Dynamic wireless charging electromagnetic coupling charging structure

Abstract

The invention provides a dynamic wireless charging electromagnetic coupling charging structure. U-shaped magnetic core primary coils are distributed on the ground, and the two ends of the magnetic core primary coils correspond to ground guide rails; the vehicle is provided with an H-shaped double-guide-rail magnetic core secondary coil, and the double-guide-rail magnetic core secondary coil is composed of two parallel supporting arms arranged in the vehicle and a magnetic beam frame. The interval between the magnetic core primary coils is smaller than the span of the two ends of the double-guide-rail magnetic core secondary coil. When the vehicle moves on the ground guide rail, the double-guide-rail magnetic core secondary coil and the magnetic core primary coil generate induced electromotive force between air gaps smaller than or equal to 10 mm, and therefore a battery in the vehicle is charged. The dynamic coupling wireless charging structure has the advantages that the dynamic coupling wireless charging structure applied to the small-air-gap (0-10 mm) environment is provided, and the problems that the coupling effect is poor in the small-air-gap scene, continuous charging cannot be achieved, and the charging efficiency cannot be guaranteed in the prior art are solved based on the electromagnetic induction principle of a transformer.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging, and in particular to a dynamic wireless charging electromagnetic coupling charging structure. Background Art

[0002] For new intelligent robots such as logistics handling robots and automatic inspection vehicles that have relatively fixed movement routes and need to work continuously, battery capacity and battery life have always been a major problem to be solved. However, with the development and innovation of wireless charging technology, the battery capacity and operation time have been greatly optimized. Compared with traditional wired charging, wireless charging has the advantages of strong adaptability, high flexibility, high work efficiency, and low work cost. Wireless charging can be divided into static wireless charging SWC (Static wireless charging) and dynamic wireless charging DWC (Dynamic Wireless Charging). Static charging requires the transmitter and receiver to remain relatively still, which limits the working time and efficiency of the equipment to a certain extent. However, dynamic charging takes into account the advantages of static and dynamic. It does not need to remain still and can continue to charge during the operation of the equipment, which greatly shortens the working time and improves the work efficiency. It also reduces the weight of the battery and reduces the working cost. It is the main direction of the development of wireless charging technology in the future. Dynamic wireless charging technology includes the magnetic coupling structure of the receiving end and the transmitting end, the inverter rectifier compensation circuit, the offset misalignment control, etc., which improves the transmission efficiency of the entire system by increasing the coupling coefficient of the system, reducing reactive power, and optimizing the offset. Current wireless charging technology is mostly used in static or short-distance energy transmission scenarios. When the device is in motion, the stability and efficiency of energy transmission are often affected due to the displacement offset.

[0003] In a dynamic wireless charging system, the dynamic change of the small air gap may cause the relative position between the primary and secondary coils to change continuously, especially in a moving or vibrating environment, which makes the electromagnetic coupling efficiency unstable. Secondly, when the secondary coil moves in multiple magnetic field areas of the distributed primary coil, power switching occurs, causing the system to frequently adjust the coupling parameters (such as frequency, phase, etc.). The instability in this process will also lead to a decrease in the efficiency of energy transmission.

[0004] Therefore, it is difficult for existing designs to achieve stable energy transfer under small air gap conditions (0mm-10mm). In particular, when the device is moving along a track or undergoing linear displacement, the electromagnetic coupling effect is not ideal, which can easily lead to charging interruptions and reduced charging efficiency.

[0005] Therefore, how to modify and provide a coupled charging system that can be used in small air gap scenarios becomes an urgent problem to be solved. Summary of the invention

[0006] The present invention provides a dynamic wireless charging electromagnetic coupling charging structure to solve the problem that the prior art has poor coupling effect in a small air gap scenario and cannot continuously charge to ensure charging efficiency.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides a dynamic wireless charging electromagnetic coupling charging structure, including: a U-shaped magnetic core primary coil is distributed on the ground, and the two ends of the magnetic core primary coil correspond to the ground rails; an H-shaped dual-rail magnetic core secondary coil is arranged on the vehicle, and the dual-rail magnetic core secondary coil is composed of two parallel arms and a magnetic beam frame arranged in the vehicle; the interval between each of the magnetic core primary coils is smaller than the span at both ends of the dual-rail magnetic core secondary coil; the magnetic core primary coil is charged, and when the vehicle moves on the ground rail, the dual-rail magnetic core secondary coil and the magnetic core primary coil generate an induced electromotive force between an air gap less than or equal to 10 mm, thereby charging the battery in the vehicle.

