Wireless charging system

Abstract

A wireless charging system includes a wireless charger and a wireless charging remote device. The wireless charger includes a transmit coil configured to wirelessly transmit power and including a plurality of windings wound in a spiral shape, wherein at least one turn of the plurality of windings includes at least one bend to form an accommodation space; a power conversion circuit configured to supply power to the transmit coil; and at least one mechanical support disposed in the accommodation space and configured to withstand a high mechanical load.

Description

[0001] Cross-referencing

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 728,414, filed December 5, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a wireless charging system, and more particularly to an overall design for the wireless charging system that takes into account mechanical support and electrical parameters. Background Technology

[0004] Wireless power transfer (WPT) has become a key technology in modern charging systems. With continuously increasing charging power levels, WPT offers significant advantages to various electronic devices by eliminating the need for cables. A typical application of WPT is in electric vehicles, where magnetically coupled coils can be mounted on the ground surface. This mounting method is particularly advantageous in densely populated areas due to its seamless integration with parking lots.

[0005] It should be noted that the information disclosed in the background section above is provided only to better understand the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] This disclosure provides a wireless charger, a wireless charging remote device, and a method for charging the wireless charging remote device using the wireless charger.

[0007] The first aspect of this disclosure relates to a wireless charger, comprising:

[0008] The transmitting coil is configured to transmit power wirelessly and includes a plurality of windings wound in a helical shape, wherein at least one turn of the plurality of windings includes at least one bend to form a receiving space.

[0009] The power conversion circuit is configured to supply power to the transmitting coil; and

[0010] At least one mechanical support is disposed in the receiving space and configured to withstand high mechanical loads.

[0011] According to embodiments of this disclosure, each turn of the plurality of windings is wound into at least one of a circle or a polygon.

[0012] According to an embodiment of the present disclosure, at least one bend is disposed at any one of the second innermost to outermost turns of the transmitting coil, and the bend bends along a direction away from the inner side of at least one turn of the plurality of windings.

[0013] According to embodiments of this disclosure, when the windings are circular, at least one turn of a plurality of windings includes a plurality of bends evenly spaced along the circle; and

[0014] In the case where the winding is polygonal, at least one turn of the plurality of windings includes a bend disposed on each side of the polygon.

[0015] According to an embodiment of this disclosure, when the winding is rectangular, a receiving space is also formed at each corner of the rectangle.

[0016] According to embodiments of the present disclosure, each turn of a plurality of windings is configured to have the same turn pitch except at bends where the turn pitch is reduced.

[0017] According to embodiments of this disclosure, the mechanical support is formed of a non-conductive and non-magnetic material.

[0018] According to embodiments of this disclosure, the power conversion circuit includes an LCC-S compensation network configured to maintain a constant voltage output under a wide range of load conditions.

[0019] According to embodiments of the present disclosure, the power conversion circuit includes a buck converter configured to mitigate voltage spikes and maintain a stable voltage under open-circuit or high-load conditions.

[0020] According to embodiments of this disclosure, the wireless charger is embedded below the floor surface or surface-mounted on the floor surface.

[0021] According to embodiments of this disclosure, the wireless charger is configured to be installed in a public transportation station or inside a vehicle.

[0022] The second aspect of this disclosure relates to a wireless charging remote device, comprising:

[0023] main body;

[0024] A receiving coil, disposed on the underside of the main body, is configured to receive power wirelessly and includes a plurality of windings wound in a helical shape, wherein at least one turn of the plurality of windings includes at least one bend to form a receiving space.

[0025] A power conversion circuit is configured to convert power received from a receiving coil into power for a battery management system of a wireless charging remote device; and

[0026] At least one mechanical connector is disposed in the receiving space and configured to connect the receiving coil to the body.

[0027] According to embodiments of this disclosure, each turn of the plurality of windings is wound into at least one of a circle or a polygon.

[0028] According to an embodiment of the present disclosure, at least one bend is disposed at any one of the second innermost to outermost turns of the transmitting coil, and the bend bends along a direction away from the inner side of at least one turn of the plurality of windings.

[0029] According to embodiments of this disclosure, when the windings are circular, at least one turn of a plurality of windings includes a plurality of bends evenly spaced along the circle; and

[0030] In the case where the winding is polygonal, at least one turn of the plurality of windings includes a bend disposed on each side of the polygon.

[0031] According to an embodiment of this disclosure, when the winding is rectangular, a receiving space is also formed at each corner of the rectangle.

