Method and system for multi-segment switching and power distribution based on multi-layered overlapping feed coils through multi-inverter control

Abstract

A method and system for performing multi-segment switching and power distribution based on multi-layered overlapping feed coils through multi-inverter control are provided. A plurality of feed coils and a plurality of inverters are utilized to independently control the phase, or both the phase and magnitude, of the current in each coil, thereby enabling selective activation or deactivation of specific segments and efficient power distribution. In the switching process, since switching is achievable solely through inverter phase control, the complexity of conventional switch-based methods is eliminated and efficiency is enhanced. In the power distribution process, the phase, or both the phase and magnitude, of the inverter current are flexibly adjusted according to the position and charging requirements of a vehicle to provide appropriate power to each segment. The present invention is applicable to both dynamic and stationary charging, and contributes to the improved efficiency and flexibility of wireless charging for electric vehicles.

Description

Method and system for switching and power distribution of multi-segment based on multiple overlapping feed coils through multi-inverter control

[0001] The present invention relates to wireless charging technology for electric vehicles, and more particularly to a method and system for effectively performing switching and power distribution of multiple overlapping power supply coils using multiple inverters during charging while driving or stopped.

[0002] With the recent rapid increase in the adoption of electric vehicles, the need for wireless charging technology is growing. Despite technological advancements, maintaining the miniaturization of electric vehicle batteries remains economical, and dynamic charging is attracting attention as an attractive solution for minimizing battery size. Furthermore, there is a demand for technology that can efficiently meet the diverse charging needs of various vehicles in static charging as well.

[0003] In conventional technology, charging is performed by detecting the vehicle's location and then activating or deactivating the corresponding segment via a switch. Fig. 1 is a conceptual diagram illustrating this conventional single-coil segmentation method, in which a method is implemented where the corresponding track (segment) is turned ON / OFF via a switch depending on the vehicle's entry. However, this method has the following disadvantages:

[0004] - A time delay occurs between the processing of sensor signals for vehicle entry and position detection and the activation / deactivation of the actual segment.

[0005] - In particular, when the vehicle speed is high, such as during charging while driving, this time delay can significantly reduce the ability to deliver energy to the vehicle.

[0006] To address this, a method of controlling multiple coils using two inverters was studied. Figure 2 illustrates a conventional technology for controlling multiple coil segments using two inverters, showing how segments are activated sequentially during charging while driving, and how power is selected or distributed to multiple segments during charging while stationary. In this method, the mutual inductance of the coils is designed to be close to zero, enabling independent current control. It has the advantage of being able to activate or deactivate specific segments by adjusting the phase difference between the two inverters.

[0007] Figure 3 is a graph illustrating the process in which induced voltage and power change according to the phase difference of the inverter in this conventional technology. Although this method is designed to concentrate or distribute power to specific segments, the following limitations exist:

[0008] - In driving charging involving long segments, there are limitations in efficiently controlling segments to meet the vehicle's various charging requirements.

[0009] - There is a lack of flexibility in distributing power by precisely reflecting the charging demands of multiple vehicles during charging while stationary.

[0010] Therefore, technical improvements are required to overcome these limitations of existing technology and implement a more efficient and flexible wireless charging system.

[0011] The present invention aims to overcome the limitations of existing wireless charging technology and to solve the following problems in dynamic charging and static charging, respectively.

[0012] First, regarding charging while driving, the challenge is to provide technology that minimizes the activation / deactivation time of segments to maximize energy transfer efficiency despite the vehicle's high speed, and enables rapid control of the necessary segments according to the vehicle's charging requirements.

[0013] Second, regarding charging while stationary, the challenge is to provide a technical solution that precisely distributes power by efficiently reflecting the different charging requirements of each vehicle across multiple charging slots, and prevents unnecessary power supply to slots without charging vehicles.

[0014] Third, the challenge is to reduce the hardware complexity arising from existing switch-based segment control methods and to implement segment activation and power distribution more flexibly and economically through the control of only the current phase or both phase and magnitude using multiple inverters.

