Coil assembly, foreign matter detection system, wireless charging system and vehicle

Abstract

The invention discloses a coil assembly, a foreign matter detection system, a wireless charging system and a vehicle. The coil assembly includes: a first detection coil; the first detection coil and the second detection coil are arranged at an interval; and the first detection coil and the second detection coil can be coupled through the magnetic conductive part, so that the energy of the first detection coil is transmitted to the second detection coil. According to the coil assembly, the first detection coil can transmit energy to the second detection coil through the magnetic conductive part, the first detection coil and the second detection coil do not need to be powered separately, and the complexity of the coil assembly is reduced.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, and more specifically, to a coil assembly, a foreign object detection system, a wireless charging system, and a vehicle. Background Technology

[0002] Wireless power transfer (WPT) technology utilizes media such as magnetic fields, lasers, and microwaves as energy carriers to achieve energy transfer between the transmitter and receiver in a non-physical contact manner. It boasts advantages such as safety, reliability, and flexibility, and has been widely applied in fields such as electric vehicles and consumer electronics. Among these, magnetically-coupled resonant wireless power transfer (MCR-WPT), based on the principle of electromagnetic induction, integrates compensation networks at both the transmitter and receiver to ensure that the resonant frequency of the circuit matches the power supply's driving frequency, achieving high-efficiency energy exchange over short to medium distances. However, when foreign objects, especially metallic objects, are present between the transmitter and receiver coils, the high-frequency magnetic field can induce eddy currents within the metallic object, causing its surface temperature to gradually rise, posing a risk of burns and fires.

[0003] Related technologies employ auxiliary coil detection methods, where an auxiliary coil or coil group is mounted on the surface of the wireless transmitting or receiving coil. A corresponding detection circuit then monitors changes in system parameters to determine the presence of foreign objects. However, existing coil assemblies involve a large number of detection coils; for wireless charging of electric vehicles, this number can reach hundreds. Each detection coil requires its own power supply, resulting in a complex coil assembly structure. Therefore, reducing the complexity of coil assemblies is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] This application provides a coil assembly, a foreign object detection system, a wireless charging system, and a vehicle to reduce the complexity of the coil assembly.

[0005] In a first aspect, embodiments of this application provide a coil assembly including: a first detection coil; a second detection coil, the first detection coil and the second detection coil being spaced apart; and a magnetic conductor, the first detection coil and the second detection coil being coupled through the magnetic conductor to transfer energy from the first detection coil to the second detection coil.

[0006] According to the coil assembly of the present application embodiment, the first detection coil and the second detection coil are spaced apart and can be coupled through a magnetic conductor. Thus, the first detection coil can transfer energy to the second detection coil through the magnetic conductor, eliminating the need to supply power to the first and second detection coils separately, reducing the complexity of the coil assembly, and not affecting the foreign object detection effect of the coil assembly.

[0007] In one possible implementation, there are multiple second detection coils, which are spaced apart. Each second detection coil can be coupled to the first detection coil through a magnetic conductor to transfer the energy of the first detection coil to each second detection coil.

[0008] In one possible implementation, there are multiple second detection coils, which are spaced apart. Some of the second detection coils are coupled to the first detection coil through a magnetic conductor, and the remaining second detection coils are coupled to at least one adjacent second detection coil through a magnetic conductor, so that the energy of the first detection coil is transferred to each second detection coil.

[0009] In one possible implementation, the first detection coil and the second detection coil extend along a first direction and are spaced apart.

[0010] In one possible implementation, the first detection coil includes two sub-coils connected in series, and / or the second detection coil includes two sub-coils connected in series.

[0011] In one possible implementation, the two sub-coils of the first detection coil have opposite polarities, and / or, the two sub-coils of the second detection coil have opposite polarities.

[0012] In one possible implementation, the first detection coil is rectangular, circular, elliptical, or DD-shaped; and / or, the second detection coil is rectangular, circular, elliptical, or DD-shaped.

[0013] In one possible implementation, the material of the magnetic conductor includes one or more combinations of ferrite, iron-nickel alloy, iron-silicon alloy, nanocrystalline alloy, and other soft magnetic materials.

[0014] In one possible implementation, the coil assembly further includes a plurality of sampling resistors, which are respectively connected to the first detection coil and the second detection coil.

[0015] In one possible implementation, the coil assembly further includes multiple capacitors, each of which is connected to a first detection coil and a second detection coil respectively.

[0016] Secondly, embodiments of this application provide a foreign object detection system, which includes the aforementioned coil assembly.

[0017] In one possible implementation, the foreign object detection system further includes a drive circuit connected to the first detection coil.

[0018] In one possible implementation, the foreign object detection system further includes a sampling circuit, which is connected to the first detection coil and connected to each of the second detection coils in a one-to-one correspondence, for detecting electrical parameters in the first detection coil and each of the second detection coils.

[0019] In one possible implementation, the coil assembly further includes a plurality of sampling resistors, which are respectively connected to the first detection coil and the second detection coil, and the sampling circuit is connected to each sampling resistor.

[0020] In one possible implementation, the presence of a foreign object is determined when the change in the electrical parameters of the first detection coil and / or at least one second detection coil exceeds a set value.

