Wireless charging system and control method thereof

Abstract

The invention discloses a wireless charging system and a control method thereof, and belongs to the technical field of wireless charging, the wireless charging system comprises a power supply module and a receiving module, the power supply module comprises a first coupler, the receiving module comprises a second coupler, and the first coupler and the second coupler are mutually coupled; the first coupler comprises a first coil, a first magnet and a third magnet; the second coupler comprises a second coil and a second magnet; the first coil is wound on the first magnet; the second coil is wound on the second magnet; the third magnet is connected to the inner side of the first magnet and used for reducing a gap in the vertical direction between the first magnet and the second magnet, so that a closed magnetic loop meeting preset requirements is formed between the first coupler and the second coupler; according to the invention, magnetic leakage can be avoided, the coupling degree is improved, the power transmission power is improved, the size and weight of the second magnet are reduced, and the higher lightweight requirement is met.

Description

Technical Field

[0001] The invention relates to a wireless charging system and a control method thereof, and belongs to the technical field of wireless charging. Background Art

[0002] Wireless charging of electric vehicles can avoid manual operation, greatly improving the convenience of charging. Figure 1 As shown, the energy source 1 can be a power grid, or an energy storage device, etc., to provide a power source. The AC or DC power input by the power conversion device 2 is converted into high-frequency AC power, including an inverter; the power conversion device 2 also includes a resonant network to resonate with the coupler. The first coupler 3 and the second coupler 4 can include a coil that transmits energy based on the principle of electromagnetic induction, or a capacitor plate that transmits energy based on the principle of electric field; the coupler also includes a magnet with high magnetic permeability, which can be ferrite, or a magnet with high magnetic permeability such as nanocrystal.

[0003] After the vehicle stops, wireless power transmission based on magnetic induction coupling is realized, such as Figure 2 As shown. However, there may be a distance in the spatial direction between the second coupler 4 and the first coupler 3, which can be considered as the XYZ direction. There is a large gap between the receiving coil on the vehicle and the transmitting coil on the ground, which causes a large amount of magnetic leakage and leads to magnetic radiation problems; in addition, the large distance between the transmitting coil and the receiving coil makes the two coils in a weak coupling state, and the mutual inductance is small, which is not conducive to high-power transmission and the improvement of power transmission efficiency; because the coupler where the receiving coil is located is generally installed on a mobile device, the size and weight are required to be as small as possible, but there is no such technology in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a wireless charging system and a control method thereof, so as to solve the problems existing in the prior art such as magnetic leakage, weak coupling, low transmission power and inability to reduce volume and weight.

[0005] To achieve the above objectives, the present invention is implemented by adopting the following technical solutions:

[0006] The present invention provides a wireless charging system, including: a power supply module and a receiving module, the power supply module includes a first coupler, the receiving module includes a second coupler, the first coupler and the second coupler are coupled to each other; the first coupler includes a first coil, a first magnet and a third magnet; the second coupler includes a second coil and a second magnet; the first coil is wound around the first magnet; the second coil is wound around the second magnet; the third magnet is connected to the inner side of the first magnet, and is used to reduce the vertical gap between the first magnet and the second magnet, so that a closed magnetic circuit that meets preset requirements is formed between the first coupler and the second coupler.

[0007] In combination with the first aspect, further, a judgment condition for forming a closed magnetic circuit that meets preset requirements between the first coupler and the second coupler is that a coupling coefficient between the first coil and the second coil is greater than a set value.

[0008] In combination with the first aspect, further, the third magnet includes two magnet parts, and the two magnet parts are respectively arranged on the inner sides of the left and right sides of the first magnet, so that the third magnet fills the vertical gap between the first magnet and the second magnet.

[0009] In combination with the first aspect, further, the first magnet, the second magnet and the third magnet are magnetic conductive materials with a relative magnetic permeability greater than 100, and the magnetic conductive materials include manganese zinc ferrite, amorphous and nanocrystalline.

[0010] In combination with the first aspect, further, the magnetic conductive material includes several layers of strips connected in sequence, and the outer surface of the strips is divided into a flux surface and a non-flux surface. When the flux surfaces of two strips are connected / aligned, the magnetic circuit can be connected. The third magnet and the first magnet are connected through the flux surface of the strip, and the part where the third magnet and the second magnet are aligned is the flux surface of the strip, so as to form a magnetic circuit whose magnetic resistance meets preset requirements.

[0011] In combination with the first aspect, further, in the third magnet, a cross-sectional area of ​​a portion aligned with the second magnet is larger than a cross-sectional area of ​​a portion not aligned with the second magnet.

