Foreign matter removing system and method, wireless charging system and vehicle

Abstract

The invention relates to a foreign matter removing system and method, a wireless charging system and a vehicle. The foreign matter removing system comprises a control module, a driving module and a coil module. The control module is electrically connected with the coil module through the driving module and used for controlling the driving module to output a driving signal to the coil module; the coil module is used for generating a driving magnetic field according to the driving signal so as to apply driving force to the metal foreign matter in the target area where the driving magnetic field is located to drive the metal foreign matter to move out of the target area. The whole system is based on the characteristics of the metal foreign matter, the driving magnetic field generated by the coil module is directly utilized to achieve removal, many mechanical structures do not need to be used, the whole system is simplified, and the reliability of the system is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a foreign matter removal system, method, wireless charging system and vehicle. Background Art

[0002] The wireless charging system in new energy vehicles is an emerging technology that aims to charge electric vehicles through electromagnetic induction or magnetic resonance without the need for traditional cable connections. The main advantages of this technology are its convenience and safety, especially in public charging stations and home charging environments. When the vehicle needs to be charged, it only needs to be parked above the wireless charging ground terminal in the wireless charging system, so that the wireless charging ground terminal and the wireless charging vehicle terminal in the vehicle undergo electromagnetic induction or magnetic resonance, thereby charging the power battery in the vehicle.

[0003] When there is a metal foreign body at the wireless charging end, it is easy to reduce the transmission efficiency of the charging power; in addition, due to the eddy current effect, the metal foreign body is continuously heated, which is easy to cause safety hazards. The existing technology proposes a solution for removing metal foreign bodies, but it uses many mechanical structures, resulting in a complex structure of the entire removal system and low reliability. Summary of the invention

[0004] The embodiments of the present application provide a foreign object removal system, method, wireless charging system and vehicle, which are respectively provided with a control module, a drive module and a coil module. The control module can control the drive module to output a drive signal to the coil module so that the coil module generates a drive magnetic field, thereby applying a driving force to the metal foreign object located in the target area, and then driving the metal foreign object to move outside the target area, thereby achieving the removal of the metal foreign object, so as to at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, a foreign matter removal system is provided, comprising a control module, a drive module and a coil module;

[0006] The control module is electrically connected to the coil module through the drive module, and is used to control the drive module to output a drive signal to the coil module;

[0007] The coil module is used to generate a driving magnetic field according to a driving signal to apply a driving force to a metal foreign object located in a target area where the driving magnetic field is located, so as to drive the metal foreign object to move out of the target area.

[0008] Optionally, the coil module includes a first coil and a moving mechanism connected to the first coil;

[0009] The driving module is electrically connected to the first coil and the moving mechanism respectively, and is used to output a first excitation current to the first coil and a moving control signal to the moving mechanism; the driving signal includes the first excitation current and the moving control signal;

[0010] The first coil is used to generate a first magnetic field according to a first excitation current;

[0011] The moving mechanism is used to control the movement of the first coil according to the moving control signal, so as to obtain a moving magnetic field based on the first magnetic field generated by the first coil; the driving magnetic field includes the moving magnetic field.

[0012] Optionally, the coil module further includes a coil base, and the moving mechanism includes a motor and a lead screw;

[0013] The transmission shaft of the motor is fixedly connected to the lead screw, the first coil is fixedly connected to the coil base, the coil base is threadedly connected to the lead screw, and the motor is electrically connected to the drive module;

[0014] The motor is used to control the rotation of the lead screw according to the movement control signal, so as to drive the first coil to move.

[0015] Optionally, the coil module further includes a shell and a support plate arranged in the shell;

[0016] A first gap is formed between the top surface of the support plate and the top of the shell, and a second gap is formed between a side end of the support plate and the side of the shell;

[0017] The first coil is accommodated in the first gap and connected to the moving mechanism through the second gap.

[0018] Optionally, the coil module includes a second coil and a third coil that are offset;

[0019] The driving module is electrically connected to the second coil and the third coil respectively, and is used to output a second excitation current to the second coil and a third excitation current to the third coil; the driving signal includes the second excitation current and the third excitation current;

[0020] The second coil is used to generate a second magnetic field according to a second excitation current;

[0021] The third coil is used to generate a third magnetic field according to a third excitation current;

[0022] The second magnetic field and the third magnetic field are combined to obtain a traveling wave magnetic field; the driving magnetic field includes the traveling wave magnetic field.

[0023] Optionally, the second coil and the third coil respectively include a plurality of coil portions that are spaced apart, and each coil portion of the second coil is offset from a corresponding coil portion of the third coil.