[0021] In one possible implementation, multiple coil assemblies are provided, with the multiple coil assemblies spaced apart.

[0022] Thirdly, embodiments of this application provide a wireless charging system, which includes the aforementioned foreign object detection system.

[0023] In one possible implementation, the wireless charging system further includes a wireless transmitting coil, and a foreign object detection system is arranged on the wireless transmitting coil, adapted to detect foreign objects between the wireless transmitting coil and the wireless receiving coil.

[0024] In one possible implementation, the wireless charging system further includes a transmitter controller connected to a foreign object detection system and a wireless transmitting coil.

[0025] In one possible implementation, the foreign object detection system includes a sampling circuit connected to a first detection coil and connected to each of the second detection coils in a one-to-one correspondence. The transmitter controller is connected to the sampling circuit and the wireless transmission coil.

[0026] In one possible implementation, the foreign object detection system includes a drive circuit connected to a first detection coil, and a transmitter controller connected to the drive circuit and a wireless transmission coil.

[0027] In one possible implementation, the wireless charging system further includes a wireless receiving coil, and a foreign object detection system is arranged on the wireless receiving coil, adapted to detect foreign objects between the wireless receiving coil and the wireless transmitting coil.

[0028] In one possible implementation, the wireless charging system further includes a receiver controller connected to a foreign object detection system and a wireless receiving coil.

[0029] In one possible implementation, the foreign object detection system includes a sampling circuit connected to a first detection coil and connected to each of the second detection coils in a one-to-one correspondence. The receiver controller is connected to the sampling circuit and the wireless receiving coil.

[0030] In one possible implementation, the foreign object detection system includes a drive circuit connected to a first detection coil, and a receiver controller connected to the drive circuit and a wireless receiving coil.

[0031] Fourthly, embodiments of this application provide a vehicle that includes the aforementioned coil assembly, or the aforementioned foreign object detection system, or the aforementioned wireless charging system.

[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0033] Figure 1 Schematic diagram of the coil assembly provided in the embodiments of this application Figure 1 ;

[0034] Figure 2 Schematic diagram of the coil assembly provided in the embodiments of this application Figure 2 ;

[0035] Figure 3 A schematic diagram of the equivalent circuit of the coil assembly provided in the embodiments of this application;

[0036] Figure 4 This is a schematic diagram of the foreign object detection system provided in the embodiments of this application;

[0037] Figure 5 (a) Schematic diagram of the positional distribution of the coil assembly provided in the embodiments of this application Figure 1 ;

[0038] Figure 5 (b) Schematic diagram of the positional distribution of the coil assembly provided in the embodiments of this application Figure 2 ;

[0039] Figure 6 A schematic diagram of the structure of a wireless charging system for a vehicle provided in an embodiment of this application;

[0040] Figure 7 This is a schematic diagram illustrating the workflow of a wireless charging system for a vehicle provided in an embodiment of this application.

[0041] Figure label:

[0042] The coil assembly 10 includes a first detection coil 11, a second detection coil 12, a magnetic conductor 13, a sub-coil 14, a drive circuit 20, a wireless transmitting coil 30, a transmitting end controller 40, a wireless receiving coil 50, and a receiving end controller 60. Detailed Implementation

[0043] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0044] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] The following is combined with Figures 1-7 The coil assembly, foreign object detection system, wireless charging system, and vehicle according to embodiments of the present invention are described in detail.

[0046] In the embodiments of this application, reference is made to Figure 1 and Figure 2 As shown, the coil assembly 10 includes: a first detection coil 11; a second detection coil 12, the first detection coil 11 and the second detection coil 12 being spaced apart; and a magnetic conductor 13, through which the first detection coil 11 and the second detection coil 12 can be coupled to transfer energy from the first detection coil 11 to the second detection coil 12. The coil assembly 10 is suitable for placement between the wireless transmitting coil 30 and the wireless receiving coil 50. Energy is transferred wirelessly between the wireless transmitting coil 30 and the wireless receiving coil 50 via magnetic field coupling, and a matching electromagnetic coupling mechanism enables wireless energy transmission. When a foreign object enters the high-frequency alternating magnetic field within a certain spatial range between the wireless transmitting coil 30 and the wireless receiving coil 50, the coil assembly 10 placed between the wireless transmitting coil 30 and the wireless receiving coil 50 can sense the change in the magnetic field caused by the foreign object, thereby enabling the detection of the foreign object.

[0047] According to the coil assembly 10 of the present application embodiment, the first detection coil 11 and the second detection coil 12 are spaced apart and can be coupled through the magnetic conductor 13. The magnetic conductor 13 can enhance the mutual inductance between the first detection coil 11 and the second detection coil 12, so that the first detection coil 11 can transfer energy to the second detection coil 12 through the magnetic conductor 13. There is no need to supply power to the first detection coil 11 and the second detection coil 12 separately, which reduces the complexity of the coil assembly 10 and does not affect the foreign object detection effect of the coil assembly 10.