[0032] According to embodiments of the present disclosure, each turn of a plurality of windings is configured to have the same turn pitch except at bends where the turn pitch decreases.

[0033] According to embodiments of this disclosure, the power conversion circuit includes a closed-loop system comprising a sensor and a controller configured to maintain a constant voltage range and ensure stable operation over a wide range of load conditions.

[0034] A third aspect of this disclosure relates to a method for wirelessly charging a wireless charging remote device using a wireless charger according to the first aspect, comprising:

[0035] Position the wireless charging remote device above the transmitting coil of the wireless charger; and

[0036] Activate the power conversion circuitry of the wireless charger and the wireless charging remote device to initiate power transmission; and

[0037] The power conversion circuitry of the wireless charger and the wireless charging remote device are used to monitor and adjust power transmission.

[0038] According to embodiments of this disclosure, the method further includes performing periodic stress and thermal management analysis to ensure the integrity of the mechanical support and effective heat dissipation.

[0039] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0040] The accompanying drawings provide illustrations to further illustrate and clarify the foregoing and additional aspects, advantages, and features of this disclosure. It should be understood that these drawings illustrate only specific embodiments of this disclosure and are not intended to limit its scope. Furthermore, these drawings are presented for simplicity and clarity and may not be drawn to scale. This disclosure will now be described and explained in more specific and detailed manner using the accompanying drawings, in which:

[0041] Figure 1 An embodiment of the present disclosure is shown, including a transmitter (L) P ) and receiver (L S Wireless power transmission system;

[0042] Figure 2 It shows Figure 1 A detailed circuit diagram of a wireless power transmission system with a series-series (SS) compensation network;

[0043] Figure 3 A detailed circuit diagram of a wireless power transmission system having an inductor-capacitor-capacitor series (LCC-S) compensation network according to an embodiment of the present disclosure is shown.

[0044] Figure 4 A wireless charging system having a circular N-turn induction coil structure for both the transmitter and receiver is shown according to an embodiment of the present disclosure;

[0045] Figure 5 A wireless charging system having a rectangular N-turn induction coil structure for both the transmitter and receiver is shown according to an embodiment of the present disclosure;

[0046] Figure 6 A wireless charging system having a hexagonal N-turn induction coil structure for both the transmitter and receiver is shown according to an embodiment of the present disclosure;

[0047] Figure 7 A schematic block diagram of a wireless charging system according to an embodiment of the present disclosure is shown;

[0048] Figure 8 A schematic diagram of a wireless charging system according to an embodiment of the present disclosure is shown;

[0049] Figure 9 A schematic diagram of a wireless charger surface-mounted on the ground is shown; and

[0050] Figure 10 A schematic block diagram of a wireless charging system including chargers deployed at different locations, according to an embodiment of the present disclosure, is shown. Detailed Implementation

[0051] The following detailed description is provided only as exemplary embodiments and is not intended to limit the scope of the disclosure or its application and use. It should be understood that various variations are possible. This detailed description will enable those skilled in the art to implement exemplary embodiments of this disclosure without extensive experimentation. Furthermore, it should be understood that various changes or modifications can be made to the functions and structures described in the exemplary embodiments without departing from the scope of this disclosure as defined by the appended claims.

[0052] Benefits, advantages, solutions to problems, and any elements that may provide or enhance these benefits, advantages, or solutions should not be construed as key, essential, or necessary features or elements of any or all claims. The invention is defined solely by the appended claims (including any modifications made during the pending period of this application and all equivalents of these published claims).

[0053] In the context of describing this invention (especially in the context of the following claims), the terms “a,” “the,” “at least one,” and similar designations should be interpreted to cover both singular and plural forms, unless otherwise stated herein or the context clearly contradicts it. The terms “comprising,” “having,” and “including,” or any other variations thereof, should be interpreted as open-ended terms (i.e., meaning “including but not limited to”). Unless otherwise stated, the use of any and all example or exemplary language provided herein (e.g., “such as”) is intended only to better illustrate the invention and does not constitute a limitation on the scope of the invention. No language in the specification should be construed as indicating that any unstated element is essential to the practice of the invention. Furthermore, unless explicitly stated otherwise, “or” means inclusive “or,” not exclusive “or.” For example, condition A or B satisfies any of the following: A is true and B is false, A is false and B is true, and both A and B are true. Approximate terms (e.g., “about,” “substantially,” “approximately,” and “truly”) include values ​​within 10% greater or less than the stated value.

[0054] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of this invention shall have the same meaning as commonly understood by one of ordinary skill in the art.