[0008] As a preferred embodiment of the above technical solution, preferably, each of the magnetic core primary coils is connected in series or in parallel and arranged at intervals along the moving direction of the vehicle, and both ends thereof are directly connected to the ground guide rail or installed under the working platform.

[0009] As a preferred embodiment of the above technical solution, preferably, the parallel double-arm structure of the dual-rail magnetic core secondary coil is a magnetic conductive path, which is used to guide the magnetic flux generated by the vehicle during movement into the coil, thereby increasing the induced electromotive force, so that the magnetic beam frame can continuously charge the battery in the vehicle.

[0010] As a preferred embodiment of the above technical solution, preferably, when the dual-guide magnetic core secondary coil moves with the vehicle on the magnetic core primary coil, it is continuously coupled with one of the magnetic core primary coils or two adjacent magnetic core primary coils are coupled simultaneously.

[0011] As a preferred embodiment of the above technical solution, preferably, the dual-rail magnetic core secondary coil is always within the action range of the distributed magnetic core primary coil, so that the vehicle can continue to obtain the charging voltage for charging its internal battery during movement:

[0012]

[0013] Where: V s is the induced voltage in the secondary coil and also the charging voltage, N s is the number of turns of the secondary coil, and Φ is the magnetic flux transmitted in the primary coil.

[0014] The technical solution of the present invention provides a dynamic wireless charging electromagnetic coupling charging structure. A U-shaped magnetic core primary coil is distributed on the ground, and the two ends of the magnetic core primary coil correspond to the ground rails;

[0015] The vehicle is provided with an H-shaped double-track magnetic core secondary coil, which is composed of two parallel arms and a magnetic beam frame arranged in the vehicle;

[0016] The interval between each of the magnetic core primary coils is smaller than the span between the two ends of the dual-track magnetic core secondary coil;

[0017] The magnetic core primary coil is charged, and when the vehicle moves on the ground rail, the dual-rail magnetic core secondary coil and the magnetic core primary coil generate an induced electromotive force between the air gap of less than or equal to 10mm, thereby charging the battery in the vehicle. The advantage of the present invention is to provide a dynamic coupling wireless charging structure for use in a small air gap (0-10mm) environment, based on the electromagnetic induction principle of a transformer, suitable for application scenarios where vehicle equipment is continuously powered during a relatively fixed moving route, solving the problem that the prior art has poor coupling effect in a small air gap scenario and cannot continuously charge to ensure charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A complete side view of a dynamic wireless charging electromagnetic coupling charging structure provided by the present invention.

[0020] Figure 2 for Figure 1 Front view of the secondary coil of the double-guide core.

[0021] Figure 3 for Figure 1 Side view of the secondary coil of the dual-guide core.

[0022] Figure 4 for Figure 1 Top view of the secondary coil of the dual-guide core.

[0023] Figure 5 for Figure 1 Front view of .

[0024] Figure 6 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention provides a wireless charging system which is applied to rail vehicles, especially AGV vehicles, and which combines an H-shaped secondary coil 2 with a distributed magnetic core primary coil 1.

[0027] In this method, the magnetic core primary coil 1 is distributed on the rails or paths that the vehicle must pass, and the H-shaped double-rail magnetic core secondary coil 2 is installed in the vehicle.

[0028] The dual-track magnetic core secondary coil 2 consists of two parallel arms 21 and a magnetic beam frame 22, which are installed in the vehicle. The parallel arms 21 are installed between the corresponding front and rear wheels, parallel to the track / path, and there is a vertical magnetic beam frame 22 between the two parallel arms 21, thereby forming an H-shaped dual-track magnetic core in the vehicle.

[0029] Furthermore, the H-shaped double-guide magnetic core is used as the secondary coil 2, and the distance between the H-shaped double-guide magnetic core and the magnetic core primary coil 1 is less than or equal to 10 mm.

