Charger having coil structure capable of selectively establishing connection between respective layers of coil having multi-layer structure or between plurality of coil elements in series manner or parallel manner, and coil structure

Abstract

The present invention relates to a wireless charger for charging an electric vehicle, the wireless charger comprising: a supply equipment communication controller (SECC) module which communicates with an electric vehicle communication controller (EVCC) module of an electric vehicle; and a wireless charging transmission unit for charging the electric vehicle on the basis of the communication, wherein: the wireless charging transmission unit comprises a transmission coil for supplying power to the electric vehicle; the transmission coil comprises a coil having a multi-layer structure including a plurality of coil elements; and the SECC module is configured to selectively establish a connection between respective layers of the coil having the multi-layer structure or between the plurality of coil elements in a serial manner or a parallel manner.

Description

A charger and coil structure having a coil structure in which each layer of a coil having a multilayer structure or a connection between multiple coil elements can be selectively connected in a series or parallel manner.

[0001] The present invention relates to a charger and a coil structure having a coil structure in which each layer of a coil having a multilayer structure or a connection between a plurality of coil elements can be selectively connected in a series or parallel manner.

[0002] As the proliferation of electric vehicles (EVs) increases, the need for fast and efficient charging technology is growing. In particular, there is a growing demand for charging systems that maximize power efficiency while flexibly adapting to diverse charging environments. Existing wireless charging systems for electric vehicles typically employ a three-phase coil structure, which utilizes magnetic induction between a transmitting coil (Ground Assembly, GA) and a receiving coil (Vehicle Assembly, VA) to transfer power. However, this three-phase structure has limitations: the charging method is fixed and only allows for either series or parallel charging.

[0003] The present invention aims to solve the problem that the existing three-phase structure limited the charging method by allowing only one selection between series or parallel.

[0004] The present invention aims to solve the problem that in a two-layer structure according to an existing three-phase structure, only an increase in voltage or current is possible, and thus the flexibility of the charging method is lacking.

[0005] The present invention aims to solve the problem that it was difficult to apply a three-layer structure according to the existing three-phase structure, and thus the method of increasing charging efficiency in a multi-layer structure was limited.

[0006] The present invention relates to a wireless charger for charging an electric vehicle, comprising: a SECC (Supply Equipment Communication Controller) module for communicating with an EVCC (Electric Vehicle Communication Controller) module of the electric vehicle; and a wireless charging transmitter for charging the electric vehicle based on the communication; wherein the wireless charging transmitter includes a transmitting coil for supplying power to the electric vehicle; and wherein the transmitting coil includes a coil having a multilayer structure including a plurality of coil elements; and the SECC module is configured to selectively connect each layer of the coil having the multilayer structure or the connection between the plurality of coil elements in a series manner or a parallel manner.

[0007] In addition, the SECC module controls the transmitting coils of each layer to maintain the same current when connecting each layer of the coil having the multilayer structure or the connection between the plurality of coil elements in a serial manner.

[0008] In addition, the SECC module controls the transmitting coils of each layer to maintain the same voltage when connecting each layer of the coil having the multilayer structure or the connection between the plurality of coil elements in a parallel manner.

[0009] In addition, the wireless charging transmitter further includes a power conversion device, and the power conversion device is configured to adjust voltage and current supplied to the coil having the multilayer structure.

[0010] The present invention relates to a wireless charging system including an electric vehicle and a charger for charging the electric vehicle, comprising: the electric vehicle; and the charger; wherein the charger includes an SECC module for communicating with an EVCC module of the electric vehicle; and a wireless charging transmitter for charging the electric vehicle based on the communication; wherein the wireless charging transmitter includes a transmitting coil for supplying power to the electric vehicle; wherein the transmitting coil includes a coil having a multilayer structure including a plurality of coil elements; and wherein the SECC module is configured to selectively connect each layer of the coil having the multilayer structure or the connection between the plurality of coil elements in a series manner or a parallel manner.

[0011] In addition, the SECC module controls the transmitting coils of each layer to maintain the same current when connecting each layer of the coil having the multilayer structure or the connection between the plurality of coil elements in a serial manner.

[0012] In addition, the SECC module controls the transmitting coils of each layer to maintain the same voltage when connecting each layer of the coil having the multilayer structure or the connection between the plurality of coil elements in a parallel manner.

[0013] In addition, the wireless charging transmitter further includes a power conversion device, and the power conversion device is configured to adjust voltage and current supplied to the coil having the multilayer structure.

[0014] The present invention relates to a transmission coil structure of a wireless charger for charging an electric vehicle,

[0015] A coil having a multilayer structure including one or more single units; and a plurality of coil elements connected to each of the one or more single units; wherein the coil having a multilayer structure including the plurality of coil elements is configured to selectively connect each layer of the coil having the multilayer structure or the connection between the plurality of coil elements in a series manner or in a parallel manner.

[0016] The present invention provides the effect of freely selecting a series or parallel connection method according to the charging environment and the battery specifications of the vehicle.

