Electric two-wheeled vehicle wireless charging system based on single resonance system

Abstract

This invention relates to a wireless charging system for electric two-wheeled vehicles based on a single resonant system, used for wirelessly charging an electric two-wheeled vehicle (3). The charging system includes a charging box (1), a magnetic charging structure (2), and the electric two-wheeled vehicle (3). The charging box (1) transmits electrical energy to the receiving circuit of the electric two-wheeled vehicle (3) through the magnetic charging structure (2). Compared with the prior art, this invention has the advantages of small size, low cost, high alignment accuracy, and stable charging.

Description

Technical Field

[0001] This invention relates to the field of wireless charging for electric two-wheeled vehicles, and in particular to a wireless charging system for electric two-wheeled vehicles based on a single resonance system. Background Technology

[0002] Electric two-wheelers are a preferred mode of transportation for daily travel. They are small, lightweight, do not require parking spaces or excessive public space, and are convenient to use, requiring only regular charging. Furthermore, electric two-wheelers align with green and environmentally friendly principles, helping to save energy and protect the natural environment, making them a top choice for daily travel. However, electric two-wheeler charging adapters are generally bulky and inconvenient to carry, posing risks in unpredictable outdoor environments such as humidity, overheating, and corrosion. Charging electric two-wheelers indoors also poses a significant fire and explosion hazard. Wireless charging technology has matured and is gradually influencing electric two-wheeler charging methods. Due to its convenience and environmental adaptability, wireless charging effectively solves the aforementioned problems. Wireless charging for electric two-wheelers is being piloted and promoted in some areas, with continuous improvements.

[0003] However, currently, most wireless charging methods for electric two-wheelers utilize charging stations or wireless charging transmitter coils laid on the ground, which occupy a large space and are costly. The charging distance and horizontal freedom of current wireless charging methods still need improvement. The alignment precision required for wireless charging of electric two-wheelers using these methods is high; if the electric two-wheeler is not in the designated position or is parked unstablely, wireless charging will be unstable, thus affecting charging efficiency. For example, patent application CN201921431450.0, filed on August 30, 2019, discloses a wireless charging transmitter and charging system for electric two-wheelers. This system uses a transmitter located inside a charging station to match a charging receiver located at the front of the vehicle basket for wireless charging. Precise alignment is required during charging, and the charging station occupies a large space. Furthermore, if a dual-resonance system is used for wireless charging of electric two-wheelers, the operating frequency will be severely split due to strong near-field coupling.

[0004] Therefore, the disadvantages of the existing technology include: 1. The charging pile or the laying of the transmitting coil occupies a large space; 2. The charging pile or the laying of the transmitting coil is costly; 3. It is difficult to align the charging pile or the laying of the transmitting coil during charging; 4. There is a strong coupling frequency splitting problem in the dual resonance system; 5. The dual resonance system is more susceptible to foreign object interference than the single resonance system. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a wireless charging system for electric two-wheeled vehicles based on a single resonance system.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] According to a first aspect of the present invention, a wireless charging system for an electric two-wheeled vehicle based on a single resonant system is provided for wirelessly charging the electric two-wheeled vehicle. The charging system includes a charging box, a magnetic charging structure, and an electric two-wheeled vehicle. The charging box transmits electrical energy to the receiving circuit of the electric two-wheeled vehicle through the magnetic charging structure.

[0008] As a preferred technical solution, the magnetic charging structure includes a transmitter structure and a receiver structure. The transmitter structure is connected to the charging box, and the receiver structure is installed on the electric two-wheeler and connected to the receiver circuit.

[0009] As a preferred technical solution, both the transmitting end structure and the receiving end structure include a coil for magnetic field coupling and a magnet for aligning and attracting the coil.

[0010] As a preferred technical solution, one of the coils in the transmitting end structure and the receiving end structure is a resonant coil and the other is a non-resonant coil. The intrinsic frequency of the resonant coil is the only single operating frequency of the system.

[0011] As a preferred technical solution, the transmitting end structure and the receiving end structure have the same disc-shaped outer shell.

[0012] As a preferred technical solution, the coil and magnet are located inside a disc-shaped outer casing.

[0013] As a preferred technical solution, the coil is located in the center of the disc-shaped outer shell, and the magnet is located at the edge of the disc-shaped outer shell.

[0014] As a preferred technical solution, the magnet is a plurality of block magnets.

[0015] As a preferred technical solution, the charging box is connected to the transmitter structure via coil wires and protection wires.

[0016] As a preferred technical solution, the receiving end structure is located below the handlebars of the electric two-wheeled vehicle.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. Magnetic wireless charging solutions can effectively save space;

[0019] 2. The transmitter section is small in size and low in cost;

[0020] 3. The magnetic charging transmitter and receiver are directly attached, ensuring high alignment accuracy;

[0021] 4. Only one resonant coil exists, resulting in a single and stable charging frequency;

[0022] 5. A single resonant system will not output a short circuit when there is metal in the surrounding area, which greatly improves its safety performance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the wireless charging system structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the magnetic charging structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the single-resonance system at the transmitter of the present invention.

