Mixed coupling wireless power transfer system

Abstract

The present invention relates to a wireless power transfer system comprising: a transmission unit including a voltage source, a first coil electrically connected to the voltage source, and a first metal plate and a third metal plate that are electrically connected to the voltage source; and a reception unit including a voltage load, a second coil electrically connected to the voltage load, and a second metal plate and a fourth metal plate that are electrically connected to the voltage load, wherein: power is transmitted and received by a magnetic field formed between the first coil and the second coil; power is transmitted and received by an electric field formed between the first metal plate and the second metal plate; and power is transmitted and received by an electric field formed between the third metal plate and the fourth metal plate.

Description

Hybrid coupling wireless power transfer system

[0001] The present invention relates to a wireless power transmission system, and is a technology for a wireless power transmission system that combines an inductive wireless power transmission method and a capacitive wireless power transmission method.

[0002] Recently, wireless power transfer (WPT) technology has been developed and commercialized in various fields such as portable electronic devices, medical devices, electric vehicles, and robots due to increased convenience and stability through simplification of the charging structure.

[0003] In particular, research is being conducted on wireless power transmission technology that transmits high power outputs of several kW to tens of kW with high power transmission efficiency, such as electric vehicles such as automated guided vehicles (AGVs) used in the plant, automobile, and train industries.

[0004] As an example of wireless power transfer technology, inductive wireless power transfer (IPT) systems using magnetically coupled coils can transmit more power through larger air gaps while maintaining high efficiency. However, IPT systems using magnetically coupled coils can experience significant efficiency losses if there is a mismatch between the transmitting and receiving coils.

[0005] As another example, capacitive wireless power transfer (CPT) systems using electrically coupled metal plates can provide higher misalignment tolerance while generating negligible eddy currents.

[0006] However, capacitive wireless power transfer (CPT) systems using electrically coupled metal plates have the disadvantage of being limited to a very short power transmission distance, which can correspond to an air gap.

[0007] Meanwhile, in the inductive wireless power transfer system (IPT), transmission can be transmitted by a magnetic field generated between a transmitting coil and a receiving coil, but problems such as electromagnetic campatibility (EMC) and electromagnetic field (EMF) may occur depending on the formed magnetic field. In addition, the capacitive wireless power transfer system (CPT) can transmit power using an electric field, but problems such as EMC and EMF may occur depending on the formed electric field.

[0008] The purpose of the present invention is to provide a hybrid coupling wireless power transmission system that combines the characteristics of an IPT method using a magnetic field and a CPT method using an electric field in a wireless power transmission system that wirelessly transmits power.

[0009] A wireless power transmission system according to one embodiment of the present invention includes a transmitter including a voltage source, a first coil electrically connected to the voltage source, and a first metal plate and a third metal plate electrically connected to the voltage source; and a receiver including a voltage load, a second coil electrically connected to the voltage load, and a second metal plate and a fourth metal plate electrically connected to the voltage load; wherein power is transmitted and received by a magnetic field formed between the first coil and the second coil, power is transmitted and received by an electric field formed between the first metal plate and the second metal plate, and power is transmitted and received by an electric field formed between the third metal plate and the fourth metal plate.

[0010] The area occupied by the first metal plate and the third metal plate is characterized in that it corresponds to the area occupied by the first coil.

[0011] The area occupied by the second metal plate and the fourth metal plate is characterized in that it corresponds to the area occupied by the second coil.

[0012] It is characterized in that data is transmitted and received by an electric field generated between the first metal plate of the transmitting unit and the second metal plate of the receiving unit.

[0013] It is characterized in that power is transmitted by a magnetic field generated between the first coil and the second coil.

[0014] The above data may include control data for controlling power transmitted from the first coil to the second coil.

[0015] It is characterized in that power is transmitted and received by an electric field generated between the first metal plate of the transmitting unit and the second metal plate of the receiving unit.

[0016] It is characterized in that data is transmitted and received by a magnetic field generated between the first coil and the second coil.

[0017] The above data may include control data for controlling power transmitted from the first metal plate to the second metal plate.

[0018] The first metal plate and the third metal plate are characterized in that they are arranged adjacently on the same plane.

[0019] The first metal portion and the second metal portion are characterized in that they are composed of aluminum plates.

[0020] A medium is disposed between the first metal plate of the transmitting unit and the second metal plate of the receiving unit, and the medium is characterized in that it is a fluid.

[0021] The present invention further includes a medium portion arranged to surround the first metal plate of the transmitting unit, wherein the first metal plate and the second metal plate generate an electric field, and power is transmitted from the transmitting unit to the receiving unit through the medium portion.

[0022] The dielectric constant inside the above medium is characterized by being greater than the dielectric constant of air.

[0023] The method further includes a medium portion arranged to surround the second metal plate of the receiving unit, wherein the first metal plate and the second metal plate generate an electric field, and power is transmitted from the transmitting unit to the receiving unit through the medium portion.

[0024] The present invention provides a hybrid coupling wireless power transmission system that combines the characteristics of the IPT method using a magnetic field and the CPT method using an electric field in a wireless power transmission system that wirelessly transmits power. The hybrid coupling wireless power transmission system according to the present invention can resolve EMC and EMF problems by dispersing them into two types of fields.

[0025] FIG. 1 is a drawing illustrating an inductive wireless power transmission system according to one embodiment of the present invention.

[0026] FIG. 2 is a drawing illustrating a capacitive wireless power transmission system according to one embodiment of the present invention.

[0027] FIG. 3 is a drawing illustrating a four-plate capacitive wireless power transmission system according to one embodiment of the present invention.

[0028] FIG. 4 is a drawing illustrating a stacked 4-plate capacitive wireless power transmission system according to one embodiment of the present invention.

[0029] FIG. 5 is a drawing illustrating a capacitive wireless power transmission system in an air medium according to one embodiment of the present invention.

[0030] FIG. 6 is a drawing illustrating a capacitive wireless power transmission system of another medium according to one embodiment of the present invention.

[0031] FIG. 7 is a drawing illustrating a capacitive wireless power transmission system in an air medium according to one embodiment of the present invention.

[0032] FIG. 8 is a drawing illustrating a capacitive wireless power transmission system of another medium according to an embodiment of the present invention.

[0033] Figure 9 is a graph showing transmission and reception characteristics in a vacuum medium according to one embodiment of the present invention.

