A self-pickup dynamic wireless charging system

Abstract

The application provides a self-picking dynamic wireless charging system, which comprises a transmitting coil, the transmitting coil converts high-frequency alternating current into alternating electromagnetic field energy for transmission, a receiving coil, the receiving coil receives the alternating electromagnetic field energy and converts it into high-frequency alternating current, when the transmitting coil and the receiving coil are in a directly opposite position, the equivalent self-induction parameter of the transmitting coil meets the required electrical parameter for ideal resonance of a resonance topology, and the transmitting coil and a transmitting compensation circuit are in a resonance state.The application has the beneficial effects that: the accurate and rapid identification and automatic tracking of the position of a load end can be realized without additional devices, and the investment cost is reduced; the switching switch and the corresponding control algorithm program are not needed, the power adaptive adjustment of multiple transmitting ends is realized, and the transmission performance of the system is ensured; during the power adjustment process of the transmitting unit, the total power of the system changes little, the impact on the system is small, and the stability of the wireless electric energy transmission system is improved.

Description

Technical Field

[0001] This invention belongs to the field of wireless charging technology, and in particular relates to a self-pickup dynamic wireless charging system. Background Technology

[0002] Dynamic wireless power transfer is an effective means to solve the problems of charging time for electric vehicles, reduce battery size and weight, and lower costs. However, the transmission performance of wireless power transfer is closely related to the relative positions of the primary and secondary ends. In dynamic wireless power transfer, the identification of the load end position and the rapid and accurate switching of the transmitting unit are important technical foundations for ensuring the efficient and stable operation of dynamic wireless power transfer.

[0003] Currently, the identification of the load location in dynamic wireless power transmission mainly relies on hardware equipment such as sensors, and the switching of transmitting units depends on fast-acting switches. However, this approach requires real-time adjustment of the switching interval and allowance time for transmitting units to adapt to different road sections and vehicle speeds, resulting in limited adaptability. Especially at higher vehicle speeds (above 60 km / h) and higher transmission power (above 30 kW), the requirements for the transmitting end switching switches are extremely high, necessitating the addition of sensors for accurate and rapid identification and automatic tracking of the receiver's location, thus increasing the system's investment cost. Summary of the Invention

[0004] In view of this, the present invention aims to provide a self-pickup dynamic wireless charging system in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A self-pickup dynamic wireless charging system includes:

[0007] The system includes multiple transmitting coils, each connected to a transmission compensation circuit to form a transmitting unit. These transmitting units are connected in parallel with a power supply.

[0008] The transmitting coil is installed on the ground and converts high-frequency alternating current into alternating electromagnetic field energy for transmission;

[0009] A receiving coil is mounted on a mobile device and is connected to a receiving compensation circuit to form a receiving unit; the receiving unit is electrically connected to a load, and the receiving coil receives alternating electromagnetic field energy and converts it into high-frequency alternating current;

[0010] When the transmitting coil and the receiving coil are in a directly opposite position, the equivalent self-inductance parameter of the transmitting coil satisfies the electrical parameters required for ideal resonance of the resonant topology, and the transmitting coil and the transmitting compensation circuit are in a resonant state.

[0011] Furthermore, the power supply includes a source-to-source conversion circuit, an AC power supply, or a DC power supply. The source-to-source conversion circuit is electrically connected to the AC power supply or the DC power supply, and the source-to-source conversion circuit converts the AC power or DC power into high-frequency AC power.

[0012] Furthermore, the load includes a load-side conversion circuit and a vehicle load. The load-side conversion circuit is electrically connected to the vehicle load and converts the high-frequency AC power output from the receiving coil into electrical energy suitable for the load to consume.

[0013] Furthermore, the transmitting coil and the receiving coil have the same structure, both including an inductor coil and a high permeability plate arranged in series with insulation;

[0014] The high permeability plate covers the orthographic projection of the inductor coil.

[0015] Furthermore, a forward protection plate is provided on the side of the inductor coil away from the high permeability plate, and a backward protection plate is provided on the side of the high permeability plate away from the inductor coil. A shielding plate is provided between the backward protection plate and the high permeability plate.