[0012] In combination with the first aspect, further, the third magnet is arranged on the inner side of the left and right edges of the first magnet, and there is a preset distance between the third magnet and the surface of the recessed portion of the first magnet, and the preset distance is used to set the first coil;

[0013] When the third magnet rises, the space released by the preset distance enables the first magnet and the third magnet to have space to move without interfering with the first coil.

[0014] In combination with the first aspect, further, the magnet portion includes a plurality of magnets, and the plurality of magnets are slidably connected to each other to increase the height of the third magnet in the vertical direction.

[0015] In combination with the first aspect, further, the third magnet is hinged to the first magnet, and the third magnet includes two magnet parts, and the two magnet parts are hinged to the left and right sides of the first magnet respectively.

[0016] In combination with the first aspect, further, the magnet portion includes a plurality of magnets, and the plurality of magnets are telescopically connected in sequence, so that the distance between the upper portion of the third magnet and the lower portion of the second magnet is reduced.

[0017] In combination with the first aspect, further, the magnet part includes a first component, a second component and a third component, the first component and the first magnet are hinged, the second component and the first component are telescopically connected, and the third component and the second component are hinged.

[0018] In combination with the first aspect, further, the third components of the two magnet parts are respectively hinged to two ends of the first bracket.

[0019] In combination with the first aspect, further, the system also includes a controller and a three-axis moving mechanism, the controller controls the three-axis moving mechanism to realize the movement of the third magnet in three directions of X, Y and Z; wherein the X direction is a direction in the horizontal plane perpendicular to the vehicle where the second coupler is located, the Y direction is perpendicular to the X direction, and the Z direction is a vertical direction.

[0020] In combination with the first aspect, further, the three-axis moving mechanism includes a first motor, a second motor and a third motor, and also includes an X-direction moving mechanism, a Y-direction moving mechanism and a Z-direction moving mechanism;

[0021] The first magnet is connected to the X-direction moving mechanism and the Y-direction moving mechanism respectively, the controller controls the first motor to operate, thereby driving the X-direction moving mechanism to drive the first magnet to move in the X direction, thereby driving the third magnet to move in the X direction, and the controller controls the second motor to operate, thereby driving the Y-direction moving mechanism to drive the first magnet to move in the Y direction, thereby driving the third magnet to move in the Y direction;

[0022] The third magnet is connected to the Z-direction moving mechanism, and the controller controls the third motor to operate, thereby driving the Z-direction moving mechanism to drive the third magnet to move in the Z direction.

[0023] In a second aspect, the present invention further provides a control method of the system according to any one of the first aspects, comprising:

[0024] S1. When the vehicle equipped with the second coupler parks at the parking space equipped with the first coupler, proceed to step S2;

[0025] S2, the positioning device detects the spatial position of the second magnet in the second coupler and transmits it to the controller;

[0026] S3, the controller calculates the distances that the X, Y and Z axes need to move according to the obtained spatial position of the second magnet;

[0027] S4, the controller drives each motor in the three-axis moving mechanism, uses the three-axis moving mechanism to transmit to the third magnet, and finally moves the third magnet so that the first magnet, the second magnet and the third magnet form a magnetic circuit that meets the preset conditions;

[0028] S5, the positioning device detects the relative distance between the second magnet and the third magnet;

[0029] S6, judging whether the second magnet and the third magnet are aligned according to the detected relative distance, if not, returning to step S2, if aligned, proceeding to step S7;

[0030] S7, checking whether the charging conditions are met and waiting for charging and discharging instructions;

[0031] S8. If the charging conditions are met, according to the received charging instruction, the power conversion device connected to the power source is set as an inverter, and the power conversion device connected to the battery is set as a rectifier to start charging; according to the received discharging instruction, the power conversion device connected to the power source is set as a rectifier, and the power conversion device connected to the battery is set as an inverter to start discharging.