[0034] Figure 10 is a graph showing transmission and reception characteristics in a water medium according to one embodiment of the present invention.

[0035] FIG. 11 is a drawing illustrating a stacked 4-plate capacitive wireless power transmission system according to one embodiment of the present invention.

[0036] FIG. 12 is a drawing illustrating an inductive wireless power transmission system according to one embodiment of the present invention.

[0037] FIG. 13 is a drawing showing a transmitter configuration of an inductive wireless power transmission system according to an embodiment of the present invention.

[0038] FIG. 14 is a diagram showing a transmitter / receiver configuration of an inductive wireless power transmission system according to one embodiment of the present invention.

[0039] Fig. 15 is a graph showing the transmitter-receiver coupling characteristics of an inductive wireless power transmission system according to one embodiment of the present invention.

[0040] Fig. 16 is a graph showing the transmitter-receiver coupling characteristics of a capacitive wireless power transmission system according to one embodiment of the present invention.

[0041] FIG. 17 is a drawing illustrating a wireless power transmission system for a robot according to one embodiment of the present invention.

[0042] FIG. 18 is a drawing illustrating a wireless power transmission system that takes into account the movement line of a robot according to one embodiment of the present invention.

[0043] FIG. 19 is a drawing illustrating a wireless power transmission system that takes into account the movement line of a robot according to one embodiment of the present invention.

[0044] FIG. 20 is a drawing illustrating a wireless power transmission system that takes into account the movement line of a robot according to one embodiment of the present invention.

[0045] FIG. 21 is a drawing showing an inductive wireless power transmission system according to one embodiment of the present invention.

[0046] FIG. 22 is a drawing showing a capacitive wireless power transmission system according to one embodiment of the present invention.

[0047] FIG. 23 is a drawing showing a hybrid wireless power transmission system according to one embodiment of the present invention.

[0048] FIG. 24 is a drawing showing a hybrid wireless power transmission system according to one embodiment of the present invention.

[0049] FIG. 25 is a diagram showing a magnetic field of an inductive wireless power transmission system according to an embodiment of the present invention.

[0050] FIG. 26 is a diagram showing an electric field of an inductive wireless power transmission system according to one embodiment of the present invention.

[0051] FIG. 27 is a diagram showing a magnetic field of a capacitive wireless power transmission system according to one embodiment of the present invention.

[0052] FIG. 28 is a diagram showing an electric field of a capacitive wireless power transmission system according to one embodiment of the present invention.

[0053] FIG. 29 is a diagram showing a magnetic field of a hybrid wireless power transmission system according to an embodiment of the present invention.

[0054] FIG. 30 is a diagram showing an electric field of a hybrid wireless power transmission system according to an embodiment of the present invention.

[0055] A wireless power transmission system according to one embodiment of the present invention includes a transmitter including a voltage source, a first coil electrically connected to the voltage source, and a first metal plate and a third metal plate electrically connected to the voltage source; and a receiver including a voltage load, a second coil electrically connected to the voltage load, and a second metal plate and a fourth metal plate electrically connected to the voltage load; wherein power is transmitted and received by a magnetic field formed between the first coil and the second coil, power is transmitted and received by an electric field formed between the first metal plate and the second metal plate, and power is transmitted and received by an electric field formed between the third metal plate and the fourth metal plate.

[0056] The area occupied by the first metal plate and the third metal plate is characterized in that it corresponds to the area occupied by the first coil.

[0057] The area occupied by the second metal plate and the fourth metal plate is characterized in that it corresponds to the area occupied by the second coil.

[0058] It is characterized in that data is transmitted and received by an electric field generated between the first metal plate of the transmitting unit and the second metal plate of the receiving unit.

[0059] It is characterized in that power is transmitted by a magnetic field generated between the first coil and the second coil.

[0060] The above data may include control data for controlling power transmitted from the first coil to the second coil.

[0061] It is characterized in that power is transmitted and received by an electric field generated between the first metal plate of the transmitting unit and the second metal plate of the receiving unit.

[0062] It is characterized in that data is transmitted and received by a magnetic field generated between the first coil and the second coil.

[0063] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings and the contents described in the attached drawings, but the present invention is not limited or restricted by the embodiments.

[0064] 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 the context clearly dictates 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.

[0065] The terms “embodiment,” “example,” “aspect,” and “example” used herein are not to be construed as implying that any aspect or design described is better or advantageous over other aspects or designs.

[0066] Also, the term 'or' means 'inclusive or' rather than 'exclusive or'. That is, unless stated otherwise or clear from context, the expression 'x utilizes a or b' means any one of the natural inclusive permutations.

[0067] Additionally, as used in this specification and claims, the singular forms “a” or “an” should generally be construed to mean “one or more” unless otherwise indicated or clear from the context to be in the singular form.

[0068] Additionally, while the terms "first," "second," etc., used in this specification and claims may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another.

[0069] 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.

[0070] Meanwhile, when describing the present invention, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted. Furthermore, the terminology used in this specification is intended to appropriately express embodiments of the present invention and may vary depending on the intent of the user or operator, or the practices of the field to which the present invention pertains. Therefore, the definitions of these terms should be based on the contents throughout this specification.

[0071] FIG. 1 is a drawing illustrating an inductive wireless power transmission system according to one embodiment of the present invention.

[0072] Referring to FIG. 1, an inductive wireless power transmission system according to an embodiment of the present invention may include a transmitter including a voltage source (111) and a first coil (112) (transmitting coil) electrically connected to the voltage source (111), and a receiver including a voltage load (121) and a second coil (122) (receiving coil) electrically connected to the voltage load (121).

[0073] The first coil (112) and the second coil (122) can generate a magnetic field. The power output from the voltage source (111) of the transmitter can be transmitted to the voltage load (121) of the receiver by the magnetic field formed in the first coil (112) and the second coil (122). The inductive wireless power transfer (IPT) system illustrated in FIG. 1 can transmit more power through a larger air gap while maintaining relatively high efficiency compared to the capacitive wireless power transfer (CPT) system. However, the inductive wireless power transfer (IPT) system using magnetically coupled coils may experience a decrease in efficiency when a mismatch occurs between the transmitting coil and the receiving coil.

[0074] FIG. 2 is a drawing illustrating a capacitive wireless power transmission system according to one embodiment of the present invention.