[0016] The shape of the forward protection plate matches the shape of the rear protection plate, and both can cover the orthographic projection of the inductor coil, the high permeability plate and the shielding plate.

[0017] The shielding plate covers the orthographic projection of the inductor coil and the high permeability plate;

[0018] Furthermore, the forward electrode of the transmitting coil is positioned close to the forward electrode of the receiving coil, while the backward electrode of the transmitting coil is positioned away from the backward electrode of the receiving coil.

[0019] Furthermore, the transmitting compensation circuit and the transmitting coil form a resonant circuit, and the topology includes, but is not limited to, series resonant topology, parallel resonant topology, and LCC resonant topology. The equivalent self-inductance of the transmitting coil is one inductor in the resonant topology.

[0020] The receiving compensation circuit and the receiving coil form a resonant circuit. The topology includes, but is not limited to, series resonant topology, parallel resonant topology, and LCC resonant topology. The equivalent self-inductance of the receiving coil is one of the inductors in the resonant topology.

[0021] Furthermore, the high permeability plate affects the equivalent electrical parameters of the transmitting or receiving coil:

[0022] When the receiving coil moves horizontally relative to the transmitting coil, the equivalent self-inductance of both the transmitting and receiving coils will change.

[0023] When the receiving coil and the transmitting coil are directly opposite each other, their equivalent self-inductance is at its maximum. When the offset of the receiving coil relative to the transmitting coil is greater than a certain threshold, the equivalent self-inductance of the transmitting coil and the receiving coil will decrease rapidly.

[0024] When the receiving coil and the transmitting coil are directly opposite each other, the equivalent mutual inductance between them is at its maximum. When the receiving coil is offset relative to the transmitting coil, the equivalent mutual inductance will decrease continuously as the offset distance increases.

[0025] Compared with existing technologies, the self-pickup dynamic wireless charging system of the present invention has the following advantages:

[0026] (1) The self-pickup dynamic wireless charging system described in this invention does not require additional devices to achieve accurate and rapid identification and automatic tracking of the load position, thus reducing investment costs; it does not require switching switches and corresponding control algorithm programs to achieve adaptive power adjustment of multiple transmitting units, ensuring system transmission performance; during the power adjustment process of the transmitting units, the total power of the system does not change much, the impact on the system is small, and the stability of the wireless power transmission system is improved. Attached Figure Description

[0027] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1 This is a schematic diagram of the overall functional structure of the self-pickup dynamic wireless charging system according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the transmitting coil structure according to an embodiment of the present invention;

[0030] Figure 3 Here is a schematic diagram of a typical compensation circuit topology as described in an embodiment of the present invention:

[0031] Figure 4 This is a schematic diagram illustrating the change in equivalent self-inductance of the receiving coil when it moves horizontally, as described in an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram illustrating the change in equivalent mutual inductance of the receiving coil when it moves horizontally, as described in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Mains power supply; 2. Source-end conversion circuit; 3. Transmitter; 4. Receiver; 5. Load-end conversion circuit; 6. Vehicle load; 31. Transmitting coil; 32. Transmitting compensation circuit; 41. Receiver coil; 42. Receiver compensation circuit; 311. Forward protection board; 312. Inductor coil; 313. High permeability board; 314. Shielding board; 315. Rear protection board. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] like Figures 1 to 5 As shown, a self-pickup dynamic wireless charging system includes:

[0038] There are multiple transmitting coils 31, each of which is connected to a transmission compensation circuit 32 to form a transmission unit. Multiple transmission units are connected in parallel with a power supply. The transmitting coils 31 are installed on the ground and convert high-frequency alternating current into alternating electromagnetic field energy for transmission. The transmitting coils 31 and the transmission compensation circuit 32 can be connected in series, parallel, or mixed. The following is an example of a parallel structure: one end of the transmitting coil 31 is electrically connected to one end of the power supply, and the other end is electrically connected to the other end of the power supply through the transmission compensation circuit 32.