[0015] In conclusion, the present invention aims to solve the aforementioned technical problems through a multi-inverter and a multi-overlapping power supply coil structure, thereby significantly improving the wireless charging efficiency and flexibility of electric vehicles and providing a system capable of responding to various electric vehicle charging environments.

[0016] In order to solve the aforementioned technical problem, according to one aspect of the present invention, a multi-segment switching method is provided for selectively activating or deactivating a specific segment by controlling an inverter connected to each coil in a system comprising multiple inverters and multiple overlapping feed coils, comprising: a) supplying current through multiple inverters independently connected to each feed coil; and b) adjusting the current phase of each inverter to generate an induced voltage in a selected segment, wherein the adjustment of the current phase is performed to concentrate the induced voltage in the selected segment and prevent the induced voltage from occurring in the deactivated segment.

[0017] The above-mentioned multiple overlapping feed coils can be formed from coils of the same shape.

[0018] The above-mentioned multiple overlapping feed coils can be formed from heterogeneous coils having spatial orthogonality.

[0019] The above-mentioned multiple superimposed feed coils can be formed from heterogeneous coils having phase orthogonality.

[0020] The above switching can group segments according to the vehicle's movement speed and activate them on a group basis.

[0021] According to another aspect of the present invention, a segment switching system for switching multiple segments comprises: multiple segments composed of multiple feed coils; multiple inverters independently connected to each feed coil; and a control unit independently controlling the current phases of the multiple inverters, wherein the control unit comprises: a) means for adjusting the current phases of each inverter to concentrate an induced voltage on a selected segment; and b) means for controlling the current phases of each inverter so that no induced voltage is generated in an inactive segment, and a segment switching system is provided that activates or deactivates a specific segment solely by controlling the phases of the inverter currents without using additional switches during the switching process.

[0022] The above-mentioned multiple power supply coils can be formed from coils of the same shape.

[0023] The above-mentioned multi-feed coil can be formed from coils of heterogeneous shapes having spatial orthogonality.

[0024] The above-mentioned multi-feed coil can be formed from heterogeneous coils having phase orthogonality.

[0025] The above switching can group segments according to the vehicle's movement speed and activate them on a group basis.

[0026] According to another aspect of the present invention, a method for distributing power between multiple segments by controlling the phase of current flowing through each power supply coil in a system composed of multiple inverters and multiple overlapping power supply coils is provided, comprising: a) supplying current through multiple inverters independently connected to each power supply coil; b) selectively activating and deactivating each segment by adjusting the phase of each inverter current; and c) controlling the amount of power distributed to each segment according to the power requirements of a charging vehicle, wherein the adjustment of the current phase is performed to enable optimal power distribution according to the power requirements of the charging vehicle, such as concentrating power supply to a selected segment or distributing power evenly to all segments.

[0027] The above-mentioned multiple overlapping feed coils can be formed from coils of the same shape.

[0028] The above-mentioned multiple overlapping feed coils can be formed from heterogeneous coils having spatial orthogonality.

[0029] The above-mentioned multiple superimposed feed coils can be formed from heterogeneous coils having phase orthogonality.

[0030] Preferably, the magnitude of each inverter current is also controlled together.

[0031] According to another aspect of the present invention, a multi-segment power distribution system is provided for distributing power to multiple segments, comprising: multiple segments composed of multiple power supply coils; multiple inverters independently connected to each power supply coil; and a control unit independently controlling the current phase of the multiple inverters, wherein the control unit comprises: a) means for adjusting the current phase of the inverters according to the charging requirement of each segment; and b) means for enabling optimal power distribution according to the power requirement of a charging vehicle, such as supplying power intensively to a specific segment or distributing power evenly to multiple segments, and efficiently performing power distribution between multiple segments during both driving charging and stopping charging.

[0032] The above-mentioned multiple overlapping feed coils can be formed from coils of the same shape.

[0033] The above-mentioned multiple overlapping feed coils can be formed from heterogeneous coils having spatial orthogonality.

[0034] The above-mentioned multiple superimposed feed coils can be formed from heterogeneous coils having phase orthogonality.

[0035] Preferably, it is also good to control the magnitude of each inverter current together.

[0036] The present invention provides the following effects based on multi-inverter control and a multi-overlapping feed coil structure.