[0024] Optionally, the driving module includes a DC excitation source and an inverter circuit;

[0025] The inverter circuit is electrically connected to the DC excitation source, the control module and the coil module respectively, and is used to convert the excitation signal provided by the DC excitation source into an AC driving signal under the control of the control module, and output it to the coil module.

[0026] Optionally, the driving module further includes an impedance matching network;

[0027] The inverter circuit is electrically connected to the coil module through an impedance matching network.

[0028] Optionally, the control module is also electrically connected to the coil module to control the drive module to output a detection signal to the coil module and detect the target impedance of the coil module to determine whether there is a metal foreign matter in the area where the drive magnetic field is located according to the target impedance.

[0029] Optionally, the control module includes a controller and an electrical parameter measurement unit;

[0030] The output end of the controller is electrically connected to the driving module, the input end of the controller is electrically connected to the output end of the electrical parameter measuring unit, and the input end of the electrical parameter measuring unit is electrically connected to the coil module;

[0031] The electrical parameter measurement unit is used to detect the target electrical parameters of the coil module and feed back to the controller;

[0032] The controller is used to control the driving module to output a driving signal to the coil module, and to control the driving module to output a detection signal to the coil module, determine the target impedance of the coil module according to the target electrical parameters, and determine whether there is a metal foreign body in the area where the driving magnetic field is located according to the target impedance.

[0033] According to a second aspect of the present application, a foreign matter removal method is provided, which is applied to the foreign matter removal system in any of the above embodiments; the foreign matter removal method comprises the following steps performed by a control module:

[0034] A first control signal is output to the driving module to control the driving module to output a driving signal to the coil module, so that the coil module generates a driving magnetic field according to the driving signal to apply a driving force to the metal foreign matter located in the target area where the driving magnetic field is located, so as to drive the metal foreign matter to move out of the target area.

[0035] Optionally, the input end of the control module is electrically connected to the coil module; the foreign matter removal method further includes the following steps performed by the control module:

[0036] A second control signal is output to the driving module to control the driving module to output a detection signal to the coil module, and detect the target impedance of the coil module, and determine whether there is a metal foreign body in the area where the driving magnetic field is located according to the target impedance.

[0037] Optionally, the foreign matter removal method further includes the following steps performed by the control module:

[0038] If the target impedance exceeds the preset impedance range, it is determined that there is a metal foreign body in the area where the driving magnetic field is located, the detection count value is increased by 1, and a first control signal is output to the driving module;

[0039] Re-entering the step of outputting a second control signal to the driving module until the detection count value exceeds a preset count threshold or the obtained new target impedance does not exceed a preset impedance range;

[0040] If the detected count value exceeds the preset count threshold, a prompt message is output;

[0041] If the obtained new target impedance does not exceed the preset impedance range, the detection count value is cleared.

[0042] According to a third aspect of the present application, a wireless charging system is provided, comprising the foreign object removal system in any one of the above embodiments.

[0043] According to a fourth aspect of the present application, a vehicle is provided, and the vehicle is wirelessly charged by the wireless charging system in any one of the above embodiments.

[0044] The foreign matter removal system of the embodiment of the present application is respectively provided with a control module, a driving module and a coil module. The control module can control the driving module to output a driving signal to the coil module so that the coil module generates a driving magnetic field, thereby applying a driving force to the metal foreign matter located in the target area, and then driving the metal foreign matter to move out of the target area to achieve the removal of the metal foreign matter; based on the characteristics of the metal foreign matter, the entire system directly utilizes the driving magnetic field generated by the coil module to achieve removal, without the use of many mechanical structures, thereby simplifying the entire system and improving the reliability of the system.

[0045] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0047] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0048] Figure 1 is a schematic structural diagram of a foreign matter removal system provided in an exemplary embodiment of the present application;

[0049] Figure 2 is a schematic diagram of a coil module provided in an exemplary embodiment of the present application including a first coil and a moving mechanism;

[0050] Figure 3 is a schematic diagram of a coil module provided in an exemplary embodiment of the present application including a second coil and a third coil;

[0051] Figure 4 is a schematic diagram of a driving module provided in an exemplary embodiment of the present application including a DC excitation source and an inverter circuit;

[0052] Figure 5 is a schematic diagram of a driving module provided in an exemplary embodiment of the present application further comprising an impedance matching network;

[0053] Figure 6 is a schematic diagram showing that the control module provided in the exemplary embodiment of the present application is also electrically connected to the coil module;

[0054] Figure 7 is a schematic diagram of a control module provided in an exemplary embodiment of the present application including a controller and an electrical parameter measurement unit;