[0039] A receiving coil 41 is mounted on the mobile equipment. The receiving coil 41 is connected to a receiving compensation circuit 42 to form a receiving unit. The receiving unit is electrically connected to the load. The receiving coil 41 receives alternating electromagnetic field energy and converts it into high-frequency alternating current. The receiving coil 41 and the receiving compensation circuit 42 can be connected in series, parallel, or in a mixed manner. The following is an embodiment of the parallel structure. One end of the receiving coil 41 is electrically connected to one end of the load, and the other end of the receiving coil 41 is electrically connected to the other end of the load through the receiving compensation circuit 42.

[0040] When the transmitting coil 31 and the receiving coil 41 are in a directly opposite position, the equivalent self-inductance parameter of the transmitting coil 31 satisfies the electrical parameters required for ideal resonance of the resonant topology, and the transmitting coil 31 and the transmitting compensation circuit 32 are in a resonant state.

[0041] The power supply includes a source-to-source conversion circuit 2 and an AC power supply 1 or a DC power supply. The source-to-source conversion circuit 2 is electrically connected to the AC power supply 1 or the DC power supply. The source-to-source conversion circuit 2 converts the AC power or DC power into high-frequency AC power.

[0042] The load includes a load-side conversion circuit 5 and a vehicle load 6. The load-side conversion circuit 5 is electrically connected to the vehicle load 6. The load-side conversion circuit 5 converts the high-frequency AC power output from the receiving coil 41 into electrical energy suitable for the load to consume.

[0043] like Figure 2 As shown, both the transmitting coil 31 and the receiving coil 41 include an inductor coil 312 and a high permeability plate 313 that are sequentially insulated from each other.

[0044] The high permeability plate 313 covers the orthogonal projection of the inductor coil 312.

[0045] A forward protection plate 311 is provided on the side of the inductor coil 312 away from the high permeability plate 313, and a backward protection plate 315 is provided on the side of the high permeability plate 313 away from the inductor coil 312. A shielding plate 314 is provided between the backward protection plate 315 and the high permeability plate 313.

[0046] The shape of the forward protection plate 311 matches the shape of the rear protection plate 315, and both can cover the orthogonal projection of the inductor coil 312, the high permeability plate 313 and the shielding plate 314.

[0047] The shielding plate 314 covers the orthographic projection of the inductor coil 312 and the high permeability plate 313.

[0048] The forward protection plate 311 and the rear protection plate 315 are made of non-metallic materials with high toughness and resistance to damage, such as PVC and bakelite. The inductor coil 312 is wound with a good metallic conductor, such as soft copper wire, enameled wire, or Litz wire. The high permeability plate 313 is made or spliced ​​from high permeability materials with a permeability not less than 100 times that of air, such as ferrite, silicon steel, or nanocrystals. The shielding plate 314 is made of a good metallic conductor with electromagnetic field shielding capabilities, such as aluminum or copper plates.

[0049] The forward electrode of the transmitting coil 31 is positioned close to the forward electrode of the receiving coil 41, and the backward electrode of the transmitting coil 31 is positioned away from the backward electrode of the receiving coil 41.

[0050] like Figure 3 As shown, the transmitting compensation circuit 32 and the transmitting coil 31 constitute a resonant circuit. The resonant topology includes, but is not limited to, series resonant topology, parallel resonant topology, and LCC resonant topology. The equivalent self-inductance of the transmitting coil 31 is one inductance in the resonant topology.

[0051] The receiving compensation circuit 42 and the receiving coil 41 constitute a resonant circuit. The resonant topology includes, but is not limited to, series resonant topology, parallel resonant topology, and LCC resonant topology. The equivalent self-inductance of the receiving coil 41 is one inductance in the resonant topology.

[0052] In the resonant topology, inductors 7-a-2, 7-b-2, and 7-c-4 are the equivalent self-inductances of the transmitting coil 31 or the receiving coil 41, while inductor 7-c-2 is the compensation inductor.

[0053] The high permeability plate 313 affects the equivalent electrical parameters of the transmitting coil 31 or the receiving coil 41:

[0054] When the receiving coil 41 moves horizontally relative to the transmitting coil 31, the equivalent self-inductance of both the transmitting coil 31 and the receiving coil 41 will change.