[0075] Referring to FIG. 2, a capacitive wireless power transmission system according to an embodiment of the present invention may include a transmitter including a voltage source (111) and a first metal plate (113a) and a third metal plate (113b) electrically connected to the voltage source (111), and a receiver including a voltage load (121) and a second metal plate (123a) and a fourth metal plate (123b) electrically connected to the voltage load (121).

[0076] The first metal plate (113a) and the second metal plate (123a) can generate an electric field. The second metal plate (113b) and the fourth metal plate (123b) can generate an electric field.

[0077] The power output from the voltage source (111) of the transmitting unit can be transmitted to the voltage load (121) of the receiving unit by the electric field formed in the first metal plate (113a) and the second metal plate (123a). The power output from the voltage source (111) of the transmitting unit can be transmitted to the voltage load (121) of the receiving unit by the electric field formed in the third metal plate (113b) and the fourth metal plate (123b).

[0078] As illustrated in FIG. 2, a capacitive wireless power transfer (CPT) system using electrically coupled metal plates can provide higher misalignment tolerance while generating negligible eddy currents. However, a capacitive wireless power transfer (CPT) system using electrically coupled metal plates has a disadvantage in that its power transmission distance is limited to a shorter distance than that of the inductive wireless power transfer (IPT) system illustrated in FIG. 1.

[0079] FIG. 3 is a drawing illustrating a four-plate capacitive wireless power transmission system according to one embodiment of the present invention.

[0080] Referring to FIG. 3, as described above in FIG. 2, the transmitter of the wireless power transmission system may be configured to include a transmitter circuit (110) (primary side circuit) including a voltage source (111) and a plurality of metal plates (e.g., a first metal plate (113a) and a third metal plate (113b)). The receiver of the wireless power transmission system may be configured to include a receiver circuit (120) (secondary side circuit) including a voltage load (121) and a plurality of metal plates (e.g., a second metal plate (123a) and a fourth metal plate (123b)).

[0081] According to one embodiment, the first metal plate (113a) and the third metal plate (113b) connected to the transmitting circuit (110) may be arranged parallel to each other. Additionally, the second metal plate (123a) and the fourth metal plate (123b) connected to the receiving circuit (120) may be arranged parallel to each other.

[0082] As illustrated in FIG. 3, a four-plate capacitive wireless power transmission system can have a relatively high coupling coefficient when the metal plates of the transmitter and receiver are properly aligned. Accordingly, the wireless power transmission system can ensure relatively high efficiency. However, the four-plate capacitive wireless power transmission system illustrated in FIG. 3 has a structural limitation that its self-capacitance is relatively low, making it difficult to design an appropriate resonant frequency. In addition, the four-plate capacitive wireless power transmission system illustrated in FIG. 3 has a relatively large cross capacitance component, so if misalignment occurs where the receiver deviates from the correct position, its efficiency may decrease.

[0083] FIG. 4 is a drawing illustrating a stacked 4-plate capacitive wireless power transmission system according to one embodiment of the present invention.

[0084] Referring to FIG. 4, a transmitter of a stacked-four plate capacitive wireless power transfer system according to one embodiment may be configured to include a transmitter circuit (110) (primary side circuit) including a voltage source (111) and a plurality of metal plates (e.g., a first metal plate (114a) and a third metal plate (114b)). A receiver of the wireless power transfer system may be configured to include a receiver circuit (120) (secondary side circuit) including a voltage load (121) and a plurality of metal plates (e.g., a second metal plate (124a) and a fourth metal plate (124b)).

[0085] According to one embodiment, the first metal plate (114a) of the transmitter may be connected to a first output line of the transmitter circuit (110), and the third metal plate (114b) may be connected to a second output line of the transmitter circuit (110). The second metal plate (124a) of the receiver may be connected to a first input line of the receiver circuit (120), and the fourth metal plate (124b) may be connected to a second input line of the receiver circuit (120). As illustrated in FIG. 4, in a stacked-four plate capacitive wireless power transmission system, the first metal plate (114a), the third metal plate (114b), the second metal plate (124a), and the fourth metal plate (124b) may form a stacked structure between a voltage source (111) of the transmitter and a voltage load (121) of the receiver.

[0086] The stacked four-plate capacitive wireless power transmission system illustrated in FIG. 4 can have a relatively large increase in the magnetic capacitance between the transmitter and the receiver compared to the four-plate capacitive wireless power transmission system illustrated in FIG. 3 described above. Accordingly, the stacked four-plate capacitive wireless power transmission system illustrated in FIG. 4 can prevent a decrease in efficiency due to misalignment compared to the four-plate capacitive wireless power transmission system illustrated in FIG. 3 described above. In addition, the stacked four-plate capacitive wireless power transmission system illustrated in FIG. 4 occupies a smaller space than the four-plate capacitive wireless power transmission system illustrated in FIG. 3 described above, and can be designed in cell units, so that it can be suitable for implementing a multi-transmitter capacitive wireless power transmission system. On the other hand, the stacked 4-plate capacitive wireless power transmission system illustrated in FIG. 4 may have a relatively lower coupling coefficient compared to the 4-plate capacitive wireless power transmission system illustrated in FIG. 3 described above due to electrical coupling in a limited space.

[0087] In the embodiments described below, the low coupling coefficient of the four-plate capacitive wireless power transmission system can be effectively improved by changing the medium that processes power transmission in the space between the transmitter and the receiver. Hereinafter, various embodiments that can increase the coupling coefficient by changing the medium between the transmitter and the receiver will be described with reference to FIGS. 5 to 11.

[0088] FIG. 5 is a drawing illustrating a capacitive wireless power transmission system in an air medium according to one embodiment of the present invention. Referring to FIG. 5, the space between the first metal plate (511) of the transmitter and the second metal plate (521) of the receiver may be filled with air as a first medium (530).

[0089] FIG. 6 is a drawing illustrating a capacitive wireless power transmission system of another medium according to an embodiment of the present invention. Referring to FIG. 6, a space between a first metal plate (511) of a transmitter and a second metal plate (521) of a receiver may be filled with a medium other than air as a second medium (630). For example, the second medium (630) may be a material having a relatively higher permittivity than air. The permittivity is a physical unit that represents the effect of a medium between charges on an electric field when an electric field acts between charges, and may also be viewed as the amount of charge that a medium can store. The permittivity of a material may be expressed as a relative value to the permittivity in a vacuum, and this value may be referred to as a dielectric constant. The relative permittivity or dielectric constant of each material may be confirmed as shown in below.