[0055] Figure 8 is a schematic diagram of a specific structure of a coil module using a single coil architecture provided in an exemplary embodiment of the present application;

[0056] Fig. 9 yes Figure 8 A cross-sectional view of

[0057] Fig.10 is a signal schematic diagram of a coil module provided in an exemplary embodiment of the present application using a single coil architecture;

[0058] Fig.11 is a schematic diagram of a specific structure of a coil module using a dual-coil architecture provided in an exemplary embodiment of the present application;

[0059] Fig.12 is a signal schematic diagram of a coil module provided in an exemplary embodiment of the present application using a dual-coil architecture;

[0060] Fig.13 Schematic diagram of a foreign matter removal method provided in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0062] According to the first aspect of the present application, Figure 1 As shown, a foreign matter removal system is provided, including a control module 100 , a driving module 200 and a coil module 300 .

[0063] The control module 100 is electrically connected to the coil module 300 through the driving module 200 , and is used to control the driving module 200 to output a driving signal to the coil module 300 .

[0064] The coil module 300 is used to generate a driving magnetic field according to a driving signal to apply a driving force to the metal foreign matter located in the target area where the driving magnetic field is located, so as to drive the metal foreign matter to move out of the target area.

[0065] Among them, the coil in the coil module 300 occupies a certain space, so that a driving magnetic field corresponding to the space can be generated based on a driving signal. The area to which the magnetic field in this area can be radiated can be understood as a target area, and the target area is determined by the space occupied by the coil and its radiation capability.

[0066] In practice, the coil module 300 may be selected in detail according to the cleaning area, so that the target area of ​​the coil module 300 can completely cover the required cleaning area to ensure reliable realization of the cleaning function.

[0067] Specifically, the mechanism by which the driving magnetic field generates driving force on metal foreign bodies mainly involves electromagnetic induction and Lorentz force. For electromagnetic induction, when the driving magnetic field itself changes, according to Faraday's law of electromagnetic induction, an induced electromotive force will be generated in the metal foreign body, and this induced electromotive force will generate an induced current in the metal foreign body; for the Lorentz force, when the free charges (such as electrons) in the metal foreign body move in the driving magnetic field, they will be affected by the Lorentz force, and the direction of the Lorentz force is perpendicular to both the current direction and the driving magnetic field direction; therefore, although the induced electromotive force generated by the metal foreign body itself does not directly generate a driving force, it causes the metal foreign body to be affected by a force in the driving magnetic field by inducing the flow of current.

[0068] The foreign matter removal system of the embodiment of the present application is respectively provided with a control module, a driving module and a coil module. The control module can control the driving module to output a driving signal to the coil module so that the coil module generates a driving magnetic field, thereby applying a driving force to the metal foreign matter located in the target area, and then driving the metal foreign matter to move out of the target area to achieve the removal of the metal foreign matter; based on the characteristics of the metal foreign matter, the entire system directly utilizes the driving magnetic field generated by the coil module to achieve removal, without the use of many mechanical structures, thereby simplifying the entire system and improving the reliability of the system.

[0069] like Figure 2 As shown, optionally, the coil module 300 includes a first coil 301 and a moving mechanism 302 connected to the first coil 301 .

[0070] The driving module 200 is electrically connected to the first coil 301 and the moving mechanism 302 respectively, and is used to output a first excitation current to the first coil 301 and a movement control signal to the moving mechanism 302; the driving signal includes the first excitation current and the movement control signal.

[0071] The first coil 301 is used to generate a first magnetic field according to a first excitation current.

[0072] The moving mechanism 302 is used to control the movement of the first coil 301 according to the movement control signal, so as to obtain a moving magnetic field based on the first magnetic field generated by the first coil 301; the driving magnetic field includes the moving magnetic field.

[0073] in, Figure 2 Only the electrical connection relationship between the driving module 200, the first coil 301 and the moving mechanism 302 is shown, and the mechanical connection relationship between the first coil 301 and the moving mechanism 302 is not shown, and the mechanical connection relationship depends on the specific structure of the moving mechanism 302. The moving mechanism 302 is used to drive the first coil 301 to move, and the moving mechanism 302 can adopt any type of specific structure as long as it can realize the movement of the first coil 301, for example, the moving mechanism 302 can be an automated manipulator, etc.

[0074] It can be understood that the first coil 301 can generate a stable first magnetic field according to the first excitation current connected, and the moving mechanism 302 can drive the first coil 301 to move. When the first coil 301 moves, the first magnetic field generated by it also moves accordingly, thereby forming a moving magnetic field. The formed moving magnetic field can interact with the induced current in the metal foreign object, thereby achieving the driving of the metal foreign object.