[0017] The present invention provides the effect of operating in a series manner that can increase voltage according to the charging environment or in a parallel manner that can increase current even in a three-layer structure.

[0018] The present invention provides the effect of increasing the flexibility of the charging method by utilizing three layers to generate a higher voltage or supply a higher current.

[0019] The present invention provides the effect of preventing overload of power semiconductors and increasing stability by enabling the use of high voltage while limiting current through series connection.

[0020] The present invention provides the effect of reducing excessive voltage burden on power semiconductors by increasing current while maintaining a constant voltage through parallel connection.

[0021] FIG. 1a is a drawing for explaining wireless charging between a battery and a charger of an electric vehicle according to the present invention.

[0022] Figure 1b is a drawing for explaining the configuration of a wireless charging system according to the present invention.

[0023] Figure 2 is a drawing for explaining a problem with a transmitter coil of an existing wireless charging system.

[0024] FIG. 3 is a drawing for explaining a series / parallel capable coil structure according to one embodiment of the present invention.

[0025] FIG. 4 is a drawing for explaining an embodiment in which a transmitting coil according to the present invention has a two-layer structure.

[0026] FIG. 5 is a drawing for explaining an embodiment in which a transmitting coil according to the present invention has a three-layer structure.

[0027] Specific details of the embodiments are included in the detailed description and drawings.

[0028] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0029] FIG. 1a is a diagram illustrating wireless charging between an electric vehicle battery and a charger according to the present invention. FIG. 1b is a diagram illustrating the configuration of a wireless charging system according to the present invention.

[0030] According to the present invention, wireless charging between the battery of an electric vehicle (10) and a charger (20) is based on the principle of electromagnetic induction. Specifically, the transmitting coil (21-1) of the wireless charging transmitter (21) generates a magnetic field, and the receiving coil (11-1) of the wireless charging receiver (11) receives power through the magnetic field to charge the battery. In this process, alignment between the transmitting coil (21-1) of the wireless charging transmitter (21) and the receiving coil (11-1) of the wireless charging receiver (11) is required, and must be confirmed to reduce energy loss and ensure efficient wireless charging. Here, the wireless charging transmitter (21) includes a charging pad, and the wireless charging transmitter (21) can transmit power to the receiving coil (11-1) of the electric vehicle (10) through a wireless power transmission technology such as a magnetic induction method or a magnetic resonance method. At this time, the wireless charging transmitter (21) is connected to a power conversion device to generate an alternating current, and can generate a magnetic field with this current to transmit energy to the electric vehicle (10).

[0031] According to the present invention, the wireless charging receiver (11) is mounted on the lower part of the electric vehicle (10) and can receive a magnetic field generated by the wireless charging transmitter (21) through the receiving coil (11-1). At this time, the received power is converted into a form suitable for the battery through a power conversion circuit within the wireless charging transmitter (21) and can then be used to charge the battery of the electric vehicle (10). At this time, the power transmission efficiency between the receiving coil (11-1) and the transmitting coil (21-1) varies greatly depending on not only the alignment of the coils but also the design of the transmitting coil (21-1).

[0032] According to the present invention, the wireless charging transmitter (21) may include a transmitting coil (21-1), and each transmitting coil (21-1) may include a coil (110). Here, the transmitting coil (21-1) may generate a magnetic field, and may be designed as a plurality of layers of each coil (110), and each layer composed of each coil (110) may be connected in series or in parallel. Through this, the transmitting coil (21-1) may operate flexibly under various power transmission conditions.

[0033] According to the present invention, the transmitting coil (21-1) can be placed on the ferrite layer (21-2), which is a main component of the wireless charging transmitter (21). In addition, the transmitting coil (21-1) is protected by an insulating layer (21-3), and the outer cover (21-4) of the charging pad can serve to protect the coil and the internal circuit from the external environment. Specifically, the ferrite layer (21-2) can be mainly composed of a ferrite material having a high permittivity and a low loss factor, and the ferrite material has the characteristics of minimizing the loss that occurs when a magnetic field passes through the inside of the ferrite layer and lowering the magnetic resistance, thereby enabling efficient power transmission. That is, the ferrite layer (21-2) can be positioned directly below the transmitting coil (21-1), and can serve to concentrate the magnetic field generated by the coil, and can also form a laminated structure together with another insulating layer (21-3) or a protective cover (21-4) inside the wireless charging transmitter (21).

[0034] As illustrated, in order to ensure efficient operation of the wireless charging system, communication between the transmitting coil (21-1) and the receiving coil (11-1) may be performed via an Electric Vehicle Communication Controller (EVCC) module (12). Specifically, the EVCC module (12) controls the charging session of the electric vehicle (10) and the charger (20), and may monitor the charging status in real time. In addition, the charger (20) includes a Supply Equipment Communication Controller (SECC) module (22), and the charger (20) may adjust the charging process through communication between the EVCC module (12) and the SECC module (22). Specifically, the SECC module (22) is a control module responsible for communication with the EVCC module (12) of the electric vehicle (10) on the charger (20) side, and may manage the power supply of the charger (20) and adjust the charging status through data exchange with the EVCC module (12). Through this, the power supply may be adjusted according to the battery charging status of the electric vehicle (10). That is, the wireless charging system of the present invention can provide high energy transfer efficiency and stable charging through the design and alignment of the transmitting coil (21-1) and the receiving coil (11-1), and efficient charging control through the EVCC module (12) and the SECC module (22).