[0090] Medium dielectric constant (dielectric constant)Water81.1Acetone20Silicon11.8GaAs10.9Marble8.5Soda-lime-glass6.9Procelain6.0Epoxy4.0Fused silica4.0Nylon 6,64.0PVC3.5Ice3.0Amber2.8Polyethylene2.3Paraffin2.0Air1.0

[0091] It can be confirmed that most of the media exemplified in the above have relatively higher permittivity than that of air. For example, according to one embodiment, as illustrated in FIG. 6, a material having a relatively higher permittivity than air may be filled as a second medium (630) in the space between the first metal plate (511) of the transmitter and the second metal plate (521) of the receiver. The second medium (630) may be in the form of any one of a gas, a liquid, and a solid. For example, water having a relative permittivity of 81.1 may be filled as the second medium (630) in the space between the first metal plate (511) of the transmitter and the second metal plate (521) of the receiver. In this way, by filling a material having a relatively higher permittivity than air in the space between the first metal plate (511) of the transmitter and the second metal plate (521) of the receiver in the wireless power transmission system, the low coupling coefficient can be effectively improved. The second medium (630) may fill all or part of the space between the first metal plate (511) of the transmitter and the second metal plate (521) of the receiver. FIG. 7 is a drawing illustrating a capacitive wireless power transmission system in an air medium according to an embodiment of the present invention. Referring to FIG. 7, the transmitter and the receiver may form a stacked 4-plate capacitive wireless power transmission system as illustrated in FIG. 4. For example, the transmitter may have a first metal plate (711a) and a third metal plate (711b) overlapping each other, and the receiver may have a second metal plate (721a) and a fourth metal plate (721b) overlapping each other. For example, in a stacked 4-plate capacitive wireless power transmission system, the first metal plate (711a), the third metal plate (711b), the second metal plate (721a), and the fourth metal plate (721b) can form a stacked structure between the voltage source (111) of the transmitter and the voltage load (121) of the receiver, as illustrated in FIG. 7.

[0092] Referring to FIG. 7, the space between the first metal plate (711a) or the third metal plate (711b) of the transmitter and the second metal plate (721a) or the fourth metal plate (721b) of the receiver can be filled with air as a first medium (830).

[0093] FIG. 8 is a drawing illustrating a capacitive wireless power transmission system of another medium according to an embodiment of the present invention. Referring to FIG. 8, the space between the first metal plate (711a) or the third metal plate (711b) of the transmitter and the second metal plate (721a) or the fourth metal plate (721b) of the receiver may be filled with a medium other than air as a second medium (830). For example, the second medium (830) may be a material having a relatively higher permittivity than air.

[0094] For example, according to one embodiment, as illustrated in FIG. 8, the space between the first metal plate (711a) or the third metal plate (711b) of the transmitter and the second metal plate (721a) or the fourth metal plate (721b) of the receiver may be filled with a material having a relatively higher permittivity than air as a second medium (830). The second medium (830) may be in any one of a gas, a liquid, and a solid form. For example, water having a relative permittivity of 81.1 may be filled as the second medium (830). In this way, by filling the space between the first metal plate (711a) or the third metal plate (711b) of the transmitter and the second metal plate (721a) or the fourth metal plate (721b) of the receiver with a material having a relatively higher permittivity than air in a wireless power transmission system, the low coupling coefficient can be effectively improved. The second medium (830) may be filled in all or part of the space between the first metal plate (711a) or the third metal plate (711b) of the transmitter and the second metal plate (721a) or the fourth metal plate (721b) of the receiver.

[0095] Fig. 9 is a graph showing transmission and reception characteristics in a vacuum medium according to an embodiment of the present invention. Fig. 10 is a graph showing transmission and reception characteristics in a water medium according to an embodiment of the present invention.

[0096] Referring to Figures 9 and 10, the S parameter (S) in a vacuum medium with a dielectric constant of 1 when the distance between the transmitter and the receiver is 5 mm 2l ) is 0.2, while the S parameter (S) in water with a relative permittivity of 81 2l ) is relatively high at 0.57. When the distance between the transmitter and receiver is 10 mm, the S parameter (S) in a vacuum medium with a dielectric constant of 1 2l ) is 0.1, while the S parameter (S) in water with a relative permittivity of 81 2l ) is relatively high at 0.38. When the distance between the transmitter and receiver is 15 mm, the S parameter (S) in a vacuum medium with a dielectric constant of 1 2l ) is 0.07, while the S parameter (S) in water with a relative permittivity of 81 2l ) is relatively high at 0.26. When the distance between the transmitter and receiver is 20 mm, the S parameter (S) in a vacuum medium with a dielectric constant of 1 2l ) is 0.05, while the S parameter (S) in water with a relative permittivity of 81 2l ) is relatively high at 0.18. When the distance between the transmitter and receiver is 25 mm, the S parameter (S) in a vacuum medium with a dielectric constant of 1 2l ) is 0.03, while the S parameter (S) in water with a relative permittivity of 81 2l ) is relatively high at 0.13. When the distance between the transmitter and receiver is 30 mm, the S parameter (S) in a vacuum medium with a dielectric constant of 1 2l ) is 0.03, while the S parameter (S) in water with a relative permittivity of 81 2l) is relatively high at 0.09. That is, it can be confirmed that the S parameter is higher in the water medium than in the vacuum medium at all distances. Therefore, in the aforementioned stacked 4-plate capacitive wireless power transmission system, the power transmission characteristics can be improved by filling the medium between the transmitter and the receiver with a material having a relatively high permittivity.

[0097] FIG. 11 is a drawing illustrating a stacked 4-plate capacitive wireless power transmission system according to one embodiment of the present invention.

[0098] Referring to FIG. 11, a transmitter of a stacked-four plate capacitive wireless power transfer system according to one embodiment may be configured to include a transmitter circuit (110) (primary side circuit) including a voltage source (111) and a plurality of metal plates (e.g., a first metal plate (114a) and a third metal plate (114b)). A receiver of the wireless power transfer system may be configured to include a receiver circuit (120) (secondary side circuit) including a voltage load (121) and a plurality of metal plates (e.g., a second metal plate (124a) and a fourth metal plate (124b)).