[0037] - Improved charging efficiency while driving: Energy transfer efficiency is significantly enhanced because specific segments can be rapidly activated or deactivated through inverter phase control, despite the vehicle's high speed.

[0038] - Increased charging flexibility while stationary: Power can be precisely distributed to each slot according to the demands of charging vehicles, preventing power waste and maximizing charging efficiency. Additionally, energy consumption is minimized by cutting off power supply to slots without charging vehicles.

[0039] - Flexible power control and distribution: By controlling only the phase of the current or controlling both the phase and magnitude using multiple inverters, power can be distributed evenly to four segments or concentrated on specific segments, allowing for response to various charging scenarios.

[0040] - Minimization of switching time: Compared to conventional sensor-based switch control methods, inverter current phase control operates rapidly, reducing time delays during the charging process and improving charging quality.

[0041] - Adaptability to various battery sizes: Even when the battery size and charging requirements of electric vehicles differ, the present invention can efficiently support charging.

[0042] - Hardware cost reduction: Hardware complexity can be reduced by eliminating the need for separate switches, and system construction and operation costs can be lowered through the use of multiple small inverters.

[0043] The present invention can not only increase the efficiency of electric vehicle wireless charging infrastructure but also simultaneously provide flexibility and economic efficiency that can adapt to various charging environments.

[0044]

[0045] Figure 1 is a conceptual diagram illustrating a conventional single-coil segmentation method, showing an existing method in which the corresponding track is turned ON / OFF via a switch as a vehicle enters.

[0046] Figure 2 is a diagram showing a segmentation method that controls multiple coils using two conventional inverters, and shows a segment control method during charging while driving and charging while stopped.

[0047] Figure 3 is a diagram showing the process in which the induced voltage and power change according to the phase difference of the inverter current in the method illustrated in Figure 2, and explains power distribution utilizing the phase difference.

[0048] FIG. 4 is a diagram showing an example of a four-segment power supply line composed of four coils according to the present invention and a four-coil overlapping structure within one segment, showing that independent current control of each coil is possible.

[0049] FIG. 5 is a diagram showing an inverter structure for independently controlling four coils according to the present invention, and explains the connection method between each coil and the inverter.

[0050] Figure 6 is a diagram showing the change in induced voltage according to the phase difference (θ) in the present invention, showing the distribution of induced voltage by segment according to the phase difference adjustment.

[0051] FIG. 7 is a diagram showing the change in power distribution according to the phase difference (θ) in the present invention, and explains the process of adjusting the amount of power delivered to each segment.

[0052] FIG. 8 is a drawing showing the actual configuration of a multi-coil as a specific embodiment of the present invention, illustrating a structure in which four coils are arranged in one slot (segment).

[0053] FIG. 9 is a diagram showing a wireless charging circuit configuration including one inverter as a specific embodiment of the present invention, and explains the method in which the inverter supplies power to the power supply coil.

[0054] FIG. 10 is a specific embodiment of the present invention, showing the induced voltage and power change when two segments are activated, and showing the power distribution according to the phase difference (θ).

[0055] FIG. 11 is a specific embodiment of the present invention, illustrating the induced voltage of a current collector when all four segments are activated, and explains the voltage induced in each segment.

[0056] FIG. 12 is a specific embodiment of the present invention, showing the charging power of a current collector when all four segments are activated, and shows the power distribution result according to the power supply current phase control.

[0057] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely one preferred embodiment of the present invention and do not represent all aspects of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0058] As used herein, "segment" and "slot" represent the same concept and refer to a power supply section or a charging unit. Specifically, "segment" is primarily used in technical and structural terms and refers to a power distribution unit in dynamic or static charging environments. On the other hand, "slot" is used in contexts emphasizing a parking space or physical location to allow for intuitive understanding by the user. While the term "segment" is primarily used throughout the specification, the term "slot" may be used in parallel in specific situations. In such cases, both terms should be considered to represent the same concept.

[0059]

[0060] FIG. 4 is a drawing showing a four-segment power supply line composed of four coils according to the present invention and a four-coil overlapping structure in one segment, where FIG. 4(a) is a drawing showing the power supply line configuration of the present invention and FIG. 4(b) is a drawing showing an example of a four-coil overlapping structure in one segment in the present invention.