[0075] It should be noted that, when there is a moving mechanism 302 , the corresponding moving control signal and the first excitation current corresponding to the first coil 301 may be output by the same driving module or by different driving modules.

[0076] like Figure 3 As shown, optionally, the coil module 300 includes a second coil 303 and a third coil 304 that are offset.

[0077] The driving module 200 is electrically connected to the second coil 303 and the third coil 304 respectively, and is used to output a second excitation current to the second coil 303 and a third excitation current to the third coil 304; the driving signal includes the second excitation current and the third excitation current.

[0078] The second coil 303 is used to generate a second magnetic field according to a second excitation current.

[0079] The third coil 304 is used to generate a third magnetic field according to a third excitation current.

[0080] The second magnetic field and the third magnetic field are combined to obtain a traveling wave magnetic field; the driving magnetic field includes the traveling wave magnetic field.

[0081] Among them, the above embodiments have mentioned that a magnetic field can be generated by a single first coil, and on this basis, a moving mechanism is used to drive the movement of the first coil to obtain a moving magnetic field. In this embodiment, there is no need to set a moving mechanism, and two second coils 303 and third coils 304 with a certain offset in position can be set respectively, and the second magnetic field and the third magnetic field generated by the two can be used to obtain a traveling wave magnetic field moving in a certain direction. The obtained traveling wave magnetic field can play a role that is basically the same as the moving magnetic field in the above embodiments, thereby achieving the driving of metal foreign matter.

[0082] Specifically, in order to obtain the corresponding traveling wave magnetic field after combining the second magnetic field and the third magnetic field, it is necessary to control the second coil 303 and the third coil 304 to respectively connect to the second excitation current and the third excitation current that meet the requirements. The second excitation current and the third excitation current have the same period, frequency and amplitude but different phases. Combined with the position offset of the second coil 303 and the third coil 304, it can be ensured that the two can generate the second magnetic field and the third magnetic field that meet the requirements.

[0083] Among them, in this embodiment, the coil module 300 only includes two groups of coils, namely the second coil 303 and the third coil 304, while in other embodiments, it can also include more groups of coils, such as three groups, four groups or five groups, etc. The coil architectures with different numbers of groups have corresponding implementation principles that are similar and will not be repeated here.

[0084] like Figure 4 As shown, optionally, the driving module 200 includes a DC excitation source 201 and an inverter circuit 202 .

[0085] The inverter circuit 202 is electrically connected to the DC excitation source 201 , the control module 100 and the coil module 300 respectively, and is used to convert the excitation signal provided by the DC excitation source 201 into an AC driving signal under the control of the control module 100 , and output it to the coil module 300 .

[0086] When the coil module 300 is connected to an alternating current, it can generate a changing magnetic field to achieve the driving of the metal foreign body. Therefore, when the excitation source is a DC excitation source 201, a corresponding inverter circuit 202 needs to be provided, through which the DC signal output by the DC excitation source 201 can be inverted into an AC signal to ensure the stable operation of the coil module 300.

[0087] like Figure 5 As shown, optionally, the driving module 200 further includes an impedance matching network 203 .

[0088] The inverter circuit 202 is electrically connected to the coil module 300 via an impedance matching network 203 .

[0089] Among them, impedance matching plays a key role in electrical and electronic systems, mainly including maximum transmission power, reducing signal reflections and improving system efficiency. Specifically, according to the maximum power transfer theorem, when the load impedance is equal to the source impedance, the system can achieve maximum power transmission; in transmission lines (such as coaxial cables or microstrip lines), impedance mismatch will cause signal reflections, which will cause signal distortion and power loss. Through impedance matching, reflections can be minimized and signal integrity can be improved; impedance matching can improve the overall efficiency of the system and reduce unnecessary energy loss.

[0090] Based on the above statements, this embodiment adds an impedance matching network between the inverter circuit 202 and the coil module 300, which can improve the quality and power efficiency of the drive signal output to the coil module 300, thereby improving the accuracy and efficiency of removing metal foreign matter.

[0091] like Figure 6 As shown, optionally, the control module 100 is also electrically connected to the coil module 300, and is used to control the driving module 200 to output a detection signal to the coil module 300, and detect the target impedance of the coil module 300, so as to determine whether there is a metal foreign matter in the area where the driving magnetic field is located according to the target impedance.