[0099] According to one embodiment, the first metal plate (114a) of the transmitter may be connected to a first output line of the transmitter circuit (110), and the third metal plate (114b) may be connected to a second output line of the transmitter circuit (110). The second metal plate (124a) of the receiver may be connected to a first input line of the receiver circuit (120), and the fourth metal plate (124b) may be connected to a second input line of the receiver circuit (120). As illustrated in FIG. 11, in a stacked-four plate capacitive wireless power transmission system, the first metal plate (114a), the third metal plate (114b), the second metal plate (124a), and the fourth metal plate (124b) may form a stacked structure between a voltage source (111) of the transmitter and a voltage load (121) of the receiver.

[0100] As illustrated in FIG. 11, the efficiency of charging can be improved by coating the first medium portion (1110) having a higher permittivity than air on the outside of the first metal plate (114a) and / or the third metal plate (114b) of the transmitter. In addition, the efficiency of charging can be improved by coating the second medium portion (1120) having a higher permittivity than air on the outside of the second metal plate (124a) and / or the fourth metal plate (124b) of the receiver. According to another embodiment, the first medium portion (1110) and the second medium portion (1120) may be implemented to include either one of them simultaneously or only one of them.

[0101] FIG. 12 is a drawing illustrating an inductive wireless power transmission system according to one embodiment of the present invention.

[0102] Referring to FIG. 12, an inductive wireless power transmission system according to an embodiment of the present invention may include a transmitter and a receiver. The transmitter may include a voltage source (111), a first coil (112) (transmitting coil) electrically connected to the voltage source (111), and a first capacitor (C1) (115) connected between the voltage source (111) and the first coil (112). The receiver may include a voltage load (121), a second coil (122) (receiving coil) electrically connected to the voltage load (121), and a second capacitor (C2) (125) connected between the voltage load (121) and the second coil (122).

[0103] As described above, the first coil (112) and the second coil (122) can generate a magnetic field. Power output from the voltage source (111) of the transmitter can be transmitted to the voltage load (121) of the receiver by the magnetic field formed in the first coil (112) and the second coil (122). The first coil (112) can be referred to as a primary coil, and the second coil (122) can be referred to as a secondary coil, but are not limited to the above terms.

[0104] As illustrated in FIG. 12, the inductive wireless power transmission system may further include a shield (1210, 1220) (or shield plate) to shield a high-intensity magnetic field. The shield (1210, 1220) may suppress the influence of electromagnetic interference (EMI) or electromagnetic compatibility (EMC) due to the high-intensity magnetic field generated from the coil, and may serve to concentrate the radiated magnetic field in the direction to be transmitted. For example, the first shield (1210) may be arranged so that the high-intensity magnetic field generated from the first coil (112) of the transmitter does not affect other circuits within the transmitter. In addition, the second shield (1220) may be arranged so that the high-intensity magnetic field generated from the second coil (122) of the receiver does not affect other circuits within the receiver. The first shielding portion (1210) and / or the second shielding portion (1220) may be formed of an aluminum plate, but is not limited thereto.

[0105] Meanwhile, in the above inductive wireless power transmission system, transmission can be transmitted by the magnetic field generated from the first coil (112) and the second coil (122), but in order to control the power transmission from the transmitter to the receiver, various data must be transmitted and received. Accordingly, the transmitter and receiver must each be equipped with separate communication means (e.g., Bluetooth, BLE, Wi-Fi, etc.).

[0106] According to one embodiment, the first shielding portion (1210) and the second shielding portion (1220) may be formed of a metal material (e.g., aluminum) to form an electric field with each other, thereby forming a capacitive wireless power transmission system. According to one embodiment, the first shielding portion (1210) may transmit power to the second shielding portion (1220) and may also transmit data. When data is transmitted and received between the first shielding portion (1210) and the second shielding portion (1220), a control signal for wireless power transmitted from the first coil (112) to the second coil (122) may also be transmitted and received.

[0107] The magnetic field formed between the first coil (112) and the second coil (122) and the electric field formed between the first shield (1210) and the second shield (1220) are different from each other, and thus may not affect each other. For example, in the system illustrated in FIG. 12, data transmission and reception and power transmission and reception may not interfere with each other. Therefore, in the power transmission system according to FIG. 12, power may be transmitted by the IPT method and data may be simultaneously transmitted by the CPT method without a separate space for additional communication. For example, while data may be transmitted and received between the first shield (1210) and the second shield (1220) by the CPT method, wireless power may be transmitted and received between the first coil (112) and the second coil (122) by the IPT method at the same time.

[0108] FIG. 13 and FIG. 14 are drawings showing an inductive wireless power transmission system according to one embodiment of the present invention.

[0109] Referring to FIGS. 13 and 14, a first shielding portion (1311, 1312) provided for shielding a first coil (112) in a transmitter of an inductive wireless power transmission system can transmit data by forming an electric field with a second shielding portion (1321, 1322) of a receiver. Data transmitted and received between the first shielding portion (1311, 1312) and the second shielding portion (1321, 1322) may be data for controlling power transmitted and received between the first coil (112) and the second coil (122), but is not limited thereto.

[0110] According to one embodiment, the first shielding portion (1311, 1312) is divided into a first-first shielding portion (1311) and a first-second shielding portion (1312), and the second shielding portion (1321, 1322) is divided into a second-first shielding portion (1321) and a second-second shielding portion (1322), thereby forming a four-plate type CPT system as exemplified in FIGS. 2 and 3 described above. Accordingly, the system illustrated in FIGS. 13 and 14 can simultaneously implement an IPT system and a CPT system without an additional communication module. In addition, since the data transmission system and the power transmission system operate independently, there is an advantage in that management and maintenance are convenient as a single system.

[0111] Fig. 15 is a graph showing the transmitter-receiver coupling characteristics of an inductive wireless power transmission system according to an embodiment of the present invention. Fig. 16 is a graph showing the transmitter-receiver coupling characteristics of a capacitive wireless power transmission system according to an embodiment of the present invention.

[0112] Referring to FIGS. 15 and 16, the S-parameter transmission characteristics of the IPT system and the CPT system included in the system illustrated in FIG. 12 can be confirmed. FIG. 15 shows the S-parameter transmission characteristics of the IPT system included in the system illustrated in FIG. 12, and FIG. 16 shows the S-parameter transmission characteristics of the CPT system included in the system illustrated in FIG. 12. To express the S-parameters, the coil and shielding plate of the transmitter use ports 1 and 2, respectively, and the coil and shielding plate of the receiver are defined as ports 3 and 4, respectively.