[0061] Figure 4(a) shows a structure in which the power supply line is divided into four segments (Segment 1 to Segment 4). Each segment consists of four power supply coils (A, B, C, D), each connected to a small inverter and controlled independently. This figure highlights that the design allows each coil to operate independently of the others. In particular, Figure 4(a) shows a configuration designed to maintain the coupling coefficient between coils close to zero to minimize electromagnetic interference between segments. For example, in Segment 1 and Segment 2, coils A and B are coupled with opposite polarity, and in the same way, coils C and D are coupled with opposite polarity in Segment 3 and Segment 4. This allows each coil to be controlled independently without being affected by the current of other coils. The structure in Figure 4(a) is designed to enable or disable the appropriate segment depending on the vehicle's position during dynamic charging or static charging, thereby increasing charging efficiency and reducing energy loss.

[0062] Figure 4(b) shows in detail an example of a configuration in which coils A, B, C, and D are superimposed on each segment. This figure illustrates that space efficiency can be maximized and system miniaturization can be achieved through a multi-superposition coil structure. In particular, Figure 4(b) indicates the arrangement of coils A, B, C, and D and the direction of current flow with arrows, allowing for an intuitive understanding of the operating principle of each coil. This structure can also be effectively utilized in static charging and can operate by distributing power evenly to each segment or supplying concentrated power to a specific segment. Furthermore, in this example, the capacity of each inverter coil is reduced to approximately one-quarter of that of a single inverter and coil configuration, thereby lowering hardware complexity and reducing manufacturing and operating costs. The four coils can flexibly supply the power required by each segment through precise current control.

[0063] Figure 4 illustrates an example of a multiple-coil-based segment structure and a multiple-overlapping coil structure in one segment, which is the core of the present invention, and also shows a practical application example of a power distribution method utilizing the same.

[0064]

[0065] FIG. 5 is a diagram showing an inverter structure designed to drive four overlapping power supply coils (A, B, C, D) in the present invention, and consists of four small inverters configured so that each coil can be controlled independently. This structure provides the ability to activate or deactivate a specific segment by individually adjusting the phase of the current flowing in each coil.

[0066] Table 1 shows the activation status of the segments generated according to the current flow direction (phase) of each coil (A, B, C, D). According to Table 1, the desired segment can be activated or deactivated by adjusting the current direction flowing through the four coils.

[0067] ABCD segment 1 segment 2 segment 3 segment 4000040001111-40001010040001010-400110000-4000110040011000041001000-4

[0068] for example:

[0069] - Segment 1 is activated when current flows in the same forward or reverse direction through coils A, B, C, and D.

[0070] - Segment 3 is activated when current is passed in the same direction through coils A and B, and in the opposite direction through coils C and D.

[0071] In this way, the current flow of each coil is controlled by the inverter structure of FIG. 5, thereby achieving the following effects:

[0072] - Precise segment activation: Only specific segments can be selectively activated according to the combination of current flows presented in Table 1. This means that energy transfer efficiency can be maximized by activating or deactivating appropriate segments depending on the vehicle's position during dynamic charging.

[0073] - Flexible power distribution: It can respond to various charging scenarios, such as concentrating power on a specific segment or distributing power evenly across multiple segments. In static charging, it can supply power only to the slot where the charging vehicle is located or accurately distribute the power required for each slot.

[0074] - Switch-free control implementation: While conventional switch-based segment activation methods could result in hardware complexity and delays, the inverter structure of the present invention activates segments solely through current phase control, thereby providing hardware simplification and efficiency.

[0075] Figure 5 and Table 1 provide the essential technical basis for realizing the switching and power distribution of multiple superimposed feed coils in the present invention, and demonstrate that this can overcome the disadvantages of existing systems and maximize charging efficiency.

[0076]

[0077] For charging while stationary, only one of the four segments can be selected, but charging power can be distributed in various ways to each segment. Various methods can be used for charging while stationary; below, regarding the case of the first row of Table 1, current i A , i B This explains the case where the phase is adjusted as follows:

[0078] i A = I m cos(wt+θ), i B = I m cos(wt-θ), i C = i D = I m coswt.