[0035] As illustrated in FIG. 1B, the wireless charging system of the present invention includes an electric vehicle (10) and a charger (20). Specifically, the electric vehicle (10) includes a wireless charging receiver (11) that receives a magnetic field generated from a transmitting coil (21-1), converts it into electric power, and transmits the received electric power to a BMS module (Battery Management System, 14). Specifically, the BMS module (14) is a system that manages a battery pack (15) of the electric vehicle (10) and can monitor the state of charge (SOC), temperature, voltage, current, etc. of the battery pack (15). In addition, the display unit (13) can provide the driver with the charging state, battery state, charging time, etc. in real time, and the battery pack (15) can store the converted electric power and use it as an energy source for driving the electric vehicle (10), and the temperature sensor (16) can monitor the temperature of the battery and the system during charging and adjust or stop charging when overheating occurs. Additionally, the charger (20) may include an uninterruptible power supply (UPS) module (23) and a link capacitor (24). Specifically, the UPS module (23) may function as an emergency power supply device and temporarily replace the role of the link capacitor (24) when an external power supply is interrupted.

[0036] The present invention can provide a wireless charger (20) for charging an electric vehicle (10). Specifically, the charger (20) includes an SECC module (22) that communicates with an EVCC module (12) of an electric vehicle (10) and a wireless charging transmitter (21) that charges the electric vehicle (10) based on the communication. At this time, the wireless charging transmitter (21) includes a transmitting coil (21-1) for supplying power to the electric vehicle (10), and the transmitting coil (21-1) includes one or more coils (110), and the one or more coils (110) are configured such that their phases are not fixed.

[0037] Figure 2 is a drawing for explaining a problem with a transmitter coil of an existing wireless charging system.

[0038] As illustrated in (a) of FIG. 2, the transmitting coil (21-1) of the wireless charging transmitter (21) includes each coil (110). Specifically, in the arrangement of the coils (110) of FIG. 2 (a), it can be seen that phases A, B, and C are alternately arranged on the first layer, and each phase is fixed, making it difficult to change or adjust the phases as needed. In addition, each phase is surrounded by a ferrite core, and the physical spacing between the coils (110) is evenly distributed. That is, the coils (110) of FIG. 2 (a) are arranged in a symmetrical and repetitive form, which makes manufacturing and assembly simple, makes it easy to predict power transmission efficiency, and has the advantage of being practical in the initial design and implementation stages. In addition, the coils (110) of FIG. 2 (a) can uniformly generate magnetic flux in one layer due to their symmetrical structure.

[0039] However, according to the present invention, the transmission coil (21-1) of the existing wireless charging transmitter (21) is structured in a way that it cannot flexibly implement series / parallel driving of the coil (110) through phase control. In addition, due to the fixed phase position of each coil (100), flexibility in alignment in the X and Y directions is reduced, and charging efficiency may decrease.

[0040] According to the present invention, the coil (110) of Fig. 2 (a) has phases A, B, and C physically fixed, so that when multiple layers are stacked, the phases at the same position may overlap each other, concentrating or canceling the magnetic field. In addition, the coil (110) of Fig. 2 (a) has phases A, B, and C physically fixed, so that when multiple layers are stacked, interference between phases may occur, making it difficult to drive in series between layers, and thus making it difficult to obtain the effect of increasing the voltage. In addition, although the coil (110) of Fig. 2 (a) is evenly arranged on the ferrite core, there is a possibility that the path of the magnetic flux may be distorted when multiple layers are stacked. That is, the coil (110) of Fig. 2 (a) has a disadvantage in that the magnetic flux paths between phases arranged at the same position in each layer may overlap each other, or conversely, the magnetic flux may be canceled, and such distortion of the magnetic flux reduces the power transfer efficiency and makes the alignment of the charging region more difficult.

[0041] According to the present invention, the coil (110) of Fig. 2 (a) has phases A, B, and C physically fixed, and thus cannot be adjusted in accordance with the relative positions or alignment of the charging areas. Accordingly, even a slight misalignment of the phases causes the current path to become inefficient, and there is a disadvantage in that the intended voltage increase effect cannot be achieved in a series connection.