[0113] As shown in Fig. 15, S represents the coupling between the transmitting side IPT and the receiving side IPT. 31 It can be confirmed that it is relatively high at about 0.9. On the other hand, S, which represents the coupling between the transmitting side IPT and the receiving side CPT, 41 It can be confirmed that it is relatively very low at 0.05.

[0114] In addition, as shown in Fig. 16, S represents the coupling between the transmitting side CPT and the receiving side CPT. 42 It can be confirmed that it is relatively high at about 0.99. On the other hand, S, which represents the coupling between the transmitting side CPT and the receiving side IPT, 12 It can be confirmed that it is relatively very low at 0.05.

[0115] That is, as can be seen from the graphs of FIGS. 15 and 16, even though the IPT system and the CPT system between the transmitter and the receiver are configured to be largely adjacent to each other, they can operate independently of each other without affecting each other. Accordingly, the system can be designed so that the resonant frequency corresponding to the IPT system and the resonant frequency corresponding to the CPT system have different frequencies. For example, the first frequency can be designed as the resonant frequency for the IPT system, and the second frequency can be designed as the resonant frequency for the CPT system. According to the experimental examples of FIGS. 15 and 16, the resonant frequency of the IPT system can be set to 6.05 MHz, and the resonant frequency of the CPT system can be set to 3.89 MHz or 5.14 MHz. Accordingly, the shielding plates used in the IPT system (e.g., the first shielding portion (1210) and the second shielding portion (1220)) can operate as a transmitter and receiver of the CPT system. Accordingly, the IPT system and the CPT system can be implemented simultaneously without additional configuration. According to one embodiment, the two transmission methods can independently perform the roles of power transmission and data transmission, respectively, without requiring additional configuration and modules. For example, the power can be transmitted by the IPT system and the data can be transmitted by the CPT system, or the data can be transmitted by the IPT system and the power can be transmitted by the CPT system.

[0116] FIG. 17 is a drawing illustrating a wireless power transmission system for a robot according to one embodiment of the present invention.

[0117] Referring to Fig. 17, the human resources required for the delivery and movement of logistics in a logistics warehouse can be replaced by robots (1721). For example, for companies operating large logistics centers, replacing human resources with robots may be essential. Most robots (1721) used in each logistics warehouse are charged at a charging station (1710) within the logistics center. For example, after performing various necessary tasks, the robots (1721) move to a charging spot (1711) located in the charging station (1710) and then receive power from a coil or metal plate installed in the charging spot (1711). For example, each robot (1721) can receive power from the aforementioned IPT system or CPT system while located at a plurality of charging spots (1711) located in the charging station (1710).

[0118] Meanwhile, if the size of the logistics warehouse is large, the number of robots (1721) that can be charged simultaneously is limited, and since each robot (1721) consumes different amounts of power depending on its movement path, efficient operation may be difficult. More specifically, robots (1721) used in logistics warehouses, etc. are charged at a charging station (1710) inside the logistics center, as illustrated in FIG. 17, and regular visits to the charging station (1710) are required for the continuous operation of the robots (1721). However, the charging station (1710) is limited to a limited location inside the logistics warehouse, and each robot can only be charged at a designated charging location regardless of its main movement path.

[0119] FIG. 18 is a drawing illustrating a wireless power transmission system that takes into account the movement line of a robot according to one embodiment of the present invention.

[0120] Referring to FIG. 18, according to one embodiment, a dynamic power transfer system may be provided to efficiently design the movement path and improve the charging time of robots (1721, 1722, 1723) used in a logistics warehouse, etc. For example, as illustrated in FIG. 18, each robot (1721, 1722, 1723) may be supplied with power wirelessly along its movement path while moving, unlike FIG. 17. For example, a charging area (e.g., a transmitter) may be implemented at an optimal location by considering the movement path of each robot (1721, 1722, 1723) moving in the logistics warehouse. For example, in FIG. 18, a plurality of robots (1721, 1722, 1723) may move through each passageway. For example, the first robot (1721), the second robot (1722), and the third robot (1723) can each move through one of the first passage (1811), the second passage (1812), and the third passage (1813).

[0121] As illustrated in FIG. 18, according to one embodiment, charging areas (1811, 1812, 1813) may be placed at intersections considering the movement paths of each robot (1721, 1722, 1723). For example, a first charging area (1811) may be placed at an intersection corresponding to a first passage (1811), a second charging area (1812) may be placed at an intersection corresponding to a second passage (1812), and a third charging area (1813) may be placed at an intersection corresponding to a third passage (1813).

[0122] In one embodiment, each robot (1721, 1722, 1723) can be wirelessly supplied with power via a transmitter installed at each charging area (1811, 1812, 1813) located at each intersection as it passes through the intersection corresponding to each passage. By doing so, each robot (1721, 1722, 1723) can be dynamically supplied with power while moving without having to intentionally visit a charging station (1710) located at a specific location as illustrated in FIG. 17. Accordingly, each robot (1721, 1722, 1723) can reduce the time consumed for charging. Meanwhile, the arrangement locations of each charging area (1811, 1812, 1813) can be designed to be optimized in consideration of the movement paths of the robots (1721, 1722, 1723) and the structure of the logistics warehouse. In addition, each of the charging areas (1811, 1812, 1813) can be selectively turned on or off according to the movement lines and paths of the robots (1721, 1722, 1723). For example, when specific robots (1721, 1722, 1723) are located only in the first charging area (1811), the transmitters of the second charging area (1812) and the third charging area (1813) can be controlled to be in an off state or not to output power. The shape of each of the charging areas (1811, 1812, 1813) can be configured as a square as illustrated in FIG. 17, but is not limited to the above shape. For example, the shape of each of the charging areas (1811, 1812, 1813) can be configured as a circle or a polygon, unlike that illustrated in FIG. 17.

[0123] According to one embodiment, the transmitters installed in each of the charging areas (1811, 1812, 1813) can supply power to each of the robots (1721, 1722, 1723) by the IPT system illustrated in FIG. 1 or the CPT system illustrated in FIG. 2. For example, the IPT system or the CPT system can transmit power to the moving robots (1721, 1722, 1723) depending on the characteristics of the application. The CPT system may be less expensive to design than the IPT system, and may be more suitable for the dynamic wireless power transfer method because the impact on the surrounding human body and electronic devices is relatively less than that of the magnetic field. However, the charging method of the transmitters installed in each of the charging areas (1811, 1812, 1813) is not limited to the charging method of the CPT system.