[0048] In some embodiments of this application, there are multiple second detection coils 12, spaced apart from each other. Each second detection coil 12 is coupled to the first detection coil 11 via a magnetic conductor 13, so that the energy of the first detection coil 11 is transferred to each second detection coil 12. The multiple second detection coils 12 can be coupled to the first detection coil 11 respectively via the magnetic conductor 13. Each magnetic conductor 13 can evenly transfer the energy received by the first detection coil 11 to each second detection coil 12, thereby powering all the second detection coils 12. The coil assembly 10 can reduce the complexity and cost of the coil assembly 10 while ensuring the accuracy of foreign object detection, and improve the flexibility of the coil assembly 10. Simultaneously, the above-described distributed layout of the first detection coil 11 and the multiple second detection coils 12 can cover a larger detection area, while reducing the load on a single detection coil and improving the detection stability of the coil assembly.

[0049] In some embodiments of this application, there are multiple second detection coils 12, which are spaced apart. Some of the second detection coils 12 are coupled to the first detection coil 11 through a magnetic conductor 13, and the remaining second detection coils 12 are coupled to at least one adjacent second detection coil 11 through a magnetic conductor 13, so that the energy of the first detection coil 11 is transferred to each second detection coil 12. Some of the second detection coils 12 are coupled to the first detection coil 11 via magnetic conductors 13, and the remaining second detection coils 12 are coupled to adjacent second detection coils 11 via magnetic conductors 13. Each second detection coil 12 is coupled to at least one adjacent second detection coil 12 and / or the first detection coil 11 via a corresponding magnetic conductor 13. This ensures that when the first detection coil 11 cannot be coupled to all the second detection coils 12 via magnetic conductors 13, each magnetic conductor 13 can evenly transfer the energy received by the first detection coil 11 to each second detection coil 12, thereby powering all the second detection coils 12. The coil assembly 10 can reduce the complexity and cost of the coil assembly 10 while ensuring the accuracy of foreign object detection, and improve the flexibility of the coil assembly 10. At the same time, the above-mentioned distributed layout of the first detection coil 11 and multiple second detection coils 12 can further cover a larger detection area, while reducing the load on a single detection coil and improving the detection stability of the coil assembly.

[0050] In some embodiments of this application, the first detection coil 11 and the second detection coil 12 extend along a first direction and are spaced apart. The first detection coil 11 and one or more second detection coils 12 constitute a planar coil array extending along the first direction.

[0051] In some embodiments of this application, the magnetic conductor 13 is disposed on one side of the first detection coil 11 and the second detection coil 12 along a second direction; wherein the first direction and the second direction are arranged at an angle. Optionally, the magnetic conductor 13 is glued or fixedly connected to the first detection coil 11 and the second detection coil 12 by other fixing methods. The magnetic conductor 13 is disposed at the bottom or above the first detection coil 11 and the second detection coil 12 to enhance their coupling, and / or, the magnetic conductor 13 is disposed at the bottom or above two adjacent second detection coils 12 to enhance their coupling, thereby realizing coplanar power transmission and reducing the cost of wire connections between the first detection coil 11 and the second detection coil 12 and between adjacent second detection coils 12.

[0052] In some embodiments of this application, a plurality of second detection coils 12 are distributed in an M×N array with the first detection coil 11, where M is an integer greater than or equal to 2 and N is an integer greater than or equal to 2; or, M is an integer greater than or equal to 3 and N is an integer greater than or equal to 1. The specific size of the coil array can be expanded or reduced according to the actual detection range and requirements, and the arrangement of the magnetic conductive elements 13 corresponds to the coil array.

[0053] In some embodiments of this application, when M and N are equal and odd, the first detection coil 11 is positioned in the middle of the M×N coil array. Positioning the first detection coil 11 in the middle of the M×N coil array facilitates the uniform transfer of energy received by the first detection coil 11 to each second detection coil 12 through each magnetic conductor 13, thereby powering the entire coil array.

[0054] In some embodiments of this application, reference is made to Figure 2 As shown, the first detection coil 11 includes two sub-coils 14 connected in series, and / or the second detection coil 12 includes two sub-coils 14 connected in series. At least one of the first detection coil 11 and the second detection coil 12 may include two sub-coils 14 connected in series to increase the magnetic field strength at the location of the sub-coils, thereby improving the accuracy of foreign object detection.

[0055] In some embodiments of this application, the two sub-coils 14 of the first detection coil 11 have opposite polarities, and / or, the two sub-coils 14 of the second detection coil 12 have opposite polarities. For the first detection coil 11 and / or the second detection coil 12, the magnetic fields of the two series-connected sub-coils 14 with opposite polarities cancel each other out, which can effectively reduce the coupling between the wireless transmitting coil 30 and the wireless receiving coil 50, and reduce the influence of the coil assembly 10 on the wireless power transmission magnetic field of the wireless transmitting coil 30 and the wireless receiving coil 50.

[0056] In some embodiments of this application, the first detection coil 11 is rectangular, circular, elliptical, or DD-type; and / or, the second detection coil 12 is rectangular, circular, elliptical, or DD-type. The first detection coil 11 and the second detection coil 12 can have the same shape or different shapes; multiple second detection coils 12 can have the same shape or different shapes. Specifically, according to relevant standards for electric vehicle WPT systems, in a 3.3kW WPT system, the wireless transmitting coil 30 and the wireless receiving coil 50 typically use non-polarized square coils. The magnetic fields generated by the DD-type coil and the non-polarized square coil are perpendicular to each other, resulting in a very low coupling coefficient. Using the DD-type coil as the first detection coil 11 and / or the second detection coil 12 can effectively reduce the coupling between the wireless transmitting coil 30 and the wireless receiving coil 50, ensuring efficient power transmission.