[0042] As illustrated in (b) of FIG. 2, the transmitting coils (21-1) of the wireless charging transmitter (21) each include a coil (110). Specifically, in the coil (110) of FIG. 2 (b), the phases are arranged in a structure in which they intersect each other as A, B, and C, similar to the coil (110) of FIG. 2 (a). Specifically, in the coil (110) of FIG. 2 (b), the phases are arranged in three phases as A, B, and C on the first and second layers, respectively, and since the coils of the first and second layers do not physically overlap, there is an advantage in that interference (magnetic flux cancellation) between the same phases does not occur.

[0043] However, according to the present invention, the coil (110) of Fig. 2 (b) has a fixed phase, and thus cannot dynamically change the phase as needed. Accordingly, the coil (110) of Fig. 2 (b) has a disadvantage in that it increases the possibility of magnetic flux cancellation or imbalance occurring depending on the relative position (alignment) of the charging area. That is, the coil (110) of Fig. 2 (b) may have a reduced charging efficiency in series / parallel connection in the X and Y directions, and has a disadvantage in that flexible phase control is impossible.

[0044] According to the present invention, the coil (110) of Fig. 2 (b) has a disadvantage in that it is difficult to connect the same phases in series due to the complex structure in which the phases are arranged in different positions in the first and second layers. Here, in order to perform serial operation by layer, the same phases (A phases, B phases, etc.) must be connected in series, but in the case of the coil (110) of Fig. 2 (b), even if multiple layers are stacked, the same phases are not aligned, so it is difficult to expect a voltage increase effect through serial operation in the Z direction. That is, since the coil (110) of Fig. 2 (b) does not have a physically overlapping portion, the current cannot flow sequentially, and thus the advantage of serial operation cannot be utilized, making it difficult to meet high-voltage requirements and limiting design flexibility.

[0045] According to the present invention, the coil (110) of Fig. 2 (b) has a complex magnetic flux path due to the interphase cross-arrangement, and the magnetic flux may be concentrated or weakened in specific areas. This causes the magnetic flux paths between layers to not overlap effectively, thereby reducing power transmission performance. In multi-layer designs, the magnetic flux concentration effect is reduced, and charging efficiency is reduced.

[0046] According to the present invention, the coil (110) of Fig. 2 (b) has a disadvantage in that interference may occur when driving in series / parallel between layers due to physical intersection between the same phases, and the phase is fixed, so that collisions cannot be prevented or efficiency cannot be optimized by adjusting the phase between layers. That is, in the design between layers in the Z direction, charging efficiency and power stability are reduced due to interference problems, and since the phase is fixed, there is a problem in that the phase cannot be changed or adjusted through control, so that positional errors and imbalances that may occur in various charging environments cannot be corrected.

[0047] As illustrated in (c) of FIG. 2, the transmitting coil (21-1) of the wireless charging transmitter (21) includes each coil (110). Specifically, the coils (110) of FIG. 2 (c) are arranged in a complex shape in which the phases physically intersect, with two A phases arranged in the first layer, two B phases in the second layer, and two C phases in the third layer, so that the phases are not repeated for each layer but are separated. Since the same phases are not arranged for each layer but are separated, the problem of magnetic flux cancellation between the same phases between layers is reduced, and by setting the phases differently for each layer, the magnetic field interference between layers is minimized, and it can be confirmed that the arrangement of the coils (110) is designed in multiple layers. However, the coil (110) of Fig. 2 (c) has a phase that is fixed by layer, so the phase cannot be adjusted or changed as needed, it is difficult to respond to changes in the relative positions of the charger (20) and the electric vehicle (10), and there is a disadvantage in that flexibility is low in series / parallel driving in the X, Y, and Z directions.

[0048] According to the present invention, the coil (110) of Fig. 2 (c) has a problem that, due to the structure in which different phases are arranged in each layer, it is difficult to connect the same phases in series, it is difficult to expect a voltage increase effect in the Z direction, and inefficiency may occur in current distribution. In addition, the coil (110) of Fig. 2 (c) has a problem in that, since different phases are arranged in each layer, the magnetic flux may be dispersed in the path or flow inefficiently, resulting in a decrease in charging efficiency.

[0049] FIG. 3 is a drawing for explaining a series / parallel capable coil structure according to one embodiment of the present invention.

[0050] The present invention can provide a wireless charger (20) for charging an electric vehicle (10). Specifically, the charger (20) includes an SECC module (22) that communicates with an EVCC module (12) of an electric vehicle (10) and a wireless charging transmitter (21) that charges the electric vehicle (10) based on the communication. At this time, the wireless charging transmitter (21) includes a transmitting coil (21-1) for supplying power to the electric vehicle (10), and the transmitting coil (21-1) includes one or more coils (110), and the one or more coils (110) are configured such that their phases are not fixed. At this time, the SECC module (22) is configured to control the phase of one or more coils (110) and to control the direction of the current of one or more coils (110).