[0026] Figure 4 This is a schematic diagram of the single resonance system at the receiver end of the present invention.

[0027] Figure 5 This is a schematic diagram of the coil magnetic coupling structure of the single resonance at the transmitting end of the present invention;

[0028] Figure 6 This is a schematic diagram of the coil magnetic coupling structure of the receiving end of the present invention.

[0029] 1 is the charging box, 2 is the magnetic charging structure, 3 is the electric two-wheeler, 4 is the coil wire and protection wire, 21 is the transmitter structure, 22 is the receiver structure, 211 is the transmitter shell, 212 is the transmitter coil, 213 is the transmitter magnet, 221 is the receiver shell, 222 is the receiver coil, and 223 is the receiver magnet. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] This invention provides a magnetic single-resonance wireless charging solution applicable to electric two-wheeled vehicles, meeting the demand for high-efficiency wireless charging of electric two-wheeled vehicles. It can not only effectively solve the alignment problem during wireless charging, but also operate at a single frequency within the single-resonance system, preventing splitting. Furthermore, it occupies little space and has a low cost.

[0032] like Figure 1The diagram shows a wireless charging system for an electric two-wheeler based on a single-resonance system. As shown, the system includes a charging box 1, a magnetic charging structure 2, and an electric two-wheeler 3. The charging box 1 is connected to the transmitting end structure 21 via coil wires and protective wires 4. The transmitting end structure 21 and the receiving end structure 22 are aligned, and the transmitting end coil 212 and the receiving end coil 222 are magnetically coupled to transfer wireless energy. The receiving end structure 21 is located below the handlebars of the electric two-wheeler 3 and is also designed as a disc-shaped shell with several block magnets. It houses the wireless charging receiving end coil 222, which is located inside the electric two-wheeler 3 and connected to the receiving end circuit. It is used to receive the wireless energy transferred by the transmitting end structure 21 to power the load of the electric two-wheeler.

[0033] Meanwhile, wireless power transmission utilizes a single-resonance system, meaning the system contains only one resonant coil. This resonant coil can be located at the transmitting end structure 21, wirelessly transmitting power between it and the receiving end non-resonant coil 222; alternatively, it can be located at the receiving end structure 22, wirelessly transmitting power between the transmitting end non-resonant coil and the receiving end. The operating frequency of this single-resonance system can be designed to be a single frequency between 10kHz and 1MHz. With only one resonant coil, the system's operating frequency is stable at a single frequency, namely the resonant coil's intrinsic frequency, effectively avoiding the frequency splitting problem caused by dual resonance.

[0034] like Figure 2 The diagram shows a magnetic charging structure for a wireless charging system for an electric two-wheeled vehicle based on a single resonant system. Both the transmitting coil 212 and the receiving coil 222 are located inside a disc-shaped outer casing. The transmitting structure 21 is connected to the charging box 1 via coil wires and a protection wire 4 for power supply. Figure 2 As shown, both the transmitter structure 21 and the receiver structure 22 contain several block magnets located around the coil. These magnets are used for the precise alignment of the transmitter coil 212 and the receiver coil 222 during wireless charging, while ensuring that the transmitter and receiver modules are firmly attached together to prevent unstable charging efficiency caused by misalignment.

[0035] Figure 3 This is a schematic diagram of a wireless charging system for an electric two-wheeled vehicle with a single resonant transmitter. The resonant coil is placed at the transmitter structure 21. The wireless power transmission distance is the distance between the resonant coil at the transmitter and the non-resonant coil at the receiver. The non-resonant coil at the receiver has no characteristic frequency, while the resonant coil's resonant frequency is ω0, which is also the operating frequency of this solution. This frequency is related to the overall size of the wireless power transmission system and the operating environment.

[0036] Figure 4 This is a schematic diagram of a wireless charging system for electric two-wheeled vehicles with a single resonant receiver. Its circuit connections are... Figure 3 Basically the same as, and Figure 3The difference lies in placing the resonant coil in the receiving end structure 22, and the wireless power transmission distance is the distance between the non-resonant coil at the transmitting end and the resonant coil at the receiving end. In this case, the non-resonant coil at the transmitting end has no characteristic frequency, and the resonant frequency of the resonant coil at the receiving end is ω0, which is the operating frequency of this invention.

[0037] in, Figure 3 , 4 The transmitter circuitry, not shown in detail, includes a PFC (Power Factor Correction) module, a DC-DC voltage adjustment circuit, a DC-AC inverter circuit, and a communication control circuit. The receiver circuitry includes an AC-DC rectifier circuit, a DC-DC voltage adjustment circuit, a reverse current protection circuit, a communication control circuit, and a differential sampling circuit. The communication control circuit is used for communication between the transmitter and receiver, employing frequency-modulated carrier communication with a frequency adjustment of ω0±1%~3%. The differential sampling circuit identifies the frequency to obtain data information.