[0057] In some embodiments of this application, the material of the magnetic conductor 13 includes one or more combinations of ferrite, iron-nickel alloy, iron-silicon alloy, nanocrystalline alloy, and other soft magnetic materials. The function of the magnetic conductor 13 is to uniformly transfer the energy received by the first detection coil 11 to all the second detection coils 12, thereby powering all the second detection coils 12. The magnetic conductor 13 has high permeability and can be used in high-frequency environments, improving magnetic circuit coupling efficiency while reducing energy loss.

[0058] In some embodiments of this application, the coil assembly 10 further includes a plurality of sampling resistors, which are respectively connected to the first detection coil 11 and the second detection coil 12 in a one-to-one correspondence. The first detection coil 11 and each of the second detection coils 12 are connected to the corresponding sampling resistor. The sampling resistor is used to convert the current signal in the detection circuit into a voltage signal and transmit it to the sampling circuit to determine whether there is a foreign object, especially a metallic foreign object, thereby providing data support for foreign object detection.

[0059] In some embodiments of this application, the coil assembly 10 further includes multiple capacitors, which are respectively connected to the first detection coil 11 and the second detection coil 12. Both the first detection coil 11 and each of the second detection coils 12 are connected to capacitors. By tuning the capacitors, the resonant frequencies of the first detection coil 11 and the second detection coil 12 are optimized, improving energy transmission efficiency and thus enhancing the detection accuracy of the first detection coil 11 and the second detection coil 12.

[0060] In some embodiments of this application, reference is made to Figure 1 and Figure 2 As shown, the coil assembly 10 adopts a 3×3 coil array, and four magnetic conductors 13 are arranged at the bottom of the first detection coil 11 and the four adjacent second detection coils 12. Four magnetic conductors 13 are also arranged at the bottom of the four second detection coils 12 adjacent to the first detection coil 11 and the remaining four adjacent second detection coils 12. The first detection coil 11 and all eight second detection coils 12 can be coupled through the magnetic conductors 13, so that the energy received by the first detection coil 11 can be evenly transferred to each second detection coil 12 through each magnetic conductor 13, thereby powering the entire 3×3 coil array and enabling the array-type coil assembly 10 to work normally.

[0061] Reference Figure 3 As shown, the equivalent circuit of the coil assembly 10 of the 3×3 coil array is explained: AC is the driving power supply, L... s For the self-inductance of the first detection coil 11, r sR is the equivalent series resistance of the first detection coil 11. L1, L2, L3, and L4 are the self-inductances of the four second detection coils 12 adjacent to the first detection coil 11, L5, L6, L7, and L8 are the self-inductances of the remaining four second detection coils 12, and r1, r2, r3, r4, r5, r6, r7, and r8 are the equivalent series resistances of the eight second detection coils 12. s R1, R2, R3, R4, R5, R6, R7, and R8 are the sampling resistors for the first detection coil 11 and the eight second detection coils 12, respectively. M S1 M S2 M S3 M S4 M 15 M 26 M 37 M 48 The mutual inductance is between adjacent first detection coils 11 and second detection coils 12 with the magnetic conductive component 13 laid on the bottom, or between two adjacent second detection coils 12. The cross-coupling between second detection coils 12 without the magnetic conductive component 13 is small and can be ignored. Based on the conductivity and magnetic permeability of foreign objects, especially metallic foreign objects, when a metallic foreign object enters a high-frequency alternating magnetic field, it will cause changes in the aforementioned electrical parameters such as resistance and inductance. The sampling circuit can detect the changing current and voltage signals through the sampling resistor and input them to the corresponding controller for comparison, thereby determining whether there is a metallic foreign object.

[0062] According to a second aspect of this application, the foreign object detection system includes the coil assembly 10 described above.

[0063] According to the foreign object detection system of the present application embodiment, the first detection coil 11 and the second detection coil 12 in the coil assembly 10 can be coupled through the magnetic conductor 13. The magnetic conductor 13 can enhance the mutual inductance between the first detection coil 11 and the second detection coil 12, thereby the first detection coil 11 can transfer energy to the second detection coil 12 through the magnetic conductor 13. There is no need to supply power to the first detection coil 11 and the second detection coil 12 separately, which reduces the complexity of the foreign object detection system and does not affect the foreign object detection effect of the foreign object detection system.

[0064] In some embodiments of this application, the foreign object is a metallic foreign object. When a metallic foreign object enters the high-frequency alternating magnetic field within a certain spatial range between the wireless transmitting coil 30 and the wireless receiving coil 50, it more easily causes a change in the magnetic field of the foreign object detection system, and the electrical parameters of the foreign object detection system change accordingly, thereby enabling the detection of metallic foreign objects. Metallic foreign objects can be divided into non-ferromagnetic metals and ferromagnetic metals. Non-ferromagnetic metals are conductive but have weak magnetic permeability, such as gold and silver; ferromagnetic metals are both conductive and magnetic, such as iron and nickel. Both types of metals, upon entering the high-frequency alternating magnetic field, will affect the electrical characteristics of the coupled first detection coil 11 and second detection coil 12, such as mutual inductance, equivalent series resistance, and equivalent self-inductance, and / or, the electrical characteristics of the coupled second detection coil 12, such as mutual inductance, equivalent resistance, and equivalent inductance.