[0032] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0033] The wireless charging system and control method provided by the present invention add a third magnet between the first magnet and the second magnet to narrow the gap between the two and avoid magnetic leakage, thereby forming a closed magnetic circuit with a small air gap, improving the degree of coupling, and thus improving the power transmission power. The third magnet is arranged on the inner side of the first magnet, and the third magnet and the second magnet are coupled through the third magnet, so that the upper limit of the width of the second magnet can be reduced to the distance from the outer edge of the third magnet, thereby reducing the volume and weight of the second magnet and meeting higher lightweight requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the wireless charging principle;

[0035] Figure 2 This is a schematic diagram of the wireless charging principle for electric vehicles;

[0036] Figure 3 is a schematic structural diagram of the wireless charging system provided by Embodiment 1 of the present invention during charging;

[0037] Figure 4 This is one of the structural schematic diagrams of the wireless charging system provided by Embodiment 2 of the present invention during charging;

[0038] Figure 5 This is the second structural schematic diagram of the wireless charging system provided by Embodiment 2 of the present invention during charging;

[0039] Figure 6 This is the third structural schematic diagram of the wireless charging system provided by Embodiment 2 of the present invention during charging;

[0040] Figure 7 This is a fourth structural schematic diagram of the wireless charging system provided by Embodiment 2 of the present invention during charging;

[0041] Figure 8 This is one of the structural schematic diagrams of the wireless charging system provided by Embodiment 3 of the present invention during charging;

[0042] Fig. 9 This is the second structural schematic diagram of the wireless charging system provided by Embodiment 3 of the present invention during charging;

[0043] Fig.10 This is the third structural schematic diagram of the wireless charging system provided by Embodiment 3 of the present invention during charging;

[0044] Fig.11 This is one of the structural schematic diagrams of the wireless charging system provided by Embodiment 4 of the present invention during charging;

[0045] Fig.12 This is the second structural schematic diagram of the wireless charging system provided by Embodiment 4 of the present invention during charging;

[0046] Fig.13 It is a structural diagram of a three-axis moving mechanism;

[0047] Fig.14 It is one of the schematic diagrams of the three-axis moving mechanism provided in Example 5 of the present invention;

[0048] Fig.15 It is one of the schematic diagrams of the three-axis moving mechanism provided in Example 6 of the present invention;

[0049] Fig.16 This is the second schematic diagram of the three-axis moving mechanism provided by Example 6 of the present invention;

[0050] Fig.17 This is the third schematic diagram of the three-axis moving mechanism provided in Example 6 of the present invention;

[0051] Fig.18 This is one of the system framework diagrams of the wireless charging system provided by Embodiment 6 of the present invention;

[0052] Fig.19 This is the second system framework diagram of the wireless charging system provided by Embodiment 6 of the present invention;

[0053] Fig. 20 is a flow chart of a control method for a wireless charging system provided by Embodiment 7 of the present invention;

[0054] Fig.21 It is a structural schematic diagram of the wireless charging system provided in Example 8 of the present invention.

[0055] In the figure: 1, energy source; 2, power conversion device; 3, first coupler; 4, second coupler; 5, battery; 6, first coil; 7, first magnet; 8, third magnet; 9, second magnet; 10, second coil; 11, first bracket; 101, third electric push rod; 102, first bracket arm; 103, second bracket arm; 104, first crossbeam; 105, third track; 201, second electric push rod; 202, first track; 203, first slider; 204, second track; 301, first electric push rod; 302, second slider; 303, guide rod; 401, first component; 402, second component; 403, third component; 404, spring; 601, second slider; 602, second bracket; 70 1. First bracket; 702. Third bracket; 703. Fourth bracket; 704. Fifth bracket; 705. First left bracket arm; 706. Second left bracket arm; 707. First right bracket arm; 708. Second right bracket arm; 709. First screw rod; 710. Second screw rod; 711. Third screw rod; 712. First bevel gear; 713. Second bevel gear; 714. Third bevel gear; 715. Fourth bevel gear; 716. Third slider; 717. Transmission rod; 718. Third motor; 719. Base; 801. First motor; 802. Fourth screw rod; 803. Fifth screw rod; 804. Sixth screw rod; 807. Seventh bevel gear; 808. Eighth bevel gear; 809. Magnet bracket; 810. Seventh screw rod. DETAILED DESCRIPTION

[0056] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the protection scope of the present invention.

[0057] Embodiment 1: The present invention provides a wireless charging system, such as Figure 1 and Figure 3 As shown, it includes: a power supply module and a receiving module, the power supply module includes a first coupler 3, the receiving module includes a second coupler 4, the first coupler 3 and the second coupler 4 are coupled to each other; the first coupler 3 includes a first coil 6, a first magnet 7 and a third magnet 8; the second coupler 4 includes a second coil 10 and a second magnet 9; the first coil 6 is wound around the first magnet 7; the second coil 10 is wound around the second magnet 9; the third magnet 8 is connected to the inner side of the first magnet 7, and is used to reduce the vertical gap between the first magnet 7 and the second magnet 9, so that a closed magnetic circuit that meets the preset requirements is formed between the first coupler 3 and the second coupler 4.