[0092] Among them, as in the above embodiment, when the coil module 300 is connected to the detection signal, it will still generate a corresponding magnetic field, which can be understood as a detection magnetic field. If there is a metal foreign body within the radiation range of the detection magnetic field, it will cause a local change in the detection magnetic field, thereby causing the impedance of the corresponding current loop of the coil module 300 to change. Therefore, after the control module 100 controls the drive module 200 to output a detection signal to the coil module 300, it can detect the target impedance of the coil module 300, and finally determine whether there is a metal foreign body in the area based on the target impedance.

[0093] Thereafter, if the control module 100 determines that there is a metal foreign object, the control driving module 200 outputs a driving signal to the coil module 300 to implement a corresponding foreign object removal operation. For details, please refer to the above embodiment and will not be described again.

[0094] It is understandable that the detection signal for detection and the driving signal for driving can be the same signal or different signals. However, it should be noted that since in the wireless charging system, the wireless charging ground also charges the vehicle through a magnetic field, in order to ensure that the removal of foreign objects does not affect the normal charging of the vehicle, the detection signal used for detection during the removal process and the driving signal used for driving must be significantly different from the charging signal used for charging.

[0095] Specifically, since the detection signal is only used to obtain the target impedance of the coil module 300, it does not have high requirements for the magnitude of the excitation current, while the drive signal is used to control the coil module 300 to generate a driving magnetic field that can drive the metal foreign matter, so it has high requirements for the magnitude of the excitation current. Therefore, the current of the detection signal can be smaller than the current of the drive signal, so that it can ensure the realization of the detection function and the drive function, and can save unnecessary power consumption during the detection process.

[0096] Specifically, the frequencies of the detection signal and the drive signal output by the inverter circuit 202 are greatly different from the operating frequency of the transmitting coil used for charging. Usually, the operating frequency of the transmitting coil is several hundred KHz, and the frequencies of the detection signal and the drive signal can be set to the MHz level.

[0097] like Figure 7 As shown, optionally, the control module 100 includes a controller 101 and an electrical parameter measurement unit 102 .

[0098] The output end of the controller 101 is electrically connected to the driving module 200 , the input end of the controller 101 is electrically connected to the output end of the electrical parameter measuring unit 102 , and the input end of the electrical parameter measuring unit 102 is electrically connected to the coil module 300 .

[0099] The electrical parameter measuring unit 102 is used to detect the target electrical parameters of the coil module 300 and feed back the target electrical parameters to the controller 101 .

[0100] Among them, the target electrical parameters include target current, target voltage and other parameters.

[0101] The controller 101 is used to control the driving module 200 to output a driving signal to the coil module 300, and to control the driving module 200 to output a detection signal to the coil module 300, determine the target impedance of the coil module 300 according to the target electrical parameters, and determine whether there is a metal foreign matter in the driving magnetic field area according to the target impedance.

[0102] Among them, the controller 101 serves as the control core of the control module 100 and is responsible for all related control operations; during the detection process, it controls the driving module 200 to output a detection signal and calculates the corresponding target impedance; during the driving process, it controls the driving module 200 to output a driving signal.

[0103] After the controller 101 obtains the target voltage and target current fed back by the electrical parameter measurement unit 102, it can perform the corresponding impedance calculation to obtain the corresponding target impedance. If the target impedance deviates too much from the expected value, it indicates that there is a metal foreign body, otherwise it indicates that there is no metal foreign body.

[0104] The controller 101 can control the inverter circuit 202 to output different excitation currents by means of PWM control.

[0105] like Figure 8 and Fig. 9 As shown, optionally, the coil module further includes a coil base 43 , and the moving mechanism includes a motor 41 and a lead screw 42 .

[0106] The transmission shaft of the motor 41 is fixedly connected to the screw rod 42 , the first coil 301 is fixedly connected to the coil base 43 , the coil base 43 is threadedly connected to the screw rod 42 , and the motor 41 is electrically connected to the driving module.

[0107] in, Figure 8 and Fig. 9 Only the mechanical connection relationship between the internal structures of the coil module is shown, and the electrical connection relationship between the coil module and the driving module, etc. is not shown.

[0108] The motor 41 is used to control the rotation of the lead screw 42 according to the movement control signal, so as to drive the first coil 301 to move.

[0109] Among them, since the first coil 301 is fixed on the coil base 43, and the coil base 43 is sleeved on the screw rod 42, when the motor 41 controls the screw rod 42 to rotate, the coil base 43 will move along the axial direction of the screw rod 42, thereby driving the first coil 301 to move, thereby achieving the removal of the metal foreign matter 1.

[0110] like Figure 8 and Fig. 9 As shown, optionally, the coil module further includes a shell 3 and a support plate 2 arranged in the shell 3 .