[0065] In some embodiments of this application, reference is made to Figure 4 As shown, the foreign object detection system also includes a drive circuit 20, which is connected to the first detection coil 11. Existing array-type coil assemblies require a drive circuit to power each detection coil, and the circuit structures between detection coils, between detection coils and sampling circuits, and between drive circuits are complex and costly. In this embodiment, the drive circuit 20 only drives the first detection coil 11. The first detection coil 11 transmits the received energy to each second detection coil 12 through the magnetic conductor 13, thereby driving all second detection coils 12. This reduces the complexity of the drive circuit and decreases the cost of wire connections between the first and second detection coils 11 and adjacent second detection coils 12, as well as the overall cost of the foreign object detection system. Because the first detection coil 11 is connected to an independent drive circuit 20, the foreign object detection system can activate the foreign object detection function at any time.

[0066] In some embodiments of this application, the foreign object detection system further includes a sampling circuit. The sampling circuit is connected to the first detection coil 11 and to each of the second detection coils 12 in a one-to-one correspondence. The sampling circuit is used to detect electrical parameters in the first detection coil 11 and each of the second detection coils 12. The sampling circuit can detect electrical parameters such as current and voltage in the first detection coil 11 and each of the second detection coils 12, and input them to the corresponding controller for comparison to determine whether a metallic foreign object exists in the foreign object detection system.

[0067] In some embodiments of this application, the coil assembly 10 further includes multiple sampling resistors, which are respectively connected to the first detection coil 11 and the second detection coil 12. A sampling circuit is connected to each sampling resistor. When a metallic foreign object enters the high-frequency alternating magnetic field, it will cause changes in the electrical parameters such as the resistance and inductance of the first detection coil 11 and / or the second detection coil 12. The sampling resistors can convert the current signals in the first detection coil 11 and the second detection coil 12 into voltage signals, which are then amplified and filtered by the sampling circuit and input to the corresponding controller for comparison to determine whether a metallic foreign object exists in the foreign object detection system.

[0068] In some embodiments of this application, the presence of a foreign object is determined when the change in the electrical parameters of the first detection coil 11 and / or at least one second detection coil 12 exceeds a set value. By determining whether the change in the electrical parameters of the first detection coil 11 and / or at least one second detection coil 12 exceeds a set value, the accuracy and precision of the foreign object detection system can be improved.

[0069] In some embodiments of this application, reference is made to Figure 5 As shown in (a), the foreign object detection system has a coil assembly 10 located between the wireless transmitting coil 30 and the wireless receiving coil 50. The specific size of the coil assembly 10 can be enlarged or reduced according to the actual detection range and requirements, and the arrangement of the magnetic conductive elements 13 corresponds to the coil array.

[0070] In some embodiments of this application, reference is made to Figure 5 As shown in (b), multiple coil assemblies 10 are provided, and the multiple coil assemblies 10 are arranged at intervals. The multiple coil assemblies 10 can be arranged at different positions between the wireless transmitting coil 30 and the wireless receiving coil 50, such as at the four corners above the wireless transmitting coil 30. The installation positions of the multiple coil assemblies 10 are not fixed and can be adjusted according to actual testing requirements.

[0071] According to a third aspect of this application, the wireless charging system includes the aforementioned foreign object detection system.

[0072] According to the wireless charging system of the present application embodiment, the first detection coil 11 and the second detection coil 12 in the foreign object detection system can be coupled through a magnetic conductor 13. The magnetic conductor 13 can enhance the mutual inductance between the first detection coil 11 and the second detection coil 12, thereby enabling the first detection coil 11 to transfer energy to the second detection coil 12 through the magnetic conductor 13. There is no need to supply power to the first detection coil 11 and the second detection coil 12 separately, which reduces the complexity and cost of the wireless charging system, does not affect the foreign object detection effect of the foreign object detection system, improves the safety of the wireless charging system, and ensures the charging efficiency of the wireless charging system.

[0073] In some embodiments of this application, the wireless charging system further includes a wireless transmitting coil 30, and a foreign object detection system is disposed on the wireless transmitting coil 30, adapted to detect foreign objects between the wireless transmitting coil 30 and the wireless receiving coil 50. By integrating the foreign object detection system with the wireless transmitting coil 30, the risk of foreign objects in the wireless transmitting coil 30 during the charging process can be monitored in real time.