[0058] The judgment condition for forming a closed magnetic circuit that meets the set requirements between the first coupler 3 and the second coupler 4 is that the coupling coefficient between the first coil 6 and the second coil 10 is greater than a preset value.

[0059] The third magnet 8 includes two magnet parts, which are respectively arranged on the inner sides of the left and right sides of the first magnet 7 , so that the third magnet 8 fills the gap between the first magnet 7 and the second magnet 9 in the vertical direction.

[0060] In the prior art, the displacement between the first magnet 7 and the second magnet 9 is resisted by enlarging the sizes of the first magnet 7 and the second magnet 9. However, in actual situations, the second magnet 9 is generally installed on a mobile device, such as a vehicle, and the volume and weight of the second magnet 9 are required to be as small as possible to meet higher lightweight requirements. Therefore, in order to further reduce the volume and weight of the second magnet 9, the present invention arranges the third magnet 8 to the inner side of the first magnet 7, and connects and couples the third magnet 8 with the second magnet 9.

[0061] The first coil 6 is fixed, and the second magnet 9 is used to determine the position of the mobile device after it stops. The position may be random, so the first magnet 7 and the third magnet 8 are moved in XYZ (the corresponding specific direction is as follows Figure 3 The two couplers move in three directions (as shown), ultimately achieving coupling between the two couplers.

[0062] The embodiment 1 is appropriately deformed, each magnet part includes 3 magnets, and the multiple magnets are slidably connected and can slide up and down relative to each other, so as to increase the height of the third magnet 8 in the vertical direction, and the embodiment 2 is obtained, and its structure is as follows: Figure 4 , Figure 5 , Figure 6 , Figure 7 shown.

[0063] In Example 2, in the X direction, the third magnet 8 and the second magnet 9 are butted against each other. Since the width of the third magnet 8 in the X direction is reduced (the third magnet 8 is arranged to the inner side of the first magnet 7), the length of the second magnet 9 in the X direction is also reduced, thereby reducing the volume and weight of the second magnet 9. In addition, another beneficial effect is that there is a preset distance between the third magnet 8 and the surface of the recessed part of the first magnet 7, and the preset distance is used to set the first coil 6. When the second magnet 9 is offset to the left relative to the first magnet 7 in the X direction, after the third magnet 8 is raised, the preset distance below the third magnet 8 can be used to adapt the first coil 6, such as Figure 5 , Figure 6 , Figure 7 As shown, therefore, this solution can further expand the offset docking capability in the X direction.

[0064] In the vertical direction Z, by adjusting the height of each magnet in the third magnet 8, the upper part of the third magnet 8 is close to the lower part of the second magnet 9, as shown in FIG. Figure 6 and Figure 7 shown.

[0065] The cross-sectional area of ​​the third magnet 8 (here refers to the topmost magnet after each magnet therein has slid) is enlarged relative to the cross-sectional area of ​​the first magnet 7. When the second magnet 9 is rotationally offset relative to the first magnet 7, as long as the second magnet 9 is partially aligned with the upper part of the third magnet 8, it can have an overlapping cross-sectional area similar to that of the first magnet 7. Therefore, a beneficial effect can be obtained: the anti-displacement ability in the rotation direction between the first magnet 7 and the second magnet 9 is improved.

[0066] In order to further reduce the volume and weight of the first magnet 7, the first magnet 7 and the third magnet 8 are hinged, such as Figure 8 As shown, Example 3 is obtained; wherein, the third magnet 8 includes two magnet parts, the two magnet parts are respectively hinged on the left and right sides of the first magnet 7, the magnet part includes a plurality of magnets, and the plurality of magnets are telescopically connected in sequence to reduce the distance between the upper part of the third magnet 8 and the lower part of the second magnet 9.

[0067] In Example 3, when the second magnet 9 is facing the first magnet 7, the third magnet 8 is in a vertical state. When the second magnet 9 is offset to the left side of the first magnet 7, as shown in FIG. Fig. 9 As shown, rotate the third magnet 8, and move the rear one / two of the third magnet 8 (corresponding to Fig. 9 and Fig.10 The third magnet 8 is extended so that the upper part of the third magnet 8 is close to the lower part of the second magnet 9, thereby forming a closed magnetic circuit with a small air gap formed by the first magnet 7, the second magnet 9 and the third magnet 8.

[0068] In order to further reduce the volume and weight of the first magnet 7, the third magnet 8 is configured to include three components, namely a first component 401, a second component 402 and a third component 403. Fig.11 As shown, the first component 401 of the first magnet 7 and the third magnet 8 is hinged, the first component 401 and the second component 402 are slidably telescopically connected, the second component 402 and the third component 403 are hinged, and the third component 403 and the second magnet 9 are hinged, thereby obtaining Example 4.