[0055] When the receiving coil 41 and the transmitting coil 31 are in a directly opposite position, the equivalent self-inductance of the transmitting coil 31 and the receiving coil 41 is at its maximum. When the offset of the receiving coil 41 relative to the transmitting coil 31 is greater than a certain threshold, the equivalent self-inductance of the transmitting coil 31 and the receiving coil 41 will decrease rapidly.

[0056] When the receiving coil 41 and the transmitting coil 31 are in a directly opposite position, the equivalent mutual inductance between the receiving coil 41 and the transmitting coil 31 is at its maximum. When the receiving coil 41 is offset relative to the transmitting coil 31, the equivalent mutual inductance will continuously decrease as the offset distance increases.

[0057] Work process:

[0058] like Figure 4 As shown, when the receiving coil 41 moves horizontally relative to the transmitting coil 31, the equivalent self-inductance of both the transmitting coil 31 and the receiving coil 41 changes due to the effect of the high permeability plates 313 on both the receiving coil 41 and the transmitting coil 31. The equivalent self-inductance is greatest when the receiving coil 41 and the transmitting coil 31 are directly opposite each other. When the offset of the receiving coil 41 relative to the transmitting coil 31 exceeds a certain threshold, the equivalent self-inductance of the coils decreases rapidly.

[0059] like Figure 5 As shown, when the receiving coil 41 moves horizontally relative to the transmitting coil 31, the equivalent mutual inductance between the transmitting coil 31 and the receiving coil 41 changes due to the action of the high permeability plates 313 of both the receiving coil 41 and the transmitting coil 31. The equivalent mutual inductance is greatest when the receiving coil 41 and the transmitting coil 31 are directly opposite each other. As the receiving coil 41 shifts relative to the transmitting coil 31, the equivalent mutual inductance decreases continuously with the increase of the shift distance.

[0060] In the transmitter 3, multiple transmitting coils 31 and transmitting compensation circuit 32 are connected in parallel at the output of the source-end conversion circuit 2. When the receiving coil 41 of the receiver 4 is relatively displaced relative to the transmitting coil 31 in the transmitter 3, it will move a certain distance and be in a position directly opposite to a different transmitting coil 31 in the transmitter 3, while being offset from other transmitting coils 31 in the transmitter 3. The equivalent self-inductance parameter of the transmitting coil 31, which is directly opposite the receiving coil 41, satisfies the electrical parameters of the resonant circuit formed by the transmitting compensation circuit 32 and the transmitting coil 31, and is in an ideal resonant state with a very small total impedance. The equivalent mutual inductance between the transmitting coil 31 and the receiving coil 41 is the largest. The equivalent self-inductance parameter of the other transmitting coils 31, which are offset from the receiving coil 41, does not satisfy the electrical parameters of the resonant circuit formed by the transmitting compensation circuit 32 and the transmitting coil 31, and is in a non-resonant state with a very large total impedance. The equivalent mutual inductance between the other transmitting coils 31 and the receiving coil 41, which are offset from the receiving coil 41, is very small. Therefore, the transmitting coil 31, which is directly opposite the receiving coil 41, transmits the maximum power and has the best transmission performance. During the relative displacement of the receiving coil 41 of the receiving end 4 with respect to the transmitting coil 31 in the ground end, the transmitting coil 31 directly opposite the receiving coil 41 is constantly switching. The transmitting coil 31 with the maximum transmission power and transmission performance is also constantly switching, automatically identifying the position of the receiving coil 41 of the receiving end 4, without the need for an additional receiving coil 41 position identification device and a power transmission switching switch for the transmitting coil 31.

[0061] No additional devices are needed to achieve accurate and rapid identification and automatic tracking of the load position; no switching switches and corresponding control algorithms are required to achieve adaptive power adjustment of multiple transmitting units, ensuring system transmission performance; during the power adjustment of the transmitting units, the total system power does not change much, the impact on the system is small, and the stability of the wireless power transmission system is improved.