[0055] As used herein, the terms “transmitter,” “receiver,” “primary,” and “secondary” refer to the transfer of electrical energy from a transmitting device to a receiving device. However, it should be noted that energy transfer may sometimes occur in reverse. For example, a small amount of energy may be transferred in reverse to improve the alignment of the transmitter and receiver or to achieve other communication purposes. In this case, the “transmitter” may be configured to receive energy, and the “receiver” may be configured to transmit energy.

[0056] The term "wireless charging" or similar expression refers to the transfer of any form of energy associated with an electric field, magnetic field, electromagnetic field, or other mechanism from a transmitter to a receiver without the use of a physical electrical conductor. Power output to a wireless field (e.g., a magnetic field) can be received, captured, or coupled through an induction coil at the receiver to facilitate power transfer. It should be understood that the term "coupling" can refer to an interaction that occurs directly or indirectly, and can represent coupling with a physical connection (e.g., wired) or coupling with a physical disconnect (e.g., wireless).

[0057] The described structure can have any suitable components or characteristics that allow it to wirelessly charge while taking into account the mechanical support of the electric mobility scooter. To achieve this, a dedicated magnetic coil is designed to provide sufficient mechanical support and electromagnetic coupling for the electric mobility scooter. In a preferred application, the structure is used to charge an electric mobility scooter. In other alternative embodiments, the structure can have any suitable design that allows it to charge additional battery packs in other electric devices that require sufficient mechanical support (e.g., electric vehicles, automated guided vehicles, etc.).

[0058] Among various types of electric vehicles, electric mobility scooters particularly benefit from wireless charging technology. Wireless power transfer (WPT) offers enormous potential for charging electric mobility scooters due to the unique needs of their users. Many electric mobility scooter users face challenges when manually connecting chargers (e.g., reaching for the charger, managing cables, or handling the weight of conventional charging equipment). These tasks are especially difficult for users with limited hand dexterity or strength.

[0059] Therefore, many electric mobility scooter users require assistance from caregivers to plug in the charger. Implementing a wireless charging system for electric mobility scooters would provide a more convenient and user-friendly solution. This technology would not only enhance individual mobility by providing a long-lasting power source but also reduce the need for caregiver assistance, thereby promoting greater user independence and facilitating more autonomous outdoor activities.

[0060] However, the design of mechanical support components for such systems is often inadequate. Conventional methods typically involve enclosing the magnetically coupled coil within a box-like structure. While this approach is suitable for lightweight devices such as smartphones and laptops, it is not well-suited for heavier electric vehicles, including electric mobility scooters. In these cases, misalignment issues and the inability to handle high mechanical loads become apparent. Therefore, there is an urgent need for robust mechanical support systems specifically tailored for wireless charging of heavy electric mobility scooters.

[0061] Embodiments of this disclosure propose a novel overall design approach for wireless power transmission systems that integrates mechanical supports with electrical parameters, particularly for charging electric mobility scooters.

[0062] In addition, mechanical stress and accidental contact issues have been specifically considered. Traditional support mechanisms are insufficient to handle these scenarios, thus requiring a thin yet robust mechanical structure.

[0063] This invention addresses these challenges by introducing a specialized magnetic coil design to create space for a mechanical support system that not only protects the magnetically coupled structure but also ensures the durability and performance of the wireless charging process.

[0064] This design incorporates integrated mechanics and coil structures, optimizing the entire system for high-performance wireless charging. This new system is ideal for environments requiring additional wireless chargers (e.g., subway stations and train interiors).

[0065] In particular, this disclosure relates to systems and methods with specially designed mechanical supports and coil structures for wirelessly transmitting power to electric mobility scooters in subway stations or trains. In other words, this invention belongs to the field of wireless power transmission systems, with a particular focus on the design of mechanical supports and electrical parameters. This invention is primarily applied to charging electric mobility scooters, a key area for supporting those in need. The technology aims to provide an efficient, reliable, and convenient wireless charging solution for electric mobility scooters.

[0066] Figure 1 An embodiment of the present disclosure is shown, including a transmitter (L) P ) and receiver (L S ) wireless power transmission system; and Figure 2 It shows Figure 1 A detailed circuit diagram of a wireless power transmission system with a series-to-series (SS) compensation network.