[0069] In Embodiment 4, the two left and right third components 403 may be hinged to both ends of the first bracket 11 , further limiting the distance between the upper ends of the two third components 403 .

[0070] After making the improvement of Example 4, the beneficial effect is that the first magnet 7 does not need to be moved and can be fixed, and only the third magnet 8 needs to be moved to meet the offset docking in the X and Z directions. Fig.12 As shown, when there is an offset in the X and Z directions, the docking requirements can be met by adjusting the components of the third magnet 8 .

[0071] The present invention also designs Fig.13The three-axis moving mechanism shown includes a third electric push rod 101, a first support arm 102, a second support arm 103, a first crossbeam 104, a third rail 105, a second electric push rod 201, a first rail 202, a first slider 203, a second rail 204, a first electric push rod 301, a second slider 302, a guide rod 303, a spring 404, a second slider 601 and a second support 602.

[0072] In the three-axis moving mechanism, the three electric push rods can also be replaced by motor screws. The first electric push rod 301 drives the movement in the X direction, the second electric push rod 201 drives the movement in the Y direction, and the third electric push rod 101 drives the movement in the Z direction; the first electric push rod 301 drives the guide rod 303, and the guide rod 303 drives the first magnet 7 to move in the X direction; the third electric push rod 101 drives the X-shaped bracket composed of the first bracket arm 102 and the second bracket arm 103 to lift the frame composed of the first crossbeam 104 and the third track 105, and further drives the third component 403 to lift through the second slider 601 and the second bracket 602. At the same time, the first component 401 and the second component 402 are connected by the spring 404, and the third component 403 and the second component 402 are connected by the second spring. During the lifting process, the lower parts of the second component 402 and the first component 401 are suspended, so as to facilitate the wide range movement of the first magnet 7 in the X direction without interfering with the first coil 6.

[0073] In the present invention, the energy source 1 can be a power grid, an energy storage load, etc., which is used to provide an electric power source. The power conversion device 2 is used to convert the input AC or DC power into high-frequency AC power, including an inverter and a resonant network, which resonates with the coupler. The coupler may include a coil that transmits energy based on the principle of electromagnetic induction, or a capacitor plate that transmits energy based on the principle of electric field, and also includes a magnet with high magnetic permeability. The magnet may be ferrite, nanocrystal or other high magnetic permeability magnet.

[0074] like Fig.14 As shown, in the technical solution in Example 5, 6 power sources are included, namely the first to sixth electric push rods, wherein the first electric push rod 301 and the fourth electric push rod move synchronously to form a group, the second electric push rod 201 and the fifth electric push rod move synchronously to form a group, and the third electric push rod 101 and the sixth electric push rod move synchronously to form a group, a total of three groups of power sources, which respectively drive the third magnet to move in the three directions of X, Y and Z.

[0075] The third magnet 8 is slidably connected to the first magnet 7 . The first magnet 7 has a function of moving in the XY directions, and the third magnet 8 has a function of moving in the Z direction relative to the first magnet 7 .

[0076] The first magnet 7 is fixed to the magnet bracket 809, the bracket X (guide rod 303) and the magnet bracket 809 are slidably connected (sliding in the Y direction), the fixed ends of the first electric push rod 301 and the fourth electric push rod are connected to the base 719, and the movable ends of the first electric push rod 301 and the fourth electric push rod are fixedly connected to the guide rod 303, and push the guide rod 303 and the magnet bracket 809 to move in the X direction.

[0077] like Fig.15 As shown, the magnet bracket 809 is slidably connected to the fourth bracket 703 (sliding in the X direction), the fixed ends of the second electric push rod 201 and the fifth electric push rod are connected to the base 719, and the movable ends of the second electric push rod 201 and the fifth electric push rod are fixedly connected to the fourth bracket 703, and push the fourth bracket 703 to move the magnet bracket 809 in the Y direction.