[0124] FIG. 19 is a drawing illustrating a wireless power transmission system that takes into account the movement line of a robot according to one embodiment of the present invention.

[0125] Referring to Figure 19, the dynamic CPT system can be effectively applied to the charging of robots within a logistics warehouse that efficiently move along a standardized path. As described above, the dynamic CPT system enables charging simply by allowing the robot to pass through the charging area. Therefore, compared to conventional charging systems that require a robot to travel to a charging station for charging, the system can reduce path loss and the time required for charging. Furthermore, the system can effectively address the complex paths of robots and charging issues caused by the layout of charging stations.

[0126] According to one embodiment, as illustrated in FIG. 19, the shape or size of the charging areas (1911, 1912) may be designed to be optimized according to the structure of the logistics warehouse and the frequency of robot passage through each passage. For example, if the number or frequency of robots passing through the first passage (1811) is greater than the number or frequency of robots passing through the second passage (1812), the size of the first charging area (1911) arranged in the first passage (1811) may be designed to be larger than the size of the second charging area (1912) arranged in the second passage (1812). As an example, in the case of the first passage (1811) through which a relatively larger number of robots are likely to pass, the vertical length of the first charging area (1911) may be designed to be relatively longer so as to have a larger area than the second charging area (1912). By doing so, the charging efficiency can be increased.

[0127] Additionally, according to one embodiment, the first charging area (1911) can reduce the intensity (e.g., voltage) of the electric field required for charging by configuring a plurality of transmitter plates (e.g., capacitors) in parallel. Conversely, the second charging area (1912) can be configured to be relatively small because a relatively small number of robots pass through it. By optimizing the charging area according to the movement path and frequency of the robots in this way, the various characteristics of each logistics warehouse can be effectively reflected. Accordingly, efficient operation and charging of the robots can be provided.

[0128] FIG. 20 is a drawing illustrating a wireless power transmission system that takes into account the movement line of a robot according to one embodiment of the present invention.

[0129] Referring to Fig. 20, a rectangular first charging area (2011) can be formed in the first passage (1811), and a cross-shaped second charging area (2012) can be formed in the second passage (1812). By setting the size and shape of the charging area in this way, efficient charging can be provided to multiple robots.

[0130] FIG. 21 is a drawing showing an inductive wireless power transmission system according to one embodiment of the present invention.

[0131] Referring to FIG. 21, as described above with reference to FIG. 1, the inductive wireless power transfer system (IPT) can transmit power using a magnetic field. For example, the first coil (112) of the transmitter forms a magnetic field with the second coil (122) of the receiver, and power can be transmitted from the transmitter to the receiver by the formed magnetic field. In addition, problems such as electromagnetic campability (EMC) and electromagnetic field (EMF) may occur depending on the formed magnetic field.

[0132] FIG. 22 is a drawing showing a capacitive wireless power transmission system according to one embodiment of the present invention.

[0133] Referring to FIG. 22, as described above in FIG. 2, the capacitive wireless power transfer system (CPT) can transmit power using an electric field. For example, the first metal plate (113a) of the transmitter can generate an electric field with the second metal plate (123a) of the receiver. In addition, the second metal plate (113b) of the transmitter can generate an electric field with the fourth metal plate (123b) of the receiver. The power output from the voltage source of the transmitter can be transmitted to the voltage load of the receiver by the electric field formed in the first metal plate (113a) and the second metal plate (123a). In addition, the power output from the voltage source of the transmitter can be transmitted to the voltage load of the receiver by the electric field formed in the third metal plate (113b) and the fourth metal plate (123b). Meanwhile, problems such as EMC (electromagnetic campatibility) and EMF (electromagnetic field) may occur depending on the electric field formed above.

[0134] In one embodiment, referring to FIGS. 21 and 22, the magnetic field formed according to FIG. 21 and the electric field formed according to FIG. 22 have different characteristics, and may cause different EMC and EMF problems when they are at the same distance from the system. In particular, high-intensity magnetic fields may cause induced currents in the surrounding human body and electrical devices, and magnetic fields with high frequencies exceeding 100 kHz may cause thermal effects.

[0135] FIG. 23 and FIG. 24 are drawings showing a hybrid wireless power transmission system according to one embodiment of the present invention.

[0136] Referring to FIGS. 23 and 24, a charging system of a mixed coupled wireless power transfer (MPT) method can be provided by combining the characteristics of the IPT method described in FIG. 21 and the CPT method described in FIG. 22. For example, as illustrated in FIG. 23, the transmitter may include a first coil (112), a first metal plate (113a), and a third metal plate (113b), and the receiver may include a second coil (122), a second metal plate (123a), and a fourth metal plate (123b).

[0137] According to one embodiment, the first coil (112) of the transmitter and the second coil (122) of the receiver can transmit and receive power by forming a magnetic field with each other. In addition, the first metal plate (113a) of the transmitter and the second metal plate (123a) of the receiver can transmit and receive power by forming an electric field. In addition, the second metal plate (113b) of the transmitter and the fourth metal plate (123b) of the receiver can transmit and receive power by forming an electric field. The MPT wireless power transmission system illustrated in FIG. 23 can wirelessly transmit power by simultaneously utilizing electric and magnetic fields, unlike the existing method that wirelessly transmits power by focusing on one type of field. Accordingly, the MPT system can improve EMC and EMF problems by distributing the biased EMC and EMF problems of the wireless power transmission method that uses only one type of field into two types of fields. For example, EMC and EMF problems can be distributed and minimized by simultaneously utilizing electric and magnetic fields.

[0138] Hereinafter, the levels of electric and magnetic fields will be compared under the same conditions with reference to FIGS. 25 to 30. For example, the transmitters and receivers used in FIGS. 21, 22, and 24 have the same size (e.g., 30×30㎟), and all three systems can assume the same level of excitation of 1 W. Therefore, since the signal level and the system size are the same, the levels of electric and magnetic fields generated in three types of wireless power transfer systems (e.g., IPT, CPT, and MPT) can be compared under the same conditions. The electric and magnetic fields were compared at maximums of 100 A / m and 1000 V / m, respectively.

[0139] Fig. 25 is a diagram showing a magnetic field of an inductive wireless power transmission system according to an embodiment of the present invention. Fig. 26 is a diagram showing an electric field of an inductive wireless power transmission system according to an embodiment of the present invention.