[0030] like Figure 5 As shown, the magnetic core primary coil 1 is U-shaped, and its two ends correspond to the positions of the ground rails, and its body is pre-buried in the ground or embedded in the ground. For the case of being pre-buried underneath: when the rails are embedded in the ground, the rails are laid in sections or completely. If the rails are laid in sections, a U-shaped magnetic core primary coil 1 is set between each section, and the body of the U-shaped magnetic core primary coil 1 is buried in the ground and its two ends are connected to the adjacent rail sections; if the rails are laid completely, the U-shaped magnetic core primary coil 1 is completely buried in the ground, and its body is buried deeper, and the ends of its two ends are in direct contact with the bottom surface of the rails. For the case of being embedded in the ground: when the rails are higher than the ground, the rails are laid in sections, and a U-shaped magnetic core primary coil 1 is set between each section, and the body of the U-shaped magnetic core primary coil 1 is embedded in the ground, and the U-shaped magnetic core primary coil 1 serves as a connector between the rails.

[0031] The interval between the magnetic core primary coils 1 is smaller than the distance between the parallel arms 21 in the H-shaped double-track magnetic core secondary coils 2, thereby ensuring that the secondary coils 2 always remain coupled with the primary coils during movement to achieve continuous power transmission.

[0032] Furthermore, each U-shaped magnetic core primary coil 1 is connected in series / parallel.

[0033] When the vehicle is moving, the H-type double-rail magnetic core secondary coil 2 continues to couple with one of the magnetic core primary coils 1 or two adjacent magnetic core primary coils 1 at the same time as the vehicle moves on the magnetic core primary coil 1. During this process, the parallel double arm 21 structure of the H-type double-rail magnetic core secondary coil 2 therein forms a magnetic conductive path, which is used to guide the magnetic flux generated by the vehicle during movement into the coil, thereby increasing the induced electromotive force, so that the magnetic beam frame 22 can continuously charge the battery in the vehicle.

[0034] For the charging process:

[0035] The working principle of the system's wireless power transmission is based on Faraday's law of electromagnetic induction, which states that when the magnetic flux changes over time, an induced electromotive force will be generated in the conductor. The specific expression is:

[0036]

[0037] Where: V s is the induced electromotive force (V), and Φ is the magnetic flux (Wb).

[0038] The voltage relationship between the primary winding and the secondary winding is determined by the turns ratio of the windings. If the turns of the primary winding are NP and the turns of the secondary winding are Ns, the voltage relationship is:

[0039]

[0040] Where: V p is the primary voltage (V), V s is the secondary voltage (V).

[0041] The relationship between the mutual inductance coefficient M and the self-inductance L1 and L2 generated by the two coils is:

[0042]

[0043] When the primary coil on the ground is energized, it generates a changing magnetic flux. The vehicle moves along the track or a predetermined path, and the H-shaped secondary coil 2 inside it captures these magnetic fluxes during the movement, generating an induced electromotive force, thereby realizing power transmission. Due to the distributed layout of the primary coil, the secondary coil 2 is always within the range of the magnetic field, so that the vehicle can continue to obtain the charging voltage for charging its internal battery during the movement:

[0044]

[0045] Where: V s is the induced voltage in the secondary coil 2 and also the charging voltage, N s is the number of turns of the secondary coil 2, and Φ is the magnetic flux transmitted in the primary coil.

[0046] Furthermore, the two arms 21 of the H-type secondary coil 2 are magnetic paths, providing a transmission medium for the magnetic flux, preventing the magnetic flux from being lost due to the presence of gas in the air gap, thereby optimizing the transmission of the magnetic flux in the air gap and effectively reducing magnetic leakage.

[0047] The present invention increases the coupling distance and magnetic flux efficiency by arranging an H-shaped double-guide magnetic core secondary coil 2 in the vehicle. Specifically, since the primary coil of the H-shaped structure is composed of two parallel arms 21, the two arms 21 are respectively used as part of the coil, which can enhance the continuity of the magnetic field. At the same time, the two parallel arms 21 can extend the magnetic flux range, thereby ensuring that the secondary coil 2 does not leave the coupling range during movement, thereby improving the capture ability and concentration of the magnetic flux and effectively reducing the leakage magnetic phenomenon.

[0048] Double-guide design: The double-arm 21 structure of the H-type secondary coil 2 can guide the magnetic flux to be concentrated into the coil through two main paths, thereby increasing the induced electromotive force.