[0111] A first gap is formed between the top surface of the support plate 2 and the top of the shell 3 , and a second gap is formed between one side end of the support plate 2 and the side of the shell 3 .

[0112] The first coil 301 is received in the first gap and fixedly connected to the coil base 43 through the second gap.

[0113] Among them, the support plate 2 can be combined with the shell 3 to form a smaller first gap and a smaller second gap, so that when compressed, its deformation is within the reversible deformation range, and the anti-crushing ability can be improved on the basis of ensuring the movement of the first coil 301. Since the foreign matter removal system of the present application is usually set at the wireless charging ground end, it is faced with the situation of vehicle crushing. Therefore, through the arrangement of this embodiment, it can be ensured that the normal use function will not be lost due to vehicle crushing.

[0114] in, Fig.10 It can be used as a detection signal or a driving signal connected to the first coil 301. When it is a detection signal, it adopts a small current excitation; when it is a driving signal, it adopts a large current excitation.

[0115] like Fig.11 As shown, optionally, the second coil 303 and the third coil 304 respectively include a plurality of coil portions arranged at intervals, and each coil portion of the second coil 303 is offset from a corresponding coil portion in the third coil 304 .

[0116] Among them, the driving effect can be improved by using a plurality of coil units.

[0117] When the second excitation current and the third excitation current with different phases are provided to the second coil 303 and the third coil 304 respectively, the second coil 303 and the third coil 304 can be combined to generate a traveling wave magnetic field, thereby removing the metal foreign matter 1.

[0118] in, Fig.12The excitation current A and the excitation current B in the circuit can be used as the second excitation current of the second coil 303 and the third excitation current of the third coil 304 respectively. The excitation current A and the excitation current B are modulated by the carrier and the corresponding modulation wave A and modulation wave B. The carrier can use the excitation current in the detection signal or the first excitation current in the drive signal involved in the above-mentioned single-coil embodiment, such as a frequency of MHz. The phases of the modulation wave A and the modulation wave B are different, and the frequencies of the two are lower than the operating frequency of the transmitting coil in the wireless charging system. For example, the modulation wave A and the modulation wave B can be set to several hundred Hz.

[0119] The detection signal in this embodiment may adopt the detection signal involved in the above-mentioned single-coil embodiment, which will not be described in detail here.

[0120] It should be noted that, when the second coil 303 and the third coil 304 exist at the same time, the second excitation current and the third excitation current corresponding to the two coils may be output by the same driving module or may be output by different driving modules respectively.

[0121] According to a second aspect of the present application, a foreign matter removal method is provided, which is applied to the foreign matter removal system in any of the above embodiments; the foreign matter removal method comprises the following steps performed by a control module:

[0122] A first control signal is output to the driving module to control the driving module to output a driving signal to the coil module, so that the coil module generates a driving magnetic field according to the driving signal to apply a driving force to the metal foreign matter located in the target area where the driving magnetic field is located, so as to drive the metal foreign matter to move out of the target area.

[0123] The above embodiments have mentioned that the control module can control the driving module by means of PWM control. Therefore, the first control signal output by the control module in this embodiment may also include a first PWM control signal.

[0124] The foreign matter removal system used in the foreign matter removal method of the embodiment of the present application is respectively provided with a control module, a drive module and a coil module. The control module can control the drive module to output a drive signal to the coil module so that the coil module generates a drive magnetic field, thereby applying a driving force to the metal foreign matter located in the target area, and then driving the metal foreign matter to move outside the target area to achieve the removal of the metal foreign matter; based on the characteristics of the metal foreign matter, the entire system directly utilizes the drive magnetic field generated by the coil module to achieve removal, without the use of many mechanical structures, thereby simplifying the entire system and improving the reliability of the system.

[0125] Optionally, the input end of the control module is electrically connected to the coil module; the foreign matter removal method further includes the following steps performed by the control module:

[0126] A second control signal is output to the driving module to control the driving module to output a detection signal to the coil module, and detect the target impedance of the coil module, and determine whether there is a metal foreign body in the area where the driving magnetic field is located according to the target impedance.

[0127] Wherein, as in the above embodiment, the second control signal output by the control module in this embodiment may also include a second PWM control signal.

[0128] like Fig.13 As shown, optionally, the foreign matter removal method further includes the following steps performed by the control module:

[0129] If the target impedance exceeds the preset impedance range, it is determined that there is a metal foreign object in the area where the driving magnetic field is located, the detection count value is increased by 1, and a first control signal is output to the driving module.

[0130] After the first control signal is output to the driving module, a foreign matter removal operation can be performed through the driving module and the coil module. However, it should be noted that performing the foreign matter removal operation does not necessarily lead to successful removal of the foreign matter.