[0140] Referring to FIGS. 25 and 26, it can be confirmed that a high-intensity magnetic field can be detected around the IPT system illustrated in FIG. 21, and an electric field is also formed at a level that cannot be ignored.

[0141] Fig. 27 is a diagram showing a magnetic field of a capacitive wireless power transmission system according to an embodiment of the present invention. Fig. 28 is a diagram showing an electric field of a capacitive wireless power transmission system according to an embodiment of the present invention.

[0142] Referring to Fig. 27, it can be confirmed that in the CPT system illustrated in Fig. 22, almost no magnetic field is detected. On the other hand, referring to Fig. 28, it can be confirmed that in the CPT system illustrated in Fig. 22, a high-intensity electric field is formed that is incomparable to that of the IPT system illustrated in Fig. 26.

[0143] FIG. 29 is a diagram showing a magnetic field of a hybrid wireless power transmission system according to an embodiment of the present invention. FIG. 30 is a diagram showing an electric field of a hybrid wireless power transmission system according to an embodiment of the present invention.

[0144] Referring to FIGS. 29 and 30, it can be seen that the magnitudes of the electric and magnetic fields in the MPT system illustrated in FIG. 24 are relatively low. For example, even though the same level of signal as that of the IPT and CPT systems is excited between the transmitter and the receiver, it can be seen that the magnitudes of the electric and magnetic fields of the MPT system are significantly lower than those of the IPT and CPT systems illustrated in FIGS. 25 to 28. For example, unlike conventional wireless power transmission systems that are biased toward one field, the MPT system utilizes both electric and magnetic fields simultaneously, so problems caused by EMC and EMF generated from each field can be dispersed.

[0145] The devices described above may be implemented as hardware components, software components, and / or a combination of hardware components and software components. For example, the devices and components described in the embodiments may be implemented using one or more general-purpose computers or special-purpose computers, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA), a programmable logic unit (PLU), a microprocessor, or any other device capable of executing instructions and responding to them. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to the execution of the software. For ease of understanding, the processing device is sometimes described as being used alone; however, one of ordinary skill in the art will recognize that the processing device may include multiple processing elements and / or multiple types of processing elements. For example, a processing unit may include multiple processors, or a processor and a controller. Other processing configurations, such as parallel processors, are also possible.

[0146] Software may include a computer program, code, instructions, or a combination of one or more of these, which may configure a processing device to perform a desired operation or may, independently or collectively, command the processing device. The software and / or data may be permanently or temporarily embodied in any type of machine, component, physical device, virtual equipment, computer storage medium or device, or transmitted signal wave, for interpretation by the processing device or for providing instructions or data to the processing device. The software may also be distributed over networked computer systems and stored or executed in a distributed manner. The software and data may be stored on one or more computer-readable recording media.

[0147] The method according to the embodiment may be implemented in the form of program commands that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program commands, data files, data structures, etc., alone or in combination. The program commands recorded on the medium may be those specially designed and configured for the embodiment or may be those known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, and hardware devices specially configured to store and execute program commands, such as ROMs, RAMs, and flash memories. Examples of the program commands include not only machine language codes generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiment, and vice versa.

[0148] Although the embodiments described above have been described by way of limited examples and drawings, those skilled in the art will appreciate that various modifications and variations can be made based on the above teachings. For example, appropriate results can still be achieved even if the described techniques are performed in a different order than described, and / or components of the described systems, structures, devices, circuits, etc. are combined or combined in a different manner than described, or are replaced or substituted with other components or equivalents.

[0149] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims described below.

Claims

1. A transmitter including a voltage source, a first coil electrically connected to the voltage source, and a first metal plate and a third metal plate electrically connected to the voltage source; and A receiver including a voltage load, a second coil electrically connected to the voltage load, and a second metal plate and a fourth metal plate electrically connected to the voltage load; Power is transmitted and received by a magnetic field formed between the first coil and the second coil, power is transmitted and received by an electric field formed between the first metal plate and the second metal plate, and power is transmitted and received by an electric field formed between the third metal plate and the fourth metal plate. Wireless power transfer system.

2. In paragraph 1, The area occupied by the first metal plate and the third metal plate is characterized in that it corresponds to the area occupied by the first coil. Wireless power transfer system.

3. In paragraph 1, The area occupied by the second metal plate and the fourth metal plate is characterized in that it corresponds to the area occupied by the second coil. Wireless power transfer system.

4. In paragraph 1, Characterized in that data is transmitted and received by an electric field generated between the first metal plate of the transmitting unit and the second metal plate of the receiving unit. Wireless power transfer system.

5. In paragraph 4, characterized in that power is transmitted by a magnetic field generated between the first coil and the second coil. Wireless power transfer system.

6. In paragraph 5, the data is, Containing control data for controlling power transmitted from the first coil to the second coil, Wireless power transfer system.

7. In paragraph 1, Characterized in that power is transmitted and received by an electric field generated between the first metal plate of the transmitting unit and the second metal plate of the receiving unit. Wireless power transfer system.

8. In paragraph 7, Characterized in that data is transmitted and received by a magnetic field generated between the first coil and the second coil. Wireless power transfer system.

9. In paragraph 8, the data is, Containing control data for controlling power transmitted from the first metal plate to the second metal plate, Wireless power transfer system.

10. In paragraph 1, The first metal plate and the third metal plate are characterized in that they are arranged adjacently on the same plane. Wireless power transfer system.

11. In paragraph 1, The first metal part and the second metal part are characterized in that they are composed of aluminum plates. Wireless power transfer system.

12. In paragraph 1, A medium disposed between the first metal plate of the transmitting unit and the second metal plate of the receiving unit; The above medium is characterized in that it is a fluid. Wireless power transfer system.

13. In paragraph 1, Further comprising a medium portion arranged to surround the first metal plate of the above transmitter; The first metal plate and the second metal plate generate an electric field, and power is transmitted from the transmitting section to the receiving section through the medium section, characterized in that Wireless power transfer system.

14. In paragraph 13, The dielectric constant inside the above medium is characterized by being greater than the dielectric constant of air. Wireless power transfer system.

15. In paragraph 1, Further comprising a medium portion arranged to surround the second metal plate of the receiver; The first metal plate and the second metal plate generate an electric field, and power is transmitted from the transmitting section to the receiving section through the medium section, characterized in that Wireless power transfer system.

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