[0051] According to the present invention, one or more coils (110) are configured to be arranged in one or more layers, and are configured to form a series connection between the layers or a parallel connection between the layers in the Z direction in one or more layers arranged. In addition, one or more coils (110)

[0052] It is configured to be arranged in one or more layers, and is configured to form a series connection within the layer or a parallel connection within the layer in the X direction or the Y direction in one or more layers that are arranged. In addition, the SECC module (22) is configured to control the phase of the one or more coils (110) in real time through dynamic phase control. In addition, the one or more coils (110) include an impedance matching network (101), and the impedance matching network (101) is configured to adjust the impedance of the one or more coils (110). In addition, the transmitting coil (21-1) includes one or more single units (100) connected to one or more respective coils (110), and the one or more single units (100) are configured to supply a voltage of 200 V or more and 400 V or less to the one or more coils (110).

[0053] As shown in (a) of Fig. 3, the transmitting coil (21-1) includes each coil (110), and it can be confirmed that the phases of A, B, and C are fixed to each coil (110) in the existing three-phase coil of Fig. 3 (a). That is, the coils (110) are arranged with the phases of A, B, and C fixed, and each coil (110) can perform an operation according to the fixed phase when generating a magnetic field.

[0054] As illustrated, in the existing three-phase coil (110) of FIG. 3 (a), the phase of each coil is fixed. Accordingly, there is a problem that it is difficult to implement serial operation by physically connecting the same phases, such as A to B, B to B, etc. For example, since A, B, and C are fixed in one layer and the same A, B, and C phases are repeated in other layers, there is a problem that power transmission efficiency may be reduced or interference may occur at locations where the phases overlap. In addition, since the phases are fixed, there is a problem that it is impossible to dynamically adjust the phases between the stacked layers to configure an optimal power transmission path. Therefore, even if multiple layers are stacked, the coils (110) of each layer do not operate independently, and there is a problem that interference and efficiency reduction between layers occur due to the fixed phase.

[0055] If the existing three-phase coil (110) of FIG. 3 (a) is stacked in layers so that the phases overlap with the existing three-phase coil (110) of FIG. 3 (a) and connected physically and electrically in series, a voltage increasing effect similar to the effect of our invention can be obtained. For example, if the same A-phase coil is placed on the first and second floors and electrically connected in series, the voltages can be added, which can improve power transmission efficiency. However, the existing coil has fixed A, B, and C phases, so there is a problem that the phases for each layer must be determined in advance during the design stage. In addition, the phases cannot be changed depending on the usage environment or charging situation, so there is a problem that it is difficult to adapt to various conditions. In addition, in order to overlap the same phases, the physical alignment between layers must be very precise, and there is a problem that even a slight positional error can lower the power transmission efficiency or cause magnetic interference. In addition, although existing coils can be connected in series in the Z direction, there is a problem in that it is difficult to implement series / parallel operation in the X or Y direction, and if the same phase cannot be connected in series by layer, there is also a problem in that the magnetic fields may be canceled or interference may occur if the B or C phase is placed directly above the A phase.

[0056] As illustrated in (b) of FIG. 3, the coil (110) of the present invention is not phase-fixed and can be set to A, B, and C as needed through control. Specifically, the SECC module (22) illustrated in FIG. 1b can perform phase control of the coil (110), but the phase control may also be performed by a power control module (not shown) in the wireless charging transmitter (21), or by an independent phase control-only module (not shown), but is not limited thereto. Hereinafter, the phase control of the coil (110) is described as being performed by the SECC module (22), but as described above, the phase control of the coil (110) may also be performed by another entity.

[0057] As illustrated, the coil (110) of the present invention is not phase-fixed and can be set to A, B, and C as needed through control. Through this, the SECC module (22) can obtain a voltage increase effect through series operation by connecting the same phase (A phase, A phase) between the stacked layers. In addition, the SECC module (22) can also increase the current capacity through parallel operation by setting different phases in each layer. In addition, the SECC module (22) can stack multiple layers of coils (110) and then connect the coils (110) between layers in series or parallel. For example, the SECC module (22) can implement high-voltage transmission by stacking layers in the Z direction and connecting the same phases between layers in series.

[0058] In addition, the SECC module (22) can also increase the current capacity by connecting the same phase in the X and Y directions in parallel. Specifically, in the parallel connection, each coil (110) operates at the same voltage, and the current can be distributed to each coil (110), and if the same phase (A phase, B phase, C phase) is connected in parallel, the total current capacity increases, so it can be suitable for a charging environment that requires higher current. For example, if the transmitting coil (21-1) is composed of two layers, the current capacity can be further increased by connecting two coils of the same phase (A phase) in the X direction in the first layer in parallel, and connecting coils of the same phase (A phase) in the second layer in parallel, and performing parallel connection between these two layers.

[0059] According to one embodiment of the present invention, since the phase is not fixed and can be set to A, B, and C as needed through control, there is no need to determine the phase in advance during the initial design, and the effect of adjusting the phase through software according to the usage environment can be provided. In addition, the present invention can provide the effect of connecting the same phases or minimizing interference by adjusting the phase regardless of the alignment state of the coils, and implementing series / parallel driving not only in the Z direction (between layers) but also in the X and Y directions. For example, the current capacity can be increased by parallel connection within the same layer in the X direction, or the voltage can be increased by series connection in the Z direction.