[0074] In some embodiments of this application, the wireless charging system further includes a transmitter controller 40, which is connected to a foreign object detection system and a wireless transmitting coil 30. The transmitter controller 40 controls the wireless transmitting coil 30 based on the detection signal from the foreign object detection system. When a foreign object exists between the wireless transmitting coil 30 and the wireless receiving coil 50, the transmitter controller 40 controls the wireless transmitting coil 30 to stop charging. Simultaneously, the transmitter controller 40 communicates wirelessly with the receiver controller 60, and the receiver controller 60 controls the wireless receiving coil 50 to stop charging. When no foreign object exists between the wireless transmitting coil 30 and the wireless receiving coil 50, the transmitter controller 40 controls the wireless transmitting coil 30 to start charging or continue charging, and the receiver controller 60 controls the wireless receiving coil 50 to start charging or continue charging.

[0075] In some embodiments of this application, the foreign object detection system includes a sampling circuit connected to a first detection coil 11 and correspondingly connected to each of the second detection coils 12. A transmitter controller 40 is connected to the sampling circuit and the wireless transmitter coil 30. The transmitter controller 40 determines whether a foreign object exists in the foreign object detection system based on relevant signals of electrical parameters such as current and voltage detected by the sampling circuit, thereby controlling the wireless transmitter coil 30. Specifically, when the sampling circuit detects a change in the electrical parameters of the first detection coil 11 and / or at least one of the second detection coils 12, the transmitter controller 40 controls the wireless transmitter coil 30 to stop charging, and the wireless charging system immediately ends charging. When the sampling circuit detects no change in the electrical parameters of the first detection coil 11 and / or at least one of the second detection coils 12, the transmitter controller 40 controls the wireless transmitter coil 30 to start charging or continue charging.

[0076] In some embodiments of this application, the foreign object detection system includes a drive circuit 20 connected to a first detection coil 11, and a transmitter controller 40 connected to the drive circuit 20 and the wireless transmitting coil 30. The drive circuit 20 is connected to the transmitter controller 40, which can control the drive circuit 20 to start working for foreign object detection after the wireless transmitting coil 30 is ready to charge. The transmitter controller 40 can also control the drive circuit 20 to start working for foreign object detection at any time according to actual detection needs. Because the foreign object detection system has an independent drive circuit 20, it does not rely on the wireless transmitting coil 30 and the wireless receiving coil 50, thus achieving complete decoupling of the wireless charging system.

[0077] In some embodiments of this application, the wireless charging system further includes a wireless receiving coil 50, and a foreign object detection system is disposed on the wireless receiving coil 50, adapted to detect foreign objects between the wireless receiving coil 50 and the wireless transmitting coil 30. By integrating the foreign object detection system with the wireless receiving coil 50, the risk of foreign objects in the wireless receiving coil 50 during the charging process can be monitored in real time.

[0078] In some embodiments of this application, the wireless charging system further includes a receiver controller 60, which is connected to a foreign object detection system and a wireless receiving coil 50. The receiver controller 60 controls the wireless receiving coil 50 based on the detection signal from the foreign object detection system. When a foreign object exists between the wireless transmitting coil 30 and the wireless receiving coil 50, the receiver controller 60 controls the wireless receiving coil 50 to stop charging. Simultaneously, the receiver controller 60 wirelessly communicates with the transmitter controller 40, and the transmitter controller 40 controls the wireless transmitting coil 30 to stop charging. When no foreign object exists between the wireless transmitting coil 30 and the wireless receiving coil 50, the receiver controller 60 controls the wireless receiving coil 50 to start charging or continue charging, and the transmitter controller 40 controls the wireless transmitting coil 30 to start charging or continue charging.

[0079] In some embodiments of this application, the foreign object detection system includes a sampling circuit connected to a first detection coil 11 and correspondingly connected to each of the second detection coils 12. A receiver controller 60 is connected to the sampling circuit and the wireless receiving coil 50. The receiver controller 60 determines whether a foreign object exists in the foreign object detection system based on relevant signals of electrical parameters such as current and voltage detected by the sampling circuit, thereby controlling the wireless receiving coil 50. Simultaneously, the receiver controller 60 wirelessly communicates with the transmitter controller 40, which controls the wireless transmitting coil 30. Specifically, when the sampling circuit detects a change in the electrical parameters of the first detection coil 11 and / or at least one second detection coil 12, the receiver controller 60 controls the wireless receiving coil 50 to stop charging, and the wireless charging system immediately ends charging. When the sampling circuit detects no change in the electrical parameters of the first detection coil 11 and / or at least one second detection coil 12, the receiver controller 60 controls the wireless receiving coil 50 to start charging or continue charging.

[0080] In some embodiments of this application, the foreign object detection system includes a driving circuit 20 connected to a first detection coil 11, and a receiver controller 60 connected to the driving circuit 20 and the wireless receiving coil 50. The driving circuit 20 is connected to the receiver controller 60, which can control the driving circuit 20 to start working for foreign object detection after the wireless receiving coil 50 is ready to charge. The receiver controller 60 can also control the driving circuit 20 to start working for foreign object detection at any time according to actual detection needs. Because the foreign object detection system has an independent driving circuit 20, it does not rely on the wireless transmitting coil 30 and the wireless receiving coil 50, thus achieving complete decoupling of the wireless charging system.

[0081] In some embodiments of this application, the wireless charging system further includes a voltage source and a first converter. The input terminal of the first converter is connected to the voltage source, the output terminal of the first converter is connected to the wireless transmitting coil 30, and the control terminal of the first converter is connected to the transmitter controller 40. The transmitter device of the wireless charging system includes a voltage source, a first converter, a wireless transmitting coil 30, and a transmitter controller 40. The transmitter controller 40 can wirelessly communicate with the receiver controller 60. Optionally, the first converter is an inverter.