[0078] The third magnet 8 is lifted and lowered in the Z direction. The third electric push rod 101 and the sixth electric push rod drive the first left X lifting bracket formed by the first left bracket wall 705 and the second left bracket wall 706 and the first left X lifting bracket formed by the first right bracket wall 707 and the second right bracket wall 708, thereby driving the fifth bracket 704 connected to the two lifting brackets to move in the Z direction. The fifth bracket 704 is a rectangular frame. The third bracket 702 with two third brackets set at a certain distance is also installed on the fifth bracket 704. The third bracket 702 and the fifth bracket 704 are slidably connected (sliding in the Y direction). A first bracket 701 is also provided that is slidably connected to the third bracket 702 (sliding in the X direction). The first bracket 701 and the third magnet 8 are fixedly connected, so the third magnet 8 can move in three directions of XYZ at the same time, wherein the movement in the XY direction is driven by the first magnet 7, and the movement in the Z direction is driven by the first bracket 701 and the third bracket 702 through the two lifting brackets.

[0079] If the third magnet 8 includes multiple components, the first bracket 701 and the top component of the third magnet 8 are fixedly connected, the components of the third magnet 8 are slidably connected to each other, and springs are connected to each other. The other components except the top component are lifted and lowered in the Z direction by the top component and the spring, and are moved in the XY direction by the first magnet 7.

[0080] like Fig.16 and Fig.17 As shown, the technical solution of Example 6 includes three power sources, which respectively drive the third magnet 8 to move in the three directions of X, Y and Z.

[0081] The third magnet 8 is slidably connected to the first magnet 7 . The first magnet 7 has a function of moving in the XY directions. The third magnet 8 has a function of moving in the Z direction relative to the first magnet 7 .

[0082] The first magnet 7 is fixed to the magnet bracket 809, the guide rod 303 is slidably connected to the magnet bracket 809 (sliding in the Y direction), and the first motor 801 drives the X-direction moving mechanism to move the guide rod 303 and the magnet bracket 809 in the X direction, while the Y-direction position remains unchanged. The X-direction moving mechanism is connected by the fourth screw rod 802, the fifth bevel gear 806, the sixth bevel gear 806, the seventh bevel gear 807, the seventh screw rod 810, and the fifth screw rod 803.

[0083] The guide rod 303 is slidably connected to the base 719 (slides in the X direction) and bears gravity, and the guide rod 303 does not move in the Y direction.

[0084] The magnet bracket 809 is slidably connected to the fourth bracket 703 (sliding in the X direction), and the second motor moves the fourth bracket 703 in the Y direction through the Y-direction moving mechanism, thereby moving the magnet bracket 809 and the first magnet 7 in the Y direction without affecting the position in the X direction. The fourth bracket 703 does not move in the X direction.

[0085] The Y-axis moving mechanism is formed by connecting the eighth screw rod, the fourth bevel gear 715 , the eighth bevel gear 808 , the first screw rod 709 , and the sixth screw rod 804 .

[0086] The third magnet 8 is lifted and lowered in the Z direction, and the third motor 718 drives the lifting mechanism to move in the Z direction through the Z-direction moving mechanism. A third bracket 702 is installed on the lifting bracket, which is slidably connected to it (sliding in the Y direction). The third bracket 702 is slidably connected to the first bracket 701 (sliding in the X direction), and the first bracket 701 is fixedly connected to the third magnet 8. Therefore, the third magnet 8 can move in three directions of XYZ at the same time, among which the movement in the XY direction is driven by the first magnet 7, and the movement in the Z direction is driven by the first bracket 701 and the third bracket 702 through the lifting bracket.

[0087] If the third magnet 8 includes multiple components, the first bracket 701 and the top component of the third magnet 8 are fixedly connected, the components of the third magnet 8 are slidably connected to each other, and springs are connected to each other. The other components except the top component are lifted and lowered in the Z direction by the top component and the spring, and are moved in the XY direction by the first magnet 7.

[0088] The Z-axis moving mechanism is formed by connecting a transmission rod 717 , a first bevel gear 712 , a second bevel gear 713 , a second screw rod 710 , a third screw rod 711 , a third slider 716 , and a fourth slider.

[0089] The second screw rod 710 is the rotating shaft of the third motor, the third slider 716 is hinged to the first left support arm 705 of the lifting bracket, the second screw rod 710 drives one end of the first left support arm 705 to move through the third slider 716, the other end of the first left support arm 705 is hinged to the first cross beam 104, a certain preset position in the middle of the first left support arm 705 is hinged to a certain preset position in the middle of the second left support arm 706, one end of the second left support arm 706 is hinged to the base, the other end of the second left support arm 706 is slidingly hinged to the first measure 104, the first cross beam, the second cross beam, the third rail 105 and the fourth rail are fixed to form the fifth bracket 704.

[0090] Fig.14 The first electric push rod 301 and the fourth electric push rod are equivalent to the first motor, the second electric push rod 201 and the fifth electric push rod are equivalent to the second motor, and the third electric push rod 101 and the sixth electric push rod are equivalent to the third motor, forming the following Fig.18 System block diagram of the three-motor embodiment shown.