[0067] like Figure 1 As shown, the wireless power transmission system includes a transmitter (L... P ) and receiver (L S Transmitter (L) P The transmitter (L) can be included in a wireless charger. P The wireless charger includes a receiver (L) S Wireless power transfer is performed between the charging objects of the transmitter (L). P ) and receiver (L S Each of the following includes a coil comprising multiple windings wound in a helical shape. The accompanying drawings show four turns in each coil, indicated by windings #1 through #4. It should be noted that the number of turns in the windings is not limited in this disclosure.

[0068] like Figure 1 and Figure 2As shown, the transmitter (L) P The receiver (L) is configured to transmit wireless power, while the receiver (L) is configured to transmit wireless power. S The transmitter (L) is configured to receive wireless power. Specifically, the transmitter (L) P ) receives power from the power conversion circuit and transmits it through the transmitter (L P ) and receiver (L S The mutual inductance between the two components transmits power wirelessly to the receiver (L). S ). Receiver (L) S The received power can be transmitted to the power conversion circuit to charge the battery through the battery management system (BMS).

[0069] More specifically, the charger's power conversion circuit converts the power from the external power supply Vdc into primary power Up, and supplies the primary power Up to the transmitter (L). P Then the primary power Up passes through the transmitter (L). P ) and receiver (L S Mutual inductance between the receiver (L) is transmitted to the receiver. S The received secondary power Us is then supplied to the receiver's power conversion circuit, and subsequently converted by the battery management system (BMS) into the voltage Ub required to charge the battery.

[0070] Furthermore, such as Figure 2 As shown, this embodiment includes a series-in-series (SS) compensation network. In this SS compensation network, the transmitter side includes a primary capacitor Cp and a primary inductor Lp connected in series, while the receiver side includes a secondary capacitor Cs and a secondary inductor Ls connected in series.

[0071] Figure 3 A detailed circuit diagram of a wireless power transmission system having an inductor-capacitor-capacitor series (LCC-S) compensation network according to an embodiment of the present disclosure is shown.

[0072] like Figure 3 As shown, this embodiment includes an inductor-capacitor-capacitor series (LCC-S) compensation network to maintain a constant voltage output under a wide range of load conditions. In the LCC-S compensation network, the transmitter side includes a filter inductor Lft connected in series with the primary capacitor Cp and the primary inductor Lp, and a capacitor C connected in parallel between the filter inductor Lft and the primary inductor Lp. T In addition, the receiver side includes a secondary capacitor Cs and a secondary inductor Ls connected in series.

[0073] An inductor-capacitor series (LCC-S) compensation topology is employed to achieve a relatively constant voltage (CV) output. This network significantly reduces the design complexity of the battery management system (BMS) by maintaining a stable input voltage, which is crucial for efficient battery charging and load management. The compensation network is designed to handle various load variations, thereby ensuring stable operation under different charging conditions.

[0074] Figure 3 A detailed circuit diagram is shown. Since most of the higher harmonics are trapped in the resonant circuit, this paper only considers the fundamental component to simplify the analysis.

[0075]

[0076] in:

[0077] V dc It is the DC input voltage of the H-bridge inverter on the primary side (basic equipment, such as a wireless charger);

[0078] U P It is the AC output voltage of the H-bridge inverter on the primary side (basic equipment);

[0079] After the LCC-S compensation network and ignoring parasitic resistance R T R P and R S Then, the output voltage on the battery at the remote device can be expressed as

[0080]

[0081] in:

[0082] U B It is the output voltage on the battery of the secondary side (remote devices, such as electric mobility scooters);

[0083] R T It is the parasitic resistance of the compensation inductor (Lft) on the primary side (basic equipment);

[0084] R P It is the parasitic resistance of the transmitting coil (LP) on the primary side (basic equipment);

[0085] R S It is the parasitic resistance of the receiving coil (LP) on the secondary side (remote device);

[0086] The LCC-S compensation network is analyzed in detail, highlighting its role in maintaining a constant voltage output. Design considerations for the compensation network, including the selection of inductor and capacitor values, are discussed to achieve optimal performance.

[0087] Furthermore, a closed-loop system is integrated into the load side to regulate the output voltage. The load-side closed-loop system includes sensors and a controller to maintain a constant voltage range of 12-24V or 24-50V, thereby ensuring stable operation over a wide range of load conditions. The design and testing of the closed-loop system are described, demonstrating its effectiveness in maintaining voltage stability under a wide range of load conditions.

[0088] like Figure 3 As shown, the receiver's output power (i.e., voltage Us) is input to a rectifier to convert voltage Us into a DC voltage suitable for charging the battery. The rectifier's output is connected to a buck converter configured to mitigate voltage spikes and maintain a stable voltage under open-circuit or high-load conditions. In this embodiment, the buck converter is designed to regulate the output voltage by adjusting to varying load conditions without requiring communication between the transmitter and receiver sides, thus ensuring reliable operation.