[0060] According to one embodiment of the present invention, the SECC (Supply Equipment Communication Controller) module (22) can control the phase of the transmitting coil (21-1) to increase charging efficiency and adapt to various charging environments. Specifically, the SECC module (22) can collect charging-related data such as the state of charge, the state of charge (SOC) of the battery, the alignment state and distance between the transmitting coil (21-1) and the receiving coil (11-1) through communication with the EVCC (Electric Vehicle Communication Controller) module (12). Based on the collected data, the SECC module (22) can calculate the optimal phase of the transmitting coil (21-1), prevent magnetic interference between the coils (110), and adjust the phase to increase power transmission efficiency.

[0061] According to one embodiment of the present invention, the SECC module (22) can analyze the charging environment in real time and apply a phase synchronization algorithm and a phase dispersion algorithm. For example, in the coils (110) arranged in the Z direction (between layers), the same phase can be set to maximize the voltage increase effect when connected in series, and in the coils in the X and Y directions (within layers), the phases can be dispersed to minimize magnetic interference. That is, when a change in the alignment state or distance between the transmitting coil and the receiving coil occurs during charging, the SECC module (22) can detect this in real time and adjust the phase to restore the magnetic field concentration and minimize power loss.

[0062] According to one embodiment of the present invention, during a phase control process, the SECC module (22) can transmit a command to a single unit (100) to set the phase of the current flowing through each coil (110). Here, the single unit (100) can implement the calculated phase by controlling a switching element such as an IGBT or a MOSFET. Thereafter, the SECC module (22) can continuously monitor the power transmission efficiency and the state of charge through a feedback loop and readjust the phase.

[0063] FIG. 4 is a drawing for explaining an embodiment in which a transmitting coil according to the present invention has a two-layer structure.

[0064] As illustrated, the present invention applies a modified three-phase structure to the transmission coil (21-1, Ground Assembly) of the wireless charging transmitter (21). Accordingly, the SECC module (22) of the present invention can flexibly adjust the series and parallel connections of the transmission coil (21-1). Specifically, in the existing three-phase structure, only one of the series or parallel connection methods of the transmission coil (21-1) had to be selected, but in the present invention, the transmission coil (21-1) is subdivided, and the SECC module (22) can adjust the voltage and current according to the situation. Through this, the SECC module (22) of the present invention can adjust the optimal voltage and current of the transmission coil (21-1) according to the charging environment, and has the advantage of improved flexibility and efficiency compared to the existing three-phase coil structure.

[0065] Fig. 4a illustrates a method of connecting the transmitting coils (21-1) in series to increase the charging voltage. That is, as illustrated in Fig. 4a, the present invention can provide a structure in which the transmitting coils (21-1) of the first and second layers are connected in series with each other, and each layer receives a voltage of 800 V from a power conversion device (22-1). In addition, according to the embodiment of Fig. 4a, voltage can be accumulated for each layer through the serial connection, so if the first layer is 800 V and the second layer is 800 V, a voltage of 1600 V can be generated overall. Therefore, the present invention has an effect that can be applied even to a charging system that requires high voltage.

[0066] As illustrated in Fig. 4a, in a series connection, the current passing through each transmitting coil (21-1) remains constant, enabling efficient power supply by increasing the voltage without increasing the overall current. Furthermore, when the charging voltage of an electric vehicle battery is high, utilizing a series connection method enables high-voltage charging, thereby improving charging efficiency. Furthermore, by optimizing the specifications of the power semiconductor, the advantages of this method include reducing heat generation and enhancing the stability of the charging system.

[0067] Fig. 4b is a drawing for explaining a method of connecting the transmitting coils (21-1) in parallel to increase the charging current. That is, it shows a structure in which a voltage of 400 V is individually supplied to each layer, and the transmitting coils (21-1) are connected in parallel to increase the current. Drawing (a) of Fig. 4b shows a single-layer coil structure (A1, A2, B1, B2, C1, C2), and drawing (b) of Fig. 4b shows a two-layer coil structure (A3, A4, B3, B4, C3, C4). Each layer receives 400 V power from a power conversion device (22-1), and the structure shows that the transmitting coils (21-1) are connected in parallel with each other by making a parallel connection between layers, thereby increasing the overall amount of current.

[0068] As illustrated in FIG. 4b, the present invention can also provide a parallel connection in a two-layer coil structure. In the parallel connection, each layer is individually supplied with the same voltage (400 V), so there is an advantage that the voltage does not change. In addition, the transmitting coil (21-1) according to the present invention has an advantage that fast charging is possible because the current amount increases through the parallel connection. For example, when the transmitting coils (21-1) are connected in parallel, the currents of each coil are added, so the total current amount increases, and this allows more power to be supplied, so that the charging time can be shortened. In addition, the transmitting coil (21-1) according to the present invention can increase the current by utilizing the parallel connection while maintaining a low voltage of 400 V, so that efficient charging is possible even in a low-voltage environment.