[0091] like Fig.19 As shown, the wireless charging system is divided into a power supply end and a receiving end. The power is provided by the power supply to enter the first power conversion device, and then transmitted to the first magnet and the third magnet through the first coil. The power is transmitted to the second magnet through the coupling effect of the third magnet and the second magnet, and then transmitted to the second power conversion device through the second coil to charge the battery. The first controller controls the first motor, the second motor, and the third motor to realize the three-axis moving mechanism, control the movement of the third magnet in the three directions of XYZ, and dock the third magnet with the second magnet.

[0092] The first power conversion device may be a full-bridge H-bridge circuit including four switch tubes, which works as an inverter when transmitting power in the forward direction and as a rectifier when transmitting power in the reverse direction. The first controller may be a microprocessor, such as TMS320F28335, and the positioning device may be a single camera; or it may include two separate components, namely a signal transmitter and a signal receiver. For example, an ultrasonic sensor, in which the signal transmitter generates ultrasonic waves, and the signal receiver captures the ultrasonic waves, and uses them to calculate the distance between the two.

[0093] like Fig. 20 As shown, Embodiment 7 of the present invention provides a control method for a wireless charging system, comprising the following steps:

[0094] S1, detecting that the vehicle (installed with the second coupler) parks in the parking space (installed with the first coupler);

[0095] S2, the positioning device detects the spatial position of the second magnet in the second coupler and transmits it to the controller;

[0096] S3, the controller calculates the distance that the XYZ three axes need to move according to the obtained spatial position of the second magnet;

[0097] S4, the controller drives the motor in the three-axis moving mechanism, uses the three-axis moving mechanism to transmit to the third magnet, and finally moves the third magnet so that the first magnet, the second magnet and the third magnet form a magnetic circuit that meets the preset conditions;

[0098] S5, the positioning device detects the relative distance between the second magnet and the third magnet;

[0099] S6, judging whether the second magnet and the third magnet are aligned according to the detected relative distance, if not, returning to step S2, if aligned, proceeding to step S7;

[0100] S7, checking whether the charging conditions are met and waiting for charging and discharging instructions;

[0101] S8. If the charging conditions are met, according to the received charging instruction, the power conversion device connected to the power source is set as an inverter, and the power conversion device connected to the battery is set as a rectifier to start charging; according to the received discharging instruction, the power conversion device connected to the power source is set as a rectifier, and the power conversion device connected to the battery is set as an inverter to start discharging.

[0102] like Fig.21 As shown, in the wireless charging system provided by Embodiment 8 of the present invention, the first magnet, the second magnet and the third magnet are magnetic conductive materials with a relative magnetic permeability greater than 100, such as manganese zinc ferrite, amorphous and nanocrystalline.

[0103] The magnetic conductive material includes several layers of strips connected in sequence, and the outer surface of the strips is divided into a flux surface and a non-flux surface. When the flux surfaces of two strips are connected / aligned, the magnetic circuit can be connected. The third magnet and the first magnet are connected through the flux surface of the strip, and the part where the third magnet and the second magnet are aligned is the flux surface of the strip, so as to form a magnetic circuit whose magnetic resistance meets the preset requirements.

[0104] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A wireless charging system, characterized in that: include: A power supply module and a receiving module, the power supply module includes a first coupler, the receiving module includes a second coupler, the first coupler and the second coupler are coupled to each other; the first coupler includes a first coil, a first magnet and a third magnet; the second coupler includes a second coil and a second magnet; the first coil is wound around the first magnet; the second coil is wound around the second magnet; the third magnet is connected to the inner side of the first magnet, and is used to reduce the vertical gap between the first magnet and the second magnet, so that a closed magnetic circuit that meets preset requirements is formed between the first coupler and the second coupler.

2. The wireless charging system according to claim 1, characterized in that: A judgment condition for forming a closed magnetic circuit that meets preset requirements between the first coupler and the second coupler is that the coupling coefficient between the first coil and the second coil is greater than a set value.

3. The wireless charging system according to claim 1, characterized in that: The third magnet includes two magnet parts, and the two magnet parts are respectively arranged on the inner sides of the left and right sides of the first magnet, so that the third magnet fills the gap between the first magnet and the second magnet in the vertical direction.

4. The wireless charging system according to claim 1, characterized in that: The first magnet, the second magnet and the third magnet are magnetic conductive materials with a relative magnetic permeability greater than 100, and the magnetic conductive materials include manganese zinc ferrite, amorphous and nanocrystalline.