[0079] Since the magnitude and phase of the feed current can be freely controlled, the magnetic flux density in each coil of Segment 1 due to these currents is as follows:

[0080] B 1A = B m cos(wt+θ), B 1B = B m cos(wt-θ), B 1C = B 1D = B m coswt

[0081] Therefore, the combined magnetic flux density in segment 1 is as follows:

[0082] B1= 2B m (1+cosθ)coswt

[0083] In the same way, the combined magnetic flux density of segments 2 through 4 is calculated as follows:

[0084] B2= B4= -2Bm sinθsinwt

[0085] B3 = 2B m (-1+cosθ)coswt

[0086] Therefore, the induced voltage at the pickup placed on segment 1 is as follows:

[0087] V 1pk = 2wM pk I m (1+cosθ)cos(wt+π / 2)

[0088] In the same way, the induced voltage at the pickups placed on segments 2–4 is as follows:

[0089] V 2pk = V 4pk = -2wM pk I m sinθcoswt

[0090] V 3pk = 2wM pk I m (1-cosθ)sinwt

[0091] In Fig. 6, the induced voltage is 2M pk I m The RMS voltage normalized with respect to is shown. The output (average power) obtained by applying the voltage shown in Fig. 6 to the resistor (R) is shown in Fig. 7, where the power is 2(ωM pk I m ) 2 It is normalized with respect to / R. Looking at the power, three levels appear, and it can be seen that their ratio can be adjusted according to the phase shift θ. Therefore, we can see that four segments can be charged at three different power levels. In the explanation above, only the phase of the currents in two coils was adjusted; however, adjusting the phases of the currents in the remaining two coils enables even more diverse forms of power distribution.

[0092]

[0093] 4-segment switching

[0094] FIG. 8 is a diagram showing the structure of a power supply segment utilizing multiple overlapping coils as a specific embodiment of the present invention. In this embodiment, four power supply coils (A, B, C, D) are arranged in an overlapping manner in one slot, and this structure is suitable for both dynamic charging and static charging while the vehicle is stopped.

[0095] In each segment, four coils are arranged in overlapping positions, and each coil is connected to a small inverter to control the current independently. The coil arrangement is designed to maximize space efficiency while minimizing mutual inductance, allowing each coil to operate independently.

[0096] In FIG. 8, coils of the same shape can be used as multiple superposition coils, such as a circular coil, a vertical / horizontal DD coil, a modified circular coil, a modified DD coil, or a coil with a mixed structure of a circular coil and a DD coil. In addition, it is evident that coils of different shapes that are not of the same shape, such as those with X-axis / Y-axis / Z-axis spatial orthogonality or those with phase orthogonality, can be used as multiple superposition coils because there is no interference between the coils, allowing for independent control.

[0097] FIG. 9 is a diagram showing a wireless charging circuit configuration including one inverter as a specific embodiment of the present invention. This embodiment operates by controlling the current through a single inverter connected to one of four overlapping feed coils (A, B, C, D).

[0098] The present embodiment relating to the switching of four segments provides a basic circuit configuration for independently controlling the current of each coil in a multi-coil system. Here, the feed current supplied from the inverter to each coil is defined as follows:

[0099] i A = I m cos(ωt+θ A ),

[0100] i B = I m cos(ωt+θ B ),

[0101] i C = I m cos(ωt+θ C ),

[0102] i D = I m cos(ωt+θ D ).

[0103] This formula indicates that the current magnitude and phase of each coil can be adjusted independently, allowing specific segments to be activated or deactivated.

[0104] The circuit presented in Fig. 9 can activate or deactivate specific segments by adjusting the current phase of each coil. For example, a desired segment can be activated by adjusting the phase value as follows:

[0105] - Segment 1 active: θ A = θ B = θ C = θ D = 0;

[0106] - Segment 2 activation: θ A = θ C = 0, θ B = θ D = π;

[0107] - Segment 3 active: θ A = θ B = 0, θ C = θ D = π;

[0108] - Segment 4 active: θ A = θ D = 0, θ B = θ D = π.