[0069] Unlike the existing three-phase structure, the present invention is designed to freely select between series and parallel connections depending on the charging environment by utilizing a modified three-phase structure. While the existing three-phase structure had to use only fixed series or parallel methods, the present invention enables various voltage and current adjustments by subdividing the transmitting coil (21-1). That is, the transmitting coil (21-1) according to the present invention can select a series (high voltage) or parallel (high current) method depending on the charging environment. Specifically, when the voltage of the electric vehicle battery is high, high voltage charging is possible using a series connection, and high current charging is possible using a parallel connection to increase the charging speed. In addition, the transmitting coil (21-1) according to the present invention increases charging efficiency because it allows free voltage and current adjustment compared to the existing three-phase structure.

[0070] Previously, only a fixed method (fixed series or parallel) could be used, but the transmitter coil (21-1) according to the present invention can select the optimal setting according to the charging environment through a modified three-phase structure. In addition, the transmitter coil (21-1) according to the present invention provides a cost-saving effect by optimizing the power semiconductor and system. Since the voltage / current can be adjusted as needed, there is no need to use unnecessary high-spec components, and the durability of the system can be increased and heat generation can be reduced, enabling stable charging. In addition, the transmitter coil (21-1) according to the present invention can be applied to various electric vehicle charging systems because it is capable of both high-voltage charging and high-current charging. In particular, the transmitter coil (21-1) according to the present invention can be flexibly applied in various environments such as high-speed charging stations and home chargers.

[0071] FIG. 5 is a drawing for explaining an embodiment in which a transmitting coil according to the present invention has a three-layer structure.

[0072] FIG. 5A is a drawing for explaining a method of connecting the transmitting coils (21-1) in series to increase the charging voltage in a three-layer structure. That is, the transmitting coils (21-1) of the first, second, and third layers are each supplied with 800 V voltage, and the structure in which the overall voltage increases through the series connection between layers is shown. Drawing (a) of FIG. 5A shows a one-layer coil structure (A1, A2, A3, A4, A5, A6), drawing (b) shows a two-layer coil structure (B1, B2, B3, B4, B5, B6), and drawing (c) shows a three-layer coil structure (C1, C2, C3, C4, C5, C6). Each layer is supplied with 800 V power, and the transmitting coils (21-1) are electrically connected through the series connection between layers, showing a structure in which the final voltage increases.

[0073] As illustrated in Fig. 5a, the present invention can accumulate voltage by layer through the series connection of the transmitting coils (21-1). For example, if the first layer is 800 V, the second layer is 800 V, and the third layer is 800 V through the series connection of the transmitting coils (21-1), the present invention can ultimately form a voltage of 2400 V. Therefore, the present invention can apply the series connection in a charging system that requires a high voltage of the transmitting coil (21-1). That is, the structure of Fig. 5a shows an application example of a modified three-phase structure designed to enable optimized charging in a high-voltage environment by increasing the voltage even in the third layer through the series connection.

[0074] FIG. 5b shows a method of connecting the transmitting coils (21-1) in parallel to increase the charging current in a three-layer structure. That is, the transmitting coils (21-1) according to the present invention are individually supplied with a voltage of 400 V in each layer, and a structure in which the transmitting coils (21-1) are connected in parallel to increase the current can be represented. Drawing (a) of FIG. 5b shows a one-layer coil structure (A1, A2, A3, A4, A5, A6), drawing (b) shows a two-layer coil structure (B1, B2, B3, B4, B5, B6), and drawing (c) shows a three-layer coil structure (C1, C2, C3, C4, C5, C6). Each layer is individually supplied with a voltage of 400 V, and a structure in which the total current increases through parallel connection between layers is represented.

[0075] As illustrated in FIG. 5b, the present invention supplies the same voltage (400 V) to each layer individually through the parallel connection of the transmitting coils (21-1), so that the voltage does not change when connected in parallel. In addition, the transmitting coils (21-1) of the present invention enable fast charging because the amount of current increases through the parallel connection. For example, when the transmitting coils (21-1) are connected in parallel, the currents of each transmitting coil (21-1) are added, increasing the total amount of current, thereby enabling more power to be supplied, which can shorten the charging time. In addition, the transmitting coils (21-1) of the present invention can increase the current by utilizing the parallel connection while maintaining a low voltage of 400 V, so that efficient charging is possible even in a low-voltage environment. That is, the structure of FIG. 5b represents an embodiment of a modified three-phase structure designed to enable efficient charging in a low-voltage environment by increasing the current while maintaining the voltage in three layers through the parallel connection.