[0089] Figure 4 A wireless charging system having a circular N-turn induction coil structure for both the transmitter and receiver is shown according to an embodiment of the present disclosure. Figure 4 As shown, one embodiment of this disclosure provides a first wireless charging system 100 having a circular N-turn induction coil structure. Specifically, the first wireless charging system 110 includes a circular transmitting coil and a circular receiver 120, the circular transmitting coil having space for mechanical support to withstand sufficient stress from an electric mobility scooter, and the circular receiver 120 having space for mechanical support for connecting the receiving coil to a remote device (e.g., an electric mobility scooter).

[0090] Specifically, refer to Figure 4 The wireless charging system includes a wireless charger that includes a transmitting coil, or transmitter (Lp). The transmitting coil is configured to transmit power wirelessly and includes multiple windings (111-113) wound in a helical shape, wherein at least one turn of the multiple windings includes at least one bend to form a receiving space. Figure 4 As shown, the transmitting coil includes an N-turn winding, and the second innermost winding (winding #2) has six bends, and correspondingly, six receiving spaces are formed by the six bends. The receiving spaces can serve as spaces for mechanical supports to withstand sufficient stress from the electric mobility scooter. Thus, the wireless charger can include at least one mechanical support disposed within the receiving spaces and configured to withstand high mechanical loads.

[0091] like Figure 4As shown, the coil structure of the receiver (Ls) can be substantially the same as that of the transmitter. That is, the receiver (Ls) can have a receiving coil configured to receive power wirelessly and includes multiple windings (111-113) wound in a helical shape, wherein at least one turn of the multiple windings includes at least one bend to form a receiving space. Figure 4 As shown, the receiving coil includes an N-turn winding, and the second innermost winding (winding #2) has six bends, and correspondingly, six receiving spaces are formed by the six bends. The receiving spaces can serve as spaces for mechanical supports to withstand external stresses. Furthermore, the receiving spaces can accommodate a mechanical connector for connecting the receiving coil to the body of a remote device (e.g., an electric mobility scooter). The structure of the receiving coil and its bends can be the same as that of the transmitting coil, therefore its detailed description will be omitted.

[0092] In addition, wireless chargers may include the above reference. Figure 2 and Figure 3 The power conversion circuit discussed will not be described again here.

[0093] like Figure 4 As shown, the bend is formed on the second innermost winding (winding #2), but it should be noted that this disclosure is not limited thereto. According to an embodiment of this disclosure, at least one bend is provided at any one of the second innermost to outermost turns of the transmitting coil, and the bend bends along a direction away from the inner side of the at least one turn in the plurality of windings. That is, the bend is formed on any one turn other than the innermost turn of the coil.

[0094] In one embodiment, six bends are included in one turn, but this disclosure is not limited thereto; the bends may have different numbers and may be formed on different turns. Furthermore, in the case where a turn has multiple bends, the bends may be evenly spaced along the turn. Figure 4 As shown, the six curved sections are arranged at equal intervals along the circular turn.

[0095] like Figure 4 As shown, each turn of the multiple windings is configured to have the same turn pitch except at the bend where the turn pitch is reduced. That is, at the location where the bend is provided, the turn pitch of the windings can be reduced. In addition, the turn pitch of adjacent windings can also be reduced and can be varied to adapt to the geometry of the mechanical support.

[0096] In this disclosure, the mechanical support is formed of a non-conductive and non-magnetic material. The mechanical support can be formed as a pillar to withstand external mechanical loads. For example, the mechanical support can be a plastic pillar formed within a receiving space. The plastic pillars can be uniformly distributed within the transmitting coil to withstand external mechanical loads.

[0097] Each turn of the transmitting coil can be circular, but this disclosure is not limited thereto. In some other embodiments, the turns of the transmitting coil can also have other shapes. For example, the windings can be polygonal, such as triangular, rectangular, pentagonal, hexagonal, etc. Figure 5 A wireless charging system having a rectangular N-turn induction coil structure for both the transmitter and receiver is shown according to an embodiment of the present disclosure; and Figure 6 A wireless charging system having a hexagonal N-turn induction coil structure for both the transmitter and receiver is shown according to an embodiment of the present disclosure.