[0049] Magnetic flux guidance: The two arms 21 of the secondary coil 2 are magnetic paths, which can optimize the transmission of magnetic flux in the air gap.

[0050] The U-shaped magnetic core primary coils 1 are distributedly arranged on the track / path, and the intervals between them are usually smaller than the length of the arms 21 of the secondary coils 2, thereby ensuring that the secondary coils 2 are continuously dynamically coupled with multiple primary coils during the entire movement process.

[0051] Specifically, when the vehicle is moving, for example Figure 1 As shown in the figure, move from left to right, refer to Figure 6 At this time, the U-shaped magnetic core primary coil 1# generates a current i 1 The double arm 21 of the secondary coil 2 generates a current i 2 The two induced currents make the conductor act on the Ampere force, thus making the conductor move. The secondary coil 2 generates a voltage and generates a current i 2 , from charging the car, the vehicle continues to move forward to the right and contacts the primary coil 2# in the air, refer to Figure 1 At this time, the U-shaped magnetic core primary coil 2# generates an induced current, and the double arms 21 of the H-shaped secondary coil 2 also generate an induced current correspondingly to continuously charge the vehicle battery through the magnetic beam frame 22.

[0052] According to the requirements of the load and system working environment, the parallel connection of the primary coil is mainly applicable to the following three situations: loads that need to provide larger currents; working environments where the coil position and coupling strength vary greatly; and loads with low voltage and large current requirements. The series connection of the primary coil is mainly applicable to the following three other situations: loads that need to provide higher voltages; high-frequency working environments that require higher resonant frequencies; and stable load and coupling conditions.

[0053] The primary coils are connected in parallel or series to ensure uniform current distribution throughout the path.

[0054] Depending on the application requirements, the primary coil can adopt a series or parallel circuit layout to ensure stable operation under different voltage and current conditions.

[0055] In summary, the present invention provides a dynamic coupling wireless charging system for use in a small air gap (0-10mm) environment, which is based on the electromagnetic induction principle of a transformer and is suitable for application scenarios in which vehicle equipment is continuously powered during a relatively fixed moving route.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dynamic wireless charging electromagnetic coupling charging structure, characterized in that: include: A U-shaped magnetic core primary coil is arranged on the ground, and two ends of the magnetic core primary coil correspond to the ground guide rails; The vehicle is provided with an H-shaped double-track magnetic core secondary coil, which is composed of two parallel arms and a magnetic beam frame arranged in the vehicle; The interval between each of the magnetic core primary coils is smaller than the span between the two ends of the dual-track magnetic core secondary coil; The magnetic core primary coil is charged, and when the vehicle moves on the ground rail, the dual-rail magnetic core secondary coil and the magnetic core primary coil generate an induced electromotive force between an air gap of less than or equal to 10 mm, thereby charging the battery in the vehicle.

2. A dynamic wireless charging electromagnetic coupling charging structure according to claim 1, characterized in that: The primary coils of the magnetic cores are connected in series or in parallel and are arranged at intervals along the moving direction of the vehicle, and both ends thereof are directly connected to the ground guide rails or installed under the working platform.

3. The dynamic wireless charging electromagnetic coupling charging structure according to claim 1, characterized in that: The parallel double-arm structure of the dual-rail magnetic core secondary coil is a magnetic conductive path, which is used to guide the magnetic flux generated by the vehicle during movement into the coil, thereby increasing the induced electromotive force, so that the magnetic beam frame can continuously charge the battery in the vehicle.

4. The dynamic wireless charging electromagnetic coupling charging structure according to claim 1, characterized in that: When the dual-track magnetic core secondary coil moves on the magnetic core primary coil as the vehicle does, it is continuously coupled with one of the magnetic core primary coils or is coupled with two adjacent magnetic core primary coils simultaneously.

5. The dynamic wireless charging electromagnetic coupling charging structure according to claim 1, characterized in that: The dual-track magnetic core secondary coil is always within the range of action of the distributed magnetic core primary coil, so that the vehicle can continue to obtain a charging voltage for charging its internal battery during movement: Where: V s is the induced voltage in the secondary coil and also the charging voltage, N s is the number of turns of the secondary coil, and Φ is the magnetic flux transmitted in the primary coil.

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