[0131] When performing impedance detection, the detection may be performed according to a preset period, for example, once every 5 seconds.

[0132] The step of outputting the second control signal to the driving module is re-entered until the detection count value exceeds the preset count threshold or the obtained new target impedance does not exceed the preset impedance range.

[0133] When the detection count value exceeds the preset count threshold, it means that the foreign object has not been successfully removed after multiple foreign object removal operations, and the volume or weight of the foreign object may be large. In one example, the preset count threshold can be set to 3.

[0134] Among them, when the new target impedance does not exceed the preset impedance range, it means that the foreign matter has been successfully removed after a controllable number of foreign matter removal operations.

[0135] If the detected count value exceeds the preset count threshold, a prompt message is output.

[0136] Among them, as mentioned above, exceeding the preset counting threshold indicates that the volume or weight of the foreign matter is large and cannot be removed by the automatic removal system and method of the present application. Therefore, it is necessary to output a prompt message to prompt relevant personnel to perform manual intervention.

[0137] If the obtained new target impedance does not exceed the preset impedance range, the detection count value is cleared.

[0138] As mentioned above, if the new target impedance does not exceed the preset impedance range, it means that the foreign object has been successfully removed after a controllable number of foreign object removal operations, so the previously accumulated detection count value can be reset to facilitate the next detection. At the same time, when a foreign object is detected, it will affect wireless charging, so the energy transmitting coil needs to be controlled to stop working; after the foreign object is removed, the energy transmitting coil can be restarted.

[0139] According to a third aspect of the present application, a wireless charging system is provided, comprising the foreign object removal system in any one of the above embodiments.

[0140] Among them, the control module in the foreign object removal system can communicate with the ground end controller and / or the vehicle controller in the vehicle end of the wireless charging system.

[0141] The foreign object removal system in the wireless charging system of the embodiment of the present application is respectively provided with a control module, a driving module and a coil module. The control module can control the driving module to output a driving signal to the coil module so that the coil module generates a driving magnetic field, thereby applying a driving force to the metal foreign objects located in the target area, and then driving the metal foreign objects to move outside the target area to achieve the removal of the metal foreign objects; based on the characteristics of the metal foreign objects, the entire system directly utilizes the driving magnetic field generated by the coil module to achieve removal, without the use of many mechanical structures, thereby simplifying the entire system and improving the reliability of the system.

[0142] According to a fourth aspect of the present application, a vehicle is provided, and the vehicle is wirelessly charged by the wireless charging system in any one of the above embodiments.

[0143] The vehicle may be a pure electric vehicle, a plug-in hybrid vehicle, a range-extended hybrid vehicle or other new energy vehicle, and this application does not make any specific limitation on this.

[0144] The foreign object removal system used in the vehicle of the embodiment of the present application is respectively provided with a control module, a drive module and a coil module. The control module can control the drive module to output a drive signal to the coil module so that the coil module generates a drive magnetic field, thereby applying a driving force to the metal foreign objects located in the target area, and then driving the metal foreign objects to move outside the target area to achieve the removal of the metal foreign objects; based on the characteristics of the metal foreign objects, the entire system directly utilizes the drive magnetic field generated by the coil module to achieve removal, without the use of many mechanical structures, thereby simplifying the entire system and improving the reliability of the system.

[0145] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0146] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0147] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0148] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. In the embodiments of the present application, the description of each embodiment has its own focus. For the parts not described in detail in a certain embodiment, please refer to the relevant contents of other embodiments. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A foreign matter removal system, characterized in that: It includes a control module, a drive module and a coil module; The control module is electrically connected to the coil module through the driving module, and is used to control the driving module to output a driving signal to the coil module; The coil module is used to generate a driving magnetic field according to the driving signal to apply a driving force to a metal foreign object located in a target area where the driving magnetic field is located, so as to drive the metal foreign object to move out of the target area.

2. The foreign matter removal system according to claim 1, characterized in that: The coil module includes a first coil and a moving mechanism connected to the first coil; The driving module is electrically connected to the first coil and the moving mechanism respectively, and is used to output a first excitation current to the first coil and output a movement control signal to the moving mechanism; the driving signal includes the first excitation current and the movement control signal; The first coil is used to generate a first magnetic field according to the first excitation current; The moving mechanism is used to control the movement of the first coil according to the movement control signal, so as to obtain a moving magnetic field based on the first magnetic field generated by the first coil; and the driving magnetic field includes the moving magnetic field.