[0109] Unlike existing switch-based activation methods, this method activates segments solely through inverter phase control, thereby eliminating complex hardware configurations that use switches.

[0110] This method according to the present invention has the following advantages:

[0111] - Independent current control: By controlling the current independently for each coil, power can be concentrated on a specific segment or distributed evenly across multiple segments.

[0112] - Applicable to both driving and stationary charging: Depending on the vehicle's location, segments can be rapidly activated in Dynamic Charging, or power can be flexibly distributed to each charging slot in Static Charging.

[0113] - Improved Efficiency: Minimizes switch-over delays and energy losses associated with conventional methods, enabling fast and accurate power distribution with simple inverter control.

[0114]

[0115] Switching and power distribution

[0116] Below, we consider a case where power is distributed only to the segment where the vehicle has entered, and power is not applied to the remaining segments. First, power can be distributed to each segment using phase values ​​while activating two segments and deactivating the remaining segments.

[0117] Table 2 shows a method of performing segment-by-segment power distribution by adjusting the activation state and phase value of four feed coils (A, B, C, D).

[0118] Active state (ABCD) A Phase B Phase C Phase D Phase 1100θ-θθ-θ1010θθ-θ-θ1001θ-θ-θθ0110θ-θπ-θπ+θ0101θπ+θ-θπ-θ0011θ-θπ+θπ-θ

[0119]

[0120] As an example, θ in Table 2 A = θ C = 0, θ B = θ D In the case where = -θ, the voltage induced in the current collector is as follows:

[0121] V slt1 = 4ωM pk I m cosθcos(ωt-θ),

[0122] V slt2 = 4ωM pk I m sinθcos(ωt+π-θ).

[0123] Therefore, the power consumed by the resistive load is as follows:

[0124] P slt1 = V slt1 V slt1 / R,

[0125] P slt2 = V slt2 V slt2 / R,

[0126] V slt1 = 2 ωM pk Im cos(θ / 2),

[0127] V slt2 = 2 ωM pk Im cos((π-θ / 2) / 2)

[0128] Figure 10 shows the induced voltage and power when two segments are ON.

[0129] FIG. 10(a) is a graph showing the change in induced voltage when two segments are activated, visually showing how the induced voltage is distributed according to the change in phase difference θ. When the phase difference θ is zero (0), the induced voltage is concentrated in a specific segment, and when the value of the phase difference θ is increased, the induced voltage is distributed to other segments.

[0130] Figure 10(b) is a graph showing the change in power distribution with two segments activated, illustrating how the amount of power delivered to each segment changes according to the phase difference θ value. This graph shows that power can be supplied intensively to a specific segment or distributed evenly to two segments by adjusting the phase difference θ.

[0131]

[0132] FIGS. 11 and 12 are diagrams showing the voltage and charging power induced in the current collector of each segment when all four segments are activated. This embodiment specifically describes a method for flexibly distributing power between segments by adjusting the phase difference of the current flowing through four power supply coils (A, B, C, D).

[0133] If you want to distribute equal power to 4 segments, you must set the value of θ as follows: θ A = θ B = 0, θ C = π / 2, θ D = -π / 2.

[0134] In the case of wanting to distribute arbitrary power to 4 segments, θ A , θ B , θ C , θ D The phase value can be determined using numerical analysis or artificial intelligence techniques, or it can be found by selecting the θA value from a similar scenario among the θ values ​​used in several major charging scenarios and performing iterative calculations in that vicinity. For example, in the case of distributing arbitrary power, θ A = θ B = θ2, θ C = θ1, θ D = -θ1, etc. can be used.

[0135] In the above description, the load was assumed to be a resistive load, but in actual battery charging, the load side has a function to adjust the current, so the charger only needs to provide the magnetic flux within the range desired by the battery, so there is no problem even if the charger does not strictly distribute power.

[0136]

[0137] Although the above description explained a method for distributing power based on the phase of each inverter current, it is evident that more precise power distribution is possible by controlling the magnitude along with the phase of each inverter current.