[0098] like Figure 5 and Figure 6 As shown, in embodiments of this disclosure, the polygonal winding can be a regular polygon, and the curved portion is disposed on each side of the polygon. For example, the curved portion is disposed in the middle of each side of the polygon, such that the curved portion is evenly distributed along the winding.

[0099] More in detail, such as Figure 5 As shown, another embodiment of this disclosure provides a second wireless charging system 200 having a rectangular N-turn induction coil (211-213 and 221-223) structure. Specifically, the second wireless charging system includes a rectangular transmitting coil 210 and a rectangular receiver 220. The rectangular transmitting coil has space for mechanical support to withstand sufficient stress from the electric mobility scooter, and the rectangular receiver 220 has space for mechanical support for connecting the receiving coil to a remote device (e.g., an electric mobility scooter).

[0100] In addition, such as Figure 6 As shown, another embodiment of this disclosure provides a third wireless charging system 300 with a hexagonal N-turn induction coil (311-313 and 321-323) structure. Specifically, the third wireless charging system includes a hexagonal transmitting coil 310 and a hexagonal receiver 320. The hexagonal transmitting coil has space for mechanical support to withstand sufficient stress from the electric mobility scooter, and the hexagonal receiver 320 has space for mechanical support for connecting the receiving coil to a remote device (e.g., an electric mobility scooter), such as... Figure 6 What is shown.

[0101] In another example, when the winding is rectangular, the receiving spaces are also formed at each corner of the rectangle. That is, when the winding is rectangular, in addition to the four receiving spaces formed on the four sides, four more receiving spaces can be formed at the four corners. In other words, eight receiving spaces can be provided in one turn of the winding. This allows for the provision of more mechanical supports to withstand high mechanical loads.

[0102] Furthermore, according to the above embodiments, the structure of the receiving coil can be basically the same as that of the transmitting coil, so a detailed description will be omitted.

[0103] Figures 4 to 6 Three different shapes of Tx and Rx induction coils are provided. Clearly, the shapes of the induction coils shown are simple exemplary designs and can be other designs. For example, without departing from the scope and spirit of this disclosure, the induction coils of the transmitter and receiver can have shapes such as square, rhombus, pentagon, heptagon, octagon, ellipse, star, or clover.

[0104] In the above embodiments, the wireless charging system includes a wireless charging remote device corresponding to a wireless charger. The wireless charging remote device can be, for example, an electric mobility scooter, and the wireless charging remote device can include: a main body; a receiving coil disposed on the underside of the main body, configured to wirelessly receive power, and including a plurality of windings wound in a helical shape, wherein at least one turn of the plurality of windings includes at least one bend to form a receiving space; a power conversion circuit configured to convert the power received from the receiving coil to the battery management system of the electric mobility scooter; and at least one mechanical connector disposed in the receiving space and configured to connect the receiving coil to the main body.

[0105] For a detailed description of wireless charging remote devices, please refer to the corresponding description of wireless chargers above, which will not be repeated here.

[0106] The following will refer to Figure 7 Explain how the wireless charging system works. Figure 7 A schematic block diagram of a wireless charging system according to an embodiment of the present disclosure is shown.

[0107] like Figure 7 As shown, according to this embodiment, the wireless charging system can receive power from the public AC power grid. Figure 7 Box 401 schematically illustrates an AC grid, but it should be understood that an AC grid is not a necessary part of a wireless charging system.

[0108] The AC power received from the AC grid is supplied to the AC-DC rectifier 402, and the AC power is converted into DC power by the AC-DC rectifier 402. The DC power can correspond to... Figure 2 and Figure 3 The power supply Vdc shown is not described in detail here. However, it should be understood that when using a DC power supply, the AC-DC rectifier 402 can be omitted.

[0109] The DC power is then supplied to the DC-AC inverter 403, and the DC power is converted into AC power for transmission through the transmitting coil. The DC-AC inverter 403 may include switching and bridge circuitry, such as... Figure 2 and Figure 3 The switches S1 to S4 and the bridge circuit shown are not described in detail here.

[0110] Then, AC power is provided to the transmit compensation network 404, which may include Figure 2 The SS compensation network shown, or Figure 3 The LCC-S compensation network shown will not be described in detail in this paper.

[0111] The compensated AC power is then provided to the transmitting coil 405 for wireless power transmission, and subsequently received by the receiving coil 406. Detailed structures of the transmitting coil 405 and the receiving coil 406 can be found in the embodiments described above, and will not be repeated here.