[0082] In some embodiments of this application, the wireless charging system further includes a second converter and a receiving load. The input terminal of the second converter is connected to the wireless receiving coil 50, the output terminal of the second converter is connected to the receiving load, and the control terminal of the second converter is connected to the transmitting controller 40. The receiving device of the wireless charging system includes the second converter, the wireless receiving coil 50, the receiving controller 60, and the receiving load. The receiving controller 60 can wirelessly communicate with the transmitting controller 40. Optionally, the second converter is a rectifier, and the receiving load is an electronic device or a vehicle battery.

[0083] According to a fourth aspect of this application, the vehicle includes the coil assembly 10 described above, or the foreign object detection system described above, or the wireless charging system described above. Optionally, the coil assembly 10 may be disposed in the vehicle's wireless charging transmitter device, which is used to wirelessly charge a mobile phone or other terminal; the coil assembly 10 may also be disposed in the vehicle's wireless charging receiver device, which is used to receive wireless energy from an external wireless charging transmitter device to charge the vehicle battery.

[0084] According to the vehicle of the present application embodiment, the first detection coil 11 and the second detection coil 12 in the coil assembly 10 can be coupled through the magnetic conductor 13. The magnetic conductor 13 can enhance the mutual inductance between the first detection coil 11 and the second detection coil 12, thereby the first detection coil 11 can transfer energy to the second detection coil 12 through the magnetic conductor 13. There is no need to supply power to the first detection coil 11 and the second detection coil 12 separately, which reduces the complexity and cost of the coil assembly 10, and does not affect the foreign object detection effect of the coil assembly 10, improves the safety of the vehicle in the wireless charging process, and at the same time ensures the wireless charging efficiency of the vehicle.

[0085] In some embodiments of this application, reference is made to Figure 6As shown, coil assembly 10 is disposed in the vehicle's wireless charging receiver device, and the transmitter device of the wireless charging system is a ground-based device. The receiver controller 60 in the vehicle's wireless charging receiver device and the transmitter controller 40 in the ground-based device can communicate wirelessly. The first converter of the ground-based device is connected to a voltage source (such as the power grid). After voltage transformation by the inverter, energy is transmitted to the wireless transmitting coil 30. The wireless transmitting coil 30 emits an electromagnetic field and generates a high-frequency alternating magnetic field within a certain spatial range around it. The second converter of the vehicle's wireless charging receiver device connects the wireless receiving coil 50 and the vehicle battery. The wireless receiving coil 50 receives the magnetic induction signal from the wireless transmitting coil 30, and after voltage adjustment by the second converter, it is transmitted to the vehicle battery to realize the vehicle's wireless charging function. Optionally, the controller of the vehicle's wireless charging receiver is also connected to the battery management system (BMS) and the human-machine interface (HMI). The BMS is used to manage the wireless charging, battery power, and battery temperature of the vehicle battery, while the HMI is used to interact with and display information such as the start of wireless charging, the progress of wireless charging, and the foreign object detection results of the foreign object detection system.

[0086] In some embodiments of this application, reference is made to Figure 7 As shown, the ground-side equipment is the ground terminal of the charging parking space. The following describes the workflow of the vehicle's wireless charging system:

[0087] In step S101, the vehicle obtains the ground IP address by connecting to WIFI and establishes a TCP network communication connection with the transmitter controller 40 at the ground end of the charging parking space.

[0088] In step S102, the wireless transmitting coil 30 at the ground end of the charging parking space begins to generate a magnetic field signal. After the vehicle goes through the parking and alignment process, the vehicle's wireless receiving coil 50 enters the magnetic field.

[0089] In step S103, after the vehicle is parked, the drive circuit 20 starts to drive the first detection coil 11 to supply power to the first detection coil 11. The first detection coil 11 indirectly drives all the second detection coils 12. The first detection coil 11 supplies power to the second detection coils 12 through the magnetic conductor 13, so that the matrix coil assembly 10 can work normally.

[0090] In step S104, the sampling circuit in the foreign object detection system samples the magnetic field electrical parameters above the first detection coil 11 and the second detection coil 12, and determines whether the magnetic field electrical parameters of the first detection coil 11 and / or at least one second detection coil 12 have changed. If they have changed, the charging process ends directly; if they have not changed, step 105 is executed.

[0091] In step S105, the sampling circuit transmits electrical parameter-related signals to the transmitter controller 40. Upon receiving a signal indicating the absence of foreign objects at the current moment, the transmitter controller 40 either begins charging or continues charging. Once the vehicle battery is fully charged, the foreign object detection system can either terminate the detection or continue the process.

[0092] It should be noted that the aforementioned foreign object detection system performs foreign object detection after the vehicle enters the parking space and is parked and aligned. The foreign object detection system can also be set to start working at any time as needed.

[0093] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0095] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A coil assembly, characterized in that, include: First detection coil; The second detection coil is provided at an interval from the first detection coil; A magnetic conductive element is provided, through which the first detection coil and the second detection coil can be coupled to transfer the energy of the first detection coil to the second detection coil.