[0038] In this invention, the input AC power is converted into a high-frequency AC signal by the transmitting circuit and enters the transmitting resonant coil. The resonant coil then magnetically couples with the receiving non-resonant coil, with a coupling strength of k12. Alternatively, the input AC power is converted into a high-frequency AC signal by the transmitting circuit and enters the transmitting non-resonant coil. The non-resonant coil then magnetically couples with the receiving resonant coil, with a coupling strength of k12. The receiving coil 222 then transmits the electrical energy to the receiving circuit, which finally filters and regulates the voltage before supplying power to the electric two-wheeled vehicle load.

[0039] Figure 5 This is a schematic diagram of a single-resonance magnetic coupling structure at the transmitting end. From top to bottom, it shows the transmitting resonant coil and the receiving non-resonant coil. The transmitting resonant coil has a diameter of 60mm and a thickness of 10mm. The coil can be wound with 0.1*50~100 strands of Litz wire, forming a double-layer toroidal coil with 8~10 turns. The transmitting end magnetic disk shell has an outer diameter of 80mm and a height of 10mm. The receiving non-resonant coil has a diameter of 70mm and a thickness of 10mm. The coil can be wound with 0.1*50~100 strands of Litz wire, forming a single-layer toroidal coil with 8~10 turns. The receiving end magnetic disk shell has an outer diameter of 80mm and a height of 10mm. When the operating frequency is 85kHz, the capacitance is 215μH, the resonant capacitance is 55μH, and the resonant capacitance C1 is 15nF.

[0040] Figure 6This is a schematic diagram of the magnetic coupling mechanism for a single resonant receiver. From top to bottom, it shows the non-resonant coil at the transmitter and the resonant coil at the receiver. The non-resonant coil at the transmitter has a diameter of 70mm and a thickness of 10mm. It can be wound with 0.1*50~100 strands of Litz wire, forming a single-layer toroidal coil with 8~10 turns. In this case, the magnetic outer shell of the transmitter disc has an outer diameter of 80mm and a height of 10mm. The resonant coil at the receiver has a diameter of 60mm and a thickness of 10mm. It can be wound with 0.1*50~100 strands of Litz wire, forming a double-layer toroidal coil with 8~10 turns. In this case, the magnetic outer shell of the receiver disc has an outer diameter of 80mm and a height of 10mm. When the operating frequency is 85kHz, the capacitance is 55μH, the resonant capacitance is 215μH, and the resonant capacitance C2 is 15nF.

[0041] In summary, this invention provides a magnetic single-resonance wireless charging solution applicable to electric two-wheelers. By designing the resonant coil at either the transmitter or receiver, the system is configured as a single-resonance system, operating at only one frequency—the intrinsic frequency of the resonant coil—effectively avoiding the frequency splitting problem associated with dual-resonance systems. Furthermore, the magnetic connection structure of the transmitter and receiver ensures precise alignment during wireless charging, meeting the high-efficiency wireless charging requirements of electric two-wheelers. This solution also boasts a small footprint and low cost, making it significant for the development of wireless charging for electric two-wheelers.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wireless charging system for electric two-wheeled vehicles based on a single resonance system, used for wirelessly charging electric two-wheeled vehicles (3), characterized in that, The charging system includes a charging box (1), a magnetic charging structure (2), and an electric two-wheeler (3). The charging box (1) transmits electrical energy to the receiving circuit of the electric two-wheeler (3) through the magnetic charging structure (2). The magnetic charging structure (2) includes a transmitter structure (21) and a receiver structure (22). The transmitter structure (21) is connected to the charging box (1), and the receiver structure (22) is installed on the electric two-wheeled vehicle (3) and connected to the receiver circuit. Both the transmitting end structure (21) and the receiving end structure (22) include a coil for magnetic field coupling and a magnet for aligning and attracting the coil; One of the coils in the transmitting end structure (21) and the receiving end structure (22) is a resonant coil and the other is a non-resonant coil. The intrinsic frequency of the resonant coil is the only single operating frequency of the system. The input AC power is converted into a high-frequency AC signal by the transmitting circuit and enters the transmitting resonant coil. Then, the resonant coil and the receiving non-resonant coil are magnetically coupled with a coupling strength of k12. Alternatively, the input AC power is converted into a high-frequency AC signal by the transmitting circuit and enters the transmitting non-resonant coil. Then, the non-resonant coil and the receiving resonant coil are magnetically coupled with a coupling strength of k12. The receiving coil then transmits the electrical energy to the receiving circuit, and finally, after filtering and voltage regulation by the receiving circuit, it powers the load of the electric two-wheeled vehicle. The transmitting end structure (21) and the receiving end structure (22) have the same disc-shaped outer shell; the receiving end structure (22) is located below the handlebars of the electric two-wheeled vehicle (3); Both the transmitter structure (21) and the receiver structure (22) contain several block magnets located around the coil, which are used for the precise alignment of the transmitter coil (212) and the receiver coil (222) during wireless charging, while ensuring that the transmitter module and the receiver module are firmly attached together.

2. The wireless charging system for an electric two-wheeled vehicle based on a single resonance system according to claim 1, characterized in that, The charging box (1) is connected to the transmitter structure (21) via coil wire and protection wire (4).

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