[0112] Furthermore, the received AC power is provided to the receive compensation network 407. Details of the compensation network can be found in [reference needed]. Figure 2 and Figure 3 The SS compensation network or LCC-S compensation network shown will not be described in detail here.

[0113] The compensated AC power is then supplied to the AC-DC rectifier 408 and converted to DC power to DC charge the battery. The AC-DC rectifier 408 may include diodes and a bridge circuit, such as... Figure 2 and Figure 3 The diodes Da-Dd and the bridge circuit shown will not be described in detail here.

[0114] The DC power is then provided to the battery management system (BMS) 409, which manages the charging voltage and charging current to charge the battery 410. The BMS 409 may include the buck converter discussed in the above embodiments, which will not be described in detail here.

[0115] The following example uses an electric mobility scooter for reference. Figure 8 The wireless charging system and charging method are described. Figure 8 A schematic diagram of a wireless charging system according to an embodiment of the present disclosure is shown.

[0116] like Figure 8 As shown, the wireless charging remote device is an electric mobility scooter, which includes a main body 501 and... Figure 7 Each of components 406-410 shown, and the wireless charger includes Figure 7 Each of the components 401-405 shown. Similar reference numerals denote the same or similar elements, therefore repeated descriptions will be omitted.

[0117] When charging the electric mobility scooter, the scooter is positioned above the transmitting coil 405 of the wireless charger. Then, the power conversion circuits of both the wireless charger and the electric mobility scooter are activated to initiate power transmission. That is, AC power from the AC power grid 401 is converted, transmitted, and used to charge the battery 410 of the electric mobility scooter. Detailed procedures can be found in the above embodiments and will not be repeated here.

[0118] During the charging process, the method also includes using the power conversion circuitry of the wireless charger and the electric mobility scooter to monitor and adjust power transmission.

[0119] Furthermore, the method may also include performing periodic stress and thermal management analyses to ensure the integrity of the mechanical support and effective heat dissipation. That is, in embodiments, the power conversion circuitry may include a closed-loop system comprising sensors and controllers configured to maintain a constant voltage range and ensure stable operation under a wide range of load conditions.

[0120] exist Figure 8 In the illustrated embodiments, the wireless charger is embedded underground, for example, under the floor of a charging station, but this disclosure is not limited thereto. According to embodiments of this disclosure, the wireless charger includes a mechanical support configured to withstand high mechanical loads, thus allowing it to be mounted on the ground. For example, as... Figure 9 As shown, in surface-mount installation, the wireless charger is surface-mounted onto a ground surface, such as the floor of a charging station. Because the wireless charger can withstand high mechanical loads, it will not be damaged by heavier electric vehicles (e.g., electric mobility scooters).

[0121] In this disclosure, whether surface-mounted or recessed-mounted, the location where the wireless charger is installed can be referred to as a charging station. Wireless charging remote devices (e.g., electric mobility scooters) can be driven to any charging station and charged by the wireless charger installed at that station.

[0122] This allows for flexible charging methods, as charging stations can be built in many locations where wireless charging may be needed. For example, in public transportation systems (such as urban rail transit systems), charging stations can be built either inside stations or inside trains.

[0123] For example, such as Figure 10 As shown, the charging system includes an electric mobility scooter as a wireless charging remote device, a wireless charger built into the station, and a wireless charger built into the train. The electric mobility scooter can be charged by two wireless chargers, thus providing flexible charging services for the electric mobility scooter while it is in motion, whether the user is waiting at the station or on the train.

[0124] According to embodiments of this disclosure, the overall design of the wireless charging system for electric mobility scooters integrates mechanical support components and optimized electrical parameters to meet the specific needs of the application. Wireless power transfer (WPT) technology is increasingly important for charging systems, offering significant advantages by eliminating the need for cables. This is particularly beneficial for electric mobility scooter users who find it difficult to manually connect chargers due to limited hand dexterity. The present invention employs a robust mechanical support system tailored for electric mobility scooters, addressing issues such as efficiency, misalignment, and handling of mechanical loads. The mechanical design includes an integrally integrated coil and space for mechanical support components (e.g., plastic struts), theoretical analysis, and a flexible mounting method for surface-mounted wireless charging devices.

[0125] Electrical parameters are optimized through an LCC-S compensation network to ensure a relatively constant voltage output. Furthermore, the system includes a closed-loop system for voltage regulation and a buck converter for managing voltage spikes under varying load conditions. This invention fills a significant gap in wireless charging technology for electric mobility scooters, enhancing individual mobility, reducing caregiver involvement, and promoting greater user independence. The integrated design not only improves performance but also ensures the safety and durability of the electric mobility scooter, making it suitable for charging in a wider range of scenarios, such as public transportation stations and inside vehicles.