2. The coil assembly according to claim 1, characterized in that, The number of second detection coils is multiple, and the multiple second detection coils are spaced apart. Each second detection coil can be coupled to the first detection coil through the magnetic conductor to transfer the energy of the first detection coil to each second detection coil.

3. The coil assembly according to claim 1, characterized in that, The number of second detection coils is multiple, and the multiple second detection coils are spaced apart. Some of the second detection coils are coupled to the first detection coil through the magnetic conductor, and the remaining second detection coils are coupled to at least one adjacent second detection coil through the magnetic conductor, so that the energy of the first detection coil is transferred to each second detection coil.

4. The coil assembly according to claim 1, characterized in that, The first detection coil and the second detection coil extend along a first direction and are spaced apart.

5. The coil assembly according to any one of claims 1-4, characterized in that, The first detection coil includes two sub-coils connected in series, and / or the second detection coil includes two sub-coils connected in series.

6. The coil assembly according to claim 5, characterized in that, The two sub-coils of the first detection coil have opposite polarities, and / or the two sub-coils of the second detection coil have opposite polarities.

7. The coil assembly according to any one of claims 1-4, characterized in that, The first detection coil is rectangular, circular, elliptical, or DD-shaped; and / or the second detection coil is rectangular, circular, elliptical, or DD-shaped.

8. The coil assembly according to any one of claims 1-4, characterized in that, The material of the magnetic conductive component includes one or more combinations of ferrite, iron-nickel alloy, iron-silicon alloy, nanocrystalline alloy, and other soft magnetic materials.

9. The coil assembly according to any one of claims 1-4, characterized in that, The coil assembly also includes multiple sampling resistors, which are respectively connected to the first detection coil and the second detection coil.

10. The coil assembly according to any one of claims 1-4, characterized in that, The coil assembly also includes multiple capacitors, which are respectively connected to the first detection coil and the second detection coil.

11. A foreign object detection system, characterized in that, Includes the coil assembly as described in any one of claims 1-10.

12. The foreign object detection system according to claim 11, characterized in that, The foreign object detection system also includes a driving circuit, which is connected to the first detection coil.

13. The foreign object detection system according to claim 11, characterized in that, The foreign object detection system further includes a sampling circuit, which is connected to the first detection coil and also connected to each of the second detection coils in a one-to-one correspondence, for detecting electrical parameters in the first detection coil and each of the second detection coils.

14. The foreign object detection system according to claim 13, characterized in that, The coil assembly also includes a plurality of sampling resistors, which are respectively connected to the first detection coil and the second detection coil in a one-to-one correspondence, and the sampling circuit is connected to each of the sampling resistors.

15. The foreign object detection system according to claim 13 or 14, characterized in that, If the change in the electrical parameters of the first detection coil and / or at least one of the second detection coils exceeds a set value, it is determined that a foreign object is present.

16. The foreign object detection system according to any one of claims 11-14, characterized in that, The coil assembly is provided in multiple ways, and the multiple coil assemblies are arranged at intervals.

17. A wireless charging system, characterized in that, Includes the foreign object detection system as described in any one of claims 11-16.

18. The wireless charging system according to claim 17, characterized in that, The wireless charging system also includes a wireless transmitting coil, and the foreign object detection system is arranged on the wireless transmitting coil and is adapted to detect foreign objects between the wireless transmitting coil and the wireless receiving coil.

19. The wireless charging system according to claim 18, characterized in that, The wireless charging system also includes a transmitter controller, which is connected to the foreign object detection system and the wireless transmitting coil.

20. The wireless charging system according to claim 19, characterized in that, The foreign object detection system includes a sampling circuit, which is connected to the first detection coil and is connected to each of the second detection coils in a one-to-one correspondence. The transmitter controller is connected to the sampling circuit and the wireless transmission coil.

21. The wireless charging system according to claim 19, characterized in that, The foreign object detection system includes a driving circuit connected to the first detection coil, and the transmitter controller is connected to the driving circuit and the wireless transmission coil.

22. The wireless charging system according to any one of claims 17-21, characterized in that, The wireless charging system also includes a wireless receiving coil, and the foreign object detection system is arranged on the wireless receiving coil and is adapted to detect foreign objects between the wireless receiving coil and the wireless transmitting coil.

23. The wireless charging system according to claim 22, characterized in that, The wireless charging system also includes a receiver controller, which is connected to the foreign object detection system and the wireless receiving coil.

24. The wireless charging system according to claim 23, characterized in that, The foreign object detection system includes a sampling circuit, which is connected to the first detection coil and is connected to each of the second detection coils in a one-to-one correspondence. The receiver controller is connected to the sampling circuit and the wireless receiving coil.

25. The wireless charging system according to claim 23, characterized in that, The foreign object detection system includes a driving circuit connected to the first detection coil, and the receiver controller is connected to the driving circuit and the wireless receiving coil.

26. A vehicle, characterized in that, It includes the coil assembly as claimed in any one of claims 1-10, the foreign object detection system as claimed in any one of claims 11-16, or the wireless charging system as claimed in any one of claims 17-25.

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