the transmitter is not sufficiently inserted into the receiver due to the user's carelessness, a low voltage may be output from the corresponding receiver circuit. The power separation diode (90D) can prevent leakage current from flowing from the other receiver circuit, which outputs a high voltage, to the receiver circuit, which outputs a low voltage.

[0091] The shape in which three receiving modules are connected in this way is shown in the perspective view of Fig. 10 (b).

[0092] Referring to (c) of Fig. 10, after the three receiver modules and the receiver power circuit (97) are combined, the combined modules can be assembled into the receiver housing (55). The combined modules can be assembled by inserting them while surrounding the protrusions in the convex shape formed inside the receiver housing (55).

[0093] A groove in the shape of a concave shape is formed on the outside of the receiver housing (55), and the transmitter can be inserted into the groove.

[0094] The above receiver housing (55) can be assembled with a receiver body (56) that acts as another case that surrounds the receiver. When the receiver housing (55) and the receiver body (56) are assembled, the receiver is completed.

[0095] A seal for waterproofing may be included at the joint between the receiver housing (55) and the receiver body (56). A third sealing portion (67) may be formed on the receiver housing (55), and a fourth sealing portion (68) may be formed on the receiver body (56). At this time, the third sealing portion (67) and the fourth sealing portion (68) may be installed simultaneously or only one of the two. The receiver completed in this manner may have a waterproof function.

[0096] In this way, the receiving coil section can be easily increased in receiving power capacity by additionally connecting receiving section modules that can be commonly applied in parallel according to the power requirements of the product.

[0097] The wireless charging coil according to the present invention can enhance power transmission efficiency through high coupling between each transmitting coil and receiving coil, and can enable high-capacity power transmission and reception by connecting modules in parallel as needed. Furthermore, common modules can be additionally connected in parallel to expand power transmission capacity, providing easy expandability. Furthermore, the inclusion of a waterproof structure sealed with a sealing member enables charging functionality that is unaffected by location or environment.

[0098] Although the present invention has been described as above, those skilled in the art will recognize that the present invention can be implemented in other forms while maintaining the technical spirit and essential features of the present invention.

[0099] The scope of the present invention will be fundamentally determined by the patent claims, but it should be interpreted that not only the configuration directly derived from the description of the patent claims, but also all changes or modified forms derived from equivalent configurations are included in the scope of the present invention.

Claims

1. A shaft having a cylindrical shape; A transmission coil unit including a transmission shielding member surrounding the shaft and a transmission coil wound around the transmission shielding member; and It includes a receiving coil section that receives an alternating magnetic field generated from the transmitting coil and a receiving shielding member that surrounds the receiving coil, A parallel wireless charging coil, wherein the transmitting coil section is configured with two or more and spaced apart in the longitudinal direction of the shaft, and the receiving coil section is configured to correspond to each of the two or more transmitting coil sections.

2. In paragraph 1, The above shielding member is a parallel wireless charging coil which is a ferrite core.

3. In paragraph 1, A parallel wireless charging coil, wherein the transmitting coil section further includes a transmitting circuit section that supplies alternating current to the transmitting coil.

4. In paragraph 1, A parallel wireless charging coil, wherein the receiving coil section further includes a receiving circuit section that converts the alternating current of the receiving coil into direct current.

5. In paragraph 1, The above shaft is a parallel wireless charging coil formed of a non-magnetic or weakly magnetic material to reduce mutual interference of the transmitting coil section.

6. In paragraph 1, A parallel wireless charging coil, wherein the shaft includes a through hole through which a power supply line connected to the transmitting coil section passes.

7. In paragraph 1, A parallel wireless charging coil, characterized in that the above-mentioned transmitter coil unit is formed by connecting common transmitter modules in parallel.

8. In paragraph 7, A parallel wireless charging coil, wherein the transmitting circuit of the above transmitting coil unit supplies power to the transmitting circuit of another adjacent transmitting coil unit.

9. In paragraph 1, A parallel wireless charging coil, characterized in that the above-mentioned receiving coil unit is formed by connecting common receiving unit modules in parallel.

10. In paragraph 9, A parallel wireless charging coil that connects the output voltage of the receiving circuit of the receiving coil unit of the above receiving coil unit to the receiving circuit unit of another adjacent receiving coil unit.

11. In paragraph 9, A parallel wireless charging coil, characterized in that the receiving circuit of the receiving coil section has a built-in power separation circuit.

12. In paragraph 1, A parallel wireless charging coil including a seal for waterproofing at the joint between the shaft and the transmitter housing.

13. In paragraph 1, A parallel wireless charging coil including a waterproof seal at the joint between the receiver housing and the receiver body.

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