3. The foreign matter removal system according to claim 2, characterized in that: The coil module also includes a coil base, and the moving mechanism includes a motor and a lead screw; The transmission shaft of the motor is fixedly connected to the screw rod, the first coil is fixedly connected to the coil base, the coil base is threadedly connected to the screw rod, and the motor is electrically connected to the driving module; The motor is used to control the rotation of the lead screw according to the movement control signal, so as to drive the first coil to move.

4. The foreign matter removal system according to claim 2 or 3, characterized in that: The coil module also includes a shell and a support plate arranged in the shell; A first gap is formed between the top surface of the support plate and the top of the shell, and a second gap is formed between a side end of the support plate and the side of the shell; The first coil is accommodated in the first gap and connected to the moving mechanism through the second gap.

5. The foreign matter removal system according to claim 1, characterized in that: The coil module includes a second coil and a third coil that are offset; The driving module is electrically connected to the second coil and the third coil respectively, and is used to output a second excitation current to the second coil and a third excitation current to the third coil; the driving signal includes the second excitation current and the third excitation current; The second coil is used to generate a second magnetic field according to the second excitation current; The third coil is used to generate a third magnetic field according to the third excitation current; The second magnetic field and the third magnetic field are combined to obtain a traveling wave magnetic field; the driving magnetic field includes the traveling wave magnetic field.

6. The foreign matter removal system according to claim 5, characterized in that: The second coil and the third coil respectively include a plurality of coil portions arranged at intervals, and each coil portion of the second coil is offset from a corresponding coil portion of the third coil.

7. The foreign matter removal system according to claim 1, characterized in that: The driving module includes a DC excitation source and an inverter circuit; The inverter circuit is electrically connected to the DC excitation source, the control module and the coil module respectively, and is used to convert the excitation signal provided by the DC excitation source into an AC drive signal under the control of the control module, and output it to the coil module.

8. The foreign matter removal system according to claim 7, characterized in that: The driving module also includes an impedance matching network; The inverter circuit is electrically connected to the coil module through the impedance matching network.

9. The foreign matter removal system according to claim 1, characterized in that: The control module is also electrically connected to the coil module, and is used to control the drive module to output a detection signal to the coil module, and detect the target impedance of the coil module, so as to determine whether there is a metal foreign matter in the area where the drive magnetic field is located according to the target impedance.

10. The foreign matter removal system according to claim 9, characterized in that: The control module includes a controller and an electrical parameter measurement unit; The output end of the controller is electrically connected to the driving module, the input end of the controller is electrically connected to the output end of the electrical parameter measuring unit, and the input end of the electrical parameter measuring unit is electrically connected to the coil module; The electrical parameter measuring unit is used to detect the target electrical parameters of the coil module and feed back to the controller; The controller is used to control the driving module to output the driving signal to the coil module, and to control the driving module to output the detection signal to the coil module, determine the target impedance of the coil module according to the target electrical parameters, and determine whether the metal foreign matter exists in the area where the driving magnetic field is located according to the target impedance.

11. A method for removing foreign matter, characterized in that: Applicable to the foreign matter removal system according to any one of claims 1 to 10; the foreign matter removal method comprises the following steps performed by the control module: A first control signal is output to the driving module to control the driving module to output a driving signal to the coil module, so that the coil module generates a driving magnetic field according to the driving signal to apply a driving force to the metal foreign matter located in the target area where the driving magnetic field is located, so as to drive the metal foreign matter to move outside the target area.

12. The foreign matter removing method according to claim 11, characterized in that: The input end of the control module is electrically connected to the coil module; the foreign matter removal method further includes the following steps performed by the control module: A second control signal is output to the driving module to control the driving module to output a detection signal to the coil module, and detect the target impedance of the coil module, and determine whether there is a metal foreign body in the area where the driving magnetic field is located according to the target impedance.

13. The foreign matter removing method according to claim 12, characterized in that: The foreign matter removal method further includes the following steps performed by the control module: If the target impedance exceeds the preset impedance range, it is determined that there is a metal foreign object in the area where the driving magnetic field is located, the detection count value is increased by 1, and the first control signal is output to the driving module; Re-entering the step of outputting a second control signal to the driving module until the detection count value exceeds a preset count threshold or the obtained new target impedance does not exceed the preset impedance range; If the detection count value exceeds the preset count threshold, output a prompt message; If the obtained new target impedance does not exceed the preset impedance range, the detection count value is cleared.

14. A wireless charging system, characterized in that: A foreign body removal system comprising any one of claims 1 to 10.

15. A vehicle, characterized in that: The vehicle is wirelessly charged by the wireless charging system according to claim 14.

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