5. The wireless charging system according to claim 4, characterized in that: The magnetic conductive material comprises several layers of strips connected in sequence, the outer surface of the strips is divided into a flux surface and a non-flux surface, and when the flux surfaces of two strips are connected / aligned, the magnetic circuit can be connected, the third magnet and the first magnet are connected through the flux surface of the strip, and the part where the third magnet and the second magnet are aligned is the flux surface of the strip, so as to form a magnetic circuit whose magnetic resistance meets the preset requirements.

6. The wireless charging system according to claim 1, characterized in that: In the third magnet, a cross-sectional area of ​​a portion aligned with the second magnet is larger than a cross-sectional area of ​​a non-aligned portion.

7. The wireless charging system according to claim 1, characterized in that: The third magnet is arranged inside the left and right edges of the first magnet, and there is a preset distance between the third magnet and the surface of the recessed portion of the first magnet, and the preset distance is used to set the first coil; When the third magnet rises, the space released by the preset distance enables the first magnet and the third magnet to have space to move without interfering with the first coil.

8. The wireless charging system according to claim 3, characterized in that: The magnet part includes a plurality of magnets, and the plurality of magnets are slidably connected to each other so as to increase the height of the third magnet in the vertical direction.

9. The wireless charging system according to claim 1, characterized in that: The third magnet is hinged to the first magnet, and the third magnet includes two magnet parts, and the two magnet parts are hinged to the left and right sides of the first magnet respectively.

10. The wireless charging system according to claim 9, characterized in that: The magnet part includes a plurality of magnets, and the plurality of magnets are telescopically connected in sequence, so that the distance between the upper part of the third magnet and the lower part of the second magnet is reduced.

11. The wireless charging system according to claim 9, characterized in that: The magnet part comprises a first component, a second component and a third component, the first component is hinged to the first magnet, the second component is telescopically connected to the first component, and the third component is hinged to the second component.

12. The wireless charging system according to claim 11, characterized in that: The third components of the two magnet parts are respectively hinged to the two ends of the first bracket.

13. The wireless charging system according to claim 1, characterized in that: The system also includes a controller and a three-axis moving mechanism. The controller controls the three-axis moving mechanism to realize the movement of the third magnet in three directions: X, Y and Z. The X direction is a direction in a horizontal plane perpendicular to the vehicle where the second coupler is located, the Y direction is perpendicular to the X direction, and the Z direction is a vertical direction.

14. The wireless charging system according to claim 10, characterized in that: The three-axis moving mechanism includes a first motor, a second motor and a third motor, and also includes an X-direction moving mechanism, a Y-direction moving mechanism and a Z-direction moving mechanism; The first magnet is connected to the X-direction moving mechanism and the Y-direction moving mechanism respectively, the controller controls the first motor to operate, thereby driving the X-direction moving mechanism to drive the first magnet to move in the X direction, thereby driving the third magnet to move in the X direction, and the controller controls the second motor to operate, thereby driving the Y-direction moving mechanism to drive the first magnet to move in the Y direction, thereby driving the third magnet to move in the Y direction; The third magnet is connected to the Z-direction moving mechanism, and the controller controls the third motor to operate, thereby driving the Z-direction moving mechanism to drive the third magnet to move in the Z direction.

15. The control method of the system according to any one of claims 1 to 11, characterized in that: include: S1. When the vehicle equipped with the second coupler parks at the parking space equipped with the first coupler, proceed to step S2; S2, the positioning device detects the spatial position of the second magnet in the second coupler and transmits it to the controller; S3, the controller calculates the distances that the X, Y and Z axes need to move according to the obtained spatial position of the second magnet; S4, the controller drives each motor in the three-axis moving mechanism, uses the three-axis moving mechanism to transmit to the third magnet, and finally moves the third magnet so that the first magnet, the second magnet and the third magnet form a magnetic circuit that meets the preset conditions; S5, the positioning device detects the relative distance between the second magnet and the third magnet; S6, judging whether the second magnet and the third magnet are aligned according to the detected relative distance, if not, returning to step S2, if aligned, proceeding to step S7; S7, checking whether the charging conditions are met and waiting for charging and discharging instructions; S8. If the charging conditions are met, according to the received charging instruction, the power conversion device connected to the power source is set as an inverter, and the power conversion device connected to the battery is set as a rectifier to start charging; according to the received discharging instruction, the power conversion device connected to the power source is set as a rectifier, and the power conversion device connected to the battery is set as an inverter to start discharging.

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