[0126] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are illustrative only and not restrictive. Inspired by this application, those skilled in the art can make various forms without departing from the concept and scope of the claims. All such forms fall within the scope of protection of this application.

Claims

1. A wireless charger, comprising: The transmitting coil is configured to transmit power wirelessly and includes a plurality of windings wound in a helical shape, wherein at least one turn of the plurality of windings includes at least one bend to form a receiving space. A power conversion circuit is configured to supply power to the transmitting coil; and At least one mechanical support is disposed in the receiving space and configured to withstand high mechanical loads.

2. The wireless charger according to claim 1, wherein, Each turn of the plurality of windings is wound into at least one of a circle or a polygon.

3. The wireless charger according to claim 2, wherein, The at least one bend is located at any one of the second innermost to outermost turns of the transmitting coil, and the bend bends along the direction of the turn away from the inner side of the at least one turn of the plurality of windings.

4. The wireless charger according to claim 3, wherein, When the winding is circular, the at least one turn of the plurality of windings includes a plurality of bends arranged at equal intervals along the circle; as well as In the case where the winding is polygonal, the at least one turn of the plurality of windings includes a bend provided on each side of the polygon.

5. The wireless charger according to claim 4, wherein, In the case where the winding is rectangular, the receiving space is also formed at each corner of the rectangle.

6. The wireless charger according to claim 1, wherein, Each turn of the plurality of windings is configured to have the same turn spacing except at the bends where the turn spacing decreases.

7. The wireless charger according to claim 1, wherein, The mechanical support is formed of a non-conductive and non-magnetic material.

8. The wireless charger according to claim 1, wherein, The power conversion circuit includes an LCC-S compensation network configured to maintain a constant voltage output under a wide range of load conditions.

9. The wireless charger according to claim 1, wherein, The wireless charger is embedded below the floor surface, or it is mounted on the floor surface.

10. The wireless charger according to claim 1, wherein, The wireless charger is configured to be installed at public transport stations or inside vehicles.

11. A wireless charging remote device, comprising: main body; A receiving coil, disposed on the underside of the main body, is configured to receive power wirelessly and includes a plurality of windings wound in a helical shape, wherein at least one turn of the plurality of windings includes at least one bend to form a receiving space. A power conversion circuit is configured to convert power received from the receiving coil into the battery management system of the wireless charging remote device; and At least one mechanical connector is disposed in the receiving space and configured to connect the receiving coil to the body.

12. The wireless charging remote device according to claim 11, wherein, Each turn of the plurality of windings is wound into at least one of a circle or a polygon.

13. The wireless charging remote device according to claim 12, wherein, The at least one bend is located at any one of the second innermost to outermost turns of the transmitting coil, and the bend bends along the direction of the turn away from the inner side of the at least one turn of the plurality of windings.

14. The wireless charging remote device according to claim 13, wherein, When the winding is circular, the at least one turn of the plurality of windings includes a plurality of bends arranged at equal intervals along the circle; as well as In the case where the winding is polygonal, the at least one turn of the plurality of windings includes a bend provided on each side of the polygon.

15. The wireless charging remote device according to claim 14, wherein, In the case where the winding is rectangular, the receiving space is also formed at each corner of the rectangle.

16. The wireless charging remote device according to claim 11, wherein, Each turn of the plurality of windings is configured to have the same turn spacing except at the bends where the turn spacing decreases.

17. The wireless charging remote device according to claim 11, wherein, The power conversion circuit includes a closed-loop system comprising sensors and a controller configured to maintain a constant voltage range and ensure stable operation over a wide range of load conditions.

18. The wireless charging remote device according to claim 11, wherein, The power conversion circuit includes a buck converter configured to mitigate voltage spikes and maintain a stable voltage under open-circuit or high-load conditions.

19. A method for wirelessly charging a wireless charging remote device using the wireless charger according to claim 1, comprising: Position the wireless charging remote device above the transmitting coil of the wireless charger; as well as Activate the power conversion circuit of the wireless charger and the power conversion circuit of the wireless charging remote device to initiate power transmission; as well as The power conversion circuit of the wireless charger and the power conversion circuit of the wireless charging remote device are used to monitor and adjust power transmission.

20. The method of claim 19 further includes performing periodic stress and thermal management analysis to ensure the integrity of the mechanical support and effective heat dissipation.

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