[0062] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0063] In the several embodiments provided in this application, it should be understood that the disclosed methods and systems can be implemented in other ways. For example, the division of units described above is merely a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. The aforementioned units may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention according to actual needs.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions 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, and they should all be covered within the scope of the claims and specification of the present invention.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-pickup dynamic wireless charging system, characterized in that, include: The transmitting coil (31) is a plurality of transmitting coils (31). Each transmitting coil (31) is connected to the transmitting compensation circuit (32) to form a transmitting unit. The plurality of transmitting units are connected in parallel with the power supply. The transmitting coil (31) is installed on the ground. The transmitting coil (31) converts high-frequency alternating current into alternating electromagnetic field energy for transmission. A receiving coil (41) is installed on a mobile device. The receiving coil (41) is connected to a receiving compensation circuit (42) to form a receiving unit. The receiving unit is electrically connected to a load. The receiving coil (41) receives alternating electromagnetic field energy and converts it into high-frequency alternating current. When the transmitting coil (31) and the receiving coil (41) are in a directly opposite position, the transmitting coil (31) and the transmitting compensation circuit (32) are in a resonant state; The transmitting coil (31) and the receiving coil (41) have the same structure, both including an inductor coil (312) and a high permeability plate (313) arranged in series with insulation. The high permeability plate (313) covers the orthographic projection of the inductor coil (312); A forward protection plate (311) is provided on the side of the inductor coil (312) away from the high permeability plate (313), and a backward protection plate (315) is provided on the side of the high permeability plate (313) away from the inductor coil (312). A shielding plate (314) is provided between the backward protection plate (315) and the high permeability plate (313). The shape of the forward protection plate (311) matches the shape of the rear protection plate (315), and both can cover the orthographic projection of the inductor coil (312), the high permeability plate (313), and the shielding plate (314); The shielding plate (314) covers the orthographic projection of the inductor coil (312) and the high permeability plate (313); The high permeability plate (313) affects the equivalent electrical parameters of the transmitting coil (31) and the receiving coil (41): When the receiving coil (41) moves horizontally relative to the transmitting coil (31), the equivalent self-inductance of both the transmitting coil (31) and the receiving coil (41) will change. When the receiving coil (41) and the transmitting coil (31) are in a directly opposite position, the equivalent self-inductance of the receiving coil (41) and the transmitting coil (31) is at its maximum. When the offset of the receiving coil (41) relative to the transmitting coil (31) is greater than a certain threshold, the equivalent self-inductance of the receiving coil (41) and the transmitting coil (31) will decrease rapidly. When the receiving coil (41) and the transmitting coil (31) are in a directly opposite position, the equivalent mutual inductance between the receiving coil (41) and the transmitting coil (31) is at its maximum. When the receiving coil (41) is offset relative to the transmitting coil (31), the equivalent mutual inductance will decrease continuously as the offset distance increases.

2. The self-pickup dynamic wireless charging system according to claim 1, characterized in that: The power supply includes a source-end conversion circuit (2), an AC power supply (1) or a DC power supply. The source-end conversion circuit (2) is electrically connected to the AC power supply (1) or the DC power supply. The source-end conversion circuit (2) converts AC power or DC power into high-frequency AC power.

3. The self-pickup dynamic wireless charging system according to claim 1, characterized in that: The load includes a load-side conversion circuit (5) and a vehicle load (6). The load-side conversion circuit (5) is electrically connected to the vehicle load (6). The load-side conversion circuit (5) converts the high-frequency AC power output by the receiving coil (41) into electrical energy suitable for the load to consume.

4. The self-pickup dynamic wireless charging system according to claim 1, characterized in that: The forward plate of the transmitting coil (31) is positioned close to the forward plate of the receiving coil (41), and the backward plate of the transmitting coil (31) is positioned away from the backward plate of the receiving coil (41).

5. The self-pickup dynamic wireless charging system according to claim 1, characterized in that: The transmitting compensation circuit (32) and the transmitting coil (31) constitute a resonant circuit, and the equivalent self-inductance of the transmitting coil (31) is one of the inductors in the resonant topology; The receiving compensation circuit (42) and the receiving coil (41) constitute a resonant circuit, and the equivalent self-inductance of the receiving coil (41) is one of the inductors in the resonant topology.

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