Claims

A multi-segment switching method comprising multiple inverters and multiple overlapping feed coils, wherein the inverters connected to each coil are controlled to selectively activate or deactivate specific segments. a) supplying current through multiple inverters independently connected to each feed coil; b) A step of generating an induced voltage in a selected segment by adjusting the current phase of each inverter Includes, A segment switching method in which the adjustment of the above current phase is performed to concentrate the induced voltage on a selected segment and prevent the induced voltage from occurring in an inactive segment. In claim 1, A segment switching method characterized in that the above-mentioned multiple overlapping feed coils are formed from coils of the same shape. In claim 1, The above-mentioned multiple overlapping feed coil is formed of heterogeneous coils having spatial orthogonality. A segment switching method characterized by the following. In claim 1, The above-mentioned multi-overlapping feed coil is formed of heterogeneous coils having phase orthogonality. A segment switching method characterized by the following. In claim 1, The above switching groups segments according to the vehicle's movement speed and activates them in group units. A segment switching method characterized by the following. As a system for switching multiple segments, Multi-segment composed of multiple feed coils; Multiple inverters independently connected to each feed coil; and A control unit that independently controls the current phase of multiple inverters Includes, The above control unit is, a) means for adjusting the current phase of each inverter to concentrate the induced voltage on a selected segment; and, b) Means for controlling the current phase of each inverter so that no induced voltage is generated in the deactivated segment Includes, A segment switching system that activates or deactivates a specific segment solely by phase control of the inverter current without using additional switches during the switching process. In claim 6, The above-mentioned multi-feed coil is formed from coils of the same shape. A segment switching system characterized by the following. In claim 6, The above multi-feed coil is formed of heterogeneous coils having spatial orthogonality. A segment switching system characterized by the following. In claim 6, The above multi-feed coil is formed of heterogeneous coils having phase orthogonality. A segment switching system characterized by the following. In claim 6, The above switching groups segments according to the vehicle's movement speed and activates them in group units. A segment switching system characterized by the following. A method for distributing power between multiple segments by controlling the phase of the current flowing through each feed coil in a system composed of multiple inverters and multiple superimposed feed coils, a) supplying current through multiple inverters independently connected to each feed coil; b) a step of selectively activating and deactivating each segment by adjusting the phase of each inverter current; and, c) A step of controlling the amount of power distributed to each segment according to the power requirements of the charging vehicle Includes, A multi-segment power distribution method in which the adjustment of the above current phase is performed to enable optimal power distribution according to the power requirements of a charging vehicle, such as concentrating power supply to a selected segment or distributing power evenly to all segments. In claim 11, The above-mentioned multiple overlapping feed coil is formed from coils of the same shape. A multi-segment power distribution method characterized by the following. In claim 11, The above-mentioned multiple overlapping feed coil is formed of heterogeneous coils having spatial orthogonality. A multi-segment power distribution method characterized by the following. In claim 11, The above-mentioned multi-overlapping feed coil is formed of heterogeneous coils having phase orthogonality. A multi-segment power distribution method characterized by the following. In claim 11, Controlling the magnitude of each inverter current as well A multi-segment power distribution method characterized by the following. As a system for distributing power to multiple segments, Multi-segment composed of multiple feed coils; Multiple inverters independently connected to each feed coil; and, A control unit that independently controls the current phase of multiple inverters Includes, The above control unit is, a) means for adjusting the current phase of the inverter according to the charging requirement of each segment; and, b) Means for enabling optimal power distribution according to the power requirements of the charging vehicle, such as supplying power intensively to a specific segment or distributing power evenly to multiple segments. Equipped with, A multi-segment power distribution system that efficiently performs power distribution between multiple segments during both driving and stationary charging. In claim 16, The above-mentioned multiple overlapping feed coil is formed from coils of the same shape. A multi-segment power distribution system characterized by the following. In claim 16, The above-mentioned multiple overlapping feed coil is formed of heterogeneous coils having spatial orthogonality. A multi-segment power distribution system characterized by the following. In claim 16, The above-mentioned multi-overlapping feed coil is formed of heterogeneous coils having phase orthogonality. A multi-segment power distribution system characterized by the following. In claim 16, Controlling the magnitude of each inverter current as well A multi-segment power distribution system characterized by the following.

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