[0076] Unlike the existing three-phase structure, the present invention utilizes a modified three-phase structure, allowing for free selection of series and parallel connections even in a three-layer structure. While the existing three-phase structure required only fixed series or parallel connections, the present invention allows for various voltage and current adjustments by segmenting the transmitter coil (21-1). That is, the present invention allows selection of a series (high voltage) or parallel (high current) method depending on the charging environment even in a three-layer structure. Thus, when the electric vehicle battery voltage is high, high voltage charging is possible using a series connection, and when the charging speed is high, high current charging is possible using a parallel connection. In addition, the transmitter coil (21-1) of the present invention allows for free voltage and current adjustment compared to the existing three-phase structure, thereby increasing charging efficiency. While the existing structure could only use a fixed method (fixed series or parallel), the transmitter coil (21-1) of the present invention allows for selection of optimal settings depending on the charging environment through the modified three-phase structure. Furthermore, the transmitter coil (21-1) of the present invention is capable of both high-voltage charging and high-current charging, making it applicable to various electric vehicle charging systems.

[0077] The scope of the present invention is not limited to the embodiments described above, but can be implemented in various forms within the scope of the appended claims. It is contemplated that the scope of the claims encompasses various modifications that can be made by anyone skilled in the art without departing from the spirit of the invention as claimed.

[0078] [Explanation of symbols]

[0079] 10: Electric vehicles

[0080] 11: Wireless charging receiver

[0081] 11-1: Receiver coil

[0082] 12: EVCC module

[0083] 13: Display section

[0084] 14: BMS module

[0085] 15: Battery pack

[0086] 16: Temperature sensor

[0087] 20: Charger

[0088] 21: Wireless charging transmitter

[0089] 21-1: Transmitter coil

[0090] 22: SECC module

[0091] 23: UPS module

[0092] 24: Link capacitor

[0093] 100: Single unit

[0094] 101: IMN

[0095] 102: Power switching element

[0096] 110: Coil

Claims

1. In a wireless charger for charging an electric vehicle, A SECC (Supply Equipment Communication Controller) module that communicates with the EVCC (Electric Vehicle Communication Controller) module of the above electric vehicle; and A wireless charging transmitter for charging the electric vehicle based on the above communication is included; The above wireless charging transmitter; A transmitting coil for supplying power to the electric vehicle; The above transmitting coil; A coil having a multilayer structure including a plurality of coil elements; The above SECC module, Configured to selectively connect each layer of the coil having the above multilayer structure or the connection between the plurality of coil elements in a series or parallel manner, Wireless charger for charging electric vehicles.

2. In paragraph 1, The above SECC module, When connecting each layer of the coil having the above multilayer structure or the connection between the plurality of coil elements in a serial manner, Controlling the above-mentioned transmitting coils of each layer to maintain the same current, Wireless charger for charging electric vehicles.

3. In paragraph 1, The above SECC module, When connecting each layer of the coil having the above multilayer structure or the connection between the plurality of coil elements in a parallel manner, Controlling the above-mentioned transmitting coils of each layer to maintain the same voltage, Wireless charger for charging electric vehicles.

4. In paragraph 1, The above wireless charging transmitter; further comprising a power conversion device; The above power conversion device, configured to adjust the voltage and current supplied to the coil having the above multilayer structure, Wireless charger for charging electric vehicles.

5. In a wireless charging system including an electric vehicle and a charger for charging the electric vehicle, The above electric vehicle; and including the above charger; The above charger; SECC module communicating with the EVCC module of the above electric vehicle; and A wireless charging transmitter for charging the electric vehicle based on the above communication is included; The above wireless charging transmitter; A transmitting coil for supplying power to the electric vehicle; The above transmitting coil; A coil having a multilayer structure including a plurality of coil elements; The above SECC module, Configured to selectively connect each layer of the coil having the above multilayer structure or the connection between the plurality of coil elements in a series or parallel manner, A wireless charging system comprising an electric vehicle and a charger for charging the electric vehicle.

6. In paragraph 5, The above SECC module, When connecting each layer of the coil having the above multilayer structure or the connection between the plurality of coil elements in a serial manner, Controlling the above-mentioned transmitting coils of each layer to maintain the same current, A wireless charging system comprising an electric vehicle and a charger for charging the electric vehicle.

7. In paragraph 5, The above SECC module, When connecting each layer of the coil having the above multilayer structure or the connection between the plurality of coil elements in a parallel manner, Controlling the above-mentioned transmitting coils of each layer to maintain the same voltage, A wireless charging system comprising an electric vehicle and a charger for charging the electric vehicle.

8. In paragraph 5, The above wireless charging transmitter; further comprising a power conversion device; The above power conversion device, configured to adjust the voltage and current supplied to the coil having the above multilayer structure, A wireless charging system comprising an electric vehicle and a charger for charging the electric vehicle.

9. In the structure of a transmitting coil of a wireless charger for charging an electric vehicle, one or more single units; and A coil having a multilayer structure including a plurality of coil elements connected to each of the one or more single units; A coil having a multilayer structure including the above plurality of coil elements; Configured to selectively connect each layer of the coil having the above multilayer structure or the connection between the plurality of coil elements in a series or parallel manner, Transmitting coil structure of a wireless charger for charging electric vehicles.

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